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Diffstat (limited to 'poky/scripts/lib/wic/partition.py')
| -rw-r--r-- | poky/scripts/lib/wic/partition.py | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/poky/scripts/lib/wic/partition.py b/poky/scripts/lib/wic/partition.py new file mode 100644 index 000000000..3fe5c4e26 --- /dev/null +++ b/poky/scripts/lib/wic/partition.py @@ -0,0 +1,425 @@ +# ex:ts=4:sw=4:sts=4:et +# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- +# +# Copyright (c) 2013-2016 Intel Corporation. +# All rights reserved. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program; if not, write to the Free Software Foundation, Inc., +# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +# +# DESCRIPTION +# This module provides the OpenEmbedded partition object definitions. +# +# AUTHORS +# Tom Zanussi <tom.zanussi (at] linux.intel.com> +# Ed Bartosh <ed.bartosh> (at] linux.intel.com> + +import logging +import os +import uuid + +from wic import WicError +from wic.misc import exec_cmd, exec_native_cmd, get_bitbake_var +from wic.pluginbase import PluginMgr + +logger = logging.getLogger('wic') + +class Partition(): + + def __init__(self, args, lineno): + self.args = args + self.active = args.active + self.align = args.align + self.disk = args.disk + self.device = None + self.extra_space = args.extra_space + self.exclude_path = args.exclude_path + self.fsopts = args.fsopts + self.fstype = args.fstype + self.label = args.label + self.mkfs_extraopts = args.mkfs_extraopts + self.mountpoint = args.mountpoint + self.no_table = args.no_table + self.num = None + self.overhead_factor = args.overhead_factor + self.part_name = args.part_name + self.part_type = args.part_type + self.rootfs_dir = args.rootfs_dir + self.size = args.size + self.fixed_size = args.fixed_size + self.source = args.source + self.sourceparams = args.sourceparams + self.system_id = args.system_id + self.use_uuid = args.use_uuid + self.uuid = args.uuid + self.fsuuid = args.fsuuid + + self.lineno = lineno + self.source_file = "" + self.sourceparams_dict = {} + + def get_extra_block_count(self, current_blocks): + """ + The --size param is reflected in self.size (in kB), and we already + have current_blocks (1k) blocks, calculate and return the + number of (1k) blocks we need to add to get to --size, 0 if + we're already there or beyond. + """ + logger.debug("Requested partition size for %s: %d", + self.mountpoint, self.size) + + if not self.size: + return 0 + + requested_blocks = self.size + + logger.debug("Requested blocks %d, current_blocks %d", + requested_blocks, current_blocks) + + if requested_blocks > current_blocks: + return requested_blocks - current_blocks + else: + return 0 + + def get_rootfs_size(self, actual_rootfs_size=0): + """ + Calculate the required size of rootfs taking into consideration + --size/--fixed-size flags as well as overhead and extra space, as + specified in kickstart file. Raises an error if the + `actual_rootfs_size` is larger than fixed-size rootfs. + + """ + if self.fixed_size: + rootfs_size = self.fixed_size + if actual_rootfs_size > rootfs_size: + raise WicError("Actual rootfs size (%d kB) is larger than " + "allowed size %d kB" % + (actual_rootfs_size, rootfs_size)) + else: + extra_blocks = self.get_extra_block_count(actual_rootfs_size) + if extra_blocks < self.extra_space: + extra_blocks = self.extra_space + + rootfs_size = actual_rootfs_size + extra_blocks + rootfs_size *= self.overhead_factor + + logger.debug("Added %d extra blocks to %s to get to %d total blocks", + extra_blocks, self.mountpoint, rootfs_size) + + return rootfs_size + + @property + def disk_size(self): + """ + Obtain on-disk size of partition taking into consideration + --size/--fixed-size options. + + """ + return self.fixed_size if self.fixed_size else self.size + + def prepare(self, creator, cr_workdir, oe_builddir, rootfs_dir, + bootimg_dir, kernel_dir, native_sysroot): + """ + Prepare content for individual partitions, depending on + partition command parameters. + """ + if not self.source: + if not self.size and not self.fixed_size: + raise WicError("The %s partition has a size of zero. Please " + "specify a non-zero --size/--fixed-size for that " + "partition." % self.mountpoint) + + if self.fstype == "swap": + self.prepare_swap_partition(cr_workdir, oe_builddir, + native_sysroot) + self.source_file = "%s/fs.%s" % (cr_workdir, self.fstype) + else: + if self.fstype == 'squashfs': + raise WicError("It's not possible to create empty squashfs " + "partition '%s'" % (self.mountpoint)) + + rootfs = "%s/fs_%s.%s.%s" % (cr_workdir, self.label, + self.lineno, self.fstype) + if os.path.isfile(rootfs): + os.remove(rootfs) + + prefix = "ext" if self.fstype.startswith("ext") else self.fstype + method = getattr(self, "prepare_empty_partition_" + prefix) + method(rootfs, oe_builddir, native_sysroot) + self.source_file = rootfs + return + + plugins = PluginMgr.get_plugins('source') + + if self.source not in plugins: + raise WicError("The '%s' --source specified for %s doesn't exist.\n\t" + "See 'wic list source-plugins' for a list of available" + " --sources.\n\tSee 'wic help source-plugins' for " + "details on adding a new source plugin." % + (self.source, self.mountpoint)) + + srcparams_dict = {} + if self.sourceparams: + # Split sourceparams string of the form key1=val1[,key2=val2,...] + # into a dict. Also accepts valueless keys i.e. without = + splitted = self.sourceparams.split(',') + srcparams_dict = dict(par.split('=') for par in splitted if par) + + plugin = PluginMgr.get_plugins('source')[self.source] + plugin.do_configure_partition(self, srcparams_dict, creator, + cr_workdir, oe_builddir, bootimg_dir, + kernel_dir, native_sysroot) + plugin.do_stage_partition(self, srcparams_dict, creator, + cr_workdir, oe_builddir, bootimg_dir, + kernel_dir, native_sysroot) + plugin.do_prepare_partition(self, srcparams_dict, creator, + cr_workdir, oe_builddir, bootimg_dir, + kernel_dir, rootfs_dir, native_sysroot) + plugin.do_post_partition(self, srcparams_dict, creator, + cr_workdir, oe_builddir, bootimg_dir, + kernel_dir, rootfs_dir, native_sysroot) + + # further processing required Partition.size to be an integer, make + # sure that it is one + if not isinstance(self.size, int): + raise WicError("Partition %s internal size is not an integer. " + "This a bug in source plugin %s and needs to be fixed." % + (self.mountpoint, self.source)) + + if self.fixed_size and self.size > self.fixed_size: + raise WicError("File system image of partition %s is " + "larger (%d kB) than its allowed size %d kB" % + (self.mountpoint, self.size, self.fixed_size)) + + def prepare_rootfs(self, cr_workdir, oe_builddir, rootfs_dir, + native_sysroot, real_rootfs = True): + """ + Prepare content for a rootfs partition i.e. create a partition + and fill it from a /rootfs dir. + + Currently handles ext2/3/4, btrfs, vfat and squashfs. + """ + p_prefix = os.environ.get("PSEUDO_PREFIX", "%s/usr" % native_sysroot) + p_localstatedir = os.environ.get("PSEUDO_LOCALSTATEDIR", + "%s/../pseudo" % get_bitbake_var("IMAGE_ROOTFS")) + p_passwd = os.environ.get("PSEUDO_PASSWD", rootfs_dir) + p_nosymlinkexp = os.environ.get("PSEUDO_NOSYMLINKEXP", "1") + pseudo = "export PSEUDO_PREFIX=%s;" % p_prefix + pseudo += "export PSEUDO_LOCALSTATEDIR=%s;" % p_localstatedir + pseudo += "export PSEUDO_PASSWD=%s;" % p_passwd + pseudo += "export PSEUDO_NOSYMLINKEXP=%s;" % p_nosymlinkexp + pseudo += "%s " % get_bitbake_var("FAKEROOTCMD") + + rootfs = "%s/rootfs_%s.%s.%s" % (cr_workdir, self.label, + self.lineno, self.fstype) + if os.path.isfile(rootfs): + os.remove(rootfs) + + # Get rootfs size from bitbake variable if it's not set in .ks file + if not self.size and real_rootfs: + # Bitbake variable ROOTFS_SIZE is calculated in + # Image._get_rootfs_size method from meta/lib/oe/image.py + # using IMAGE_ROOTFS_SIZE, IMAGE_ROOTFS_ALIGNMENT, + # IMAGE_OVERHEAD_FACTOR and IMAGE_ROOTFS_EXTRA_SPACE + rsize_bb = get_bitbake_var('ROOTFS_SIZE') + if rsize_bb: + logger.warning('overhead-factor was specified, but size was not,' + ' so bitbake variables will be used for the size.' + ' In this case both IMAGE_OVERHEAD_FACTOR and ' + '--overhead-factor will be applied') + self.size = int(round(float(rsize_bb))) + + prefix = "ext" if self.fstype.startswith("ext") else self.fstype + method = getattr(self, "prepare_rootfs_" + prefix) + method(rootfs, oe_builddir, rootfs_dir, native_sysroot, pseudo) + self.source_file = rootfs + + # get the rootfs size in the right units for kickstart (kB) + du_cmd = "du -Lbks %s" % rootfs + out = exec_cmd(du_cmd) + self.size = int(out.split()[0]) + + def prepare_rootfs_ext(self, rootfs, oe_builddir, rootfs_dir, + native_sysroot, pseudo): + """ + Prepare content for an ext2/3/4 rootfs partition. + """ + du_cmd = "du -ks %s" % rootfs_dir + out = exec_cmd(du_cmd) + actual_rootfs_size = int(out.split()[0]) + + rootfs_size = self.get_rootfs_size(actual_rootfs_size) + + with open(rootfs, 'w') as sparse: + os.ftruncate(sparse.fileno(), rootfs_size * 1024) + + extraopts = self.mkfs_extraopts or "-F -i 8192" + + label_str = "" + if self.label: + label_str = "-L %s" % self.label + + mkfs_cmd = "mkfs.%s %s %s %s -U %s -d %s" % \ + (self.fstype, extraopts, rootfs, label_str, self.fsuuid, rootfs_dir) + exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo) + + mkfs_cmd = "fsck.%s -pvfD %s" % (self.fstype, rootfs) + exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo) + + def prepare_rootfs_btrfs(self, rootfs, oe_builddir, rootfs_dir, + native_sysroot, pseudo): + """ + Prepare content for a btrfs rootfs partition. + """ + du_cmd = "du -ks %s" % rootfs_dir + out = exec_cmd(du_cmd) + actual_rootfs_size = int(out.split()[0]) + + rootfs_size = self.get_rootfs_size(actual_rootfs_size) + + with open(rootfs, 'w') as sparse: + os.ftruncate(sparse.fileno(), rootfs_size * 1024) + + label_str = "" + if self.label: + label_str = "-L %s" % self.label + + mkfs_cmd = "mkfs.%s -b %d -r %s %s %s -U %s %s" % \ + (self.fstype, rootfs_size * 1024, rootfs_dir, label_str, + self.mkfs_extraopts, self.fsuuid, rootfs) + exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo) + + def prepare_rootfs_msdos(self, rootfs, oe_builddir, rootfs_dir, + native_sysroot, pseudo): + """ + Prepare content for a msdos/vfat rootfs partition. + """ + du_cmd = "du -bks %s" % rootfs_dir + out = exec_cmd(du_cmd) + blocks = int(out.split()[0]) + + rootfs_size = self.get_rootfs_size(blocks) + + label_str = "-n boot" + if self.label: + label_str = "-n %s" % self.label + + size_str = "" + if self.fstype == 'msdos': + size_str = "-F 16" # FAT 16 + + extraopts = self.mkfs_extraopts or '-S 512' + + dosfs_cmd = "mkdosfs %s -i %s %s %s -C %s %d" % \ + (label_str, self.fsuuid, size_str, extraopts, rootfs, + max(8250, rootfs_size)) + exec_native_cmd(dosfs_cmd, native_sysroot) + + mcopy_cmd = "mcopy -i %s -s %s/* ::/" % (rootfs, rootfs_dir) + exec_native_cmd(mcopy_cmd, native_sysroot) + + chmod_cmd = "chmod 644 %s" % rootfs + exec_cmd(chmod_cmd) + + prepare_rootfs_vfat = prepare_rootfs_msdos + + def prepare_rootfs_squashfs(self, rootfs, oe_builddir, rootfs_dir, + native_sysroot, pseudo): + """ + Prepare content for a squashfs rootfs partition. + """ + extraopts = self.mkfs_extraopts or '-noappend' + squashfs_cmd = "mksquashfs %s %s %s" % \ + (rootfs_dir, rootfs, extraopts) + exec_native_cmd(squashfs_cmd, native_sysroot, pseudo=pseudo) + + def prepare_empty_partition_ext(self, rootfs, oe_builddir, + native_sysroot): + """ + Prepare an empty ext2/3/4 partition. + """ + size = self.disk_size + with open(rootfs, 'w') as sparse: + os.ftruncate(sparse.fileno(), size * 1024) + + extraopts = self.mkfs_extraopts or "-i 8192" + + label_str = "" + if self.label: + label_str = "-L %s" % self.label + + mkfs_cmd = "mkfs.%s -F %s %s -U %s %s" % \ + (self.fstype, extraopts, label_str, self.fsuuid, rootfs) + exec_native_cmd(mkfs_cmd, native_sysroot) + + def prepare_empty_partition_btrfs(self, rootfs, oe_builddir, + native_sysroot): + """ + Prepare an empty btrfs partition. + """ + size = self.disk_size + with open(rootfs, 'w') as sparse: + os.ftruncate(sparse.fileno(), size * 1024) + + label_str = "" + if self.label: + label_str = "-L %s" % self.label + + mkfs_cmd = "mkfs.%s -b %d %s -U %s %s %s" % \ + (self.fstype, self.size * 1024, label_str, self.fsuuid, + self.mkfs_extraopts, rootfs) + exec_native_cmd(mkfs_cmd, native_sysroot) + + def prepare_empty_partition_msdos(self, rootfs, oe_builddir, + native_sysroot): + """ + Prepare an empty vfat partition. + """ + blocks = self.disk_size + + label_str = "-n boot" + if self.label: + label_str = "-n %s" % self.label + + size_str = "" + if self.fstype == 'msdos': + size_str = "-F 16" # FAT 16 + + extraopts = self.mkfs_extraopts or '-S 512' + + dosfs_cmd = "mkdosfs %s -i %s %s %s -C %s %d" % \ + (label_str, self.fsuuid, extraopts, size_str, rootfs, + blocks) + + exec_native_cmd(dosfs_cmd, native_sysroot) + + chmod_cmd = "chmod 644 %s" % rootfs + exec_cmd(chmod_cmd) + + prepare_empty_partition_vfat = prepare_empty_partition_msdos + + def prepare_swap_partition(self, cr_workdir, oe_builddir, native_sysroot): + """ + Prepare a swap partition. + """ + path = "%s/fs.%s" % (cr_workdir, self.fstype) + + with open(path, 'w') as sparse: + os.ftruncate(sparse.fileno(), self.size * 1024) + + label_str = "" + if self.label: + label_str = "-L %s" % self.label + + mkswap_cmd = "mkswap %s -U %s %s" % (label_str, self.fsuuid, path) + exec_native_cmd(mkswap_cmd, native_sysroot) |
