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diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-customization.xsl b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-customization.xsl deleted file mode 100644 index 5985ea783..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-customization.xsl +++ /dev/null @@ -1,29 +0,0 @@ -<?xml version='1.0'?> -<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0"> - - <xsl:import href="http://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-xsl-1.76.1/xhtml/docbook.xsl" /> - -<!-- - - <xsl:import href="../template/1.76.1/docbook-xsl-1.76.1/xhtml/docbook.xsl" /> - - <xsl:import href="http://docbook.sourceforge.net/release/xsl/1.76.1/xhtml/docbook.xsl" /> - ---> - - <xsl:include href="../template/permalinks.xsl"/> - <xsl:include href="../template/section.title.xsl"/> - <xsl:include href="../template/component.title.xsl"/> - <xsl:include href="../template/division.title.xsl"/> - <xsl:include href="../template/formal.object.heading.xsl"/> - <xsl:include href="../template/gloss-permalinks.xsl"/> - - <xsl:param name="html.stylesheet" select="'user-manual-style.css'" /> - <xsl:param name="chapter.autolabel" select="1" /> - <xsl:param name="section.autolabel" select="1" /> - <xsl:param name="section.label.includes.component.label" select="1" /> - <xsl:param name="appendix.autolabel">A</xsl:param> - -<!-- <xsl:param name="generate.toc" select="'article nop'"></xsl:param> --> - -</xsl:stylesheet> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml deleted file mode 100644 index b1b72e0aa..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml +++ /dev/null @@ -1,931 +0,0 @@ -<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" -"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<chapter id="bitbake-user-manual-execution"> - <title>Execution</title> - - <para> - The primary purpose for running BitBake is to produce some kind - of output such as a single installable package, a kernel, a software - development kit, or even a full, board-specific bootable Linux image, - complete with bootloader, kernel, and root filesystem. - Of course, you can execute the <filename>bitbake</filename> - command with options that cause it to execute single tasks, - compile single recipe files, capture or clear data, or simply - return information about the execution environment. - </para> - - <para> - This chapter describes BitBake's execution process from start - to finish when you use it to create an image. - The execution process is launched using the following command - form: - <literallayout class='monospaced'> - $ bitbake <replaceable>target</replaceable> - </literallayout> - For information on the BitBake command and its options, - see - "<link linkend='bitbake-user-manual-command'>The BitBake Command</link>" - section. - <note> - <para> - Prior to executing BitBake, you should take advantage of available - parallel thread execution on your build host by setting the - <link linkend='var-BB_NUMBER_THREADS'><filename>BB_NUMBER_THREADS</filename></link> - variable in your project's <filename>local.conf</filename> - configuration file. - </para> - - <para> - A common method to determine this value for your build host is to run - the following: - <literallayout class='monospaced'> - $ grep processor /proc/cpuinfo - </literallayout> - This command returns the number of processors, which takes into - account hyper-threading. - Thus, a quad-core build host with hyper-threading most likely - shows eight processors, which is the value you would then assign to - <filename>BB_NUMBER_THREADS</filename>. - </para> - - <para> - A possibly simpler solution is that some Linux distributions - (e.g. Debian and Ubuntu) provide the <filename>ncpus</filename> command. - </para> - </note> - </para> - - <section id='parsing-the-base-configuration-metadata'> - <title>Parsing the Base Configuration Metadata</title> - - <para> - The first thing BitBake does is parse base configuration - metadata. - Base configuration metadata consists of your project's - <filename>bblayers.conf</filename> file to determine what - layers BitBake needs to recognize, all necessary - <filename>layer.conf</filename> files (one from each layer), - and <filename>bitbake.conf</filename>. - The data itself is of various types: - <itemizedlist> - <listitem><para><emphasis>Recipes:</emphasis> - Details about particular pieces of software. - </para></listitem> - <listitem><para><emphasis>Class Data:</emphasis> - An abstraction of common build information - (e.g. how to build a Linux kernel). - </para></listitem> - <listitem><para><emphasis>Configuration Data:</emphasis> - Machine-specific settings, policy decisions, - and so forth. - Configuration data acts as the glue to bind everything - together.</para></listitem> - </itemizedlist> - </para> - - <para> - The <filename>layer.conf</filename> files are used to - construct key variables such as - <link linkend='var-BBPATH'><filename>BBPATH</filename></link> - and - <link linkend='var-BBFILES'><filename>BBFILES</filename></link>. - <filename>BBPATH</filename> is used to search for - configuration and class files under the - <filename>conf</filename> and <filename>classes</filename> - directories, respectively. - <filename>BBFILES</filename> is used to locate both recipe - and recipe append files - (<filename>.bb</filename> and <filename>.bbappend</filename>). - If there is no <filename>bblayers.conf</filename> file, - it is assumed the user has set the <filename>BBPATH</filename> - and <filename>BBFILES</filename> directly in the environment. - </para> - - <para> - Next, the <filename>bitbake.conf</filename> file is located - using the <filename>BBPATH</filename> variable that was - just constructed. - The <filename>bitbake.conf</filename> file may also include other - configuration files using the - <filename>include</filename> or - <filename>require</filename> directives. - </para> - - <para> - Prior to parsing configuration files, Bitbake looks - at certain variables, including: - <itemizedlist> - <listitem><para> - <link linkend='var-BB_ENV_WHITELIST'><filename>BB_ENV_WHITELIST</filename></link> - </para></listitem> - <listitem><para> - <link linkend='var-BB_ENV_EXTRAWHITE'><filename>BB_ENV_EXTRAWHITE</filename></link> - </para></listitem> - <listitem><para> - <link linkend='var-BB_PRESERVE_ENV'><filename>BB_PRESERVE_ENV</filename></link> - </para></listitem> - <listitem><para> - <link linkend='var-BB_ORIGENV'><filename>BB_ORIGENV</filename></link> - </para></listitem> - <listitem><para> - <link linkend='var-BITBAKE_UI'><filename>BITBAKE_UI</filename></link> - </para></listitem> - </itemizedlist> - The first four variables in this list relate to how BitBake treats shell - environment variables during task execution. - By default, BitBake cleans the environment variables and provides tight - control over the shell execution environment. - However, through the use of these first four variables, you can - apply your control regarding the - environment variables allowed to be used by BitBake in the shell - during execution of tasks. - See the - "<link linkend='passing-information-into-the-build-task-environment'>Passing Information Into the Build Task Environment</link>" - section and the information about these variables in the - variable glossary for more information on how they work and - on how to use them. - </para> - - <para> - The base configuration metadata is global - and therefore affects all recipes and tasks that are executed. - </para> - - <para> - BitBake first searches the current working directory for an - optional <filename>conf/bblayers.conf</filename> configuration file. - This file is expected to contain a - <link linkend='var-BBLAYERS'><filename>BBLAYERS</filename></link> - variable that is a space-delimited list of 'layer' directories. - Recall that if BitBake cannot find a <filename>bblayers.conf</filename> - file, then it is assumed the user has set the <filename>BBPATH</filename> - and <filename>BBFILES</filename> variables directly in the environment. - </para> - - <para> - For each directory (layer) in this list, a <filename>conf/layer.conf</filename> - file is located and parsed with the - <link linkend='var-LAYERDIR'><filename>LAYERDIR</filename></link> - variable being set to the directory where the layer was found. - The idea is these files automatically set up - <link linkend='var-BBPATH'><filename>BBPATH</filename></link> - and other variables correctly for a given build directory. - </para> - - <para> - BitBake then expects to find the <filename>conf/bitbake.conf</filename> - file somewhere in the user-specified <filename>BBPATH</filename>. - That configuration file generally has include directives to pull - in any other metadata such as files specific to the architecture, - the machine, the local environment, and so forth. - </para> - - <para> - Only variable definitions and include directives are allowed - in BitBake <filename>.conf</filename> files. - Some variables directly influence BitBake's behavior. - These variables might have been set from the environment - depending on the environment variables previously - mentioned or set in the configuration files. - The - "<link linkend='ref-variables-glos'>Variables Glossary</link>" - chapter presents a full list of variables. - </para> - - <para> - After parsing configuration files, BitBake uses its rudimentary - inheritance mechanism, which is through class files, to inherit - some standard classes. - BitBake parses a class when the inherit directive responsible - for getting that class is encountered. - </para> - - <para> - The <filename>base.bbclass</filename> file is always included. - Other classes that are specified in the configuration using the - <link linkend='var-INHERIT'><filename>INHERIT</filename></link> - variable are also included. - BitBake searches for class files in a - <filename>classes</filename> subdirectory under - the paths in <filename>BBPATH</filename> in the same way as - configuration files. - </para> - - <para> - A good way to get an idea of the configuration files and - the class files used in your execution environment is to - run the following BitBake command: - <literallayout class='monospaced'> - $ bitbake -e > mybb.log - </literallayout> - Examining the top of the <filename>mybb.log</filename> - shows you the many configuration files and class files - used in your execution environment. - </para> - - <note> - <para> - You need to be aware of how BitBake parses curly braces. - If a recipe uses a closing curly brace within the function and - the character has no leading spaces, BitBake produces a parsing - error. - If you use a pair of curly braces in a shell function, the - closing curly brace must not be located at the start of the line - without leading spaces. - </para> - - <para> - Here is an example that causes BitBake to produce a parsing - error: - <literallayout class='monospaced'> - fakeroot create_shar() { - cat << "EOF" > ${SDK_DEPLOY}/${TOOLCHAIN_OUTPUTNAME}.sh - usage() - { - echo "test" - ###### The following "}" at the start of the line causes a parsing error ###### - } - EOF - } - </literallayout> - Writing the recipe this way avoids the error: - <literallayout class='monospaced'> - fakeroot create_shar() { - cat << "EOF" > ${SDK_DEPLOY}/${TOOLCHAIN_OUTPUTNAME}.sh - usage() - { - echo "test" - ######The following "}" with a leading space at the start of the line avoids the error ###### - } - EOF - } - </literallayout> - </para> - </note> - </section> - - <section id='locating-and-parsing-recipes'> - <title>Locating and Parsing Recipes</title> - - <para> - During the configuration phase, BitBake will have set - <link linkend='var-BBFILES'><filename>BBFILES</filename></link>. - BitBake now uses it to construct a list of recipes to parse, - along with any append files (<filename>.bbappend</filename>) - to apply. - <filename>BBFILES</filename> is a space-separated list of - available files and supports wildcards. - An example would be: - <literallayout class='monospaced'> - BBFILES = "/path/to/bbfiles/*.bb /path/to/appends/*.bbappend" - </literallayout> - BitBake parses each recipe and append file located - with <filename>BBFILES</filename> and stores the values of - various variables into the datastore. - <note> - Append files are applied in the order they are encountered in - <filename>BBFILES</filename>. - </note> - For each file, a fresh copy of the base configuration is - made, then the recipe is parsed line by line. - Any inherit statements cause BitBake to find and - then parse class files (<filename>.bbclass</filename>) - using - <link linkend='var-BBPATH'><filename>BBPATH</filename></link> - as the search path. - Finally, BitBake parses in order any append files found in - <filename>BBFILES</filename>. - </para> - - <para> - One common convention is to use the recipe filename to define - pieces of metadata. - For example, in <filename>bitbake.conf</filename> the recipe - name and version are used to set the variables - <link linkend='var-PN'><filename>PN</filename></link> and - <link linkend='var-PV'><filename>PV</filename></link>: - <literallayout class='monospaced'> - PN = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[0] or 'defaultpkgname'}" - PV = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[1] or '1.0'}" - </literallayout> - In this example, a recipe called "something_1.2.3.bb" would set - <filename>PN</filename> to "something" and - <filename>PV</filename> to "1.2.3". - </para> - - <para> - By the time parsing is complete for a recipe, BitBake - has a list of tasks that the recipe defines and a set of - data consisting of keys and values as well as - dependency information about the tasks. - </para> - - <para> - BitBake does not need all of this information. - It only needs a small subset of the information to make - decisions about the recipe. - Consequently, BitBake caches the values in which it is - interested and does not store the rest of the information. - Experience has shown it is faster to re-parse the metadata than to - try and write it out to the disk and then reload it. - </para> - - <para> - Where possible, subsequent BitBake commands reuse this cache of - recipe information. - The validity of this cache is determined by first computing a - checksum of the base configuration data (see - <link linkend='var-BB_HASHCONFIG_WHITELIST'><filename>BB_HASHCONFIG_WHITELIST</filename></link>) - and then checking if the checksum matches. - If that checksum matches what is in the cache and the recipe - and class files have not changed, Bitbake is able to use - the cache. - BitBake then reloads the cached information about the recipe - instead of reparsing it from scratch. - </para> - - <para> - Recipe file collections exist to allow the user to - have multiple repositories of - <filename>.bb</filename> files that contain the same - exact package. - For example, one could easily use them to make one's - own local copy of an upstream repository, but with - custom modifications that one does not want upstream. - Here is an example: - <literallayout class='monospaced'> - BBFILES = "/stuff/openembedded/*/*.bb /stuff/openembedded.modified/*/*.bb" - BBFILE_COLLECTIONS = "upstream local" - BBFILE_PATTERN_upstream = "^/stuff/openembedded/" - BBFILE_PATTERN_local = "^/stuff/openembedded.modified/" - BBFILE_PRIORITY_upstream = "5" - BBFILE_PRIORITY_local = "10" - </literallayout> - <note> - The layers mechanism is now the preferred method of collecting - code. - While the collections code remains, its main use is to set layer - priorities and to deal with overlap (conflicts) between layers. - </note> - </para> - </section> - - <section id='bb-bitbake-providers'> - <title>Providers</title> - - <para> - Assuming BitBake has been instructed to execute a target - and that all the recipe files have been parsed, BitBake - starts to figure out how to build the target. - BitBake looks through the <filename>PROVIDES</filename> list - for each of the recipes. - A <filename>PROVIDES</filename> list is the list of names by which - the recipe can be known. - Each recipe's <filename>PROVIDES</filename> list is created - implicitly through the recipe's - <link linkend='var-PN'><filename>PN</filename></link> variable - and explicitly through the recipe's - <link linkend='var-PROVIDES'><filename>PROVIDES</filename></link> - variable, which is optional. - </para> - - <para> - When a recipe uses <filename>PROVIDES</filename>, that recipe's - functionality can be found under an alternative name or names other - than the implicit <filename>PN</filename> name. - As an example, suppose a recipe named <filename>keyboard_1.0.bb</filename> - contained the following: - <literallayout class='monospaced'> - PROVIDES += "fullkeyboard" - </literallayout> - The <filename>PROVIDES</filename> list for this recipe becomes - "keyboard", which is implicit, and "fullkeyboard", which is explicit. - Consequently, the functionality found in - <filename>keyboard_1.0.bb</filename> can be found under two - different names. - </para> - </section> - - <section id='bb-bitbake-preferences'> - <title>Preferences</title> - - <para> - The <filename>PROVIDES</filename> list is only part of the solution - for figuring out a target's recipes. - Because targets might have multiple providers, BitBake needs - to prioritize providers by determining provider preferences. - </para> - - <para> - A common example in which a target has multiple providers - is "virtual/kernel", which is on the - <filename>PROVIDES</filename> list for each kernel recipe. - Each machine often selects the best kernel provider by using a - line similar to the following in the machine configuration file: - <literallayout class='monospaced'> - PREFERRED_PROVIDER_virtual/kernel = "linux-yocto" - </literallayout> - The default - <link linkend='var-PREFERRED_PROVIDER'><filename>PREFERRED_PROVIDER</filename></link> - is the provider with the same name as the target. - Bitbake iterates through each target it needs to build and - resolves them and their dependencies using this process. - </para> - - <para> - Understanding how providers are chosen is made complicated by the fact - that multiple versions might exist for a given provider. - BitBake defaults to the highest version of a provider. - Version comparisons are made using the same method as Debian. - You can use the - <link linkend='var-PREFERRED_VERSION'><filename>PREFERRED_VERSION</filename></link> - variable to specify a particular version. - You can influence the order by using the - <link linkend='var-DEFAULT_PREFERENCE'><filename>DEFAULT_PREFERENCE</filename></link> - variable. - </para> - - <para> - By default, files have a preference of "0". - Setting <filename>DEFAULT_PREFERENCE</filename> to "-1" makes the - recipe unlikely to be used unless it is explicitly referenced. - Setting <filename>DEFAULT_PREFERENCE</filename> to "1" makes it - likely the recipe is used. - <filename>PREFERRED_VERSION</filename> overrides any - <filename>DEFAULT_PREFERENCE</filename> setting. - <filename>DEFAULT_PREFERENCE</filename> is often used to mark newer - and more experimental recipe versions until they have undergone - sufficient testing to be considered stable. - </para> - - <para> - When there are multiple “versions” of a given recipe, - BitBake defaults to selecting the most recent - version, unless otherwise specified. - If the recipe in question has a - <link linkend='var-DEFAULT_PREFERENCE'><filename>DEFAULT_PREFERENCE</filename></link> - set lower than the other recipes (default is 0), then - it will not be selected. - This allows the person or persons maintaining - the repository of recipe files to specify - their preference for the default selected version. - Additionally, the user can specify their preferred version. - </para> - - <para> - If the first recipe is named <filename>a_1.1.bb</filename>, then the - <link linkend='var-PN'><filename>PN</filename></link> variable - will be set to “a”, and the - <link linkend='var-PV'><filename>PV</filename></link> - variable will be set to 1.1. - </para> - - <para> - Thus, if a recipe named <filename>a_1.2.bb</filename> exists, BitBake - will choose 1.2 by default. - However, if you define the following variable in a - <filename>.conf</filename> file that BitBake parses, you - can change that preference: - <literallayout class='monospaced'> - PREFERRED_VERSION_a = "1.1" - </literallayout> - </para> - - <note> - <para> - It is common for a recipe to provide two versions -- a stable, - numbered (and preferred) version, and a version that is - automatically checked out from a source code repository that - is considered more "bleeding edge" but can be selected only - explicitly. - </para> - - <para> - For example, in the OpenEmbedded codebase, there is a standard, - versioned recipe file for BusyBox, - <filename>busybox_1.22.1.bb</filename>, - but there is also a Git-based version, - <filename>busybox_git.bb</filename>, which explicitly contains the line - <literallayout class='monospaced'> - DEFAULT_PREFERENCE = "-1" - </literallayout> - to ensure that the numbered, stable version is always preferred - unless the developer selects otherwise. - </para> - </note> - </section> - - <section id='bb-bitbake-dependencies'> - <title>Dependencies</title> - - <para> - Each target BitBake builds consists of multiple tasks such as - <filename>fetch</filename>, <filename>unpack</filename>, - <filename>patch</filename>, <filename>configure</filename>, - and <filename>compile</filename>. - For best performance on multi-core systems, BitBake considers each - task as an independent - entity with its own set of dependencies. - </para> - - <para> - Dependencies are defined through several variables. - You can find information about variables BitBake uses in - the <link linkend='ref-variables-glos'>Variables Glossary</link> - near the end of this manual. - At a basic level, it is sufficient to know that BitBake uses the - <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link> and - <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> variables when - calculating dependencies. - </para> - - <para> - For more information on how BitBake handles dependencies, see the - "<link linkend='dependencies'>Dependencies</link>" section. - </para> - </section> - - <section id='ref-bitbake-tasklist'> - <title>The Task List</title> - - <para> - Based on the generated list of providers and the dependency information, - BitBake can now calculate exactly what tasks it needs to run and in what - order it needs to run them. - The - "<link linkend='executing-tasks'>Executing Tasks</link>" section has more - information on how BitBake chooses which task to execute next. - </para> - - <para> - The build now starts with BitBake forking off threads up to the limit set in the - <link linkend='var-BB_NUMBER_THREADS'><filename>BB_NUMBER_THREADS</filename></link> - variable. - BitBake continues to fork threads as long as there are tasks ready to run, - those tasks have all their dependencies met, and the thread threshold has not been - exceeded. - </para> - - <para> - It is worth noting that you can greatly speed up the build time by properly setting - the <filename>BB_NUMBER_THREADS</filename> variable. - </para> - - <para> - As each task completes, a timestamp is written to the directory specified by the - <link linkend='var-STAMP'><filename>STAMP</filename></link> variable. - On subsequent runs, BitBake looks in the build directory within - <filename>tmp/stamps</filename> and does not rerun - tasks that are already completed unless a timestamp is found to be invalid. - Currently, invalid timestamps are only considered on a per - recipe file basis. - So, for example, if the configure stamp has a timestamp greater than the - compile timestamp for a given target, then the compile task would rerun. - Running the compile task again, however, has no effect on other providers - that depend on that target. - </para> - - <para> - The exact format of the stamps is partly configurable. - In modern versions of BitBake, a hash is appended to the - stamp so that if the configuration changes, the stamp becomes - invalid and the task is automatically rerun. - This hash, or signature used, is governed by the signature policy - that is configured (see the - "<link linkend='checksums'>Checksums (Signatures)</link>" - section for information). - It is also possible to append extra metadata to the stamp using - the "stamp-extra-info" task flag. - For example, OpenEmbedded uses this flag to make some tasks machine-specific. - </para> - - <note> - Some tasks are marked as "nostamp" tasks. - No timestamp file is created when these tasks are run. - Consequently, "nostamp" tasks are always rerun. - </note> - - <para> - For more information on tasks, see the - "<link linkend='tasks'>Tasks</link>" section. - </para> - </section> - - <section id='executing-tasks'> - <title>Executing Tasks</title> - - <para> - Tasks can be either a shell task or a Python task. - For shell tasks, BitBake writes a shell script to - <filename>${</filename><link linkend='var-T'><filename>T</filename></link><filename>}/run.do_taskname.pid</filename> - and then executes the script. - The generated shell script contains all the exported variables, - and the shell functions with all variables expanded. - Output from the shell script goes to the file - <filename>${T}/log.do_taskname.pid</filename>. - Looking at the expanded shell functions in the run file and - the output in the log files is a useful debugging technique. - </para> - - <para> - For Python tasks, BitBake executes the task internally and logs - information to the controlling terminal. - Future versions of BitBake will write the functions to files - similar to the way shell tasks are handled. - Logging will be handled in a way similar to shell tasks as well. - </para> - - <para> - The order in which BitBake runs the tasks is controlled by its - task scheduler. - It is possible to configure the scheduler and define custom - implementations for specific use cases. - For more information, see these variables that control the - behavior: - <itemizedlist> - <listitem><para> - <link linkend='var-BB_SCHEDULER'><filename>BB_SCHEDULER</filename></link> - </para></listitem> - <listitem><para> - <link linkend='var-BB_SCHEDULERS'><filename>BB_SCHEDULERS</filename></link> - </para></listitem> - </itemizedlist> - It is possible to have functions run before and after a task's main - function. - This is done using the "prefuncs" and "postfuncs" flags of the task - that lists the functions to run. - </para> - </section> - - <section id='checksums'> - <title>Checksums (Signatures)</title> - - <para> - A checksum is a unique signature of a task's inputs. - The signature of a task can be used to determine if a task - needs to be run. - Because it is a change in a task's inputs that triggers running - the task, BitBake needs to detect all the inputs to a given task. - For shell tasks, this turns out to be fairly easy because - BitBake generates a "run" shell script for each task and - it is possible to create a checksum that gives you a good idea of when - the task's data changes. - </para> - - <para> - To complicate the problem, some things should not be included in - the checksum. - First, there is the actual specific build path of a given task - - the working directory. - It does not matter if the working directory changes because it should not - affect the output for target packages. - The simplistic approach for excluding the working directory is to set - it to some fixed value and create the checksum for the "run" script. - BitBake goes one step better and uses the - <link linkend='var-BB_HASHBASE_WHITELIST'><filename>BB_HASHBASE_WHITELIST</filename></link> - variable to define a list of variables that should never be included - when generating the signatures. - </para> - - <para> - Another problem results from the "run" scripts containing functions that - might or might not get called. - The incremental build solution contains code that figures out dependencies - between shell functions. - This code is used to prune the "run" scripts down to the minimum set, - thereby alleviating this problem and making the "run" scripts much more - readable as a bonus. - </para> - - <para> - So far we have solutions for shell scripts. - What about Python tasks? - The same approach applies even though these tasks are more difficult. - The process needs to figure out what variables a Python function accesses - and what functions it calls. - Again, the incremental build solution contains code that first figures out - the variable and function dependencies, and then creates a checksum for the data - used as the input to the task. - </para> - - <para> - Like the working directory case, situations exist where dependencies - should be ignored. - For these cases, you can instruct the build process to ignore a dependency - by using a line like the following: - <literallayout class='monospaced'> - PACKAGE_ARCHS[vardepsexclude] = "MACHINE" - </literallayout> - This example ensures that the <filename>PACKAGE_ARCHS</filename> variable does not - depend on the value of <filename>MACHINE</filename>, even if it does reference it. - </para> - - <para> - Equally, there are cases where we need to add dependencies BitBake - is not able to find. - You can accomplish this by using a line like the following: - <literallayout class='monospaced'> - PACKAGE_ARCHS[vardeps] = "MACHINE" - </literallayout> - This example explicitly adds the <filename>MACHINE</filename> variable as a - dependency for <filename>PACKAGE_ARCHS</filename>. - </para> - - <para> - Consider a case with in-line Python, for example, where BitBake is not - able to figure out dependencies. - When running in debug mode (i.e. using <filename>-DDD</filename>), BitBake - produces output when it discovers something for which it cannot figure out - dependencies. - </para> - - <para> - Thus far, this section has limited discussion to the direct inputs into a task. - Information based on direct inputs is referred to as the "basehash" in the - code. - However, there is still the question of a task's indirect inputs - the - things that were already built and present in the build directory. - The checksum (or signature) for a particular task needs to add the hashes - of all the tasks on which the particular task depends. - Choosing which dependencies to add is a policy decision. - However, the effect is to generate a master checksum that combines the basehash - and the hashes of the task's dependencies. - </para> - - <para> - At the code level, there are a variety of ways both the basehash and the - dependent task hashes can be influenced. - Within the BitBake configuration file, we can give BitBake some extra information - to help it construct the basehash. - The following statement effectively results in a list of global variable - dependency excludes - variables never included in any checksum. - This example uses variables from OpenEmbedded to help illustrate - the concept: - <literallayout class='monospaced'> - BB_HASHBASE_WHITELIST ?= "TMPDIR FILE PATH PWD BB_TASKHASH BBPATH DL_DIR \ - SSTATE_DIR THISDIR FILESEXTRAPATHS FILE_DIRNAME HOME LOGNAME SHELL TERM \ - USER FILESPATH STAGING_DIR_HOST STAGING_DIR_TARGET COREBASE PRSERV_HOST \ - PRSERV_DUMPDIR PRSERV_DUMPFILE PRSERV_LOCKDOWN PARALLEL_MAKE \ - CCACHE_DIR EXTERNAL_TOOLCHAIN CCACHE CCACHE_DISABLE LICENSE_PATH SDKPKGSUFFIX" - </literallayout> - The previous example excludes the work directory, which is part of - <filename>TMPDIR</filename>. - </para> - - <para> - The rules for deciding which hashes of dependent tasks to include through - dependency chains are more complex and are generally accomplished with a - Python function. - The code in <filename>meta/lib/oe/sstatesig.py</filename> shows two examples - of this and also illustrates how you can insert your own policy into the system - if so desired. - This file defines the two basic signature generators OpenEmbedded Core - uses: "OEBasic" and "OEBasicHash". - By default, there is a dummy "noop" signature handler enabled in BitBake. - This means that behavior is unchanged from previous versions. - <filename>OE-Core</filename> uses the "OEBasicHash" signature handler by default - through this setting in the <filename>bitbake.conf</filename> file: - <literallayout class='monospaced'> - BB_SIGNATURE_HANDLER ?= "OEBasicHash" - </literallayout> - The "OEBasicHash" <filename>BB_SIGNATURE_HANDLER</filename> is the same as the - "OEBasic" version but adds the task hash to the stamp files. - This results in any metadata change that changes the task hash, automatically - causing the task to be run again. - This removes the need to bump - <link linkend='var-PR'><filename>PR</filename></link> - values, and changes to metadata automatically ripple across the build. - </para> - - <para> - It is also worth noting that the end result of these signature generators is to - make some dependency and hash information available to the build. - This information includes: - <itemizedlist> - <listitem><para><filename>BB_BASEHASH_task-</filename><replaceable>taskname</replaceable>: - The base hashes for each task in the recipe. - </para></listitem> - <listitem><para><filename>BB_BASEHASH_</filename><replaceable>filename</replaceable><filename>:</filename><replaceable>taskname</replaceable>: - The base hashes for each dependent task. - </para></listitem> - <listitem><para><filename>BBHASHDEPS_</filename><replaceable>filename</replaceable><filename>:</filename><replaceable>taskname</replaceable>: - The task dependencies for each task. - </para></listitem> - <listitem><para><filename>BB_TASKHASH</filename>: - The hash of the currently running task. - </para></listitem> - </itemizedlist> - </para> - - <para> - It is worth noting that BitBake's "-S" option lets you - debug Bitbake's processing of signatures. - The options passed to -S allow different debugging modes - to be used, either using BitBake's own debug functions - or possibly those defined in the metadata/signature handler - itself. - The simplest parameter to pass is "none", which causes a - set of signature information to be written out into - <filename>STAMP_DIR</filename> - corresponding to the targets specified. - The other currently available parameter is "printdiff", - which causes BitBake to try to establish the closest - signature match it can (e.g. in the sstate cache) and then - run <filename>bitbake-diffsigs</filename> over the matches - to determine the stamps and delta where these two - stamp trees diverge. - <note> - It is likely that future versions of BitBake will - provide other signature handlers triggered through - additional "-S" parameters. - </note> - </para> - - <para> - You can find more information on checksum metadata in the - "<link linkend='task-checksums-and-setscene'>Task Checksums and Setscene</link>" - section. - </para> - </section> - - <section id='setscene'> - <title>Setscene</title> - - <para> - The setscene process enables BitBake to handle "pre-built" artifacts. - The ability to handle and reuse these artifacts allows BitBake - the luxury of not having to build something from scratch every time. - Instead, BitBake can use, when possible, existing build artifacts. - </para> - - <para> - BitBake needs to have reliable data indicating whether or not an - artifact is compatible. - Signatures, described in the previous section, provide an ideal - way of representing whether an artifact is compatible. - If a signature is the same, an object can be reused. - </para> - - <para> - If an object can be reused, the problem then becomes how to - replace a given task or set of tasks with the pre-built artifact. - BitBake solves the problem with the "setscene" process. - </para> - - <para> - When BitBake is asked to build a given target, before building anything, - it first asks whether cached information is available for any of the - targets it's building, or any of the intermediate targets. - If cached information is available, BitBake uses this information instead of - running the main tasks. - </para> - - <para> - BitBake first calls the function defined by the - <link linkend='var-BB_HASHCHECK_FUNCTION'><filename>BB_HASHCHECK_FUNCTION</filename></link> - variable with a list of tasks and corresponding - hashes it wants to build. - This function is designed to be fast and returns a list - of the tasks for which it believes in can obtain artifacts. - </para> - - <para> - Next, for each of the tasks that were returned as possibilities, - BitBake executes a setscene version of the task that the possible - artifact covers. - Setscene versions of a task have the string "_setscene" appended to the - task name. - So, for example, the task with the name <filename>xxx</filename> has - a setscene task named <filename>xxx_setscene</filename>. - The setscene version of the task executes and provides the necessary - artifacts returning either success or failure. - </para> - - <para> - As previously mentioned, an artifact can cover more than one task. - For example, it is pointless to obtain a compiler if you - already have the compiled binary. - To handle this, BitBake calls the - <link linkend='var-BB_SETSCENE_DEPVALID'><filename>BB_SETSCENE_DEPVALID</filename></link> - function for each successful setscene task to know whether or not it needs - to obtain the dependencies of that task. - </para> - - <para> - Finally, after all the setscene tasks have executed, BitBake calls the - function listed in - <link linkend='var-BB_SETSCENE_VERIFY_FUNCTION'><filename>BB_SETSCENE_VERIFY_FUNCTION</filename></link> - with the list of tasks BitBake thinks has been "covered". - The metadata can then ensure that this list is correct and can - inform BitBake that it wants specific tasks to be run regardless - of the setscene result. - </para> - - <para> - You can find more information on setscene metadata in the - "<link linkend='task-checksums-and-setscene'>Task Checksums and Setscene</link>" - section. - </para> - </section> -</chapter> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml deleted file mode 100644 index f168cfa68..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml +++ /dev/null @@ -1,765 +0,0 @@ -<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" -"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<chapter> -<title>File Download Support</title> - - <para> - BitBake's fetch module is a standalone piece of library code - that deals with the intricacies of downloading source code - and files from remote systems. - Fetching source code is one of the cornerstones of building software. - As such, this module forms an important part of BitBake. - </para> - - <para> - The current fetch module is called "fetch2" and refers to the - fact that it is the second major version of the API. - The original version is obsolete and has been removed from the codebase. - Thus, in all cases, "fetch" refers to "fetch2" in this - manual. - </para> - - <section id='the-download-fetch'> - <title>The Download (Fetch)</title> - - <para> - BitBake takes several steps when fetching source code or files. - The fetcher codebase deals with two distinct processes in order: - obtaining the files from somewhere (cached or otherwise) - and then unpacking those files into a specific location and - perhaps in a specific way. - Getting and unpacking the files is often optionally followed - by patching. - Patching, however, is not covered by this module. - </para> - - <para> - The code to execute the first part of this process, a fetch, - looks something like the following: - <literallayout class='monospaced'> - src_uri = (d.getVar('SRC_URI', True) or "").split() - fetcher = bb.fetch2.Fetch(src_uri, d) - fetcher.download() - </literallayout> - This code sets up an instance of the fetch class. - The instance uses a space-separated list of URLs from the - <link linkend='var-SRC_URI'><filename>SRC_URI</filename></link> - variable and then calls the <filename>download</filename> - method to download the files. - </para> - - <para> - The instantiation of the fetch class is usually followed by: - <literallayout class='monospaced'> - rootdir = l.getVar('WORKDIR', True) - fetcher.unpack(rootdir) - </literallayout> - This code unpacks the downloaded files to the - specified by <filename>WORKDIR</filename>. - <note> - For convenience, the naming in these examples matches - the variables used by OpenEmbedded. - If you want to see the above code in action, examine - the OpenEmbedded class file <filename>base.bbclass</filename>. - </note> - The <filename>SRC_URI</filename> and <filename>WORKDIR</filename> - variables are not hardcoded into the fetcher, since those fetcher - methods can be (and are) called with different variable names. - In OpenEmbedded for example, the shared state (sstate) code uses - the fetch module to fetch the sstate files. - </para> - - <para> - When the <filename>download()</filename> method is called, - BitBake tries to resolve the URLs by looking for source files - in a specific search order: - <itemizedlist> - <listitem><para><emphasis>Pre-mirror Sites:</emphasis> - BitBake first uses pre-mirrors to try and find source files. - These locations are defined using the - <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link> - variable. - </para></listitem> - <listitem><para><emphasis>Source URI:</emphasis> - If pre-mirrors fail, BitBake uses the original URL (e.g from - <filename>SRC_URI</filename>). - </para></listitem> - <listitem><para><emphasis>Mirror Sites:</emphasis> - If fetch failures occur, BitBake next uses mirror locations as - defined by the - <link linkend='var-MIRRORS'><filename>MIRRORS</filename></link> - variable. - </para></listitem> - </itemizedlist> - </para> - - <para> - For each URL passed to the fetcher, the fetcher - calls the submodule that handles that particular URL type. - This behavior can be the source of some confusion when you - are providing URLs for the <filename>SRC_URI</filename> - variable. - Consider the following two URLs: - <literallayout class='monospaced'> - http://git.yoctoproject.org/git/poky;protocol=git - git://git.yoctoproject.org/git/poky;protocol=http - </literallayout> - In the former case, the URL is passed to the - <filename>wget</filename> fetcher, which does not - understand "git". - Therefore, the latter case is the correct form since the - Git fetcher does know how to use HTTP as a transport. - </para> - - <para> - Here are some examples that show commonly used mirror - definitions: - <literallayout class='monospaced'> - PREMIRRORS ?= "\ - bzr://.*/.* http://somemirror.org/sources/ \n \ - cvs://.*/.* http://somemirror.org/sources/ \n \ - git://.*/.* http://somemirror.org/sources/ \n \ - hg://.*/.* http://somemirror.org/sources/ \n \ - osc://.*/.* http://somemirror.org/sources/ \n \ - p4://.*/.* http://somemirror.org/sources/ \n \ - svn://.*/.* http://somemirror.org/sources/ \n" - - MIRRORS =+ "\ - ftp://.*/.* http://somemirror.org/sources/ \n \ - http://.*/.* http://somemirror.org/sources/ \n \ - https://.*/.* http://somemirror.org/sources/ \n" - </literallayout> - It is useful to note that BitBake supports - cross-URLs. - It is possible to mirror a Git repository on an HTTP - server as a tarball. - This is what the <filename>git://</filename> mapping in - the previous example does. - </para> - - <para> - Since network accesses are slow, Bitbake maintains a - cache of files downloaded from the network. - Any source files that are not local (i.e. - downloaded from the Internet) are placed into the download - directory, which is specified by the - <link linkend='var-DL_DIR'><filename>DL_DIR</filename></link> - variable. - </para> - - <para> - File integrity is of key importance for reproducing builds. - For non-local archive downloads, the fetcher code can verify - SHA-256 and MD5 checksums to ensure the archives have been - downloaded correctly. - You can specify these checksums by using the - <filename>SRC_URI</filename> variable with the appropriate - varflags as follows: - <literallayout class='monospaced'> - SRC_URI[md5sum] = "<replaceable>value</replaceable>" - SRC_URI[sha256sum] = "<replaceable>value</replaceable>" - </literallayout> - You can also specify the checksums as parameters on the - <filename>SRC_URI</filename> as shown below: - <literallayout class='monospaced'> - SRC_URI = "http://example.com/foobar.tar.bz2;md5sum=4a8e0f237e961fd7785d19d07fdb994d" - </literallayout> - If multiple URIs exist, you can specify the checksums either - directly as in the previous example, or you can name the URLs. - The following syntax shows how you name the URIs: - <literallayout class='monospaced'> - SRC_URI = "http://example.com/foobar.tar.bz2;name=foo" - SRC_URI[foo.md5sum] = 4a8e0f237e961fd7785d19d07fdb994d - </literallayout> - After a file has been downloaded and has had its checksum checked, - a ".done" stamp is placed in <filename>DL_DIR</filename>. - BitBake uses this stamp during subsequent builds to avoid - downloading or comparing a checksum for the file again. - <note> - It is assumed that local storage is safe from data corruption. - If this were not the case, there would be bigger issues to worry about. - </note> - </para> - - <para> - If - <link linkend='var-BB_STRICT_CHECKSUM'><filename>BB_STRICT_CHECKSUM</filename></link> - is set, any download without a checksum triggers an - error message. - The - <link linkend='var-BB_NO_NETWORK'><filename>BB_NO_NETWORK</filename></link> - variable can be used to make any attempted network access a fatal - error, which is useful for checking that mirrors are complete - as well as other things. - </para> - </section> - - <section id='bb-the-unpack'> - <title>The Unpack</title> - - <para> - The unpack process usually immediately follows the download. - For all URLs except Git URLs, BitBake uses the common - <filename>unpack</filename> method. - </para> - - <para> - A number of parameters exist that you can specify within the - URL to govern the behavior of the unpack stage: - <itemizedlist> - <listitem><para><emphasis>unpack:</emphasis> - Controls whether the URL components are unpacked. - If set to "1", which is the default, the components - are unpacked. - If set to "0", the unpack stage leaves the file alone. - This parameter is useful when you want an archive to be - copied in and not be unpacked. - </para></listitem> - <listitem><para><emphasis>dos:</emphasis> - Applies to <filename>.zip</filename> and - <filename>.jar</filename> files and specifies whether to - use DOS line ending conversion on text files. - </para></listitem> - <listitem><para><emphasis>basepath:</emphasis> - Instructs the unpack stage to strip the specified - directories from the source path when unpacking. - </para></listitem> - <listitem><para><emphasis>subdir:</emphasis> - Unpacks the specific URL to the specified subdirectory - within the root directory. - </para></listitem> - </itemizedlist> - The unpack call automatically decompresses and extracts files - with ".Z", ".z", ".gz", ".xz", ".zip", ".jar", ".ipk", ".rpm". - ".srpm", ".deb" and ".bz2" extensions as well as various combinations - of tarball extensions. - </para> - - <para> - As mentioned, the Git fetcher has its own unpack method that - is optimized to work with Git trees. - Basically, this method works by cloning the tree into the final - directory. - The process is completed using references so that there is - only one central copy of the Git metadata needed. - </para> - </section> - - <section id='bb-fetchers'> - <title>Fetchers</title> - - <para> - As mentioned earlier, the URL prefix determines which - fetcher submodule BitBake uses. - Each submodule can support different URL parameters, - which are described in the following sections. - </para> - - <section id='local-file-fetcher'> - <title>Local file fetcher (<filename>file://</filename>)</title> - - <para> - This submodule handles URLs that begin with - <filename>file://</filename>. - The filename you specify within the URL can be - either an absolute or relative path to a file. - If the filename is relative, the contents of the - <link linkend='var-FILESPATH'><filename>FILESPATH</filename></link> - variable is used in the same way - <filename>PATH</filename> is used to find executables. - Failing that, - <link linkend='var-FILESDIR'><filename>FILESDIR</filename></link> - is used to find the appropriate relative file. - <note> - <filename>FILESDIR</filename> is deprecated and can - be replaced with <filename>FILESPATH</filename>. - Because <filename>FILESDIR</filename> is likely to be - removed, you should not use this variable in any new code. - </note> - If the file cannot be found, it is assumed that it is available in - <link linkend='var-DL_DIR'><filename>DL_DIR</filename></link> - by the time the <filename>download()</filename> method is called. - </para> - - <para> - If you specify a directory, the entire directory is - unpacked. - </para> - - <para> - Here are a couple of example URLs, the first relative and - the second absolute: - <literallayout class='monospaced'> - SRC_URI = "file://relativefile.patch" - SRC_URI = "file:///Users/ich/very_important_software" - </literallayout> - </para> - </section> - - <section id='http-ftp-fetcher'> - <title>HTTP/FTP wget fetcher (<filename>http://</filename>, <filename>ftp://</filename>, <filename>https://</filename>)</title> - - <para> - This fetcher obtains files from web and FTP servers. - Internally, the fetcher uses the wget utility. - </para> - - <para> - The executable and parameters used are specified by the - <filename>FETCHCMD_wget</filename> variable, which defaults - to sensible values. - The fetcher supports a parameter "downloadfilename" that - allows the name of the downloaded file to be specified. - Specifying the name of the downloaded file is useful - for avoiding collisions in - <link linkend='var-DL_DIR'><filename>DL_DIR</filename></link> - when dealing with multiple files that have the same name. - </para> - - <para> - Some example URLs are as follows: - <literallayout class='monospaced'> - SRC_URI = "http://oe.handhelds.org/not_there.aac" - SRC_URI = "ftp://oe.handhelds.org/not_there_as_well.aac" - SRC_URI = "ftp://you@oe.handhelds.org/home/you/secret.plan" - </literallayout> - </para> - <note> - Because URL parameters are delimited by semi-colons, this can - introduce ambiguity when parsing URLs that also contain semi-colons, - for example: - <literallayout class='monospaced'> - SRC_URI = "http://abc123.org/git/?p=gcc/gcc.git;a=snapshot;h=a5dd47" - </literallayout> - Such URLs should should be modified by replacing semi-colons with '&' characters: - <literallayout class='monospaced'> - SRC_URI = "http://abc123.org/git/?p=gcc/gcc.git&a=snapshot&h=a5dd47" - </literallayout> - In most cases this should work. Treating semi-colons and '&' in queries - identically is recommended by the World Wide Web Consortium (W3C). - Note that due to the nature of the URL, you may have to specify the name - of the downloaded file as well: - <literallayout class='monospaced'> - SRC_URI = "http://abc123.org/git/?p=gcc/gcc.git&a=snapshot&h=a5dd47;downloadfilename=myfile.bz2" - </literallayout> - </note> - </section> - - <section id='cvs-fetcher'> - <title>CVS fetcher (<filename>(cvs://</filename>)</title> - - <para> - This submodule handles checking out files from the - CVS version control system. - You can configure it using a number of different variables: - <itemizedlist> - <listitem><para><emphasis><filename>FETCHCMD_cvs</filename>:</emphasis> - The name of the executable to use when running - the <filename>cvs</filename> command. - This name is usually "cvs". - </para></listitem> - <listitem><para><emphasis><filename>SRCDATE</filename>:</emphasis> - The date to use when fetching the CVS source code. - A special value of "now" causes the checkout to - be updated on every build. - </para></listitem> - <listitem><para><emphasis><link linkend='var-CVSDIR'><filename>CVSDIR</filename></link>:</emphasis> - Specifies where a temporary checkout is saved. - The location is often <filename>DL_DIR/cvs</filename>. - </para></listitem> - <listitem><para><emphasis><filename>CVS_PROXY_HOST</filename>:</emphasis> - The name to use as a "proxy=" parameter to the - <filename>cvs</filename> command. - </para></listitem> - <listitem><para><emphasis><filename>CVS_PROXY_PORT</filename>:</emphasis> - The port number to use as a "proxyport=" parameter to - the <filename>cvs</filename> command. - </para></listitem> - </itemizedlist> - As well as the standard username and password URL syntax, - you can also configure the fetcher with various URL parameters: - </para> - - <para> - The supported parameters are as follows: - <itemizedlist> - <listitem><para><emphasis>"method":</emphasis> - The protocol over which to communicate with the CVS server. - By default, this protocol is "pserver". - If "method" is set to "ext", BitBake examines the - "rsh" parameter and sets <filename>CVS_RSH</filename>. - You can use "dir" for local directories. - </para></listitem> - <listitem><para><emphasis>"module":</emphasis> - Specifies the module to check out. - You must supply this parameter. - </para></listitem> - <listitem><para><emphasis>"tag":</emphasis> - Describes which CVS TAG should be used for - the checkout. - By default, the TAG is empty. - </para></listitem> - <listitem><para><emphasis>"date":</emphasis> - Specifies a date. - If no "date" is specified, the - <link linkend='var-SRCDATE'><filename>SRCDATE</filename></link> - of the configuration is used to checkout a specific date. - The special value of "now" causes the checkout to be - updated on every build. - </para></listitem> - <listitem><para><emphasis>"localdir":</emphasis> - Used to rename the module. - Effectively, you are renaming the output directory - to which the module is unpacked. - You are forcing the module into a special - directory relative to - <link linkend='var-CVSDIR'><filename>CVSDIR</filename></link>. - </para></listitem> - <listitem><para><emphasis>"rsh"</emphasis> - Used in conjunction with the "method" parameter. - </para></listitem> - <listitem><para><emphasis>"scmdata":</emphasis> - Causes the CVS metadata to be maintained in the tarball - the fetcher creates when set to "keep". - The tarball is expanded into the work directory. - By default, the CVS metadata is removed. - </para></listitem> - <listitem><para><emphasis>"fullpath":</emphasis> - Controls whether the resulting checkout is at the - module level, which is the default, or is at deeper - paths. - </para></listitem> - <listitem><para><emphasis>"norecurse":</emphasis> - Causes the fetcher to only checkout the specified - directory with no recurse into any subdirectories. - </para></listitem> - <listitem><para><emphasis>"port":</emphasis> - The port to which the CVS server connects. - </para></listitem> - </itemizedlist> - Some example URLs are as follows: - <literallayout class='monospaced'> - SRC_URI = "cvs://CVSROOT;module=mymodule;tag=some-version;method=ext" - SRC_URI = "cvs://CVSROOT;module=mymodule;date=20060126;localdir=usethat" - </literallayout> - </para> - </section> - - <section id='svn-fetcher'> - <title>Subversion (SVN) Fetcher (<filename>svn://</filename>)</title> - - <para> - This fetcher submodule fetches code from the - Subversion source control system. - The executable used is specified by - <filename>FETCHCMD_svn</filename>, which defaults - to "svn". - The fetcher's temporary working directory is set by - <link linkend='var-SVNDIR'><filename>SVNDIR</filename></link>, - which is usually <filename>DL_DIR/svn</filename>. - </para> - - <para> - The supported parameters are as follows: - <itemizedlist> - <listitem><para><emphasis>"module":</emphasis> - The name of the svn module to checkout. - You must provide this parameter. - You can think of this parameter as the top-level - directory of the repository data you want. - </para></listitem> - <listitem><para><emphasis>"protocol":</emphasis> - The protocol to use, which defaults to "svn". - Other options are "svn+ssh" and "rsh". - For "rsh", the "rsh" parameter is also used. - </para></listitem> - <listitem><para><emphasis>"rev":</emphasis> - The revision of the source code to checkout. - </para></listitem> - <listitem><para><emphasis>"date":</emphasis> - The date of the source code to checkout. - Specific revisions are generally much safer to checkout - rather than by date as they do not involve timezones - (e.g. they are much more deterministic). - </para></listitem> - <listitem><para><emphasis>"scmdata":</emphasis> - Causes the “.svn” directories to be available during - compile-time when set to "keep". - By default, these directories are removed. - </para></listitem> - <listitem><para><emphasis>"transportuser":</emphasis> - When required, sets the username for the transport. - By default, this parameter is empty. - The transport username is different than the username - used in the main URL, which is passed to the subversion - command. - </para></listitem> - </itemizedlist> - Following are two examples using svn: - <literallayout class='monospaced'> - SRC_URI = "svn://svn.oe.handhelds.org/svn;module=vip;proto=http;rev=667" - SRC_URI = "svn://svn.oe.handhelds.org/svn/;module=opie;proto=svn+ssh;date=20060126" - </literallayout> - </para> - </section> - - <section id='git-fetcher'> - <title>Git Fetcher (<filename>git://</filename>)</title> - - <para> - This fetcher submodule fetches code from the Git - source control system. - The fetcher works by creating a bare clone of the - remote into - <link linkend='var-GITDIR'><filename>GITDIR</filename></link>, - which is usually <filename>DL_DIR/git2</filename>. - This bare clone is then cloned into the work directory during the - unpack stage when a specific tree is checked out. - This is done using alternates and by reference to - minimize the amount of duplicate data on the disk and - make the unpack process fast. - The executable used can be set with - <filename>FETCHCMD_git</filename>. - </para> - - <para> - This fetcher supports the following parameters: - <itemizedlist> - <listitem><para><emphasis>"protocol":</emphasis> - The protocol used to fetch the files. - The default is "git" when a hostname is set. - If a hostname is not set, the Git protocol is "file". - You can also use "http", "https", "ssh" and "rsync". - </para></listitem> - <listitem><para><emphasis>"nocheckout":</emphasis> - Tells the fetcher to not checkout source code when - unpacking when set to "1". - Set this option for the URL where there is a custom - routine to checkout code. - The default is "0". - </para></listitem> - <listitem><para><emphasis>"rebaseable":</emphasis> - Indicates that the upstream Git repository can be rebased. - You should set this parameter to "1" if - revisions can become detached from branches. - In this case, the source mirror tarball is done per - revision, which has a loss of efficiency. - Rebasing the upstream Git repository could cause the - current revision to disappear from the upstream repository. - This option reminds the fetcher to preserve the local cache - carefully for future use. - The default value for this parameter is "0". - </para></listitem> - <listitem><para><emphasis>"nobranch":</emphasis> - Tells the fetcher to not check the SHA validation - for the branch when set to "1". - The default is "0". - Set this option for the recipe that refers to - the commit that is valid for a tag instead of - the branch. - </para></listitem> - <listitem><para><emphasis>"bareclone":</emphasis> - Tells the fetcher to clone a bare clone into the - destination directory without checking out a working tree. - Only the raw Git metadata is provided. - This parameter implies the "nocheckout" parameter as well. - </para></listitem> - <listitem><para><emphasis>"branch":</emphasis> - The branch(es) of the Git tree to clone. - If unset, this is assumed to be "master". - The number of branch parameters much match the number of - name parameters. - </para></listitem> - <listitem><para><emphasis>"rev":</emphasis> - The revision to use for the checkout. - The default is "master". - </para></listitem> - <listitem><para><emphasis>"tag":</emphasis> - Specifies a tag to use for the checkout. - To correctly resolve tags, BitBake must access the - network. - For that reason, tags are often not used. - As far as Git is concerned, the "tag" parameter behaves - effectively the same as the "rev" parameter. - </para></listitem> - <listitem><para><emphasis>"subpath":</emphasis> - Limits the checkout to a specific subpath of the tree. - By default, the whole tree is checked out. - </para></listitem> - <listitem><para><emphasis>"destsuffix":</emphasis> - The name of the path in which to place the checkout. - By default, the path is <filename>git/</filename>. - </para></listitem> - </itemizedlist> - Here are some example URLs: - <literallayout class='monospaced'> - SRC_URI = "git://git.oe.handhelds.org/git/vip.git;tag=version-1" - SRC_URI = "git://git.oe.handhelds.org/git/vip.git;protocol=http" - </literallayout> - </para> - </section> - - <section id='gitsm-fetcher'> - <title>Git Submodule Fetcher (<filename>gitsm://</filename>)</title> - - <para> - This fetcher submodule inherits from the - <link linkend='git-fetcher'>Git fetcher</link> and extends - that fetcher's behavior by fetching a repository's submodules. - <link linkend='var-SRC_URI'><filename>SRC_URI</filename></link> - is passed to the Git fetcher as described in the - "<link linkend='git-fetcher'>Git Fetcher (<filename>git://</filename>)</link>" - section. - <note> - <title>Notes and Warnings</title> - <para> - You must clean a recipe when switching between - '<filename>git://</filename>' and - '<filename>gitsm://</filename>' URLs. - </para> - - <para> - The Git Submodules fetcher is not a complete fetcher - implementation. - The fetcher has known issues where it does not use the - normal source mirroring infrastructure properly. - </para> - </note> - </para> - </section> - - <section id='clearcase-fetcher'> - <title>ClearCase Fetcher (<filename>ccrc://</filename>)</title> - - <para> - This fetcher submodule fetches code from a - <ulink url='http://en.wikipedia.org/wiki/Rational_ClearCase'>ClearCase</ulink> - repository. - </para> - - <para> - To use this fetcher, make sure your recipe has proper - <link linkend='var-SRC_URI'><filename>SRC_URI</filename></link>, - <link linkend='var-SRCREV'><filename>SRCREV</filename></link>, and - <link linkend='var-PV'><filename>PV</filename></link> settings. - Here is an example: - <literallayout class='monospaced'> - SRC_URI = "ccrc://cc.example.org/ccrc;vob=/example_vob;module=/example_module" - SRCREV = "EXAMPLE_CLEARCASE_TAG" - PV = "${@d.getVar("SRCREV", False).replace("/", "+")}" - </literallayout> - The fetcher uses the <filename>rcleartool</filename> or - <filename>cleartool</filename> remote client, depending on - which one is available. - </para> - - <para> - Following are options for the <filename>SRC_URI</filename> - statement: - <itemizedlist> - <listitem><para><emphasis><filename>vob</filename></emphasis>: - The name, which must include the - prepending "/" character, of the ClearCase VOB. - This option is required. - </para></listitem> - <listitem><para><emphasis><filename>module</filename></emphasis>: - The module, which must include the - prepending "/" character, in the selected VOB. - <note> - The <filename>module</filename> and <filename>vob</filename> - options are combined to create the <filename>load</filename> rule in - the view config spec. - As an example, consider the <filename>vob</filename> and - <filename>module</filename> values from the - <filename>SRC_URI</filename> statement at the start of this section. - Combining those values results in the following: - <literallayout class='monospaced'> - load /example_vob/example_module - </literallayout> - </note> - </para></listitem> - <listitem><para><emphasis><filename>proto</filename></emphasis>: - The protocol, which can be either <filename>http</filename> or - <filename>https</filename>. - </para></listitem> - </itemizedlist> - </para> - - <para> - By default, the fetcher creates a configuration specification. - If you want this specification written to an area other than the default, - use the <filename>CCASE_CUSTOM_CONFIG_SPEC</filename> variable - in your recipe to define where the specification is written. - <note> - the <filename>SRCREV</filename> loses its functionality if you - specify this variable. - However, <filename>SRCREV</filename> is still used to label the - archive after a fetch even though it does not define what is - fetched. - </note> - </para> - - <para> - Here are a couple of other behaviors worth mentioning: - <itemizedlist> - <listitem><para> - When using <filename>cleartool</filename>, the login of - <filename>cleartool</filename> is handled by the system. - The login require no special steps. - </para></listitem> - <listitem><para> - In order to use <filename>rcleartool</filename> with authenticated - users, an "rcleartool login" is necessary before using the fetcher. - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id='other-fetchers'> - <title>Other Fetchers</title> - - <para> - Fetch submodules also exist for the following: - <itemizedlist> - <listitem><para> - Bazaar (<filename>bzr://</filename>) - </para></listitem> - <listitem><para> - Perforce (<filename>p4://</filename>) - </para></listitem> - <listitem><para> - Trees using Git Annex (<filename>gitannex://</filename>) - </para></listitem> - <listitem><para> - Secure FTP (<filename>sftp://</filename>) - </para></listitem> - <listitem><para> - Secure Shell (<filename>ssh://</filename>) - </para></listitem> - <listitem><para> - Repo (<filename>repo://</filename>) - </para></listitem> - <listitem><para> - OSC (<filename>osc://</filename>) - </para></listitem> - <listitem><para> - Mercurial (<filename>hg://</filename>) - </para></listitem> - </itemizedlist> - No documentation currently exists for these lesser used - fetcher submodules. - However, you might find the code helpful and readable. - </para> - </section> - </section> - - <section id='auto-revisions'> - <title>Auto Revisions</title> - - <para> - We need to document <filename>AUTOREV</filename> and - <filename>SRCREV_FORMAT</filename> here. - </para> - </section> -</chapter> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-hello.xml b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-hello.xml deleted file mode 100644 index f6d82b4f3..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-hello.xml +++ /dev/null @@ -1,505 +0,0 @@ -<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" -"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<appendix id='hello-world-example'> - <title>Hello World Example</title> - - <section id='bitbake-hello-world'> - <title>BitBake Hello World</title> - - <para> - The simplest example commonly used to demonstrate any new - programming language or tool is the - "<ulink url="http://en.wikipedia.org/wiki/Hello_world_program">Hello World</ulink>" - example. - This appendix demonstrates, in tutorial form, Hello - World within the context of BitBake. - The tutorial describes how to create a new project - and the applicable metadata files necessary to allow - BitBake to build it. - </para> - </section> - - <section id='example-obtaining-bitbake'> - <title>Obtaining BitBake</title> - - <para> - See the - "<link linkend='obtaining-bitbake'>Obtaining BitBake</link>" - section for information on how to obtain BitBake. - Once you have the source code on your machine, the BitBake directory - appears as follows: - <literallayout class='monospaced'> - $ ls -al - total 100 - drwxrwxr-x. 9 wmat wmat 4096 Jan 31 13:44 . - drwxrwxr-x. 3 wmat wmat 4096 Feb 4 10:45 .. - -rw-rw-r--. 1 wmat wmat 365 Nov 26 04:55 AUTHORS - drwxrwxr-x. 2 wmat wmat 4096 Nov 26 04:55 bin - drwxrwxr-x. 4 wmat wmat 4096 Jan 31 13:44 build - -rw-rw-r--. 1 wmat wmat 16501 Nov 26 04:55 ChangeLog - drwxrwxr-x. 2 wmat wmat 4096 Nov 26 04:55 classes - drwxrwxr-x. 2 wmat wmat 4096 Nov 26 04:55 conf - drwxrwxr-x. 3 wmat wmat 4096 Nov 26 04:55 contrib - -rw-rw-r--. 1 wmat wmat 17987 Nov 26 04:55 COPYING - drwxrwxr-x. 3 wmat wmat 4096 Nov 26 04:55 doc - -rw-rw-r--. 1 wmat wmat 69 Nov 26 04:55 .gitignore - -rw-rw-r--. 1 wmat wmat 849 Nov 26 04:55 HEADER - drwxrwxr-x. 5 wmat wmat 4096 Jan 31 13:44 lib - -rw-rw-r--. 1 wmat wmat 195 Nov 26 04:55 MANIFEST.in - -rw-rw-r--. 1 wmat wmat 2887 Nov 26 04:55 TODO - </literallayout> - </para> - - <para> - At this point, you should have BitBake cloned to - a directory that matches the previous listing except for - dates and user names. - </para> - </section> - - <section id='setting-up-the-bitbake-environment'> - <title>Setting Up the BitBake Environment</title> - - <para> - First, you need to be sure that you can run BitBake. - Set your working directory to where your local BitBake - files are and run the following command: - <literallayout class='monospaced'> - $ ./bin/bitbake --version - BitBake Build Tool Core version 1.23.0, bitbake version 1.23.0 - </literallayout> - The console output tells you what version you are running. - </para> - - <para> - The recommended method to run BitBake is from a directory of your - choice. - To be able to run BitBake from any directory, you need to add the - executable binary to your binary to your shell's environment - <filename>PATH</filename> variable. - First, look at your current <filename>PATH</filename> variable - by entering the following: - <literallayout class='monospaced'> - $ echo $PATH - </literallayout> - Next, add the directory location for the BitBake binary to the - <filename>PATH</filename>. - Here is an example that adds the - <filename>/home/scott-lenovo/bitbake/bin</filename> directory - to the front of the <filename>PATH</filename> variable: - <literallayout class='monospaced'> - $ export PATH=/home/scott-lenovo/bitbake/bin:$PATH - </literallayout> - You should now be able to enter the <filename>bitbake</filename> - command from the command line while working from any directory. - </para> - </section> - - <section id='the-hello-world-example'> - <title>The Hello World Example</title> - - <para> - The overall goal of this exercise is to build a - complete "Hello World" example utilizing task and layer - concepts. - Because this is how modern projects such as OpenEmbedded and - the Yocto Project utilize BitBake, the example - provides an excellent starting point for understanding - BitBake. - </para> - - <para> - To help you understand how to use BitBake to build targets, - the example starts with nothing but the <filename>bitbake</filename> - command, which causes BitBake to fail and report problems. - The example progresses by adding pieces to the build to - eventually conclude with a working, minimal "Hello World" - example. - </para> - - <para> - While every attempt is made to explain what is happening during - the example, the descriptions cannot cover everything. - You can find further information throughout this manual. - Also, you can actively participate in the - <ulink url='http://lists.openembedded.org/mailman/listinfo/bitbake-devel'></ulink> - discussion mailing list about the BitBake build tool. - </para> - - <note> - This example was inspired by and drew heavily from these sources: - <itemizedlist> - <listitem><para> - <ulink url="http://www.mail-archive.com/yocto@yoctoproject.org/msg09379.html">Mailing List post - The BitBake equivalent of "Hello, World!"</ulink> - </para></listitem> - <listitem><para> - <ulink url="http://hambedded.org/blog/2012/11/24/from-bitbake-hello-world-to-an-image/">Hambedded Linux blog post - From Bitbake Hello World to an Image</ulink> - </para></listitem> - </itemizedlist> - </note> - - <para> - As stated earlier, the goal of this example - is to eventually compile "Hello World". - However, it is unknown what BitBake needs and what you have - to provide in order to achieve that goal. - Recall that BitBake utilizes three types of metadata files: - <link linkend='configuration-files'>Configuration Files</link>, - <link linkend='classes'>Classes</link>, and - <link linkend='recipes'>Recipes</link>. - But where do they go? - How does BitBake find them? - BitBake's error messaging helps you answer these types of questions - and helps you better understand exactly what is going on. - </para> - - <para> - Following is the complete "Hello World" example. - </para> - - <orderedlist> - <listitem><para><emphasis>Create a Project Directory:</emphasis> - First, set up a directory for the "Hello World" project. - Here is how you can do so in your home directory: - <literallayout class='monospaced'> - $ mkdir ~/hello - $ cd ~/hello - </literallayout> - This is the directory that BitBake will use to do all of - its work. - You can use this directory to keep all the metafiles needed - by BitBake. - Having a project directory is a good way to isolate your - project. - </para></listitem> - <listitem><para><emphasis>Run Bitbake:</emphasis> - At this point, you have nothing but a project directory. - Run the <filename>bitbake</filename> command and see what - it does: - <literallayout class='monospaced'> - $ bitbake - The BBPATH variable is not set and bitbake did not - find a conf/bblayers.conf file in the expected location. - Maybe you accidentally invoked bitbake from the wrong directory? - DEBUG: Removed the following variables from the environment: - GNOME_DESKTOP_SESSION_ID, XDG_CURRENT_DESKTOP, - GNOME_KEYRING_CONTROL, DISPLAY, SSH_AGENT_PID, LANG, no_proxy, - XDG_SESSION_PATH, XAUTHORITY, SESSION_MANAGER, SHLVL, - MANDATORY_PATH, COMPIZ_CONFIG_PROFILE, WINDOWID, EDITOR, - GPG_AGENT_INFO, SSH_AUTH_SOCK, GDMSESSION, GNOME_KEYRING_PID, - XDG_SEAT_PATH, XDG_CONFIG_DIRS, LESSOPEN, DBUS_SESSION_BUS_ADDRESS, - _, XDG_SESSION_COOKIE, DESKTOP_SESSION, LESSCLOSE, DEFAULTS_PATH, - UBUNTU_MENUPROXY, OLDPWD, XDG_DATA_DIRS, COLORTERM, LS_COLORS - </literallayout> - The majority of this output is specific to environment variables - that are not directly relevant to BitBake. - However, the very first message regarding the - <filename>BBPATH</filename> variable and the - <filename>conf/bblayers.conf</filename> file - is relevant.</para> - <para> - When you run BitBake, it begins looking for metadata files. - The - <link linkend='var-BBPATH'><filename>BBPATH</filename></link> - variable is what tells BitBake where to look for those files. - <filename>BBPATH</filename> is not set and you need to set it. - Without <filename>BBPATH</filename>, Bitbake cannot - find any configuration files (<filename>.conf</filename>) - or recipe files (<filename>.bb</filename>) at all. - BitBake also cannot find the <filename>bitbake.conf</filename> - file. - </para></listitem> - <listitem><para><emphasis>Setting <filename>BBPATH</filename>:</emphasis> - For this example, you can set <filename>BBPATH</filename> - in the same manner that you set <filename>PATH</filename> - earlier in the appendix. - You should realize, though, that it is much more flexible to set the - <filename>BBPATH</filename> variable up in a configuration - file for each project.</para> - <para>From your shell, enter the following commands to set and - export the <filename>BBPATH</filename> variable: - <literallayout class='monospaced'> - $ BBPATH="<replaceable>projectdirectory</replaceable>" - $ export BBPATH - </literallayout> - Use your actual project directory in the command. - BitBake uses that directory to find the metadata it needs for - your project. - <note> - When specifying your project directory, do not use the - tilde ("~") character as BitBake does not expand that character - as the shell would. - </note> - </para></listitem> - <listitem><para><emphasis>Run Bitbake:</emphasis> - Now that you have <filename>BBPATH</filename> defined, run - the <filename>bitbake</filename> command again: - <literallayout class='monospaced'> - $ bitbake - ERROR: Traceback (most recent call last): - File "/home/scott-lenovo/bitbake/lib/bb/cookerdata.py", line 163, in wrapped - return func(fn, *args) - File "/home/scott-lenovo/bitbake/lib/bb/cookerdata.py", line 173, in parse_config_file - return bb.parse.handle(fn, data, include) - File "/home/scott-lenovo/bitbake/lib/bb/parse/__init__.py", line 99, in handle - return h['handle'](fn, data, include) - File "/home/scott-lenovo/bitbake/lib/bb/parse/parse_py/ConfHandler.py", line 120, in handle - abs_fn = resolve_file(fn, data) - File "/home/scott-lenovo/bitbake/lib/bb/parse/__init__.py", line 117, in resolve_file - raise IOError("file %s not found in %s" % (fn, bbpath)) - IOError: file conf/bitbake.conf not found in /home/scott-lenovo/hello - - ERROR: Unable to parse conf/bitbake.conf: file conf/bitbake.conf not found in /home/scott-lenovo/hello - </literallayout> - This sample output shows that BitBake could not find the - <filename>conf/bitbake.conf</filename> file in the project - directory. - This file is the first thing BitBake must find in order - to build a target. - And, since the project directory for this example is - empty, you need to provide a <filename>conf/bitbake.conf</filename> - file. - </para></listitem> - <listitem><para><emphasis>Creating <filename>conf/bitbake.conf</filename>:</emphasis> - The <filename>conf/bitbake.conf</filename> includes a number of - configuration variables BitBake uses for metadata and recipe - files. - For this example, you need to create the file in your project directory - and define some key BitBake variables. - For more information on the <filename>bitbake.conf</filename>, - see - <ulink url='http://hambedded.org/blog/2012/11/24/from-bitbake-hello-world-to-an-image/#an-overview-of-bitbakeconf'></ulink> - </para> - <para>Use the following commands to create the <filename>conf</filename> - directory in the project directory: - <literallayout class='monospaced'> - $ mkdir conf - </literallayout> - From within the <filename>conf</filename> directory, use - some editor to create the <filename>bitbake.conf</filename> - so that it contains the following: - <literallayout class='monospaced'> - TMPDIR = "${<link linkend='var-TOPDIR'>TOPDIR</link>}/tmp" - <link linkend='var-CACHE'>CACHE</link> = "${TMPDIR}/cache" - <link linkend='var-STAMP'>STAMP</link> = "${TMPDIR}/stamps" - <link linkend='var-T'>T</link> = "${TMPDIR}/work" - <link linkend='var-B'>B</link> = "${TMPDIR}" - </literallayout> - The <filename>TMPDIR</filename> variable establishes a directory - that BitBake uses for build output and intermediate files (other - than the cached information used by the - <link linkend='setscene'>Setscene</link> process. - Here, the <filename>TMPDIR</filename> directory is set to - <filename>hello/tmp</filename>. - <note><title>Tip</title> - You can always safely delete the <filename>tmp</filename> - directory in order to rebuild a BitBake target. - The build process creates the directory for you - when you run BitBake. - </note></para> - <para>For information about each of the other variables defined in this - example, click on the links to take you to the definitions in - the glossary. - </para></listitem> - <listitem><para><emphasis>Run Bitbake:</emphasis> - After making sure that the <filename>conf/bitbake.conf</filename> - file exists, you can run the <filename>bitbake</filename> - command again: - <literallayout class='monospaced'> -$ bitbake -ERROR: Traceback (most recent call last): - File "/home/scott-lenovo/bitbake/lib/bb/cookerdata.py", line 163, in wrapped - return func(fn, *args) - File "/home/scott-lenovo/bitbake/lib/bb/cookerdata.py", line 177, in _inherit - bb.parse.BBHandler.inherit(bbclass, "configuration INHERITs", 0, data) - File "/home/scott-lenovo/bitbake/lib/bb/parse/parse_py/BBHandler.py", line 92, in inherit - include(fn, file, lineno, d, "inherit") - File "/home/scott-lenovo/bitbake/lib/bb/parse/parse_py/ConfHandler.py", line 100, in include - raise ParseError("Could not %(error_out)s file %(fn)s" % vars(), oldfn, lineno) -ParseError: ParseError in configuration INHERITs: Could not inherit file classes/base.bbclass - -ERROR: Unable to parse base: ParseError in configuration INHERITs: Could not inherit file classes/base.bbclass - </literallayout> - In the sample output, BitBake could not find the - <filename>classes/base.bbclass</filename> file. - You need to create that file next. - </para></listitem> - <listitem><para><emphasis>Creating <filename>classes/base.bbclass</filename>:</emphasis> - BitBake uses class files to provide common code and functionality. - The minimally required class for BitBake is the - <filename>classes/base.bbclass</filename> file. - The <filename>base</filename> class is implicitly inherited by - every recipe. - BitBake looks for the class in the <filename>classes</filename> - directory of the project (i.e <filename>hello/classes</filename> - in this example). - </para> - <para>Create the <filename>classes</filename> directory as follows: - <literallayout class='monospaced'> - $ cd $HOME/hello - $ mkdir classes - </literallayout> - Move to the <filename>classes</filename> directory and then - create the <filename>base.bbclass</filename> file by inserting - this single line: - <literallayout class='monospaced'> - addtask build - </literallayout> - The minimal task that BitBake runs is the - <filename>do_build</filename> task. - This is all the example needs in order to build the project. - Of course, the <filename>base.bbclass</filename> can have much - more depending on which build environments BitBake is - supporting. - For more information on the <filename>base.bbclass</filename> file, - you can look at - <ulink url='http://hambedded.org/blog/2012/11/24/from-bitbake-hello-world-to-an-image/#tasks'></ulink>. - </para></listitem> - <listitem><para><emphasis>Run Bitbake:</emphasis> - After making sure that the <filename>classes/base.bbclass</filename> - file exists, you can run the <filename>bitbake</filename> - command again: - <literallayout class='monospaced'> - $ bitbake - Nothing to do. Use 'bitbake world' to build everything, or run 'bitbake --help' for usage information. - </literallayout> - BitBake is finally reporting no errors. - However, you can see that it really does not have anything - to do. - You need to create a recipe that gives BitBake something to do. - </para></listitem> - <listitem><para><emphasis>Creating a Layer:</emphasis> - While it is not really necessary for such a small example, - it is good practice to create a layer in which to keep your - code separate from the general metadata used by BitBake. - Thus, this example creates and uses a layer called "mylayer". - <note> - You can find additional information on adding a layer at - <ulink url='http://hambedded.org/blog/2012/11/24/from-bitbake-hello-world-to-an-image/#adding-an-example-layer'></ulink>. - </note> - </para> - <para>Minimally, you need a recipe file and a layer configuration - file in your layer. - The configuration file needs to be in the <filename>conf</filename> - directory inside the layer. - Use these commands to set up the layer and the <filename>conf</filename> - directory: - <literallayout class='monospaced'> - $ cd $HOME - $ mkdir mylayer - $ cd mylayer - $ mkdir conf - </literallayout> - Move to the <filename>conf</filename> directory and create a - <filename>layer.conf</filename> file that has the following: - <literallayout class='monospaced'> - BBPATH .= ":${<link linkend='var-LAYERDIR'>LAYERDIR</link>}" - - <link linkend='var-BBFILES'>BBFILES</link> += "${LAYERDIR}/*.bb" - - <link linkend='var-BBFILE_COLLECTIONS'>BBFILE_COLLECTIONS</link> += "mylayer" - <link linkend='var-BBFILE_PATTERN'>BBFILE_PATTERN_mylayer</link> := "^${LAYERDIR}/" - </literallayout> - For information on these variables, click the links - to go to the definitions in the glossary.</para> - <para>You need to create the recipe file next. - Inside your layer at the top-level, use an editor and create - a recipe file named <filename>printhello.bb</filename> that - has the following: - <literallayout class='monospaced'> - <link linkend='var-DESCRIPTION'>DESCRIPTION</link> = "Prints Hello World" - <link linkend='var-PN'>PN</link> = 'printhello' - <link linkend='var-PV'>PV</link> = '1' - - python do_build() { - bb.plain("********************"); - bb.plain("* *"); - bb.plain("* Hello, World! *"); - bb.plain("* *"); - bb.plain("********************"); - } - </literallayout> - The recipe file simply provides a description of the - recipe, the name, version, and the <filename>do_build</filename> - task, which prints out "Hello World" to the console. - For more information on these variables, follow the links - to the glossary. - </para></listitem> - <listitem><para><emphasis>Run Bitbake With a Target:</emphasis> - Now that a BitBake target exists, run the command and provide - that target: - <literallayout class='monospaced'> - $ cd $HOME/hello - $ bitbake printhello - ERROR: no recipe files to build, check your BBPATH and BBFILES? - - Summary: There was 1 ERROR message shown, returning a non-zero exit code. - </literallayout> - We have created the layer with the recipe and the layer - configuration file but it still seems that BitBake cannot - find the recipe. - BitBake needs a <filename>conf/bblayers.conf</filename> that - lists the layers for the project. - Without this file, BitBake cannot find the recipe. - </para></listitem> - <listitem><para><emphasis>Creating <filename>conf/bblayers.conf</filename>:</emphasis> - BitBake uses the <filename>conf/bblayers.conf</filename> file - to locate layers needed for the project. - This file must reside in the <filename>conf</filename> directory - of the project (i.e. <filename>hello/conf</filename> for this - example).</para> - <para>Set your working directory to the <filename>hello/conf</filename> - directory and then create the <filename>bblayers.conf</filename> - file so that it contains the following: - <literallayout class='monospaced'> - BBLAYERS ?= " \ - /home/<you>/mylayer \ - " - </literallayout> - You need to provide your own information for - <filename>you</filename> in the file. - </para></listitem> - <listitem><para><emphasis>Run Bitbake With a Target:</emphasis> - Now that you have supplied the <filename>bblayers.conf</filename> - file, run the <filename>bitbake</filename> command and provide - the target: - <literallayout class='monospaced'> - $ bitbake printhello - Parsing recipes: 100% |##################################################################################| - Time: 00:00:00 - Parsing of 1 .bb files complete (0 cached, 1 parsed). 1 targets, 0 skipped, 0 masked, 0 errors. - NOTE: Resolving any missing task queue dependencies - NOTE: Preparing RunQueue - NOTE: Executing RunQueue Tasks - ******************** - * * - * Hello, World! * - * * - ******************** - NOTE: Tasks Summary: Attempted 1 tasks of which 0 didn't need to be rerun and all succeeded. - </literallayout> - BitBake finds the <filename>printhello</filename> recipe and - successfully runs the task. - <note> - After the first execution, re-running - <filename>bitbake printhello</filename> again will not - result in a BitBake run that prints the same console - output. - The reason for this is that the first time the - <filename>printhello.bb</filename> recipe's - <filename>do_build</filename> task executes - successfully, BitBake writes a stamp file for the task. - Thus, the next time you attempt to run the task - using that same <filename>bitbake</filename> command, - BitBake notices the stamp and therefore determines - that the task does not need to be re-run. - If you delete the <filename>tmp</filename> directory - or run <filename>bitbake -c clean printhello</filename> - and then re-run the build, the "Hello, World!" message will - be printed again. - </note> - </para></listitem> - </orderedlist> - </section> -</appendix> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-intro.xml b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-intro.xml deleted file mode 100644 index 7a37edd50..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-intro.xml +++ /dev/null @@ -1,691 +0,0 @@ -<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" - "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<chapter id="bitbake-user-manual-intro"> - <title>Overview</title> - - <para> - Welcome to the BitBake User Manual. - This manual provides information on the BitBake tool. - The information attempts to be as independent as possible regarding - systems that use BitBake, such as OpenEmbedded and the - Yocto Project. - In some cases, scenarios or examples within the context of - a build system are used in the manual to help with understanding. - For these cases, the manual clearly states the context. - </para> - - <section id="intro"> - <title>Introduction</title> - - <para> - Fundamentally, BitBake is a generic task execution - engine that allows shell and Python tasks to be run - efficiently and in parallel while working within - complex inter-task dependency constraints. - One of BitBake's main users, OpenEmbedded, takes this core - and builds embedded Linux software stacks using - a task-oriented approach. - </para> - - <para> - Conceptually, BitBake is similar to GNU Make in - some regards but has significant differences: - <itemizedlist> - <listitem><para> - BitBake executes tasks according to provided - metadata that builds up the tasks. - Metadata is stored in recipe (<filename>.bb</filename>) - and related recipe "append" (<filename>.bbappend</filename>) - files, configuration (<filename>.conf</filename>) and - underlying include (<filename>.inc</filename>) files, and - in class (<filename>.bbclass</filename>) files. - The metadata provides - BitBake with instructions on what tasks to run and - the dependencies between those tasks. - </para></listitem> - <listitem><para> - BitBake includes a fetcher library for obtaining source - code from various places such as local files, source control - systems, or websites. - </para></listitem> - <listitem><para> - The instructions for each unit to be built (e.g. a piece - of software) are known as "recipe" files and - contain all the information about the unit - (dependencies, source file locations, checksums, description - and so on). - </para></listitem> - <listitem><para> - BitBake includes a client/server abstraction and can - be used from a command line or used as a service over - XML-RPC and has several different user interfaces. - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id="history-and-goals"> - <title>History and Goals</title> - - <para> - BitBake was originally a part of the OpenEmbedded project. - It was inspired by the Portage package management system - used by the Gentoo Linux distribution. - On December 7, 2004, OpenEmbedded project team member - Chris Larson split the project into two distinct pieces: - <itemizedlist> - <listitem><para>BitBake, a generic task executor</para></listitem> - <listitem><para>OpenEmbedded, a metadata set utilized by - BitBake</para></listitem> - </itemizedlist> - Today, BitBake is the primary basis of the - <ulink url="http://www.openembedded.org/">OpenEmbedded</ulink> - project, which is being used to build and maintain Linux - distributions such as the - <ulink url='http://www.angstrom-distribution.org/'>Angstrom Distribution</ulink>, - and which is also being used as the build tool for Linux projects - such as the - <ulink url='http://www.yoctoproject.org'>Yocto Project</ulink>. - </para> - - <para> - Prior to BitBake, no other build tool adequately met the needs of - an aspiring embedded Linux distribution. - All of the build systems used by traditional desktop Linux - distributions lacked important functionality, and none of the - ad hoc Buildroot-based systems, prevalent in the - embedded space, were scalable or maintainable. - </para> - - <para> - Some important original goals for BitBake were: - <itemizedlist> - <listitem><para> - Handle cross-compilation. - </para></listitem> - <listitem><para> - Handle inter-package dependencies (build time on - target architecture, build time on native - architecture, and runtime). - </para></listitem> - <listitem><para> - Support running any number of tasks within a given - package, including, but not limited to, fetching - upstream sources, unpacking them, patching them, - configuring them, and so forth. - </para></listitem> - <listitem><para> - Be Linux distribution agnostic for both build and - target systems. - </para></listitem> - <listitem><para> - Be architecture agnostic. - </para></listitem> - <listitem><para> - Support multiple build and target operating systems - (e.g. Cygwin, the BSDs, and so forth). - </para></listitem> - <listitem><para> - Be self contained, rather than tightly - integrated into the build machine's root - filesystem. - </para></listitem> - <listitem><para> - Handle conditional metadata on the target architecture, - operating system, distribution, and machine. - </para></listitem> - <listitem><para> - Be easy to use the tools to supply local metadata and packages - against which to operate. - </para></listitem> - <listitem><para> - Be easy to use BitBake to collaborate between multiple - projects for their builds. - </para></listitem> - <listitem><para> - Provide an inheritance mechanism to share - common metadata between many packages. - </para></listitem> - </itemizedlist> - Over time it became apparent that some further requirements - were necessary: - <itemizedlist> - <listitem><para> - Handle variants of a base recipe (e.g. native, sdk, - and multilib). - </para></listitem> - <listitem><para> - Split metadata into layers and allow layers - to enhance or override other layers. - </para></listitem> - <listitem><para> - Allow representation of a given set of input variables - to a task as a checksum. - Based on that checksum, allow acceleration of builds - with prebuilt components. - </para></listitem> - </itemizedlist> - BitBake satisfies all the original requirements and many more - with extensions being made to the basic functionality to - reflect the additional requirements. - Flexibility and power have always been the priorities. - BitBake is highly extensible and supports embedded Python code and - execution of any arbitrary tasks. - </para> - </section> - - <section id="Concepts"> - <title>Concepts</title> - - <para> - BitBake is a program written in the Python language. - At the highest level, BitBake interprets metadata, decides - what tasks are required to run, and executes those tasks. - Similar to GNU Make, BitBake controls how software is - built. - GNU Make achieves its control through "makefiles", while - BitBake uses "recipes". - </para> - - <para> - BitBake extends the capabilities of a simple - tool like GNU Make by allowing for the definition of much more - complex tasks, such as assembling entire embedded Linux - distributions. - </para> - - <para> - The remainder of this section introduces several concepts - that should be understood in order to better leverage - the power of BitBake. - </para> - - <section id='recipes'> - <title>Recipes</title> - - <para> - BitBake Recipes, which are denoted by the file extension - <filename>.bb</filename>, are the most basic metadata files. - These recipe files provide BitBake with the following: - <itemizedlist> - <listitem><para>Descriptive information about the - package (author, homepage, license, and so on)</para></listitem> - <listitem><para>The version of the recipe</para></listitem> - <listitem><para>Existing dependencies (both build - and runtime dependencies)</para></listitem> - <listitem><para>Where the source code resides and - how to fetch it</para></listitem> - <listitem><para>Whether the source code requires - any patches, where to find them, and how to apply - them</para></listitem> - <listitem><para>How to configure and compile the - source code</para></listitem> - <listitem><para>Where on the target machine to install the - package or packages created</para></listitem> - </itemizedlist> - </para> - - <para> - Within the context of BitBake, or any project utilizing BitBake - as its build system, files with the <filename>.bb</filename> - extension are referred to as recipes. - <note> - The term "package" is also commonly used to describe recipes. - However, since the same word is used to describe packaged - output from a project, it is best to maintain a single - descriptive term - "recipes". - Put another way, a single "recipe" file is quite capable - of generating a number of related but separately installable - "packages". - In fact, that ability is fairly common. - </note> - </para> - </section> - - <section id='configuration-files'> - <title>Configuration Files</title> - - <para> - Configuration files, which are denoted by the - <filename>.conf</filename> extension, define - various configuration variables that govern the project's build - process. - These files fall into several areas that define - machine configuration options, distribution configuration - options, compiler tuning options, general common - configuration options, and user configuration options. - The main configuration file is the sample - <filename>bitbake.conf</filename> file, which is - located within the BitBake source tree - <filename>conf</filename> directory. - </para> - </section> - - <section id='classes'> - <title>Classes</title> - - <para> - Class files, which are denoted by the - <filename>.bbclass</filename> extension, contain - information that is useful to share between metadata files. - The BitBake source tree currently comes with one class metadata file - called <filename>base.bbclass</filename>. - You can find this file in the - <filename>classes</filename> directory. - The <filename>base.bbclass</filename> class files is special since it - is always included automatically for all recipes - and classes. - This class contains definitions for standard basic tasks such - as fetching, unpacking, configuring (empty by default), - compiling (runs any Makefile present), installing (empty by - default) and packaging (empty by default). - These tasks are often overridden or extended by other classes - added during the project development process. - </para> - </section> - - <section id='layers'> - <title>Layers</title> - - <para> - Layers allow you to isolate different types of - customizations from each other. - While you might find it tempting to keep everything in one layer - when working on a single project, the more modular you organize - your metadata, the easier it is to cope with future changes. - </para> - - <para> - To illustrate how you can use layers to keep things modular, - consider customizations you might make to support a specific target machine. - These types of customizations typically reside in a special layer, - rather than a general layer, called a Board Support Package (BSP) - Layer. - Furthermore, the machine customizations should be isolated from - recipes and metadata that support a new GUI environment, for - example. - This situation gives you a couple of layers: one for the machine - configurations and one for the GUI environment. - It is important to understand, however, that the BSP layer can still - make machine-specific additions to recipes within - the GUI environment layer without polluting the GUI layer itself - with those machine-specific changes. - You can accomplish this through a recipe that is a BitBake append - (<filename>.bbappend</filename>) file. - </para> - </section> - - <section id='append-bbappend-files'> - <title>Append Files</title> - - <para> - Append files, which are files that have the - <filename>.bbappend</filename> file extension, extend or - override information in an existing recipe file. - </para> - - <para> - BitBake expects every append file to have a corresponding recipe file. - Furthermore, the append file and corresponding recipe file - must use the same root filename. - The filenames can differ only in the file type suffix used - (e.g. <filename>formfactor_0.0.bb</filename> and - <filename>formfactor_0.0.bbappend</filename>). - </para> - - <para> - Information in append files extends or - overrides the information in the underlying, - similarly-named recipe files. - </para> - - <para> - When you name an append file, you can use the - wildcard character (%) to allow for matching recipe names. - For example, suppose you have an append file named - as follows: - <literallayout class='monospaced'> - busybox_1.21.%.bbappend - </literallayout> - That append file would match any <filename>busybox_1.21.x.bb</filename> - version of the recipe. - So, the append file would match the following recipe names: - <literallayout class='monospaced'> - busybox_1.21.1.bb - busybox_1.21.2.bb - busybox_1.21.3.bb - </literallayout> - If the <filename>busybox</filename> recipe was updated to - <filename>busybox_1.3.0.bb</filename>, the append name would not - match. - However, if you named the append file - <filename>busybox_1.%.bbappend</filename>, then you would have a match. - </para> - - <para> - In the most general case, you could name the append file something as - simple as <filename>busybox_%.bbappend</filename> to be entirely - version independent. - </para> - </section> - </section> - - <section id='obtaining-bitbake'> - <title>Obtaining BitBake</title> - - <para> - You can obtain BitBake several different ways: - <itemizedlist> - <listitem><para><emphasis>Cloning BitBake:</emphasis> - Using Git to clone the BitBake source code repository - is the recommended method for obtaining BitBake. - Cloning the repository makes it easy to get bug fixes - and have access to stable branches and the master - branch. - Once you have cloned BitBake, you should use - the latest stable - branch for development since the master branch is for - BitBake development and might contain less stable changes. - </para> - <para>You usually need a version of BitBake - that matches the metadata you are using. - The metadata is generally backwards compatible but - not forward compatible.</para> - <para>Here is an example that clones the BitBake repository: - <literallayout class='monospaced'> - $ git clone git://git.openembedded.org/bitbake - </literallayout> - This command clones the BitBake Git repository into a - directory called <filename>bitbake</filename>. - Alternatively, you can - designate a directory after the - <filename>git clone</filename> command - if you want to call the new directory something - other than <filename>bitbake</filename>. - Here is an example that names the directory - <filename>bbdev</filename>: - <literallayout class='monospaced'> - $ git clone git://git.openembedded.org/bitbake bbdev - </literallayout></para></listitem> - <listitem><para><emphasis>Installation using your Distribution - Package Management System:</emphasis> - This method is not - recommended because the BitBake version that is - provided by your distribution, in most cases, - is several - releases behind a snapshot of the BitBake repository. - </para></listitem> - <listitem><para><emphasis>Taking a snapshot of BitBake:</emphasis> - Downloading a snapshot of BitBake from the - source code repository gives you access to a known - branch or release of BitBake. - <note> - Cloning the Git repository, as described earlier, - is the preferred method for getting BitBake. - Cloning the repository makes it easier to update as - patches are added to the stable branches. - </note></para> - <para>The following example downloads a snapshot of - BitBake version 1.17.0: - <literallayout class='monospaced'> - $ wget http://git.openembedded.org/bitbake/snapshot/bitbake-1.17.0.tar.gz - $ tar zxpvf bitbake-1.17.0.tar.gz - </literallayout> - After extraction of the tarball using the tar utility, - you have a directory entitled - <filename>bitbake-1.17.0</filename>. - </para></listitem> - <listitem><para><emphasis>Using the BitBake that Comes With Your - Build Checkout:</emphasis> - A final possibility for getting a copy of BitBake is that it - already comes with your checkout of a larger Bitbake-based build - system, such as Poky or Yocto Project. - Rather than manually checking out individual layers and - gluing them together yourself, you can check - out an entire build system. - The checkout will already include a version of BitBake that - has been thoroughly tested for compatibility with the other - components. - For information on how to check out a particular BitBake-based - build system, consult that build system's supporting documentation. - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id="bitbake-user-manual-command"> - <title>The BitBake Command</title> - - <para> - The <filename>bitbake</filename> command is the primary interface - to the BitBake tool. - This section presents the BitBake command syntax and provides - several execution examples. - </para> - - <section id='usage-and-syntax'> - <title>Usage and syntax</title> - - <para> - Following is the usage and syntax for BitBake: - <literallayout class='monospaced'> - $ bitbake -h - Usage: bitbake [options] [recipename/target recipe:do_task ...] - - Executes the specified task (default is 'build') for a given set of target recipes (.bb files). - It is assumed there is a conf/bblayers.conf available in cwd or in BBPATH which - will provide the layer, BBFILES and other configuration information. - - Options: - --version show program's version number and exit - -h, --help show this help message and exit - -b BUILDFILE, --buildfile=BUILDFILE - Execute tasks from a specific .bb recipe directly. - WARNING: Does not handle any dependencies from other - recipes. - -k, --continue Continue as much as possible after an error. While the - target that failed and anything depending on it cannot - be built, as much as possible will be built before - stopping. - -a, --tryaltconfigs Continue with builds by trying to use alternative - providers where possible. - -f, --force Force the specified targets/task to run (invalidating - any existing stamp file). - -c CMD, --cmd=CMD Specify the task to execute. The exact options - available depend on the metadata. Some examples might - be 'compile' or 'populate_sysroot' or 'listtasks' may - give a list of the tasks available. - -C INVALIDATE_STAMP, --clear-stamp=INVALIDATE_STAMP - Invalidate the stamp for the specified task such as - 'compile' and then run the default task for the - specified target(s). - -r PREFILE, --read=PREFILE - Read the specified file before bitbake.conf. - -R POSTFILE, --postread=POSTFILE - Read the specified file after bitbake.conf. - -v, --verbose Output more log message data to the terminal. - -D, --debug Increase the debug level. You can specify this more - than once. - -n, --dry-run Don't execute, just go through the motions. - -S SIGNATURE_HANDLER, --dump-signatures=SIGNATURE_HANDLER - Dump out the signature construction information, with - no task execution. The SIGNATURE_HANDLER parameter is - passed to the handler. Two common values are none and - printdiff but the handler may define more/less. none - means only dump the signature, printdiff means compare - the dumped signature with the cached one. - -p, --parse-only Quit after parsing the BB recipes. - -s, --show-versions Show current and preferred versions of all recipes. - -e, --environment Show the global or per-recipe environment complete - with information about where variables were - set/changed. - -g, --graphviz Save dependency tree information for the specified - targets in the dot syntax. - -I EXTRA_ASSUME_PROVIDED, --ignore-deps=EXTRA_ASSUME_PROVIDED - Assume these dependencies don't exist and are already - provided (equivalent to ASSUME_PROVIDED). Useful to - make dependency graphs more appealing - -l DEBUG_DOMAINS, --log-domains=DEBUG_DOMAINS - Show debug logging for the specified logging domains - -P, --profile Profile the command and save reports. - -u UI, --ui=UI The user interface to use (depexp, goggle, hob, knotty - or ncurses - default knotty). - -t SERVERTYPE, --servertype=SERVERTYPE - Choose which server type to use (process or xmlrpc - - default process). - --token=XMLRPCTOKEN Specify the connection token to be used when - connecting to a remote server. - --revisions-changed Set the exit code depending on whether upstream - floating revisions have changed or not. - --server-only Run bitbake without a UI, only starting a server - (cooker) process. - -B BIND, --bind=BIND The name/address for the bitbake server to bind to. - --no-setscene Do not run any setscene tasks. sstate will be ignored - and everything needed, built. - --remote-server=REMOTE_SERVER - Connect to the specified server. - -m, --kill-server Terminate the remote server. - --observe-only Connect to a server as an observing-only client. - --status-only Check the status of the remote bitbake server. - -w WRITEEVENTLOG, --write-log=WRITEEVENTLOG - Writes the event log of the build to a bitbake event - json file. Use '' (empty string) to assign the name - automatically. - </literallayout> - </para> - </section> - - <section id='bitbake-examples'> - <title>Examples</title> - - <para> - This section presents some examples showing how to use BitBake. - </para> - - <section id='example-executing-a-task-against-a-single-recipe'> - <title>Executing a Task Against a Single Recipe</title> - - <para> - Executing tasks for a single recipe file is relatively simple. - You specify the file in question, and BitBake parses - it and executes the specified task. - If you do not specify a task, BitBake executes the default - task, which is "build”. - BitBake obeys inter-task dependencies when doing - so. - </para> - - <para> - The following command runs the build task, which is - the default task, on the <filename>foo_1.0.bb</filename> - recipe file: - <literallayout class='monospaced'> - $ bitbake -b foo_1.0.bb - </literallayout> - The following command runs the clean task on the - <filename>foo.bb</filename> recipe file: - <literallayout class='monospaced'> - $ bitbake -b foo.bb -c clean - </literallayout> - <note> - The "-b" option explicitly does not handle recipe - dependencies. - Other than for debugging purposes, it is instead - recommended that you use the syntax presented in the - next section. - </note> - </para> - </section> - - <section id='executing-tasks-against-a-set-of-recipe-files'> - <title>Executing Tasks Against a Set of Recipe Files</title> - - <para> - There are a number of additional complexities introduced - when one wants to manage multiple <filename>.bb</filename> - files. - Clearly there needs to be a way to tell BitBake what - files are available and, of those, which you - want to execute. - There also needs to be a way for each recipe - to express its dependencies, both for build-time and - runtime. - There must be a way for you to express recipe preferences - when multiple recipes provide the same functionality, or when - there are multiple versions of a recipe. - </para> - - <para> - The <filename>bitbake</filename> command, when not using - "--buildfile" or "-b" only accepts a "PROVIDES". - You cannot provide anything else. - By default, a recipe file generally "PROVIDES" its - "packagename" as shown in the following example: - <literallayout class='monospaced'> - $ bitbake foo - </literallayout> - This next example "PROVIDES" the package name and also uses - the "-c" option to tell BitBake to just execute the - <filename>do_clean</filename> task: - <literallayout class='monospaced'> - $ bitbake -c clean foo - </literallayout> - </para> - </section> - - <section id='generating-dependency-graphs'> - <title>Generating Dependency Graphs</title> - - <para> - BitBake is able to generate dependency graphs using - the <filename>dot</filename> syntax. - You can convert these graphs into images using the - <filename>dot</filename> tool from - <ulink url='http://www.graphviz.org'>Graphviz</ulink>. - </para> - - <para> - When you generate a dependency graph, BitBake writes four files - to the current working directory: - <itemizedlist> - <listitem><para><emphasis><filename>package-depends.dot</filename>:</emphasis> - Shows BitBake's knowledge of dependencies between - runtime targets. - </para></listitem> - <listitem><para><emphasis><filename>pn-depends.dot</filename>:</emphasis> - Shows dependencies between build-time targets - (i.e. recipes). - </para></listitem> - <listitem><para><emphasis><filename>task-depends.dot</filename>:</emphasis> - Shows dependencies between tasks. - </para></listitem> - <listitem><para><emphasis><filename>pn-buildlist</filename>:</emphasis> - Shows a simple list of targets that are to be built. - </para></listitem> - </itemizedlist> - </para> - - <para> - To stop depending on common depends, use the "-I" depend - option and BitBake omits them from the graph. - Leaving this information out can produce more readable graphs. - This way, you can remove from the graph - <filename>DEPENDS</filename> from inherited classes - such as <filename>base.bbclass</filename>. - </para> - - <para> - Here are two examples that create dependency graphs. - The second example omits depends common in OpenEmbedded from - the graph: - <literallayout class='monospaced'> - $ bitbake -g foo - - $ bitbake -g -I virtual/kernel -I eglibc foo - </literallayout> - </para> - </section> - </section> - </section> -</chapter> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml deleted file mode 100644 index 6329cd6e4..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ /dev/null @@ -1,1918 +0,0 @@ -<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" -"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<chapter id="bitbake-user-manual-metadata"> - <title>Syntax and Operators</title> - - <para> - Bitbake files have their own syntax. - The syntax has similarities to several - other languages but also has some unique features. - This section describes the available syntax and operators - as well as provides examples. - </para> - - <section id='basic-syntax'> - <title>Basic Syntax</title> - - <para> - This section provides some basic syntax examples. - </para> - - <section id='basic-variable-setting'> - <title>Basic Variable Setting</title> - - <para> - The following example sets <filename>VARIABLE</filename> to - "value". - This assignment occurs immediately as the statement is parsed. - It is a "hard" assignment. - <literallayout class='monospaced'> - VARIABLE = "value" - </literallayout> - As expected, if you include leading or trailing spaces as part of - an assignment, the spaces are retained: - <literallayout class='monospaced'> - VARIABLE = " value" - VARIABLE = "value " - </literallayout> - Setting <filename>VARIABLE</filename> to "" sets it to an empty string, - while setting the variable to " " sets it to a blank space - (i.e. these are not the same values). - <literallayout class='monospaced'> - VARIABLE = "" - VARIABLE = " " - </literallayout> - </para> - </section> - - <section id='variable-expansion'> - <title>Variable Expansion</title> - - <para> - BitBake supports variables referencing one another's - contents using a syntax that is similar to shell scripting. - Following is an example that results in <filename>A</filename> - containing "aval" and <filename>B</filename> evaluating to - "preavalpost" based on that current value of - <filename>A</filename>. - <literallayout class='monospaced'> - A = "aval" - B = "pre${A}post" - </literallayout> - You should realize that whenever <filename>B</filename> is - referenced, its evaluation will depend on the state of - <filename>A</filename> at that time. - Thus, later evaluations of <filename>B</filename> in the - previous example could result in different values - depending on the value of <filename>A</filename>. - </para> - </section> - - <section id='setting-a-default-value'> - <title>Setting a default value (?=)</title> - - <para> - You can use the "?=" operator to achieve a "softer" assignment - for a variable. - This type of assignment allows you to define a variable if it - is undefined when the statement is parsed, but to leave the - value alone if the variable has a value. - Here is an example: - <literallayout class='monospaced'> - A ?= "aval" - </literallayout> - If <filename>A</filename> is set at the time this statement is parsed, - the variable retains its value. - However, if <filename>A</filename> is not set, - the variable is set to "aval". - <note> - This assignment is immediate. - Consequently, if multiple "?=" assignments - to a single variable exist, the first of those ends up getting - used. - </note> - </para> - </section> - - <section id='setting-a-weak-default-value'> - <title>Setting a weak default value (??=)</title> - - <para> - It is possible to use a "weaker" assignment than in the - previous section by using the "??=" operator. - This assignment behaves identical to "?=" except that the - assignment is made at the end of the parsing process rather - than immediately. - Consequently, when multiple "??=" assignments exist, the last - one is used. - Also, any "=" or "?=" assignment will override the value set with - "??=". - Here is an example: - <literallayout class='monospaced'> - A ??= "somevalue" - A ??= "someothervalue" - </literallayout> - If <filename>A</filename> is set before the above statements are parsed, - the variable retains its value. - If <filename>A</filename> is not set, - the variable is set to "someothervalue". - </para> - - <para> - Again, this assignment is a "lazy" or "weak" assignment - because it does not occur until the end - of the parsing process. - </para> - </section> - - <section id='immediate-variable-expansion'> - <title>Immediate variable expansion (:=)</title> - - <para> - The ":=" operator results in a variable's - contents being expanded immediately, - rather than when the variable is actually used: - <literallayout class='monospaced'> - T = "123" - A := "${B} ${A} test ${T}" - T = "456" - B = "${T} bval" - C = "cval" - C := "${C}append" - </literallayout> - In this example, <filename>A</filename> contains - "test 123" because <filename>${B}</filename> and - <filename>${A}</filename> at the time of parsing are undefined, - which leaves "test 123". - And, the variable <filename>C</filename> - contains "cvalappend" since <filename>${C}</filename> immediately - expands to "cval". - </para> - </section> - - <section id='appending-and-prepending'> - <title>Appending (+=) and prepending (=+) With Spaces</title> - - <para> - Appending and prepending values is common and can be accomplished - using the "+=" and "=+" operators. - These operators insert a space between the current - value and prepended or appended value. - </para> - - <para> - These operators take immediate effect during parsing. - Here are some examples: - <literallayout class='monospaced'> - B = "bval" - B += "additionaldata" - C = "cval" - C =+ "test" - </literallayout> - The variable <filename>B</filename> contains - "bval additionaldata" and <filename>C</filename> - contains "test cval". - </para> - </section> - - <section id='appending-and-prepending-without-spaces'> - <title>Appending (.=) and Prepending (=.) Without Spaces</title> - - <para> - If you want to append or prepend values without an - inserted space, use the ".=" and "=." operators. - </para> - - <para> - These operators take immediate effect during parsing. - Here are some examples: - <literallayout class='monospaced'> - B = "bval" - B .= "additionaldata" - C = "cval" - C =. "test" - </literallayout> - The variable <filename>B</filename> contains - "bvaladditionaldata" and - <filename>C</filename> contains "testcval". - </para> - </section> - - <section id='appending-and-prepending-override-style-syntax'> - <title>Appending and Prepending (Override Style Syntax)</title> - - <para> - You can also append and prepend a variable's value - using an override style syntax. - When you use this syntax, no spaces are inserted. - </para> - - <para> - These operators differ from the ":=", ".=", "=.", "+=", and "=+" - operators in that their effects are deferred - until after parsing completes rather than being immediately - applied. - Here are some examples: - <literallayout class='monospaced'> - B = "bval" - B_append = " additional data" - C = "cval" - C_prepend = "additional data " - D = "dval" - D_append = "additional data" - </literallayout> - The variable <filename>B</filename> becomes - "bval additional data" and <filename>C</filename> becomes - "additional data cval". - The variable <filename>D</filename> becomes - "dvaladditional data". - <note> - You must control all spacing when you use the - override syntax. - </note> - </para> - </section> - - <section id='removing-override-style-syntax'> - <title>Removal (Override Style Syntax)</title> - - <para> - You can remove values from lists using the removal - override style syntax. - Specifying a value for removal causes all occurrences of that - value to be removed from the variable. - </para> - - <para> - When you use this syntax, BitBake expects one or more strings. - Surrounding spaces are removed as well. - Here is an example: - <literallayout class='monospaced'> - FOO = "123 456 789 123456 123 456 123 456" - FOO_remove = "123" - FOO_remove = "456" - FOO2 = "abc def ghi abcdef abc def abc def" - FOO2_remove = "abc def" - </literallayout> - The variable <filename>FOO</filename> becomes - "789 123456" and <filename>FOO2</filename> becomes - "ghi abcdef". - </para> - </section> - - <section id='variable-flag-syntax'> - <title>Variable Flag Syntax</title> - - <para> - Variable flags are BitBake's implementation of variable properties - or attributes. - It is a way of tagging extra information onto a variable. - You can find more out about variable flags in general in the - "<link linkend='variable-flags'>Variable Flags</link>" - section. - </para> - - <para> - You can define, append, and prepend values to variable flags. - All the standard syntax operations previously mentioned work - for variable flags except for override style syntax - (i.e. <filename>_prepend</filename>, <filename>_append</filename>, - and <filename>_remove</filename>). - </para> - - <para> - Here are some examples showing how to set variable flags: - <literallayout class='monospaced'> - FOO[a] = "abc" - FOO[b] = "123" - FOO[a] += "456" - </literallayout> - The variable <filename>FOO</filename> has two flags: - <filename>a</filename> and <filename>b</filename>. - The flags are immediately set to "abc" and "123", respectively. - The <filename>a</filename> flag becomes "abc 456". - </para> - - <para> - No need exists to pre-define variable flags. - You can simply start using them. - One extremely common application - is to attach some brief documentation to a BitBake variable as - follows: - <literallayout class='monospaced'> - CACHE[doc] = "The directory holding the cache of the metadata." - </literallayout> - </para> - </section> - - <section id='inline-python-variable-expansion'> - <title>Inline Python Variable Expansion</title> - - <para> - You can use inline Python variable expansion to - set variables. - Here is an example: - <literallayout class='monospaced'> - DATE = "${@time.strftime('%Y%m%d',time.gmtime())}" - </literallayout> - This example results in the <filename>DATE</filename> - variable being set to the current date. - </para> - - <para> - Probably the most common use of this feature is to extract - the value of variables from BitBake's internal data dictionary, - <filename>d</filename>. - The following lines select the values of a package name - and its version number, respectively: - <literallayout class='monospaced'> - PN = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[0] or 'defaultpkgname'}" - PV = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[1] or '1.0'}" - </literallayout> - </para> - </section> - - <section id='providing-pathnames'> - <title>Providing Pathnames</title> - - <para> - When specifying pathnames for use with BitBake, - do not use the tilde ("~") character as a shortcut - for your home directory. - Doing so might cause BitBake to not recognize the - path since BitBake does not expand this character in - the same way a shell would. - </para> - - <para> - Instead, provide a fuller path as the following - example illustrates: - <literallayout class='monospaced'> - BBLAYERS ?= " \ - /home/scott-lenovo/LayerA \ - " - </literallayout> - </para> - </section> - </section> - - <section id='conditional-syntax-overrides'> - <title>Conditional Syntax (Overrides)</title> - - <para> - BitBake uses - <link linkend='var-OVERRIDES'><filename>OVERRIDES</filename></link> - to control what variables are overridden after BitBake - parses recipes and configuration files. - This section describes how you can use - <filename>OVERRIDES</filename> as conditional metadata, - talks about key expansion in relationship to - <filename>OVERRIDES</filename>, and provides some examples - to help with understanding. - </para> - - <section id='conditional-metadata'> - <title>Conditional Metadata</title> - - <para> - You can use <filename>OVERRIDES</filename> to conditionally select - a specific version of a variable and to conditionally - append or prepend the value of a variable. - <note> - Overrides can only use lower-case characters. - Additionally, underscores are not permitted in override names - as they are used to separate overrides from each other and - from the variable name. - </note> - <itemizedlist> - <listitem><para><emphasis>Selecting a Variable:</emphasis> - The <filename>OVERRIDES</filename> variable is - a colon-character-separated list that contains items - for which you want to satisfy conditions. - Thus, if you have a variable that is conditional on “arm”, and “arm” - is in <filename>OVERRIDES</filename>, then the “arm”-specific - version of the variable is used rather than the non-conditional - version. - Here is an example: - <literallayout class='monospaced'> - OVERRIDES = "architecture:os:machine" - TEST = "default" - TEST_os = "osspecific" - TEST_nooverride = "othercondvalue" - </literallayout> - In this example, the <filename>OVERRIDES</filename> - variable lists three overrides: - "architecture", "os", and "machine". - The variable <filename>TEST</filename> by itself has a default - value of "default". - You select the os-specific version of the <filename>TEST</filename> - variable by appending the "os" override to the variable - (i.e.<filename>TEST_os</filename>). - </para> - - <para> - To better understand this, consider a practical example - that assumes an OpenEmbedded metadata-based Linux - kernel recipe file. - The following lines from the recipe file first set - the kernel branch variable <filename>KBRANCH</filename> - to a default value, then conditionally override that - value based on the architecture of the build: - <literallayout class='monospaced'> - KBRANCH = "standard/base" - KBRANCH_qemuarm = "standard/arm-versatile-926ejs" - KBRANCH_qemumips = "standard/mti-malta32" - KBRANCH_qemuppc = "standard/qemuppc" - KBRANCH_qemux86 = "standard/common-pc/base" - KBRANCH_qemux86-64 = "standard/common-pc-64/base" - KBRANCH_qemumips64 = "standard/mti-malta64" - </literallayout> - </para></listitem> - <listitem><para><emphasis>Appending and Prepending:</emphasis> - BitBake also supports append and prepend operations to - variable values based on whether a specific item is - listed in <filename>OVERRIDES</filename>. - Here is an example: - <literallayout class='monospaced'> - DEPENDS = "glibc ncurses" - OVERRIDES = "machine:local" - DEPENDS_append_machine = "libmad" - </literallayout> - In this example, <filename>DEPENDS</filename> becomes - "glibc ncurses libmad". - </para> - - <para> - Again, using an OpenEmbedded metadata-based - kernel recipe file as an example, the - following lines will conditionally append to the - <filename>KERNEL_FEATURES</filename> variable based - on the architecture: - <literallayout class='monospaced'> - KERNEL_FEATURES_append = " ${KERNEL_EXTRA_FEATURES}" - KERNEL_FEATURES_append_qemux86=" cfg/sound.scc cfg/paravirt_kvm.scc" - KERNEL_FEATURES_append_qemux86-64=" cfg/sound.scc cfg/paravirt_kvm.scc" - </literallayout> - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id='key-expansion'> - <title>Key Expansion</title> - - <para> - Key expansion happens when the BitBake datastore is finalized - just before BitBake expands overrides. - To better understand this, consider the following example: - <literallayout class='monospaced'> - A${B} = "X" - B = "2" - A2 = "Y" - </literallayout> - In this case, after all the parsing is complete, and - before any overrides are handled, BitBake expands - <filename>${B}</filename> into "2". - This expansion causes <filename>A2</filename>, which was - set to "Y" before the expansion, to become "X". - </para> - </section> - - <section id='variable-interaction-worked-examples'> - <title>Examples</title> - - <para> - Despite the previous explanations that show the different forms of - variable definitions, it can be hard to work - out exactly what happens when variable operators, conditional - overrides, and unconditional overrides are combined. - This section presents some common scenarios along - with explanations for variable interactions that - typically confuse users. - </para> - - <para> - There is often confusion concerning the order in which - overrides and various "append" operators take effect. - Recall that an append or prepend operation using "_append" - and "_prepend" does not result in an immediate assignment - as would "+=", ".=", "=+", or "=.". - Consider the following example: - <literallayout class='monospaced'> - OVERRIDES = "foo" - A = "Z" - A_foo_append = "X" - </literallayout> - For this case, <filename>A</filename> is - unconditionally set to "Z" and "X" is - unconditionally and immediately appended to the variable - <filename>A_foo</filename>. - Because overrides have not been applied yet, - <filename>A_foo</filename> is set to "X" due to the append - and <filename>A</filename> simply equals "Z". - </para> - - <para> - Applying overrides, however, changes things. - Since "foo" is listed in <filename>OVERRIDES</filename>, - the conditional variable <filename>A</filename> is replaced - with the "foo" version, which is equal to "X". - So effectively, <filename>A_foo</filename> replaces <filename>A</filename>. - </para> - - <para> - This next example changes the order of the override and - the append: - <literallayout class='monospaced'> - OVERRIDES = "foo" - A = "Z" - A_append_foo = "X" - </literallayout> - For this case, before overrides are handled, - <filename>A</filename> is set to "Z" and <filename>A_append_foo</filename> - is set to "X". - Once the override for "foo" is applied, however, - <filename>A</filename> gets appended with "X". - Consequently, <filename>A</filename> becomes "ZX". - Notice that spaces are not appended. - </para> - - <para> - This next example has the order of the appends and overrides reversed - back as in the first example: - <literallayout class='monospaced'> - OVERRIDES = "foo" - A = "Y" - A_foo_append = "Z" - A_foo_append += "X" - </literallayout> - For this case, before any overrides are resolved, - <filename>A</filename> is set to "Y" using an immediate assignment. - After this immediate assignment, <filename>A_foo</filename> is set - to "Z", and then further appended with - "X" leaving the variable set to "Z X". - Finally, applying the override for "foo" results in the conditional - variable <filename>A</filename> becoming "Z X" (i.e. - <filename>A</filename> is replaced with <filename>A_foo</filename>). - </para> - - <para> - This final example mixes in some varying operators: - <literallayout class='monospaced'> - A = "1" - A_append = "2" - A_append = "3" - A += "4" - A .= "5" - </literallayout> - For this case, the type of append operators are affecting the - order of assignments as BitBake passes through the code - multiple times. - Initially, <filename>A</filename> is set to "1 45" because - of the three statements that use immediate operators. - After these assignments are made, BitBake applies the - <filename>_append</filename> operations. - Those operations result in <filename>A</filename> becoming "1 4523". - </para> - </section> - </section> - - <section id='sharing-functionality'> - <title>Sharing Functionality</title> - - <para> - BitBake allows for metadata sharing through include files - (<filename>.inc</filename>) and class files - (<filename>.bbclass</filename>). - For example, suppose you have a piece of common functionality - such as a task definition that you want to share between - more than one recipe. - In this case, creating a <filename>.bbclass</filename> - file that contains the common functionality and then using - the <filename>inherit</filename> directive in your recipes to - inherit the class would be a common way to share the task. - </para> - - <para> - This section presents the mechanisms BitBake provides to - allow you to share functionality between recipes. - Specifically, the mechanisms include <filename>include</filename>, - <filename>inherit</filename>, <filename>INHERIT</filename>, and - <filename>require</filename> directives. - </para> - - <section id='locating-include-and-class-files'> - <title>Locating Include and Class Files</title> - - <para> - BitBake uses the - <link linkend='var-BBPATH'><filename>BBPATH</filename></link> - variable to locate needed include and class files. - Additionally, BitBake searches the current directory for - <filename>include</filename> and <filename>require</filename> - directives. - <note> - The <filename>BBPATH</filename> variable is analogous to - the environment variable <filename>PATH</filename>. - </note> - </para> - - <para> - In order for include and class files to be found by BitBake, - they need to be located in a "classes" subdirectory that can - be found in <filename>BBPATH</filename>. - </para> - </section> - - <section id='inherit-directive'> - <title><filename>inherit</filename> Directive</title> - - <para> - When writing a recipe or class file, you can use the - <filename>inherit</filename> directive to inherit the - functionality of a class (<filename>.bbclass</filename>). - BitBake only supports this directive when used within recipe - and class files (i.e. <filename>.bb</filename> and - <filename>.bbclass</filename>). - </para> - - <para> - The <filename>inherit</filename> directive is a rudimentary - means of specifying what classes of functionality your - recipes require. - For example, you can easily abstract out the tasks involved in - building a package that uses Autoconf and Automake and put - those tasks into a class file that can be used by your recipe. - </para> - - <para> - As an example, your recipes could use the following directive - to inherit an <filename>autotools.bbclass</filename> file. - The class file would contain common functionality for using - Autotools that could be shared across recipes: - <literallayout class='monospaced'> - inherit autotools - </literallayout> - In this case, BitBake would search for the directory - <filename>classes/autotools.bbclass</filename> - in <filename>BBPATH</filename>. - <note> - You can override any values and functions of the - inherited class within your recipe by doing so - after the "inherit" statement. - </note> - </para> - - <para> - If necessary, it is possible to inherit a class - conditionally by using - a variable expression after the <filename>inherit</filename> - statement. - Here is an example: - <literallayout class='monospaced'> - inherit ${VARNAME} - </literallayout> - If <filename>VARNAME</filename> is going to be set, it needs - to be set before the <filename>inherit</filename> statement - is parsed. - One way to achieve a conditional inherit in this case is to use - overrides: - <literallayout class='monospaced'> - VARIABLE = "" - VARIABLE_someoverride = "myclass" - </literallayout> - </para> - - <para> - Another method is by using anonymous Python. - Here is an example: - <literallayout class='monospaced'> - python () { - if condition == value: - d.setVar('VARIABLE', 'myclass') - else: - d.setVar('VARIABLE', '') - } - </literallayout> - </para> - - <para> - Alternatively, you could use an in-line Python expression - in the following form: - <literallayout class='monospaced'> - inherit ${@'classname' if condition else ''} - inherit ${@functionname(params)} - </literallayout> - In all cases, if the expression evaluates to an empty - string, the statement does not trigger a syntax error - because it becomes a no-op. - </para> - </section> - - <section id='include-directive'> - <title><filename>include</filename> Directive</title> - - <para> - BitBake understands the <filename>include</filename> - directive. - This directive causes BitBake to parse whatever file you specify, - and to insert that file at that location. - The directive is much like its equivalent in Make except - that if the path specified on the include line is a relative - path, BitBake locates the first file it can find - within <filename>BBPATH</filename>. - </para> - - <para> - As an example, suppose you needed a recipe to include some - self-test definitions: - <literallayout class='monospaced'> - include test_defs.inc - </literallayout> - <note> - The <filename>include</filename> directive does not - produce an error when the file cannot be found. - Consequently, it is recommended that if the file you - are including is expected to exist, you should use - <link linkend='require-inclusion'><filename>require</filename></link> - instead of <filename>include</filename>. - Doing so makes sure that an error is produced if the - file cannot be found. - </note> - </para> - </section> - - <section id='require-inclusion'> - <title><filename>require</filename> Directive</title> - - <para> - BitBake understands the <filename>require</filename> - directive. - This directive behaves just like the - <filename>include</filename> directive with the exception that - BitBake raises a parsing error if the file to be included cannot - be found. - Thus, any file you require is inserted into the file that is - being parsed at the location of the directive. - </para> - - <para> - Similar to how BitBake handles - <link linkend='include-directive'><filename>include</filename></link>, - if the path specified - on the require line is a relative path, BitBake locates - the first file it can find within <filename>BBPATH</filename>. - </para> - - <para> - As an example, suppose you have two versions of a recipe - (e.g. <filename>foo_1.2.2.bb</filename> and - <filename>foo_2.0.0.bb</filename>) where - each version contains some identical functionality that could be - shared. - You could create an include file named <filename>foo.inc</filename> - that contains the common definitions needed to build "foo". - You need to be sure <filename>foo.inc</filename> is located in the - same directory as your two recipe files as well. - Once these conditions are set up, you can share the functionality - using a <filename>require</filename> directive from within each - recipe: - <literallayout class='monospaced'> - require foo.inc - </literallayout> - </para> - </section> - - <section id='inherit-configuration-directive'> - <title><filename>INHERIT</filename> Configuration Directive</title> - - <para> - When creating a configuration file (<filename>.conf</filename>), - you can use the <filename>INHERIT</filename> directive to - inherit a class. - BitBake only supports this directive when used within - a configuration file. - </para> - - <para> - As an example, suppose you needed to inherit a class - file called <filename>abc.bbclass</filename> from a - configuration file as follows: - <literallayout class='monospaced'> - INHERIT += "abc" - </literallayout> - This configuration directive causes the named - class to be inherited at the point of the directive - during parsing. - As with the <filename>inherit</filename> directive, the - <filename>.bbclass</filename> file must be located in a - "classes" subdirectory in one of the directories specified - in <filename>BBPATH</filename>. - <note> - Because <filename>.conf</filename> files are parsed - first during BitBake's execution, using - <filename>INHERIT</filename> to inherit a class effectively - inherits the class globally (i.e. for all recipes). - </note> - If you want to use the directive to inherit - multiple classes, you can provide them on the same line in the - <filename>local.conf</filename> file. - Use spaces to separate the classes. - The following example shows how to inherit both the - <filename>autotools</filename> and <filename>pkgconfig</filename> - classes: - <literallayout class='monospaced'> - inherit autotools pkgconfig - </literallayout> - </para> - </section> - </section> - - <section id='functions'> - <title>Functions</title> - - <para> - As with most languages, functions are the building blocks that - are used to build up operations into tasks. - BitBake supports these types of functions: - <itemizedlist> - <listitem><para><emphasis>Shell Functions:</emphasis> - Functions written in shell script and executed either - directly as functions, tasks, or both. - They can also be called by other shell functions. - </para></listitem> - <listitem><para><emphasis>BitBake Style Python Functions:</emphasis> - Functions written in Python and executed by BitBake or other - Python functions using <filename>bb.build.exec_func()</filename>. - </para></listitem> - <listitem><para><emphasis>Python Functions:</emphasis> - Functions written in Python and executed by Python. - </para></listitem> - <listitem><para><emphasis>Anonymous Python Functions:</emphasis> - Python functions executed automatically during - parsing. - </para></listitem> - </itemizedlist> - Regardless of the type of function, you can only - define them in class (<filename>.bbclass</filename>) - and recipe (<filename>.bb</filename> or <filename>.inc</filename>) - files. - </para> - - <section id='shell-functions'> - <title>Shell Functions</title> - - <para> - Functions written in shell script and executed either - directly as functions, tasks, or both. - They can also be called by other shell functions. - Here is an example shell function definition: - <literallayout class='monospaced'> - some_function () { - echo "Hello World" - } - </literallayout> - When you create these types of functions in your recipe - or class files, you need to follow the shell programming - rules. - The scripts are executed by <filename>/bin/sh</filename>, - which may not be a bash shell but might be something - such as <filename>dash</filename>. - You should not use Bash-specific script (bashisms). - </para> - </section> - - <section id='bitbake-style-python-functions'> - <title>BitBake Style Python Functions</title> - - <para> - These functions are written in Python and executed by - BitBake or other Python functions using - <filename>bb.build.exec_func()</filename>. - </para> - - <para> - An example BitBake function is: - <literallayout class='monospaced'> - python some_python_function () { - d.setVar("TEXT", "Hello World") - print d.getVar("TEXT", True) - } - </literallayout> - Because the Python "bb" and "os" modules are already - imported, you do not need to import these modules. - Also in these types of functions, the datastore ("d") - is a global variable and is always automatically - available. - </para> - - <note> - Variable expressions (e.g. <filename>${X}</filename>) are no - longer expanded within Python functions. - This behavior is intentional in order to allow you to freely - set variable values to expandable expressions without having - them expanded prematurely. - If you do wish to expand a variable within a Python function, - use <filename>d.getVar("X", True)</filename>. - Or, for more complicated expressions, use - <filename>d.expand()</filename>. - </note> - </section> - - <section id='python-functions'> - <title>Python Functions</title> - - <para> - These functions are written in Python and are executed by - other Python code. - Examples of Python functions are utility functions - that you intend to call from in-line Python or - from within other Python functions. - Here is an example: - <literallayout class='monospaced'> - def get_depends(d): - if d.getVar('SOMECONDITION', True): - return "dependencywithcond" - else: - return "dependency" - SOMECONDITION = "1" - DEPENDS = "${@get_depends(d)}" - </literallayout> - This would result in <filename>DEPENDS</filename> - containing <filename>dependencywithcond</filename>. - </para> - - <para> - Here are some things to know about Python functions: - <itemizedlist> - <listitem><para>Python functions can take parameters. - </para></listitem> - <listitem><para>The BitBake datastore is not - automatically available. - Consequently, you must pass it in as a - parameter to the function. - </para></listitem> - <listitem><para>The "bb" and "os" Python modules are - automatically available. - You do not need to import them. - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id='anonymous-python-functions'> - <title>Anonymous Python Functions</title> - - <para> - Sometimes it is useful to run some code during - parsing to set variables or to perform other operations - programmatically. - To do this, you can define an anonymous Python function. - Here is an example that conditionally sets a - variable based on the value of another variable: - <literallayout class='monospaced'> - python __anonymous () { - if d.getVar('SOMEVAR', True) == 'value': - d.setVar('ANOTHERVAR', 'value2') - } - </literallayout> - The "__anonymous" function name is optional, so the - following example is functionally equivalent to the above: - <literallayout class='monospaced'> - python () { - if d.getVar('SOMEVAR', True) == 'value': - d.setVar('ANOTHERVAR', 'value2') - } - </literallayout> - Because unlike other Python functions anonymous - Python functions are executed during parsing, the - "d" variable within an anonymous Python function represents - the datastore for the entire recipe. - Consequently, you can set variable values here and - those values can be picked up by other functions. - </para> - </section> - - <section id='flexible-inheritance-for-class-functions'> - <title>Flexible Inheritance for Class Functions</title> - - <para> - Through coding techniques and the use of - <filename>EXPORT_FUNCTIONS</filename>, BitBake supports - exporting a function from a class such that the - class function appears as the default implementation - of the function, but can still be called if a recipe - inheriting the class needs to define its own version of - the function. - </para> - - <para> - To understand the benefits of this feature, consider - the basic scenario where a class defines a task function - and your recipe inherits the class. - In this basic scenario, your recipe inherits the task - function as defined in the class. - If desired, your recipe can add to the start and end of the - function by using the "_prepend" or "_append" operations - respectively, or it can redefine the function completely. - However, if it redefines the function, there is - no means for it to call the class version of the function. - <filename>EXPORT_FUNCTIONS</filename> provides a mechanism - that enables the recipe's version of the function to call - the original version of the function. - </para> - - <para> - To make use of this technique, you need the following - things in place: - <itemizedlist> - <listitem><para> - The class needs to define the function as follows: - <literallayout class='monospaced'> - <replaceable>classname</replaceable><filename>_</filename><replaceable>functionname</replaceable> - </literallayout> - For example, if you have a class file - <filename>bar.bbclass</filename> and a function named - <filename>do_foo</filename>, the class must define the function - as follows: - <literallayout class='monospaced'> - bar_do_foo - </literallayout> - </para></listitem> - <listitem><para> - The class needs to contain the <filename>EXPORT_FUNCTIONS</filename> - statement as follows: - <literallayout class='monospaced'> - EXPORT_FUNCTIONS <replaceable>functionname</replaceable> - </literallayout> - For example, continuing with the same example, the - statement in the <filename>bar.bbclass</filename> would be - as follows: - <literallayout class='monospaced'> - EXPORT_FUNCTIONS do_foo - </literallayout> - </para></listitem> - <listitem><para> - You need to call the function appropriately from within your - recipe. - Continuing with the same example, if your recipe - needs to call the class version of the function, - it should call <filename>bar_do_foo</filename>. - Assuming <filename>do_foo</filename> was a shell function - and <filename>EXPORT_FUNCTIONS</filename> was used as above, - the recipe's function could conditionally call the - class version of the function as follows: - <literallayout class='monospaced'> - do_foo() { - if [ somecondition ] ; then - bar_do_foo - else - # Do something else - fi - } - </literallayout> - To call your modified version of the function as defined - in your recipe, call it as <filename>do_foo</filename>. - </para></listitem> - </itemizedlist> - With these conditions met, your single recipe - can freely choose between the original function - as defined in the class file and the modified function in your recipe. - If you do not set up these conditions, you are limited to using one function - or the other. - </para> - </section> - </section> - - <section id='tasks'> - <title>Tasks</title> - - <para> - Tasks are BitBake execution units that originate as - functions and make up the steps that BitBake needs to run - for given recipe. - Tasks are only supported in recipe (<filename>.bb</filename> - or <filename>.inc</filename>) and class - (<filename>.bbclass</filename>) files. - By convention, task names begin with the string "do_". - </para> - - <para> - Here is an example of a task that prints out the date: - <literallayout class='monospaced'> - python do_printdate () { - import time - print time.strftime('%Y%m%d', time.gmtime()) - } - addtask printdate after do_fetch before do_build - </literallayout> - </para> - - <section id='promoting-a-function-to-a-task'> - <title>Promoting a Function to a Task</title> - - <para> - Any function can be promoted to a task by applying the - <filename>addtask</filename> command. - The <filename>addtask</filename> command also describes - inter-task dependencies. - Here is the function from the previous section but with the - <filename>addtask</filename> command promoting it to a task - and defining some dependencies: - <literallayout class='monospaced'> - python do_printdate () { - import time - print time.strftime('%Y%m%d', time.gmtime()) - } - addtask printdate after do_fetch before do_build - </literallayout> - In the example, the function is defined and then promoted - as a task. - The <filename>do_printdate</filename> task becomes a dependency of - the <filename>do_build</filename> task, which is the default - task. - And, the <filename>do_printdate</filename> task is dependent upon - the <filename>do_fetch</filename> task. - Execution of the <filename>do_build</filename> task results - in the <filename>do_printdate</filename> task running first. - </para> - </section> - - <section id='deleting-a-task'> - <title>Deleting a Task</title> - - <para> - As well as being able to add tasks, you can delete them. - Simply use the <filename>deltask</filename> command to - delete a task. - For example, to delete the example task used in the previous - sections, you would use: - <literallayout class='monospaced'> - deltask printdate - </literallayout> - If you delete a task using the <filename>deltask</filename> - command and the task has dependencies, the dependencies are - not reconnected. - For example, suppose you have three tasks named - <filename>do_a</filename>, <filename>do_b</filename>, and - <filename>do_c</filename>. - Furthermore, <filename>do_c</filename> is dependent on - <filename>do_b</filename>, which in turn is dependent on - <filename>do_a</filename>. - Given this scenario, if you use <filename>deltask</filename> - to delete <filename>do_b</filename>, the implicit dependency - relationship between <filename>do_c</filename> and - <filename>do_a</filename> through <filename>do_b</filename> - no longer exists, and <filename>do_c</filename> dependencies - are not updated to include <filename>do_a</filename>. - Thus, <filename>do_c</filename> is free to run before - <filename>do_a</filename>. - </para> - - <para> - If you want dependencies such as these to remain intact, use - the <filename>noexec</filename> varflag to disable the task - instead of using the <filename>deltask</filename> command to - delete it: - <literallayout class='monospaced'> - do_b[noexec] = "1" - </literallayout> - </para> - </section> - - <section id='passing-information-into-the-build-task-environment'> - <title>Passing Information Into the Build Task Environment</title> - - <para> - When running a task, BitBake tightly controls the shell execution - environment of the build tasks to make - sure unwanted contamination from the build machine cannot - influence the build. - <note> - By default, BitBake cleans the environment to include only those - things exported or listed in its whitelist to ensure that the build - environment is reproducible and consistent. - You can prevent this "cleaning" by setting the - <link linkend='var-BB_PRESERVE_ENV'><filename>BB_PRESERVE_ENV</filename></link> - variable. - </note> - Consequently, if you do want something to get passed into the - build task environment, you must take these two steps: - <orderedlist> - <listitem><para> - Tell BitBake to load what you want from the environment - into the datastore. - You can do so through the - <link linkend='var-BB_ENV_WHITELIST'><filename>BB_ENV_WHITELIST</filename></link> - and - <link linkend='var-BB_ENV_EXTRAWHITE'><filename>BB_ENV_EXTRAWHITE</filename></link> - variables. - For example, assume you want to prevent the build system from - accessing your <filename>$HOME/.ccache</filename> - directory. - The following command "whitelists" the environment variable - <filename>CCACHE_DIR</filename> causing BitBack to allow that - variable into the datastore: - <literallayout class='monospaced'> - export BB_ENV_EXTRAWHITE="$BB_ENV_EXTRAWHITE CCACHE_DIR" - </literallayout></para></listitem> - <listitem><para> - Tell BitBake to export what you have loaded into the - datastore to the task environment of every running task. - Loading something from the environment into the datastore - (previous step) only makes it available in the datastore. - To export it to the task environment of every running task, - use a command similar to the following in your local configuration - file <filename>local.conf</filename> or your - distribution configuration file: - <literallayout class='monospaced'> - export CCACHE_DIR - </literallayout> - <note> - A side effect of the previous steps is that BitBake - records the variable as a dependency of the build process - in things like the setscene checksums. - If doing so results in unnecessary rebuilds of tasks, you can - whitelist the variable so that the setscene code - ignores the dependency when it creates checksums. - </note></para></listitem> - </orderedlist> - </para> - - <para> - Sometimes, it is useful to be able to obtain information - from the original execution environment. - Bitbake saves a copy of the original environment into - a special variable named - <link linkend='var-BB_ORIGENV'><filename>BB_ORIGENV</filename></link>. - </para> - - <para> - The <filename>BB_ORIGENV</filename> variable returns a datastore - object that can be queried using the standard datastore operators - such as <filename>getVar(, False)</filename>. - The datastore object is useful, for example, to find the original - <filename>DISPLAY</filename> variable. - Here is an example: - <literallayout class='monospaced'> - origenv = d.getVar("BB_ORIGENV", False) - bar = origenv.getVar("BAR", False) - </literallayout> - The previous example returns <filename>BAR</filename> from the original - execution environment. - </para> - </section> - </section> - - <section id='variable-flags'> - <title>Variable Flags</title> - - <para> - Variable flags (varflags) help control a task's functionality - and dependencies. - BitBake reads and writes varflags to the datastore using the following - command forms: - <literallayout class='monospaced'> - <replaceable>variable</replaceable> = d.getVarFlags("<replaceable>variable</replaceable>") - self.d.setVarFlags("FOO", {"func": True}) - </literallayout> - </para> - - <para> - When working with varflags, the same syntax, with the exception of - overrides, applies. - In other words, you can set, append, and prepend varflags just like - variables. - See the - "<link linkend='variable-flag-syntax'>Variable Flag Syntax</link>" - section for details. - </para> - - <para> - BitBake has a defined set of varflags available for recipes and - classes. - Tasks support a number of these flags which control various - functionality of the task: - <itemizedlist> - <listitem><para><emphasis>cleandirs:</emphasis> - Empty directories that should created before the task runs. - </para></listitem> - <listitem><para><emphasis>depends:</emphasis> - Controls inter-task dependencies. - See the - <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link> - variable and the - "<link linkend='inter-task-dependencies'>Inter-Task Dependencies</link>" - section for more information. - </para></listitem> - <listitem><para><emphasis>deptask:</emphasis> - Controls task build-time dependencies. - See the - <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link> - variable and the - "<link linkend='build-dependencies'>Build Dependencies</link>" - section for more information. - </para></listitem> - <listitem><para><emphasis>dirs:</emphasis> - Directories that should be created before the task runs. - The last directory listed will be used as the work directory - for the task. - </para></listitem> - <listitem><para><emphasis>lockfiles:</emphasis> - Specifies one or more lockfiles to lock while the task - executes. - Only one task may hold a lockfile, and any task that - attempts to lock an already locked file will block until - the lock is released. - You can use this variable flag to accomplish mutual - exclusion. - </para></listitem> - <listitem><para><emphasis>noexec:</emphasis> - Marks the tasks as being empty and no execution required. - The <filename>noexec</filename> flag can be used to set up - tasks as dependency placeholders, or to disable tasks defined - elsewhere that are not needed in a particular recipe. - </para></listitem> - <listitem><para><emphasis>nostamp:</emphasis> - Tells BitBake to not generate a stamp file for a task, - which implies the task should always be executed. - </para></listitem> - <listitem><para><emphasis>postfuncs:</emphasis> - List of functions to call after the completion of the task. - </para></listitem> - <listitem><para><emphasis>prefuncs:</emphasis> - List of functions to call before the task executes. - </para></listitem> - <listitem><para><emphasis>rdepends:</emphasis> - Controls inter-task runtime dependencies. - See the - <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> - variable, the - <link linkend='var-RRECOMMENDS'><filename>RRECOMMENDS</filename></link> - variable, and the - "<link linkend='inter-task-dependencies'>Inter-Task Dependencies</link>" - section for more information. - </para></listitem> - <listitem><para><emphasis>rdeptask:</emphasis> - Controls task runtime dependencies. - See the - <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> - variable, the - <link linkend='var-RRECOMMENDS'><filename>RRECOMMENDS</filename></link> - variable, and the - "<link linkend='runtime-dependencies'>Runtime Dependencies</link>" - section for more information. - </para></listitem> - <listitem><para><emphasis>recideptask:</emphasis> - When set in conjunction with - <filename>recrdeptask</filename>, specifies a task that - should be inspected for additional dependencies. - </para></listitem> - <listitem><para><emphasis>recrdeptask:</emphasis> - Controls task recursive runtime dependencies. - See the - <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> - variable, the - <link linkend='var-RRECOMMENDS'><filename>RRECOMMENDS</filename></link> - variable, and the - "<link linkend='recursive-dependencies'>Recursive Dependencies</link>" - section for more information. - </para></listitem> - <listitem><para><emphasis>stamp-extra-info:</emphasis> - Extra stamp information to append to the task's stamp. - As an example, OpenEmbedded uses this flag to allow - machine-specific tasks. - </para></listitem> - <listitem><para><emphasis>umask:</emphasis> - The umask to run the task under. - </para></listitem> - </itemizedlist> - </para> - - <para> - Several varflags are useful for controlling how signatures are - calculated for variables. - For more information on this process, see the - "<link linkend='checksums'>Checksums (Signatures)</link>" - section. - <itemizedlist> - <listitem><para><emphasis>vardeps:</emphasis> - Specifies a space-separated list of additional - variables to add to a variable's dependencies - for the purposes of calculating its signature. - Adding variables to this list is useful, for example, when - a function refers to a variable in a manner that - does not allow BitBake to automatically determine - that the variable is referred to. - </para></listitem> - <listitem><para><emphasis>vardepsexclude:</emphasis> - Specifies a space-separated list of variables - that should be excluded from a variable's dependencies - for the purposes of calculating its signature. - </para></listitem> - <listitem><para><emphasis>vardepvalue:</emphasis> - If set, instructs BitBake to ignore the actual - value of the variable and instead use the specified - value when calculating the variable's signature. - </para></listitem> - <listitem><para><emphasis>vardepvalueexclude:</emphasis> - Specifies a pipe-separated list of strings to exclude - from the variable's value when calculating the - variable's signature. - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id='events'> - <title>Events</title> - - <para> - BitBake allows installation of event handlers within - recipe and class files. - Events are triggered at certain points during operation, - such as the beginning of an operation against a given recipe - (<filename>*.bb</filename> file), the start of a given task, - task failure, task success, and so forth. - The intent is to make it easy to do things like email - notification on build failure. - </para> - - <para> - Following is an example event handler that - prints the name of the event and the content of - the <filename>FILE</filename> variable: - <literallayout class='monospaced'> - addhandler myclass_eventhandler - python myclass_eventhandler() { - from bb.event import getName - from bb import data - print("The name of the Event is %s" % getName(e)) - print("The file we run for is %s" % data.getVar('FILE', e.data, True)) - } - </literallayout> - This event handler gets called every time an event is - triggered. - A global variable "<filename>e</filename>" is defined and - "<filename>e.data</filename>" contains an instance of - "<filename>bb.data</filename>". - With the <filename>getName(e)</filename> method, one can get - the name of the triggered event. - </para> - - <para> - Because you probably are only interested in a subset of events, - you would likely use the <filename>[eventmask]</filename> flag - for your event handler to be sure that only certain events - trigger the handler. - Given the previous example, suppose you only wanted the - <filename>bb.build.TaskFailed</filename> event to trigger that - event handler. - Use the flag as follows: - <literallayout class='monospaced'> - addhandler myclass_eventhandler - myclass_eventhandler[eventmask] = "bb.build.TaskFailed" - python myclass_eventhandler() { - from bb.event import getName - from bb import data - print("The name of the Event is %s" % getName(e)) - print("The file we run for is %s" % data.getVar('FILE', e.data, True)) - } - </literallayout> - </para> - - <para> - During a standard build, the following common events might occur: - <itemizedlist> - <listitem><para> - <filename>bb.event.ConfigParsed()</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.ParseStarted()</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.ParseProgress()</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.ParseCompleted()</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.BuildStarted()</filename> - </para></listitem> - <listitem><para> - <filename>bb.build.TaskStarted()</filename> - </para></listitem> - <listitem><para> - <filename>bb.build.TaskInvalid()</filename> - </para></listitem> - <listitem><para> - <filename>bb.build.TaskFailedSilent()</filename> - </para></listitem> - <listitem><para> - <filename>bb.build.TaskFailed()</filename> - </para></listitem> - <listitem><para> - <filename>bb.build.TaskSucceeded()</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.BuildCompleted()</filename> - </para></listitem> - <listitem><para> - <filename>bb.cooker.CookerExit()</filename> - </para></listitem> - </itemizedlist> - Here is a list of other events that occur based on specific requests - to the server: - <itemizedlist> - <listitem><para> - <filename>bb.event.TreeDataPreparationStarted()</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.TreeDataPreparationProgress</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.TreeDataPreparationCompleted</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.DepTreeGenerated</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.CoreBaseFilesFound</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.ConfigFilePathFound</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.FilesMatchingFound</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.ConfigFilesFound</filename> - </para></listitem> - <listitem><para> - <filename>bb.event.TargetsTreeGenerated</filename> - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id='variants-class-extension-mechanism'> - <title>Variants - Class Extension Mechanism</title> - - <para> - BitBake supports two features that facilitate creating - from a single recipe file multiple incarnations of that - recipe file where all incarnations are buildable. - These features are enabled through the - <link linkend='var-BBCLASSEXTEND'><filename>BBCLASSEXTEND</filename></link> - and - <link linkend='var-BBVERSIONS'><filename>BBVERSIONS</filename></link> - variables. - <note> - The mechanism for this class extension is extremely - specific to the implementation. - Usually, the recipe's - <link linkend='var-PROVIDES'><filename>PROVIDES</filename></link>, - <link linkend='var-PN'><filename>PN</filename></link>, and - <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link> - variables would need to be modified by the extension class. - For specific examples, see the OE-Core - <filename>native</filename>, <filename>nativesdk</filename>, - and <filename>multilib</filename> classes. - </note> - <itemizedlist> - <listitem><para><emphasis><filename>BBCLASSEXTEND</filename>:</emphasis> - This variable is a space separated list of classes used to "extend" the - recipe for each variant. - Here is an example that results in a second incarnation of the current - recipe being available. - This second incarnation will have the "native" class inherited. - <literallayout class='monospaced'> - BBCLASSEXTEND = "native" - </literallayout></para></listitem> - <listitem><para><emphasis><filename>BBVERSIONS</filename>:</emphasis> - This variable allows a single recipe to build multiple versions of a - project from a single recipe file. - You can also specify conditional metadata - (using the - <link linkend='var-OVERRIDES'><filename>OVERRIDES</filename></link> - mechanism) for a single version, or an optionally named range of versions. - Here is an example: - <literallayout class='monospaced'> - BBVERSIONS = "1.0 2.0 git" - SRC_URI_git = "git://someurl/somepath.git" - - BBVERSIONS = "1.0.[0-6]:1.0.0+ \ 1.0.[7-9]:1.0.7+" - SRC_URI_append_1.0.7+ = "file://some_patch_which_the_new_versions_need.patch;patch=1" - </literallayout> - The name of the range defaults to the original version of the - recipe. - For example, in OpenEmbedded, the recipe file - <filename>foo_1.0.0+.bb</filename> creates a default name range - of <filename>1.0.0+</filename>. - This is useful because the range name is not only placed - into overrides, but it is also made available for the metadata to use - in the variable that defines the base recipe versions for use in - <filename>file://</filename> search paths - (<link linkend='var-FILESPATH'><filename>FILESPATH</filename></link>). - </para></listitem> - </itemizedlist> - </para> - </section> - - <section id='dependencies'> - <title>Dependencies</title> - - <para> - To allow for efficient operation given multiple processes - executing in parallel, BitBake handles dependencies at - the task level. - BitBake supports a robust method to handle these dependencies. - </para> - - <para> - This section describes several types of dependency mechanisms. - </para> - - <section id='dependencies-internal-to-the-bb-file'> - <title>Dependencies Internal to the <filename>.bb</filename> File</title> - - <para> - BitBake uses the <filename>addtask</filename> directive - to manage dependencies that are internal to a given recipe - file. - You can use the <filename>addtask</filename> directive to - indicate when a task is dependent on other tasks or when - other tasks depend on that recipe. - Here is an example: - <literallayout class='monospaced'> - addtask printdate after do_fetch before do_build - </literallayout> - In this example, the <filename>printdate</filename> task is - depends on the completion of the <filename>do_fetch</filename> - task. - And, the <filename>do_build</filename> depends on the completion - of the <filename>printdate</filename> task. - </para> - </section> - - <section id='build-dependencies'> - <title>Build Dependencies</title> - - <para> - BitBake uses the - <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link> - variable to manage build time dependencies. - The "deptask" varflag for tasks signifies the task of each - item listed in <filename>DEPENDS</filename> that must - complete before that task can be executed. - Here is an example: - <literallayout class='monospaced'> - do_configure[deptask] = "do_populate_sysroot" - </literallayout> - In this example, the <filename>do_populate_sysroot</filename> - task of each item in <filename>DEPENDS</filename> must complete before - <filename>do_configure</filename> can execute. - </para> - </section> - - <section id='runtime-dependencies'> - <title>Runtime Dependencies</title> - - <para> - BitBake uses the - <link linkend='var-PACKAGES'><filename>PACKAGES</filename></link>, - <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>, and - <link linkend='var-RRECOMMENDS'><filename>RRECOMMENDS</filename></link> - variables to manage runtime dependencies. - </para> - - <para> - The <filename>PACKAGES</filename> variable lists runtime - packages. - Each of those packages can have <filename>RDEPENDS</filename> and - <filename>RRECOMMENDS</filename> runtime dependencies. - The "rdeptask" flag for tasks is used to signify the task of each - item runtime dependency which must have completed before that - task can be executed. - <literallayout class='monospaced'> - do_package_qa[rdeptask] = "do_packagedata" - </literallayout> - In the previous example, the <filename>do_packagedata</filename> - task of each item in <filename>RDEPENDS</filename> must have - completed before <filename>do_package_qa</filename> can execute. - </para> - </section> - - <section id='recursive-dependencies'> - <title>Recursive Dependencies</title> - - <para> - BitBake uses the "recrdeptask" flag to manage - recursive task dependencies. - BitBake looks through the build-time and runtime - dependencies of the current recipe, looks through - the task's inter-task - dependencies, and then adds dependencies for the - listed task. - Once BitBake has accomplished this, it recursively works through - the dependencies of those tasks. - Iterative passes continue until all dependencies are discovered - and added. - </para> - - <para> - You might want to not only have BitBake look for - dependencies of those tasks, but also have BitBake look - for build-time and runtime dependencies of the dependent - tasks as well. - If that is the case, you need to reference the task name - itself in the task list: - <literallayout class='monospaced'> - do_a[recrdeptask] = "do_a do_b" - </literallayout> - </para> - </section> - - <section id='inter-task-dependencies'> - <title>Inter-Task Dependencies</title> - - <para> - BitBake uses the "depends" flag in a more generic form - to manage inter-task dependencies. - This more generic form allows for inter-dependency - checks for specific tasks rather than checks for - the data in <filename>DEPENDS</filename>. - Here is an example: - <literallayout class='monospaced'> - do_patch[depends] = "quilt-native:do_populate_sysroot" - </literallayout> - In this example, the <filename>do_populate_sysroot</filename> - task of the target <filename>quilt-native</filename> - must have completed before the - <filename>do_patch</filename> task can execute. - </para> - - <para> - The "rdepends" flag works in a similar way but takes targets - in the runtime namespace instead of the build-time dependency - namespace. - </para> - </section> - </section> - - <section id='accessing-datastore-variables-using-python'> - <title>Accessing Datastore Variables Using Python</title> - - <para> - It is often necessary to access variables in the - BitBake datastore using Python functions. - The Bitbake datastore has an API that allows you this - access. - Here is a list of available operations: - </para> - - <para> - <informaltable frame='none'> - <tgroup cols='2' align='left' colsep='1' rowsep='1'> - <colspec colname='c1' colwidth='1*'/> - <colspec colname='c2' colwidth='1*'/> - <thead> - <row> - <entry align="left"><emphasis>Operation</emphasis></entry> - <entry align="left"><emphasis>Description</emphasis></entry> - </row> - </thead> - <tbody> - <row> - <entry align="left"><filename>d.getVar("X", expand=False)</filename></entry> - <entry align="left">Returns the value of variable "X". - Using "expand=True" expands the value.</entry> - </row> - <row> - <entry align="left"><filename>d.setVar("X", "value")</filename></entry> - <entry align="left">Sets the variable "X" to "value".</entry> - </row> - <row> - <entry align="left"><filename>d.appendVar("X", "value")</filename></entry> - <entry align="left">Adds "value" to the end of the variable "X".</entry> - </row> - <row> - <entry align="left"><filename>d.prependVar("X", "value")</filename></entry> - <entry align="left">Adds "value" to the start of the variable "X".</entry> - </row> - <row> - <entry align="left"><filename>d.delVar("X")</filename></entry> - <entry align="left">Deletes the variable "X" from the datastore.</entry> - </row> - <row> - <entry align="left"><filename>d.renameVar("X", "Y")</filename></entry> - <entry align="left">Renames the variable "X" to "Y".</entry> - </row> - <row> - <entry align="left"><filename>d.getVarFlag("X", flag, expand=False)</filename></entry> - <entry align="left">Gets then named flag from the variable "X". - Using "expand=True" expands the named flag.</entry> - </row> - <row> - <entry align="left"><filename>d.setVarFlag("X", flag, "value")</filename></entry> - <entry align="left">Sets the named flag for variable "X" to "value".</entry> - </row> - <row> - <entry align="left"><filename>d.appendVarFlag("X", flag, "value")</filename></entry> - <entry align="left">Appends "value" to the named flag on the - variable "X".</entry> - </row> - <row> - <entry align="left"><filename>d.prependVarFlag("X", flag, "value")</filename></entry> - <entry align="left">Prepends "value" to the named flag on - the variable "X".</entry> - </row> - <row> - <entry align="left"><filename>d.delVarFlag("X", flag)</filename></entry> - <entry align="left">Deletes the named flag on the variable - "X" from the datastore.</entry> - </row> - <row> - <entry align="left"><filename>d.setVarFlags("X", flagsdict)</filename></entry> - <entry align="left">Sets the flags specified in - the <filename>flagsdict()</filename> parameter. - <filename>setVarFlags</filename> does not clear previous flags. - Think of this operation as <filename>addVarFlags</filename>.</entry> - </row> - <row> - <entry align="left"><filename>d.getVarFlags("X")</filename></entry> - <entry align="left">Returns a <filename>flagsdict</filename> of the flags for - the variable "X".</entry> - </row> - <row> - <entry align="left"><filename>d.delVarFlags("X")</filename></entry> - <entry align="left">Deletes all the flags for the variable "X".</entry> - </row> - <row> - <entry align="left"><filename>d.expand(expression)</filename></entry> - <entry align="left">Expands variable references in the specified string expression.</entry> - </row> - </tbody> - </tgroup> - </informaltable> - </para> - </section> - - <section id='task-checksums-and-setscene'> - <title>Task Checksums and Setscene</title> - - <para> - BitBake uses checksums (or signatures) along with the setscene - to determine if a task needs to be run. - This section describes the process. - To help understand how BitBake does this, the section assumes an - OpenEmbedded metadata-based example. - </para> - - <para> - This list is a place holder of content existed from previous work - on the manual. - Some or all of it probably needs integrated into the subsections - that make up this section. - For now, I have just provided a short glossary-like description - for each variable. - Ultimately, this list goes away. - <itemizedlist> - <listitem><para><filename>STAMP</filename>: - The base path to create stamp files.</para></listitem> - <listitem><para><filename>STAMPCLEAN</filename> - Again, the base path to create stamp files but can use wildcards - for matching a range of files for clean operations. - </para></listitem> - <listitem><para><filename>BB_STAMP_WHITELIST</filename> - Lists stamp files that are looked at when the stamp policy - is "whitelist". - </para></listitem> - <listitem><para><filename>BB_STAMP_POLICY</filename> - Defines the mode for comparing timestamps of stamp files. - </para></listitem> - <listitem><para><filename>BB_HASHCHECK_FUNCTION</filename> - Specifies the name of the function to call during - the "setscene" part of the task's execution in order - to validate the list of task hashes. - </para></listitem> - <listitem><para><filename>BB_SETSCENE_VERIFY_FUNCTION</filename> - Specifies a function to call that verifies the list of - planned task execution before the main task execution - happens. - </para></listitem> - <listitem><para><filename>BB_SETSCENE_DEPVALID</filename> - Specifies a function BitBake calls that determines - whether BitBake requires a setscene dependency to - be met. - </para></listitem> - <listitem><para><filename>BB_TASKHASH</filename> - Within an executing task, this variable holds the hash - of the task as returned by the currently enabled - signature generator. - </para></listitem> - </itemizedlist> - </para> - </section> -</chapter> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml deleted file mode 100644 index ae7e4cee8..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml +++ /dev/null @@ -1,2319 +0,0 @@ -<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" -"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" -[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] > - -<!-- Dummy chapter --> -<chapter id='ref-variables-glos'> - -<title>Variables Glossary</title> - -<para> - This chapter lists common variables used by BitBake and gives an overview - of their function and contents. -</para> - -<note> - Following are some points regarding the variables listed in this glossary: - <itemizedlist> - <listitem><para>The variables listed in this glossary - are specific to BitBake. - Consequently, the descriptions are limited to that context. - </para></listitem> - <listitem><para>Also, variables exist in other systems that use BitBake - (e.g. The Yocto Project and OpenEmbedded) that have names identical - to those found in this glossary. - For such cases, the variables in those systems extend the - functionality of the variable as it is described here in - this glossary. - </para></listitem> - <listitem><para>Finally, there are variables mentioned in this - glossary that do not appear in the BitBake glossary. - These other variables are variables used in systems that use - BitBake. - </para></listitem> - </itemizedlist> -</note> - -<glossary id='ref-variables-glossary'> - - <para> - <link linkend='var-ASSUME_PROVIDED'>A</link> - <link linkend='var-B'>B</link> - <link linkend='var-CACHE'>C</link> - <link linkend='var-DEFAULT_PREFERENCE'>D</link> - <link linkend='var-EXCLUDE_FROM_WORLD'>E</link> - <link linkend='var-FAKEROOT'>F</link> - <link linkend='var-GITDIR'>G</link> - <link linkend='var-HGDIR'>H</link> -<!-- <link linkend='var-ICECC_DISABLED'>I</link> --> -<!-- <link linkend='var-glossary-j'>J</link> --> -<!-- <link linkend='var-KARCH'>K</link> --> - <link linkend='var-LAYERDEPENDS'>L</link> - <link linkend='var-MIRRORS'>M</link> -<!-- <link linkend='var-glossary-n'>N</link> --> - <link linkend='var-OVERRIDES'>O</link> - <link linkend='var-PACKAGES'>P</link> -<!-- <link linkend='var-QMAKE_PROFILES'>Q</link> --> - <link linkend='var-RDEPENDS'>R</link> - <link linkend='var-SECTION'>S</link> - <link linkend='var-T'>T</link> -<!-- <link linkend='var-UBOOT_CONFIG'>U</link> --> -<!-- <link linkend='var-glossary-v'>V</link> --> -<!-- <link linkend='var-WARN_QA'>W</link> --> -<!-- <link linkend='var-glossary-x'>X</link> --> -<!-- <link linkend='var-glossary-y'>Y</link> --> -<!-- <link linkend='var-glossary-z'>Z</link>--> - </para> - - <glossdiv id='var-glossary-a'><title>A</title> - - <glossentry id='var-ASSUME_PROVIDED'><glossterm>ASSUME_PROVIDED</glossterm> - <glossdef> - <para> - Lists recipe names - (<link linkend='var-PN'><filename>PN</filename></link> - values) BitBake does not attempt to build. - Instead, BitBake assumes these recipes have already been - built. - </para> - - <para> - In OpenEmbedded Core, <filename>ASSUME_PROVIDED</filename> - mostly specifies native tools that should not be built. - An example is <filename>git-native</filename>, which - when specified allows for the Git binary from the host to - be used rather than building - <filename>git-native</filename>. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - - <glossdiv id='var-glossary-b'><title>B</title> - - <glossentry id='var-B'><glossterm>B</glossterm> - <glossdef> - <para> - The directory in which BitBake executes functions - during a recipe's build process. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_ALLOWED_NETWORKS'><glossterm>BB_ALLOWED_NETWORKS</glossterm> - <glossdef> - <para> - Specifies a space-delimited list of hosts that the fetcher - is allowed to use to obtain the required source code. - Following are considerations surrounding this variable: - <itemizedlist> - <listitem><para> - This host list is only used if - <link linkend='var-BB_NO_NETWORK'><filename>BB_NO_NETWORK</filename></link> - is either not set or set to "0". - </para></listitem> - <listitem><para> - Limited support for wildcard matching against the - beginning of host names exists. - For example, the following setting matches - <filename>git.gnu.org</filename>, - <filename>ftp.gnu.org</filename>, and - <filename>foo.git.gnu.org</filename>. - <literallayout class='monospaced'> - BB_ALLOWED_NETWORKS = "*.gnu.org" - </literallayout> - </para></listitem> - <listitem><para> - Mirrors not in the host list are skipped and - logged in debug. - </para></listitem> - <listitem><para> - Attempts to access networks not in the host list - cause a failure. - </para></listitem> - </itemizedlist> - Using <filename>BB_ALLOWED_NETWORKS</filename> in - conjunction with - <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link> - is very useful. - Adding the host you want to use to - <filename>PREMIRRORS</filename> results in the source code - being fetched from an allowed location and avoids raising - an error when a host that is not allowed is in a - <link linkend='var-SRC_URI'><filename>SRC_URI</filename></link> - statement. - This is because the fetcher does not attempt to use the - host listed in <filename>SRC_URI</filename> after a - successful fetch from the - <filename>PREMIRRORS</filename> occurs. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_CONSOLELOG'><glossterm>BB_CONSOLELOG</glossterm> - <glossdef> - <para> - Specifies the path to a log file into which BitBake's user - interface writes output during the build. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_CURRENTTASK'><glossterm>BB_CURRENTTASK</glossterm> - <glossdef> - <para> - Contains the name of the currently running task. - The name does not include the - <filename>do_</filename> prefix. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_DANGLINGAPPENDS_WARNONLY'><glossterm>BB_DANGLINGAPPENDS_WARNONLY</glossterm> - <glossdef> - <para> - Defines how BitBake handles situations where an append - file (<filename>.bbappend</filename>) has no - corresponding recipe file (<filename>.bb</filename>). - This condition often occurs when layers get out of sync - (e.g. <filename>oe-core</filename> bumps a - recipe version and the old recipe no longer exists and the - other layer has not been updated to the new version - of the recipe yet). - </para> - - <para> - The default fatal behavior is safest because it is - the sane reaction given something is out of sync. - It is important to realize when your changes are no longer - being applied. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_DEFAULT_TASK'><glossterm>BB_DEFAULT_TASK</glossterm> - <glossdef> - <para> - The default task to use when none is specified (e.g. - with the <filename>-c</filename> command line option). - The task name specified should not include the - <filename>do_</filename> prefix. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_DISKMON_DIRS'><glossterm>BB_DISKMON_DIRS</glossterm> - <glossdef> - <para> - Monitors disk space and available inodes during the build - and allows you to control the build based on these - parameters. - </para> - - <para> - Disk space monitoring is disabled by default. - When setting this variable, use the following form: - <literallayout class='monospaced'> - BB_DISKMON_DIRS = "<action>,<dir>,<threshold> [...]" - - where: - - <action> is: - ABORT: Immediately abort the build when - a threshold is broken. - STOPTASKS: Stop the build after the currently - executing tasks have finished when - a threshold is broken. - WARN: Issue a warning but continue the - build when a threshold is broken. - Subsequent warnings are issued as - defined by the - <link linkend='var-BB_DISKMON_WARNINTERVAL'>BB_DISKMON_WARNINTERVAL</link> variable, - which must be defined. - - <dir> is: - Any directory you choose. You can specify one or - more directories to monitor by separating the - groupings with a space. If two directories are - on the same device, only the first directory - is monitored. - - <threshold> is: - Either the minimum available disk space, - the minimum number of free inodes, or - both. You must specify at least one. To - omit one or the other, simply omit the value. - Specify the threshold using G, M, K for Gbytes, - Mbytes, and Kbytes, respectively. If you do - not specify G, M, or K, Kbytes is assumed by - default. Do not use GB, MB, or KB. - </literallayout> - </para> - - <para> - Here are some examples: - <literallayout class='monospaced'> - BB_DISKMON_DIRS = "ABORT,${TMPDIR},1G,100K WARN,${SSTATE_DIR},1G,100K" - BB_DISKMON_DIRS = "STOPTASKS,${TMPDIR},1G" - BB_DISKMON_DIRS = "ABORT,${TMPDIR},,100K" - </literallayout> - The first example works only if you also set - the <link linkend='var-BB_DISKMON_WARNINTERVAL'><filename>BB_DISKMON_WARNINTERVAL</filename></link> variable. - This example causes the build system to immediately - abort when either the disk space in <filename>${TMPDIR}</filename> drops - below 1 Gbyte or the available free inodes drops below - 100 Kbytes. - Because two directories are provided with the variable, the - build system also issues a - warning when the disk space in the - <filename>${SSTATE_DIR}</filename> directory drops - below 1 Gbyte or the number of free inodes drops - below 100 Kbytes. - Subsequent warnings are issued during intervals as - defined by the <filename>BB_DISKMON_WARNINTERVAL</filename> - variable. - </para> - - <para> - The second example stops the build after all currently - executing tasks complete when the minimum disk space - in the <filename>${TMPDIR}</filename> - directory drops below 1 Gbyte. - No disk monitoring occurs for the free inodes in this case. - </para> - - <para> - The final example immediately aborts the build when the - number of free inodes in the <filename>${TMPDIR}</filename> directory - drops below 100 Kbytes. - No disk space monitoring for the directory itself occurs - in this case. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_DISKMON_WARNINTERVAL'><glossterm>BB_DISKMON_WARNINTERVAL</glossterm> - <glossdef> - <para> - Defines the disk space and free inode warning intervals. - </para> - - <para> - If you are going to use the - <filename>BB_DISKMON_WARNINTERVAL</filename> variable, you must - also use the - <link linkend='var-BB_DISKMON_DIRS'><filename>BB_DISKMON_DIRS</filename></link> variable - and define its action as "WARN". - During the build, subsequent warnings are issued each time - disk space or number of free inodes further reduces by - the respective interval. - </para> - - <para> - If you do not provide a <filename>BB_DISKMON_WARNINTERVAL</filename> - variable and you do use <filename>BB_DISKMON_DIRS</filename> with - the "WARN" action, the disk monitoring interval defaults to - the following: - <literallayout class='monospaced'> - BB_DISKMON_WARNINTERVAL = "50M,5K" - </literallayout> - </para> - - <para> - When specifying the variable in your configuration file, - use the following form: - <literallayout class='monospaced'> - BB_DISKMON_WARNINTERVAL = "<disk_space_interval>,<disk_inode_interval>" - - where: - - <disk_space_interval> is: - An interval of memory expressed in either - G, M, or K for Gbytes, Mbytes, or Kbytes, - respectively. You cannot use GB, MB, or KB. - - <disk_inode_interval> is: - An interval of free inodes expressed in either - G, M, or K for Gbytes, Mbytes, or Kbytes, - respectively. You cannot use GB, MB, or KB. - </literallayout> - </para> - - <para> - Here is an example: - <literallayout class='monospaced'> - BB_DISKMON_DIRS = "WARN,${SSTATE_DIR},1G,100K" - BB_DISKMON_WARNINTERVAL = "50M,5K" - </literallayout> - These variables cause BitBake to - issue subsequent warnings each time the available - disk space further reduces by 50 Mbytes or the number - of free inodes further reduces by 5 Kbytes in the - <filename>${SSTATE_DIR}</filename> directory. - Subsequent warnings based on the interval occur each time - a respective interval is reached beyond the initial warning - (i.e. 1 Gbytes and 100 Kbytes). - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_ENV_WHITELIST'><glossterm>BB_ENV_WHITELIST</glossterm> - <glossdef> - <para> - Specifies the internal whitelist of variables to allow - through from the external environment into BitBake's - datastore. - If the value of this variable is not specified - (which is the default), the following list is used: - <link linkend='var-BBPATH'><filename>BBPATH</filename></link>, - <link linkend='var-BB_PRESERVE_ENV'><filename>BB_PRESERVE_ENV</filename></link>, - <link linkend='var-BB_ENV_WHITELIST'><filename>BB_ENV_WHITELIST</filename></link>, - and - <link linkend='var-BB_ENV_EXTRAWHITE'><filename>BB_ENV_EXTRAWHITE</filename></link>. - <note> - You must set this variable in the external environment - in order for it to work. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_ENV_EXTRAWHITE'><glossterm>BB_ENV_EXTRAWHITE</glossterm> - <glossdef> - <para> - Specifies an additional set of variables to allow through - (whitelist) from the external environment into BitBake's - datastore. - This list of variables are on top of the internal list - set in - <link linkend='var-BB_ENV_WHITELIST'><filename>BB_ENV_WHITELIST</filename></link>. - <note> - You must set this variable in the external - environment in order for it to work. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_FETCH_PREMIRRORONLY'><glossterm>BB_FETCH_PREMIRRORONLY</glossterm> - <glossdef> - <para> - When set to "1", causes BitBake's fetcher module to only - search - <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link> - for files. - BitBake will not search the main - <link linkend='var-SRC_URI'><filename>SRC_URI</filename></link> - or - <link linkend='var-MIRRORS'><filename>MIRRORS</filename></link>. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_FILENAME'><glossterm>BB_FILENAME</glossterm> - <glossdef> - <para> - Contains the filename of the recipe that owns the currently - running task. - For example, if the <filename>do_fetch</filename> task that - resides in the <filename>my-recipe.bb</filename> is - executing, the <filename>BB_FILENAME</filename> variable - contains "/foo/path/my-recipe.bb". - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_GENERATE_MIRROR_TARBALLS'><glossterm>BB_GENERATE_MIRROR_TARBALLS</glossterm> - <glossdef> - <para> - Causes tarballs of the Git repositories, including the - Git metadata, to be placed in the - <link linkend='var-DL_DIR'><filename>DL_DIR</filename></link> - directory. - Anyone wishing to create a source mirror would want to - enable this variable. - </para> - - <para> - For performance reasons, creating and placing tarballs of - the Git repositories is not the default action by BitBake. - <literallayout class='monospaced'> - BB_GENERATE_MIRROR_TARBALLS = "1" - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_HASHCONFIG_WHITELIST'><glossterm>BB_HASHCONFIG_WHITELIST</glossterm> - <glossdef> - <para> - Lists variables that are excluded from base configuration - checksum, which is used to determine if the cache can - be reused. - </para> - - <para> - One of the ways BitBake determines whether to re-parse the - main metadata is through checksums of the variables in the - datastore of the base configuration data. - There are variables that you typically want to exclude when - checking whether or not to re-parse and thus rebuild the - cache. - As an example, you would usually exclude - <filename>TIME</filename> and <filename>DATE</filename> - because these variables are always changing. - If you did not exclude them, BitBake would never reuse the - cache. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_HASHBASE_WHITELIST'><glossterm>BB_HASHBASE_WHITELIST</glossterm> - <glossdef> - <para> - Lists variables that are excluded from checksum and - dependency data. - Variables that are excluded can therefore change without - affecting the checksum mechanism. - A common example would be the variable for the path of - the build. - BitBake's output should not (and usually does not) depend - on the directory in which it was built. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_HASHCHECK_FUNCTION'><glossterm>BB_HASHCHECK_FUNCTION</glossterm> - <glossdef> - <para> - Specifies the name of the function to call during the - "setscene" part of the task's execution in order to - validate the list of task hashes. - The function returns the list of setscene tasks that should - be executed. - </para> - - <para> - At this point in the execution of the code, the objective - is to quickly verify if a given setscene function is likely - to work or not. - It's easier to check the list of setscene functions in - one pass than to call many individual tasks. - The returned list need not be completely accurate. - A given setscene task can still later fail. - However, the more accurate the data returned, the more - efficient the build will be. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_INVALIDCONF'><glossterm>BB_INVALIDCONF</glossterm> - <glossdef> - <para> - Used in combination with the - <filename>ConfigParsed</filename> event to trigger - re-parsing the base metadata (i.e. all the - recipes). - The <filename>ConfigParsed</filename> event can set the - variable to trigger the re-parse. - You must be careful to avoid recursive loops with this - functionality. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_LOGFMT'><glossterm>BB_LOGFMT</glossterm> - <glossdef> - <para> - Specifies the name of the log files saved into - <filename>${</filename><link linkend='var-T'><filename>T</filename></link><filename>}</filename>. - By default, the <filename>BB_LOGFMT</filename> variable - is undefined and the log file names get created using the - following form: - <literallayout class='monospaced'> - log.{task}.{pid} - </literallayout> - If you want to force log files to take a specific name, - you can set this variable in a configuration file. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_NICE_LEVEL'><glossterm>BB_NICE_LEVEL</glossterm> - <glossdef> - <para> - Allows BitBake to run at a specific priority - (i.e. nice level). - System permissions usually mean that BitBake can reduce its - priority but not raise it again. - See - <link linkend='var-BB_TASK_NICE_LEVEL'><filename>BB_TASK_NICE_LEVEL</filename></link> - for additional information. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_NO_NETWORK'><glossterm>BB_NO_NETWORK</glossterm> - <glossdef> - <para> - Disables network access in the BitBake fetcher modules. - With this access disabled, any command that attempts to - access the network becomes an error. - </para> - - <para> - Disabling network access is useful for testing source - mirrors, running builds when not connected to the Internet, - and when operating in certain kinds of firewall - environments. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_NUMBER_THREADS'><glossterm>BB_NUMBER_THREADS</glossterm> - <glossdef> - <para> - The maximum number of tasks BitBake should run in parallel - at any one time. - If your host development system supports multiple cores, - a good rule of thumb is to set this variable to twice the - number of cores. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_NUMBER_PARSE_THREADS'><glossterm>BB_NUMBER_PARSE_THREADS</glossterm> - <glossdef> - <para> - Sets the number of threads BitBake uses when parsing. - By default, the number of threads is equal to the number - of cores on the system. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_ORIGENV'><glossterm>BB_ORIGENV</glossterm> - <glossdef> - <para> - Contains a copy of the original external environment in - which BitBake was run. - The copy is taken before any whitelisted variable values - are filtered into BitBake's datastore. - <note> - The contents of this variable is a datastore object - that can be queried using the normal datastore - operations. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_PRESERVE_ENV'><glossterm>BB_PRESERVE_ENV</glossterm> - <glossdef> - <para> - Disables whitelisting and instead allows all variables - through from the external environment into BitBake's - datastore. - <note> - You must set this variable in the external - environment in order for it to work. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_RUNFMT'><glossterm>BB_RUNFMT</glossterm> - <glossdef> - <para> - Specifies the name of the executable script files - (i.e. run files) saved into - <filename>${</filename><link linkend='var-T'><filename>T</filename></link><filename>}</filename>. - By default, the <filename>BB_RUNFMT</filename> variable - is undefined and the run file names get created using the - following form: - <literallayout class='monospaced'> - run.{task}.{pid} - </literallayout> - If you want to force run files to take a specific name, - you can set this variable in a configuration file. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_RUNTASK'><glossterm>BB_RUNTASK</glossterm> - <glossdef> - <para> - Contains the name of the currently executing task. - The value does not include the "do_" prefix. - For example, if the currently executing task is - <filename>do_config</filename>, the value is - "config". - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SCHEDULER'><glossterm>BB_SCHEDULER</glossterm> - <glossdef> - <para> - Selects the name of the scheduler to use for the - scheduling of BitBake tasks. - Three options exist: - <itemizedlist> - <listitem><para><emphasis>basic</emphasis> - - The basic framework from which everything derives. - Using this option causes tasks to be ordered - numerically as they are parsed. - </para></listitem> - <listitem><para><emphasis>speed</emphasis> - - Executes tasks first that have more tasks - depending on them. - The "speed" option is the default. - </para></listitem> - <listitem><para><emphasis>completion</emphasis> - - Causes the scheduler to try to complete a given - recipe once its build has started. - </para></listitem> - </itemizedlist> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SCHEDULERS'><glossterm>BB_SCHEDULERS</glossterm> - <glossdef> - <para> - Defines custom schedulers to import. - Custom schedulers need to be derived from the - <filename>RunQueueScheduler</filename> class. - </para> - - <para> - For information how to select a scheduler, see the - <link linkend='var-BB_SCHEDULER'><filename>BB_SCHEDULER</filename></link> - variable. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SETSCENE_DEPVALID'><glossterm>BB_SETSCENE_DEPVALID</glossterm> - <glossdef> - <para> - Specifies a function BitBake calls that determines - whether BitBake requires a setscene dependency to be met. - </para> - - <para> - When running a setscene task, BitBake needs to - know which dependencies of that setscene task also need - to be run. - Whether dependencies also need to be run is highly - dependent on the metadata. - The function specified by this variable returns a - "True" or "False" depending on whether the dependency needs - to be met. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SETSCENE_VERIFY_FUNCTION'><glossterm>BB_SETSCENE_VERIFY_FUNCTION</glossterm> - <glossdef> - <para> - Specifies a function to call that verifies the list of - planned task execution before the main task execution - happens. - The function is called once BitBake has a list of setscene - tasks that have run and either succeeded or failed. - </para> - - <para> - The function allows for a task list check to see if they - make sense. - Even if BitBake was planning to skip a task, the - returned value of the function can force BitBake to run - the task, which is necessary under certain metadata - defined circumstances. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SIGNATURE_EXCLUDE_FLAGS'><glossterm>BB_SIGNATURE_EXCLUDE_FLAGS</glossterm> - <glossdef> - <para> - Lists variable flags (varflags) - that can be safely excluded from checksum - and dependency data for keys in the datastore. - When generating checksum or dependency data for keys in the - datastore, the flags set against that key are normally - included in the checksum. - </para> - - <para> - For more information on varflags, see the - "<link linkend='variable-flags'>Variable Flags</link>" - section. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SIGNATURE_HANDLER'><glossterm>BB_SIGNATURE_HANDLER</glossterm> - <glossdef> - <para> - Defines the name of the signature handler BitBake uses. - The signature handler defines the way stamp files are - created and handled, if and how the signature is - incorporated into the stamps, and how the signature - itself is generated. - </para> - - <para> - A new signature handler can be added by injecting a class - derived from the - <filename>SignatureGenerator</filename> class into the - global namespace. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_SRCREV_POLICY'><glossterm>BB_SRCREV_POLICY</glossterm> - <glossdef> - <para> - Defines the behavior of the fetcher when it interacts with - source control systems and dynamic source revisions. - The <filename>BB_SRCREV_POLICY</filename> variable is - useful when working without a network. - </para> - - <para> - The variable can be set using one of two policies: - <itemizedlist> - <listitem><para><emphasis>cache</emphasis> - - Retains the value the system obtained previously - rather than querying the source control system - each time. - </para></listitem> - <listitem><para><emphasis>clear</emphasis> - - Queries the source controls system every time. - With this policy, there is no cache. - The "clear" policy is the default. - </para></listitem> - </itemizedlist> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_STAMP_POLICY'><glossterm>BB_STAMP_POLICY</glossterm> - <glossdef> - <para> - Defines the mode used for how timestamps of stamp files - are compared. - You can set the variable to one of the following modes: - <itemizedlist> - <listitem><para><emphasis>perfile</emphasis> - - Timestamp comparisons are only made - between timestamps of a specific recipe. - This is the default mode. - </para></listitem> - <listitem><para><emphasis>full</emphasis> - - Timestamp comparisons are made for all - dependencies. - </para></listitem> - <listitem><para><emphasis>whitelist</emphasis> - - Identical to "full" mode except timestamp - comparisons are made for recipes listed in the - <link linkend='var-BB_STAMP_WHITELIST'><filename>BB_STAMP_WHITELIST</filename></link> - variable. - </para></listitem> - </itemizedlist> - <note> - Stamp policies are largely obsolete with the - introduction of setscene tasks. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_STAMP_WHITELIST'><glossterm>BB_STAMP_WHITELIST</glossterm> - <glossdef> - <para> - Lists files whose stamp file timestamps are compared when - the stamp policy mode is set to "whitelist". - For information on stamp policies, see the - <link linkend='var-BB_STAMP_POLICY'><filename>BB_STAMP_POLICY</filename></link> - variable. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_STRICT_CHECKSUM'><glossterm>BB_STRICT_CHECKSUM</glossterm> - <glossdef> - <para> - Sets a more strict checksum mechanism for non-local URLs. - Setting this variable to a value causes BitBake - to report an error if it encounters a non-local URL - that does not have at least one checksum specified. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_TASK_IONICE_LEVEL'><glossterm>BB_TASK_IONICE_LEVEL</glossterm> - <glossdef> - <para> - Allows adjustment of a task's Input/Output priority. - During Autobuilder testing, random failures can occur - for tasks due to I/O starvation. - These failures occur during various QEMU runtime timeouts. - You can use the <filename>BB_TASK_IONICE_LEVEL</filename> - variable to adjust the I/O priority of these tasks. - <note> - This variable works similarly to the - <link linkend='var-BB_TASK_NICE_LEVEL'><filename>BB_TASK_NICE_LEVEL</filename></link> - variable except with a task's I/O priorities. - </note> - </para> - - <para> - Set the variable as follows: - <literallayout class='monospaced'> - BB_TASK_IONICE_LEVEL = "<replaceable>class</replaceable>.<replaceable>prio</replaceable>" - </literallayout> - For <replaceable>class</replaceable>, the default value is - "2", which is a best effort. - You can use "1" for realtime and "3" for idle. - If you want to use realtime, you must have superuser - privileges. - </para> - - <para> - For <replaceable>prio</replaceable>, you can use any - value from "0", which is the highest priority, to "7", - which is the lowest. - The default value is "4". - You do not need any special privileges to use this range - of priority values. - <note> - In order for your I/O priority settings to take effect, - you need the Completely Fair Queuing (CFQ) Scheduler - selected for the backing block device. - To select the scheduler, use the following command form - where <replaceable>device</replaceable> is the device - (e.g. sda, sdb, and so forth): - <literallayout class='monospaced'> - $ sudo sh -c “echo cfq > /sys/block/<replaceable>device</replaceable>/queu/scheduler - </literallayout> - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_TASK_NICE_LEVEL'><glossterm>BB_TASK_NICE_LEVEL</glossterm> - <glossdef> - <para> - Allows specific tasks to change their priority - (i.e. nice level). - </para> - - <para> - You can use this variable in combination with task - overrides to raise or lower priorities of specific tasks. - For example, on the - <ulink url='http://www.yoctoproject.org'>Yocto Project</ulink> - autobuilder, QEMU emulation in images is given a higher - priority as compared to build tasks to ensure that images - do not suffer timeouts on loaded systems. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_TASKHASH'><glossterm>BB_TASKHASH</glossterm> - <glossdef> - <para> - Within an executing task, this variable holds the hash - of the task as returned by the currently enabled - signature generator. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_VERBOSE_LOGS'><glossterm>BB_VERBOSE_LOGS</glossterm> - <glossdef> - <para> - Controls how verbose BitBake is during builds. - If set, shell scripts echo commands and shell script output - appears on standard out (stdout). - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BB_WORKERCONTEXT'><glossterm>BB_WORKERCONTEXT</glossterm> - <glossdef> - <para> - Specifies if the current context is executing a task. - BitBake sets this variable to "1" when a task is - being executed. - The value is not set when the task is in server context - during parsing or event handling. - </para> - </glossdef> - </glossentry> - - - <glossentry id='var-BBCLASSEXTEND'><glossterm>BBCLASSEXTEND</glossterm> - <glossdef> - <para> - Allows you to extend a recipe so that it builds variants - of the software. - Some examples of these variants for recipes from the - OpenEmbedded Core metadata are "natives" such as - <filename>quilt-native</filename>, which is a copy of - Quilt built to run on the build system; "crosses" such - as <filename>gcc-cross</filename>, which is a compiler - built to run on the build machine but produces binaries - that run on the target <filename>MACHINE</filename>; - "nativesdk", which targets the SDK machine instead of - <filename>MACHINE</filename>; and "mulitlibs" in the form - "<filename>multilib:</filename><replaceable>multilib_name</replaceable>". - </para> - - <para> - To build a different variant of the recipe with a minimal - amount of code, it usually is as simple as adding the - variable to your recipe. - Here are two examples. - The "native" variants are from the OpenEmbedded Core - metadata: - <literallayout class='monospaced'> - BBCLASSEXTEND =+ "native nativesdk" - BBCLASSEXTEND =+ "multilib:<replaceable>multilib_name</replaceable>" - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBDEBUG'><glossterm>BBDEBUG</glossterm> - <glossdef> - <para> - Sets the BitBake debug output level to a specific value - as incremented by the <filename>-d</filename> command line - option. - <note> - You must set this variable in the external environment - in order for it to work. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBFILE_COLLECTIONS'><glossterm>BBFILE_COLLECTIONS</glossterm> - <glossdef> - <para>Lists the names of configured layers. - These names are used to find the other <filename>BBFILE_*</filename> - variables. - Typically, each layer appends its name to this variable in its - <filename>conf/layer.conf</filename> file. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBFILE_PATTERN'><glossterm>BBFILE_PATTERN</glossterm> - <glossdef> - <para>Variable that expands to match files from - <link linkend='var-BBFILES'><filename>BBFILES</filename></link> - in a particular layer. - This variable is used in the <filename>conf/layer.conf</filename> file and must - be suffixed with the name of the specific layer (e.g. - <filename>BBFILE_PATTERN_emenlow</filename>).</para> - </glossdef> - </glossentry> - - <glossentry id='var-BBFILE_PRIORITY'><glossterm>BBFILE_PRIORITY</glossterm> - <glossdef> - <para>Assigns the priority for recipe files in each layer.</para> - <para>This variable is useful in situations where the same recipe appears in - more than one layer. - Setting this variable allows you to prioritize a - layer against other layers that contain the same recipe - effectively - letting you control the precedence for the multiple layers. - The precedence established through this variable stands regardless of a - recipe's version - (<link linkend='var-PV'><filename>PV</filename></link> variable). - For example, a layer that has a recipe with a higher <filename>PV</filename> value but for - which the <filename>BBFILE_PRIORITY</filename> is set to have a lower precedence still has a - lower precedence.</para> - <para>A larger value for the <filename>BBFILE_PRIORITY</filename> variable results in a higher - precedence. - For example, the value 6 has a higher precedence than the value 5. - If not specified, the <filename>BBFILE_PRIORITY</filename> variable is set based on layer - dependencies (see the - <filename><link linkend='var-LAYERDEPENDS'>LAYERDEPENDS</link></filename> variable for - more information. - The default priority, if unspecified - for a layer with no dependencies, is the lowest defined priority + 1 - (or 1 if no priorities are defined).</para> - <tip> - You can use the command <filename>bitbake-layers show-layers</filename> to list - all configured layers along with their priorities. - </tip> - </glossdef> - </glossentry> - - <glossentry id='var-BBFILES'><glossterm>BBFILES</glossterm> - <glossdef> - <para>List of recipe files BitBake uses to build software.</para> - </glossdef> - </glossentry> - - <glossentry id='var-BBINCLUDED'><glossterm>BBINCLUDED</glossterm> - <glossdef> - <para> - Contains a space-separated list of all of all files that - BitBake's parser included during parsing of the current - file. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBINCLUDELOGS'><glossterm>BBINCLUDELOGS</glossterm> - <glossdef> - <para> - If set to a value, enables printing the task log when - reporting a failed task. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBINCLUDELOGS_LINES'><glossterm>BBINCLUDELOGS_LINES</glossterm> - <glossdef> - <para> - If - <link linkend='var-BBINCLUDELOGS'><filename>BBINCLUDELOGS</filename></link> - is set, specifies the maximum number of lines from the - task log file to print when reporting a failed task. - If you do not set <filename>BBINCLUDELOGS_LINES</filename>, - the entire log is printed. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBLAYERS'><glossterm>BBLAYERS</glossterm> - <glossdef> - <para>Lists the layers to enable during the build. - This variable is defined in the <filename>bblayers.conf</filename> configuration - file in the build directory. - Here is an example: - <literallayout class='monospaced'> - BBLAYERS = " \ - /home/scottrif/poky/meta \ - /home/scottrif/poky/meta-yocto \ - /home/scottrif/poky/meta-yocto-bsp \ - /home/scottrif/poky/meta-mykernel \ - " - - </literallayout> - This example enables four layers, one of which is a custom, user-defined layer - named <filename>meta-mykernel</filename>. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBLAYERS_FETCH_DIR'><glossterm>BBLAYERS_FETCH_DIR</glossterm> - <glossdef> - <para> - Sets the base location where layers are stored. - By default, this location is set to - <filename>${COREBASE}</filename>. - This setting is used in conjunction with - <filename>bitbake-layers layerindex-fetch</filename> and - tells <filename>bitbake-layers</filename> where to place - the fetched layers. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBMASK'><glossterm>BBMASK</glossterm> - <glossdef> - <para> - Prevents BitBake from processing recipes and recipe - append files. - </para> - - <para> - You can use the <filename>BBMASK</filename> variable - to "hide" these <filename>.bb</filename> and - <filename>.bbappend</filename> files. - BitBake ignores any recipe or recipe append files that - match any of the expressions. - It is as if BitBake does not see them at all. - Consequently, matching files are not parsed or otherwise - used by BitBake.</para> - <para> - The values you provide are passed to Python's regular - expression compiler. - The expressions are compared against the full paths to - the files. - For complete syntax information, see Python's - documentation at - <ulink url='http://docs.python.org/release/2.3/lib/re-syntax.html'></ulink>. - </para> - - <para> - The following example uses a complete regular expression - to tell BitBake to ignore all recipe and recipe append - files in the <filename>meta-ti/recipes-misc/</filename> - directory: - <literallayout class='monospaced'> - BBMASK = "meta-ti/recipes-misc/" - </literallayout> - If you want to mask out multiple directories or recipes, - you can specify multiple regular expression fragments. - This next example masks out multiple directories and - individual recipes: - <literallayout class='monospaced'> - BBMASK += "/meta-ti/recipes-misc/ meta-ti/recipes-ti/packagegroup/" - BBMASK += "/meta-oe/recipes-support/" - BBMASK += "/meta-foo/.*/openldap" - BBMASK += "opencv.*\.bbappend" - BBMASK += "lzma" - </literallayout> - <note> - When specifying a directory name, use the trailing - slash character to ensure you match just that directory - name. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBPATH'><glossterm>BBPATH</glossterm> - <glossdef> - <para> - Used by BitBake to locate class - (<filename>.bbclass</filename>) and configuration - (<filename>.conf</filename>) files. - This variable is analogous to the - <filename>PATH</filename> variable. - </para> - - <para> - If you run BitBake from a directory outside of the - build directory, - you must be sure to set - <filename>BBPATH</filename> to point to the - build directory. - Set the variable as you would any environment variable - and then run BitBake: - <literallayout class='monospaced'> - $ BBPATH="<replaceable>build_directory</replaceable>" - $ export BBPATH - $ bitbake <replaceable>target</replaceable> - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBSERVER'><glossterm>BBSERVER</glossterm> - <glossdef> - <para> - Points to the server that runs memory-resident BitBake. - The variable is only used when you employ memory-resident - BitBake. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBTARGETS'><glossterm>BBTARGETS</glossterm> - <glossdef> - <para> - Allows you to use a configuration file to add to the list - of command-line target recipes you want to build. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BBVERSIONS'><glossterm>BBVERSIONS</glossterm> - <glossdef> - <para> - Allows a single recipe to build multiple versions of a - project from a single recipe file. - You also able to specify conditional metadata - using the - <link linkend='var-OVERRIDES'><filename>OVERRIDES</filename></link> - mechanism for a single version or for an optionally named - range of versions. - </para> - - <para> - For more information on <filename>BBVERSIONS</filename>, - see the - "<link linkend='variants-class-extension-mechanism'>Variants - Class Extension Mechanism</link>" - section. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BITBAKE_UI'><glossterm>BITBAKE_UI</glossterm> - <glossdef> - <para> - Used to specify the UI module to use when running BitBake. - Using this variable is equivalent to using the - <filename>-u</filename> command-line option. - <note> - You must set this variable in the external environment - in order for it to work. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BUILDNAME'><glossterm>BUILDNAME</glossterm> - <glossdef> - <para> - A name assigned to the build. - The name defaults to a datetime stamp of when the build was - started but can be defined by the metadata. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-BZRDIR'><glossterm>BZRDIR</glossterm> - <glossdef> - <para> - The directory in which files checked out of a Bazaar - system are stored. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-c'><title>C</title> - - <glossentry id='var-CACHE'><glossterm>CACHE</glossterm> - <glossdef> - <para> - Specifies the directory BitBake uses to store a cache - of the metadata so it does not need to be parsed every - time BitBake is started. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-CVSDIR'><glossterm>CVSDIR</glossterm> - <glossdef> - <para> - The directory in which files checked out under the - CVS system are stored. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-d'><title>D</title> - - <glossentry id='var-DEFAULT_PREFERENCE'><glossterm>DEFAULT_PREFERENCE</glossterm> - <glossdef> - <para> - Specifies a weak bias for recipe selection priority. - </para> - <para> - The most common usage of this is variable is to set - it to "-1" within a recipe for a development version of a - piece of software. - Using the variable in this way causes the stable version - of the recipe to build by default in the absence of - <filename><link linkend='var-PREFERRED_VERSION'>PREFERRED_VERSION</link></filename> - being used to build the development version. - </para> - <note> - The bias provided by <filename>DEFAULT_PREFERENCE</filename> - is weak and is overridden by - <filename><link linkend='var-BBFILE_PRIORITY'>BBFILE_PRIORITY</link></filename> - if that variable is different between two layers - that contain different versions of the same recipe. - </note> - </glossdef> - </glossentry> - - <glossentry id='var-DEPENDS'><glossterm>DEPENDS</glossterm> - <glossdef> - <para> - Lists a recipe's build-time dependencies - (i.e. other recipe files). - </para> - - <para> - Consider this simple example for two recipes named "a" and - "b" that produce similarly named packages. - In this example, the <filename>DEPENDS</filename> - statement appears in the "a" recipe: - <literallayout class='monospaced'> - DEPENDS = "b" - </literallayout> - Here, the dependency is such that the - <filename>do_configure</filename> task for recipe "a" - depends on the <filename>do_populate_sysroot</filename> - task of recipe "b". - This means anything that recipe "b" puts into sysroot - is available when recipe "a" is configuring itself. - </para> - - <para> - For information on runtime dependencies, see the - <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> - variable. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-DESCRIPTION'><glossterm>DESCRIPTION</glossterm> - <glossdef> - <para> - A long description for the recipe. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-DL_DIR'><glossterm>DL_DIR</glossterm> - <glossdef> - <para> - The central download directory used by the build process to - store downloads. - By default, <filename>DL_DIR</filename> gets files - suitable for mirroring for everything except Git - repositories. - If you want tarballs of Git repositories, use the - <link linkend='var-BB_GENERATE_MIRROR_TARBALLS'><filename>BB_GENERATE_MIRROR_TARBALLS</filename></link> - variable. - </para> - </glossdef> - - </glossentry> - </glossdiv> - - <glossdiv id='var-glossary-e'><title>E</title> - - <glossentry id='var-EXCLUDE_FROM_WORLD'><glossterm>EXCLUDE_FROM_WORLD</glossterm> - <glossdef> - <para> - Directs BitBake to exclude a recipe from world builds (i.e. - <filename>bitbake world</filename>). - During world builds, BitBake locates, parses and builds all - recipes found in every layer exposed in the - <filename>bblayers.conf</filename> configuration file. - </para> - - <para> - To exclude a recipe from a world build using this variable, - set the variable to "1" in the recipe. - </para> - - <note> - Recipes added to <filename>EXCLUDE_FROM_WORLD</filename> - may still be built during a world build in order to satisfy - dependencies of other recipes. - Adding a recipe to <filename>EXCLUDE_FROM_WORLD</filename> - only ensures that the recipe is not explicitly added - to the list of build targets in a world build. - </note> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-f'><title>F</title> - - <glossentry id='var-FAKEROOT'><glossterm>FAKEROOT</glossterm> - <glossdef> - <para> - Contains the command to use when running a shell script - in a fakeroot environment. - The <filename>FAKEROOT</filename> variable is obsolete - and has been replaced by the other - <filename>FAKEROOT*</filename> variables. - See these entries in the glossary for more information. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FAKEROOTBASEENV'><glossterm>FAKEROOTBASEENV</glossterm> - <glossdef> - <para> - Lists environment variables to set when executing - the command defined by - <link linkend='var-FAKEROOTCMD'><filename>FAKEROOTCMD</filename></link> - that starts the bitbake-worker process - in the fakeroot environment. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FAKEROOTCMD'><glossterm>FAKEROOTCMD</glossterm> - <glossdef> - <para> - Contains the command that starts the bitbake-worker - process in the fakeroot environment. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FAKEROOTDIRS'><glossterm>FAKEROOTDIRS</glossterm> - <glossdef> - <para> - Lists directories to create before running a task in - the fakeroot environment. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FAKEROOTENV'><glossterm>FAKEROOTENV</glossterm> - <glossdef> - <para> - Lists environment variables to set when running a task - in the fakeroot environment. - For additional information on environment variables and - the fakeroot environment, see the - <link linkend='var-FAKEROOTBASEENV'><filename>FAKEROOTBASEENV</filename></link> - variable. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FAKEROOTNOENV'><glossterm>FAKEROOTNOENV</glossterm> - <glossdef> - <para> - Lists environment variables to set when running a task - that is not in the fakeroot environment. - For additional information on environment variables and - the fakeroot environment, see the - <link linkend='var-FAKEROOTENV'><filename>FAKEROOTENV</filename></link> - variable. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FETCHCMD'><glossterm>FETCHCMD</glossterm> - <glossdef> - <para> - Defines the command the BitBake fetcher module - executes when running fetch operations. - You need to use an override suffix when you use the - variable (e.g. <filename>FETCHCMD_git</filename> - or <filename>FETCHCMD_svn</filename>). - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FILE'><glossterm>FILE</glossterm> - <glossdef> - <para> - Points at the current file. - BitBake sets this variable during the parsing process - to identify the file being parsed. - BitBake also sets this variable when a recipe is being - executed to identify the recipe file. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FILESDIR'><glossterm>FILESDIR</glossterm> - <glossdef> - <para> - Specifies directories BitBake uses when searching for - patches and files. - The "local" fetcher module uses these directories when - handling <filename>file://</filename> URLs if the file - was not found using - <link linkend='var-FILESPATH'><filename>FILESPATH</filename></link>. - <note> - The <filename>FILESDIR</filename> variable is - deprecated and you should use - <filename>FILESPATH</filename> in all new code. - </note> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-FILESPATH'><glossterm>FILESPATH</glossterm> - <glossdef> - <para> - Specifies directories BitBake uses when searching for - patches and files. - The "local" fetcher module uses these directories when - handling <filename>file://</filename> URLs. - The variable behaves like a shell <filename>PATH</filename> - environment variable. - The value is a colon-separated list of directories that - are searched left-to-right in order. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - - <glossdiv id='var-glossary-g'><title>G</title> - - <glossentry id='var-GITDIR'><glossterm>GITDIR</glossterm> - <glossdef> - <para> - The directory in which a local copy of a Git repository - is stored when it is cloned. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - - <glossdiv id='var-glossary-h'><title>H</title> - - <glossentry id='var-HGDIR'><glossterm>HGDIR</glossterm> - <glossdef> - <para> - The directory in which files checked out of a Mercurial - system are stored. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-HOMEPAGE'><glossterm>HOMEPAGE</glossterm> - <glossdef> - <para>Website where more information about the software the recipe is building - can be found.</para> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-i'><title>I</title> - - <glossentry id='var-INHERIT'><glossterm>INHERIT</glossterm> - <glossdef> - <para> - Causes the named class to be inherited at - this point during parsing. - The variable is only valid in configuration files. - </para> - </glossdef> - </glossentry> - - </glossdiv> - -<!-- - <glossdiv id='var-glossary-j'><title>J</title> - </glossdiv> - - <glossdiv id='var-glossary-k'><title>K</title> - </glossdiv> ---> - - <glossdiv id='var-glossary-l'><title>L</title> - - <glossentry id='var-LAYERDEPENDS'><glossterm>LAYERDEPENDS</glossterm> - <glossdef> - <para>Lists the layers, separated by spaces, upon which this recipe depends. - Optionally, you can specify a specific layer version for a dependency - by adding it to the end of the layer name with a colon, (e.g. "anotherlayer:3" - to be compared against - <link linkend='var-LAYERVERSION'><filename>LAYERVERSION</filename></link><filename>_anotherlayer</filename> - in this case). - BitBake produces an error if any dependency is missing or - the version numbers do not match exactly (if specified).</para> - <para> - You use this variable in the <filename>conf/layer.conf</filename> file. - You must also use the specific layer name as a suffix - to the variable (e.g. <filename>LAYERDEPENDS_mylayer</filename>).</para> - </glossdef> - </glossentry> - - <glossentry id='var-LAYERDIR'><glossterm>LAYERDIR</glossterm> - <glossdef> - <para>When used inside the <filename>layer.conf</filename> configuration - file, this variable provides the path of the current layer. - This variable is not available outside of <filename>layer.conf</filename> - and references are expanded immediately when parsing of the file completes.</para> - </glossdef> - </glossentry> - - <glossentry id='var-LAYERVERSION'><glossterm>LAYERVERSION</glossterm> - <glossdef> - <para>Optionally specifies the version of a layer as a single number. - You can use this variable within - <link linkend='var-LAYERDEPENDS'><filename>LAYERDEPENDS</filename></link> - for another layer in order to depend on a specific version - of the layer.</para> - <para> - You use this variable in the <filename>conf/layer.conf</filename> file. - You must also use the specific layer name as a suffix - to the variable (e.g. <filename>LAYERDEPENDS_mylayer</filename>).</para> - </glossdef> - </glossentry> - - <glossentry id='var-LICENSE'><glossterm>LICENSE</glossterm> - <glossdef> - <para> - The list of source licenses for the recipe. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-m'><title>M</title> - - <glossentry id='var-MIRRORS'><glossterm>MIRRORS</glossterm> - <glossdef> - <para> - Specifies additional paths from which BitBake gets source code. - When the build system searches for source code, it first - tries the local download directory. - If that location fails, the build system tries locations - defined by - <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link>, - the upstream source, and then locations specified by - <filename>MIRRORS</filename> in that order. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-MULTI_PROVIDER_WHITELIST'><glossterm>MULTI_PROVIDER_WHITELIST</glossterm> - <glossdef> - <para> - Allows you to suppress BitBake warnings caused when - building two separate recipes that provide the same - output. - </para> - - <para> - Bitbake normally issues a warning when building two - different recipes where each provides the same output. - This scenario is usually something the user does not - want. - However, cases do exist where it makes sense, particularly - in the <filename>virtual/*</filename> namespace. - You can use this variable to suppress BitBake's warnings. - </para> - - <para> - To use the variable, list provider names (e.g. - recipe names, <filename>virtual/kernel</filename>, - and so forth). - </para> - </glossdef> - </glossentry> - - </glossdiv> - -<!-- - <glossdiv id='var-glossary-n'><title>N</title> - </glossdiv> ---> - - <glossdiv id='var-glossary-o'><title>O</title> - - <glossentry id='var-OVERRIDES'><glossterm>OVERRIDES</glossterm> - <glossdef> - <para> - BitBake uses <filename>OVERRIDES</filename> to control - what variables are overridden after BitBake parses - recipes and configuration files. - </para> - - <para> - Following is a simple example that uses an overrides - list based on machine architectures: - <literallayout class='monospaced'> - OVERRIDES = "arm:x86:mips:powerpc" - </literallayout> - You can find information on how to use - <filename>OVERRIDES</filename> in the - "<link linkend='conditional-syntax-overrides'>Conditional Syntax (Overrides)</link>" - section. - </para> - </glossdef> - </glossentry> - </glossdiv> - - <glossdiv id='var-glossary-p'><title>P</title> - - <glossentry id='var-PACKAGES'><glossterm>PACKAGES</glossterm> - <glossdef> - <para>The list of packages the recipe creates. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PACKAGES_DYNAMIC'><glossterm>PACKAGES_DYNAMIC</glossterm> - <glossdef> - <para> - A promise that your recipe satisfies runtime dependencies - for optional modules that are found in other recipes. - <filename>PACKAGES_DYNAMIC</filename> - does not actually satisfy the dependencies, it only states that - they should be satisfied. - For example, if a hard, runtime dependency - (<link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>) - of another package is satisfied during the build - through the <filename>PACKAGES_DYNAMIC</filename> - variable, but a package with the module name is never actually - produced, then the other package will be broken. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PE'><glossterm>PE</glossterm> - <glossdef> - <para> - The epoch of the recipe. - By default, this variable is unset. - The variable is used to make upgrades possible when the - versioning scheme changes in some backwards incompatible - way. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PERSISTENT_DIR'><glossterm>PERSISTENT_DIR</glossterm> - <glossdef> - <para> - Specifies the directory BitBake uses to store data that - should be preserved between builds. - In particular, the data stored is the data that uses - BitBake's persistent data API and the data used by the - PR Server and PR Service. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PF'><glossterm>PF</glossterm> - <glossdef> - <para> - Specifies the recipe or package name and includes all version and revision - numbers (i.e. <filename>eglibc-2.13-r20+svnr15508/</filename> and - <filename>bash-4.2-r1/</filename>). - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PN'><glossterm>PN</glossterm> - <glossdef> - <para>The recipe name.</para> - </glossdef> - </glossentry> - - <glossentry id='var-PR'><glossterm>PR</glossterm> - <glossdef> - <para>The revision of the recipe. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PREFERRED_PROVIDER'><glossterm>PREFERRED_PROVIDER</glossterm> - <glossdef> - <para> - Determines which recipe should be given preference when - multiple recipes provide the same item. - You should always suffix the variable with the name of the - provided item, and you should set it to the - <link linkend='var-PN'><filename>PN</filename></link> - of the recipe to which you want to give precedence. - Some examples: - <literallayout class='monospaced'> - PREFERRED_PROVIDER_virtual/kernel ?= "linux-yocto" - PREFERRED_PROVIDER_virtual/xserver = "xserver-xf86" - PREFERRED_PROVIDER_virtual/libgl ?= "mesa" - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PREFERRED_PROVIDERS'><glossterm>PREFERRED_PROVIDERS</glossterm> - <glossdef> - <para> - Determines which recipe should be given preference for - cases where multiple recipes provide the same item. - Functionally, - <filename>PREFERRED_PROVIDERS</filename> is identical to - <link linkend='var-PREFERRED_PROVIDER'><filename>PREFERRED_PROVIDER</filename></link>. - However, the <filename>PREFERRED_PROVIDERS</filename> - variable lets you define preferences for multiple - situations using the following form: - <literallayout class='monospaced'> - PREFERRED_PROVIDERS = "xxx:yyy aaa:bbb ..." - </literallayout> - This form is a convenient replacement for the following: - <literallayout class='monospaced'> - PREFERRED_PROVIDER_xxx = "yyy" - PREFERRED_PROVIDER_aaa = "bbb" - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PREFERRED_VERSION'><glossterm>PREFERRED_VERSION</glossterm> - <glossdef> - <para> - If there are multiple versions of recipes available, this - variable determines which recipe should be given preference. - You must always suffix the variable with the - <link linkend='var-PN'><filename>PN</filename></link> - you want to select, and you should set - <link linkend='var-PV'><filename>PV</filename></link> - accordingly for precedence. - You can use the "<filename>%</filename>" character as a - wildcard to match any number of characters, which can be - useful when specifying versions that contain long revision - numbers that could potentially change. - Here are two examples: - <literallayout class='monospaced'> - PREFERRED_VERSION_python = "2.7.3" - PREFERRED_VERSION_linux-yocto = "3.10%" - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PREMIRRORS'><glossterm>PREMIRRORS</glossterm> - <glossdef> - <para> - Specifies additional paths from which BitBake gets source code. - When the build system searches for source code, it first - tries the local download directory. - If that location fails, the build system tries locations - defined by <filename>PREMIRRORS</filename>, the upstream - source, and then locations specified by - <link linkend='var-MIRRORS'><filename>MIRRORS</filename></link> - in that order. - </para> - - <para> - Typically, you would add a specific server for the - build system to attempt before any others by adding - something like the following to your configuration: - <literallayout class='monospaced'> - PREMIRRORS_prepend = "\ - git://.*/.* http://www.yoctoproject.org/sources/ \n \ - ftp://.*/.* http://www.yoctoproject.org/sources/ \n \ - http://.*/.* http://www.yoctoproject.org/sources/ \n \ - https://.*/.* http://www.yoctoproject.org/sources/ \n" - </literallayout> - These changes cause the build system to intercept - Git, FTP, HTTP, and HTTPS requests and direct them to - the <filename>http://</filename> sources mirror. - You can use <filename>file://</filename> URLs to point - to local directories or network shares as well. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PROVIDES'><glossterm>PROVIDES</glossterm> - <glossdef> - <para> - A list of aliases by which a particular recipe can be - known. - By default, a recipe's own - <filename><link linkend='var-PN'>PN</link></filename> - is implicitly already in its <filename>PROVIDES</filename> - list. - If a recipe uses <filename>PROVIDES</filename>, the - additional aliases are synonyms for the recipe and can - be useful satisfying dependencies of other recipes during - the build as specified by - <filename><link linkend='var-DEPENDS'>DEPENDS</link></filename>. - </para> - - <para> - Consider the following example - <filename>PROVIDES</filename> statement from a recipe - file <filename>libav_0.8.11.bb</filename>: - <literallayout class='monospaced'> - PROVIDES += "libpostproc" - </literallayout> - The <filename>PROVIDES</filename> statement results in - the "libav" recipe also being known as "libpostproc". - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PRSERV_HOST'><glossterm>PRSERV_HOST</glossterm> - <glossdef> - <para> - The network based - <link linkend='var-PR'><filename>PR</filename></link> - service host and port. - </para> - - <para> - Following is an example of how the <filename>PRSERV_HOST</filename> variable is - set: - <literallayout class='monospaced'> - PRSERV_HOST = "localhost:0" - </literallayout> - You must set the variable if you want to automatically - start a local PR service. - You can set <filename>PRSERV_HOST</filename> to other - values to use a remote PR service. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-PV'><glossterm>PV</glossterm> - <glossdef> - <para>The version of the recipe. - </para> - </glossdef> - </glossentry> - - </glossdiv> - -<!-- - <glossdiv id='var-glossary-q'><title>Q</title> - </glossdiv> ---> - - <glossdiv id='var-glossary-r'><title>R</title> - - <glossentry id='var-RDEPENDS'><glossterm>RDEPENDS</glossterm> - <glossdef> - <para> - Lists a package's runtime dependencies (i.e. other packages) - that must be installed in order for the built package to run - correctly. - If a package in this list cannot be found during the build, - you will get a build error. - </para> - - <para> - Because the <filename>RDEPENDS</filename> variable applies - to packages being built, you should always use the variable - in a form with an attached package name. - For example, suppose you are building a development package - that depends on the <filename>perl</filename> package. - In this case, you would use the following - <filename>RDEPENDS</filename> statement: - <literallayout class='monospaced'> - RDEPENDS_${PN}-dev += "perl" - </literallayout> - In the example, the development package depends on - the <filename>perl</filename> package. - Thus, the <filename>RDEPENDS</filename> variable has the - <filename>${PN}-dev</filename> package name as part of the - variable. - </para> - - <para> - BitBake supports specifying versioned dependencies. - Although the syntax varies depending on the packaging - format, BitBake hides these differences from you. - Here is the general syntax to specify versions with - the <filename>RDEPENDS</filename> variable: - <literallayout class='monospaced'> - RDEPENDS_${PN} = "<replaceable>package</replaceable> (<replaceable>operator</replaceable> <replaceable>version</replaceable>)" - </literallayout> - For <filename>operator</filename>, you can specify the - following: - <literallayout class='monospaced'> - = - < - > - <= - >= - </literallayout> - For example, the following sets up a dependency on version - 1.2 or greater of the package <filename>foo</filename>: - <literallayout class='monospaced'> - RDEPENDS_${PN} = "foo (>= 1.2)" - </literallayout> - </para> - - <para> - For information on build-time dependencies, see the - <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link> - variable. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-RPROVIDES'><glossterm>RPROVIDES</glossterm> - <glossdef> - <para> - A list of package name aliases that a package also provides. - These aliases are useful for satisfying runtime dependencies - of other packages both during the build and on the target - (as specified by - <filename><link linkend='var-RDEPENDS'>RDEPENDS</link></filename>). - </para> - <para> - As with all package-controlling variables, you must always - use the variable in conjunction with a package name override. - Here is an example: - <literallayout class='monospaced'> - RPROVIDES_${PN} = "widget-abi-2" - </literallayout> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-RRECOMMENDS'><glossterm>RRECOMMENDS</glossterm> - <glossdef> - <para> - A list of packages that extends the usability of a package - being built. - The package being built does not depend on this list of - packages in order to successfully build, but needs them for - the extended usability. - To specify runtime dependencies for packages, see the - <filename><link linkend='var-RDEPENDS'>RDEPENDS</link></filename> - variable. - </para> - - <para> - BitBake supports specifying versioned recommends. - Although the syntax varies depending on the packaging - format, BitBake hides these differences from you. - Here is the general syntax to specify versions with - the <filename>RRECOMMENDS</filename> variable: - <literallayout class='monospaced'> - RRECOMMENDS_${PN} = "<replaceable>package</replaceable> (<replaceable>operator</replaceable> <replaceable>version</replaceable>)" - </literallayout> - For <filename>operator</filename>, you can specify the - following: - <literallayout class='monospaced'> - = - < - > - <= - >= - </literallayout> - For example, the following sets up a recommend on version - 1.2 or greater of the package <filename>foo</filename>: - <literallayout class='monospaced'> - RRECOMMENDS_${PN} = "foo (>= 1.2)" - </literallayout> - </para> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-s'><title>S</title> - - <glossentry id='var-SECTION'><glossterm>SECTION</glossterm> - <glossdef> - <para>The section in which packages should be categorized.</para> - </glossdef> - </glossentry> - - <glossentry id='var-SRC_URI'><glossterm>SRC_URI</glossterm> - <glossdef> - <para> - The list of source files - local or remote. - This variable tells BitBake which bits - to pull for the build and how to pull them. - For example, if the recipe or append file needs to - fetch a single tarball from the Internet, the recipe or - append file uses a <filename>SRC_URI</filename> - entry that specifies that tarball. - On the other hand, if the recipe or append file needs to - fetch a tarball and include a custom file, the recipe or - append file needs an <filename>SRC_URI</filename> variable - that specifies all those sources.</para> - <para>The following list explains the available URI protocols: - <itemizedlist> - <listitem><para><emphasis><filename>file://</filename> -</emphasis> - Fetches files, which are usually files shipped with - the metadata, - from the local machine. - The path is relative to the - <link linkend='var-FILESPATH'><filename>FILESPATH</filename></link> - variable.</para></listitem> - <listitem><para><emphasis><filename>bzr://</filename> -</emphasis> Fetches files from a - Bazaar revision control repository.</para></listitem> - <listitem><para><emphasis><filename>git://</filename> -</emphasis> Fetches files from a - Git revision control repository.</para></listitem> - <listitem><para><emphasis><filename>osc://</filename> -</emphasis> Fetches files from - an OSC (OpenSUSE Build service) revision control repository.</para></listitem> - <listitem><para><emphasis><filename>repo://</filename> -</emphasis> Fetches files from - a repo (Git) repository.</para></listitem> - <listitem><para><emphasis><filename>http://</filename> -</emphasis> Fetches files from - the Internet using HTTP.</para></listitem> - <listitem><para><emphasis><filename>https://</filename> -</emphasis> Fetches files - from the Internet using HTTPS.</para></listitem> - <listitem><para><emphasis><filename>ftp://</filename> -</emphasis> Fetches files - from the Internet using FTP.</para></listitem> - <listitem><para><emphasis><filename>cvs://</filename> -</emphasis> Fetches files from - a CVS revision control repository.</para></listitem> - <listitem><para><emphasis><filename>hg://</filename> -</emphasis> Fetches files from - a Mercurial (<filename>hg</filename>) revision control repository.</para></listitem> - <listitem><para><emphasis><filename>p4://</filename> -</emphasis> Fetches files from - a Perforce (<filename>p4</filename>) revision control repository.</para></listitem> - <listitem><para><emphasis><filename>ssh://</filename> -</emphasis> Fetches files from - a secure shell.</para></listitem> - <listitem><para><emphasis><filename>svn://</filename> -</emphasis> Fetches files from - a Subversion (<filename>svn</filename>) revision control repository.</para></listitem> - </itemizedlist> - </para> - <para>Here are some additional options worth mentioning: - <itemizedlist> - <listitem><para><emphasis><filename>unpack</filename> -</emphasis> Controls - whether or not to unpack the file if it is an archive. - The default action is to unpack the file.</para></listitem> - <listitem><para><emphasis><filename>subdir</filename> -</emphasis> Places the file - (or extracts its contents) into the specified - subdirectory. - This option is useful for unusual tarballs or other archives that - do not have their files already in a subdirectory within the archive. - </para></listitem> - <listitem><para><emphasis><filename>name</filename> -</emphasis> Specifies a - name to be used for association with <filename>SRC_URI</filename> checksums - when you have more than one file specified in <filename>SRC_URI</filename>. - </para></listitem> - <listitem><para><emphasis><filename>downloadfilename</filename> -</emphasis> Specifies - the filename used when storing the downloaded file.</para></listitem> - </itemizedlist> - </para> - </glossdef> - </glossentry> - - <glossentry id='var-SRCDATE'><glossterm>SRCDATE</glossterm> - <glossdef> - <para> - The date of the source code used to build the package. - This variable applies only if the source was fetched from a Source Code Manager (SCM). - </para> - </glossdef> - </glossentry> - - <glossentry id='var-SRCREV'><glossterm>SRCREV</glossterm> - <glossdef> - <para> - The revision of the source code used to build the package. - This variable applies only when using Subversion, Git, Mercurial and Bazaar. - If you want to build a fixed revision and you want - to avoid performing a query on the remote repository every time - BitBake parses your recipe, you should specify a <filename>SRCREV</filename> that is a - full revision identifier and not just a tag. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-SRCREV_FORMAT'><glossterm>SRCREV_FORMAT</glossterm> - <glossdef> - <para> - Helps construct valid - <link linkend='var-SRCREV'><filename>SRCREV</filename></link> - values when multiple source controlled URLs are used in - <link linkend='var-SRC_URI'><filename>SRC_URI</filename></link>. - </para> - - <para> - The system needs help constructing these values under these - circumstances. - Each component in the <filename>SRC_URI</filename> - is assigned a name and these are referenced - in the <filename>SRCREV_FORMAT</filename> variable. - Consider an example with URLs named "machine" and "meta". - In this case, <filename>SRCREV_FORMAT</filename> could look - like "machine_meta" and those names would have the SCM - versions substituted into each position. - Only one <filename>AUTOINC</filename> placeholder is added - and if needed. - And, this placeholder is placed at the start of the - returned string. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-STAMP'><glossterm>STAMP</glossterm> - <glossdef> - <para> - Specifies the base path used to create recipe stamp files. - The path to an actual stamp file is constructed by evaluating this - string and then appending additional information. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-STAMPCLEAN'><glossterm>STAMPCLEAN</glossterm> - <glossdef> - <para> - Specifies the base path used to create recipe stamp files. - Unlike the - <link linkend='var-STAMP'><filename>STAMP</filename></link> - variable, <filename>STAMPCLEAN</filename> can contain - wildcards to match the range of files a clean operation - should remove. - BitBake uses a clean operation to remove any other stamps - it should be removing when creating a new stamp. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-SUMMARY'><glossterm>SUMMARY</glossterm> - <glossdef> - <para> - A short summary for the recipe, which is 72 characters or less. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-SVNDIR'><glossterm>SVNDIR</glossterm> - <glossdef> - <para> - The directory in which files checked out of a Subversion - system are stored. - </para> - </glossdef> - </glossentry> - - </glossdiv> - - <glossdiv id='var-glossary-t'><title>T</title> - - <glossentry id='var-T'><glossterm>T</glossterm> - <glossdef> - <para>Points to a directory were BitBake places - temporary files, which consist mostly of task logs and - scripts, when building a particular recipe. - </para> - </glossdef> - </glossentry> - - <glossentry id='var-TOPDIR'><glossterm>TOPDIR</glossterm> - <glossdef> - <para> - Points to the build directory. - BitBake automatically sets this variable. - </para> - </glossdef> - </glossentry> - - </glossdiv> - -<!-- - <glossdiv id='var-glossary-u'><title>U</title> - </glossdiv> - - <glossdiv id='var-glossary-v'><title>V</title> - </glossdiv> - - <glossdiv id='var-glossary-w'><title>W</title> - </glossdiv> - - <glossdiv id='var-glossary-x'><title>X</title> - </glossdiv> - - <glossdiv id='var-glossary-y'><title>Y</title> - </glossdiv> - - <glossdiv id='var-glossary-z'><title>Z</title> - </glossdiv> ---> - - -</glossary> -</chapter> -<!-- -vim: expandtab tw=80 ts=4 ---> diff --git a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-style.css b/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-style.css deleted file mode 100644 index 65da2a4e3..000000000 --- a/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-style.css +++ /dev/null @@ -1,984 +0,0 @@ -/* - Generic XHTML / DocBook XHTML CSS Stylesheet. - - Browser wrangling and typographic design by - Oyvind Kolas / pippin@gimp.org - - Customised for Poky by - Matthew Allum / mallum@o-hand.com - - Thanks to: - Liam R. 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