diff options
Diffstat (limited to 'import-layers/yocto-poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py')
| -rw-r--r-- | import-layers/yocto-poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/import-layers/yocto-poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py b/import-layers/yocto-poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py new file mode 100644 index 000000000..fbd75b14a --- /dev/null +++ b/import-layers/yocto-poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py @@ -0,0 +1,193 @@ +#!/usr/bin/env python +# ex:ts=4:sw=4:sts=4:et +# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- +""" + class for handling configuration data files + + Reads a .conf file and obtains its metadata + +""" + +# Copyright (C) 2003, 2004 Chris Larson +# Copyright (C) 2003, 2004 Phil Blundell +# +# 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. + +import errno +import re +import os +import bb.utils +from bb.parse import ParseError, resolve_file, ast, logger, handle + +__config_regexp__ = re.compile( r""" + ^ + (?P<exp>export\s*)? + (?P<var>[a-zA-Z0-9\-~_+.${}/]+?) + (\[(?P<flag>[a-zA-Z0-9\-_+.]+)\])? + + \s* ( + (?P<colon>:=) | + (?P<lazyques>\?\?=) | + (?P<ques>\?=) | + (?P<append>\+=) | + (?P<prepend>=\+) | + (?P<predot>=\.) | + (?P<postdot>\.=) | + = + ) \s* + + (?!'[^']*'[^']*'$) + (?!\"[^\"]*\"[^\"]*\"$) + (?P<apo>['\"]) + (?P<value>.*) + (?P=apo) + $ + """, re.X) +__include_regexp__ = re.compile( r"include\s+(.+)" ) +__require_regexp__ = re.compile( r"require\s+(.+)" ) +__export_regexp__ = re.compile( r"export\s+([a-zA-Z0-9\-_+.${}/]+)$" ) + +def init(data): + topdir = data.getVar('TOPDIR', False) + if not topdir: + data.setVar('TOPDIR', os.getcwd()) + + +def supports(fn, d): + return fn[-5:] == ".conf" + +def include(parentfn, fn, lineno, data, error_out): + """ + error_out: A string indicating the verb (e.g. "include", "inherit") to be + used in a ParseError that will be raised if the file to be included could + not be included. Specify False to avoid raising an error in this case. + """ + if parentfn == fn: # prevent infinite recursion + return None + + fn = data.expand(fn) + parentfn = data.expand(parentfn) + + if not os.path.isabs(fn): + dname = os.path.dirname(parentfn) + bbpath = "%s:%s" % (dname, data.getVar("BBPATH", True)) + abs_fn, attempts = bb.utils.which(bbpath, fn, history=True) + if abs_fn and bb.parse.check_dependency(data, abs_fn): + logger.warn("Duplicate inclusion for %s in %s" % (abs_fn, data.getVar('FILE', True))) + for af in attempts: + bb.parse.mark_dependency(data, af) + if abs_fn: + fn = abs_fn + elif bb.parse.check_dependency(data, fn): + logger.warn("Duplicate inclusion for %s in %s" % (fn, data.getVar('FILE', True))) + + try: + bb.parse.handle(fn, data, True) + except (IOError, OSError) as exc: + if exc.errno == errno.ENOENT: + if error_out: + raise ParseError("Could not %s file %s" % (error_out, fn), parentfn, lineno) + logger.debug(2, "CONF file '%s' not found", fn) + else: + if error_out: + raise ParseError("Could not %s file %s: %s" % (error_out, fn, exc.strerror), parentfn, lineno) + else: + raise ParseError("Error parsing %s: %s" % (fn, exc.strerror), parentfn, lineno) + +# We have an issue where a UI might want to enforce particular settings such as +# an empty DISTRO variable. If configuration files do something like assigning +# a weak default, it turns out to be very difficult to filter out these changes, +# particularly when the weak default might appear half way though parsing a chain +# of configuration files. We therefore let the UIs hook into configuration file +# parsing. This turns out to be a hard problem to solve any other way. +confFilters = [] + +def handle(fn, data, include): + init(data) + + if include == 0: + oldfile = None + else: + oldfile = data.getVar('FILE', False) + + abs_fn = resolve_file(fn, data) + f = open(abs_fn, 'r') + + if include: + bb.parse.mark_dependency(data, abs_fn) + + statements = ast.StatementGroup() + lineno = 0 + while True: + lineno = lineno + 1 + s = f.readline() + if not s: + break + w = s.strip() + # skip empty lines + if not w: + continue + s = s.rstrip() + while s[-1] == '\\': + s2 = f.readline().strip() + lineno = lineno + 1 + if (not s2 or s2 and s2[0] != "#") and s[0] == "#" : + bb.fatal("There is a confusing multiline, partially commented expression on line %s of file %s (%s).\nPlease clarify whether this is all a comment or should be parsed." % (lineno, fn, s)) + s = s[:-1] + s2 + # skip comments + if s[0] == '#': + continue + feeder(lineno, s, abs_fn, statements) + + # DONE WITH PARSING... time to evaluate + data.setVar('FILE', abs_fn) + statements.eval(data) + if oldfile: + data.setVar('FILE', oldfile) + + f.close() + + for f in confFilters: + f(fn, data) + + return data + +def feeder(lineno, s, fn, statements): + m = __config_regexp__.match(s) + if m: + groupd = m.groupdict() + ast.handleData(statements, fn, lineno, groupd) + return + + m = __include_regexp__.match(s) + if m: + ast.handleInclude(statements, fn, lineno, m, False) + return + + m = __require_regexp__.match(s) + if m: + ast.handleInclude(statements, fn, lineno, m, True) + return + + m = __export_regexp__.match(s) + if m: + ast.handleExport(statements, fn, lineno, m) + return + + raise ParseError("unparsed line: '%s'" % s, fn, lineno); + +# Add us to the handlers list +from bb.parse import handlers +handlers.append({'supports': supports, 'handle': handle, 'init': init}) +del handlers |
