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-rw-r--r--bitbake/lib/bb/parse/parse_py/ConfHandler.py189
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diff --git a/bitbake/lib/bb/parse/parse_py/ConfHandler.py b/bitbake/lib/bb/parse/parse_py/ConfHandler.py
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1#!/usr/bin/env python
2# ex:ts=4:sw=4:sts=4:et
3# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
4"""
5 class for handling configuration data files
6
7 Reads a .conf file and obtains its metadata
8
9"""
10
11# Copyright (C) 2003, 2004 Chris Larson
12# Copyright (C) 2003, 2004 Phil Blundell
13#
14# This program is free software; you can redistribute it and/or modify
15# it under the terms of the GNU General Public License version 2 as
16# published by the Free Software Foundation.
17#
18# This program is distributed in the hope that it will be useful,
19# but WITHOUT ANY WARRANTY; without even the implied warranty of
20# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21# GNU General Public License for more details.
22#
23# You should have received a copy of the GNU General Public License along
24# with this program; if not, write to the Free Software Foundation, Inc.,
25# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26
27import re, os
28import logging
29import bb.utils
30from bb.parse import ParseError, resolve_file, ast, logger
31
32__config_regexp__ = re.compile( r"""
33 ^
34 (?P<exp>export\s*)?
35 (?P<var>[a-zA-Z0-9\-~_+.${}/]+?)
36 (\[(?P<flag>[a-zA-Z0-9\-_+.]+)\])?
37
38 \s* (
39 (?P<colon>:=) |
40 (?P<lazyques>\?\?=) |
41 (?P<ques>\?=) |
42 (?P<append>\+=) |
43 (?P<prepend>=\+) |
44 (?P<predot>=\.) |
45 (?P<postdot>\.=) |
46 =
47 ) \s*
48
49 (?!'[^']*'[^']*'$)
50 (?!\"[^\"]*\"[^\"]*\"$)
51 (?P<apo>['\"])
52 (?P<value>.*)
53 (?P=apo)
54 $
55 """, re.X)
56__include_regexp__ = re.compile( r"include\s+(.+)" )
57__require_regexp__ = re.compile( r"require\s+(.+)" )
58__export_regexp__ = re.compile( r"export\s+([a-zA-Z0-9\-_+.${}/]+)$" )
59
60def init(data):
61 topdir = data.getVar('TOPDIR')
62 if not topdir:
63 data.setVar('TOPDIR', os.getcwd())
64
65
66def supports(fn, d):
67 return fn[-5:] == ".conf"
68
69def include(oldfn, fn, lineno, data, error_out):
70 """
71 error_out: A string indicating the verb (e.g. "include", "inherit") to be
72 used in a ParseError that will be raised if the file to be included could
73 not be included. Specify False to avoid raising an error in this case.
74 """
75 if oldfn == fn: # prevent infinite recursion
76 return None
77
78 import bb
79 fn = data.expand(fn)
80 oldfn = data.expand(oldfn)
81
82 if not os.path.isabs(fn):
83 dname = os.path.dirname(oldfn)
84 bbpath = "%s:%s" % (dname, data.getVar("BBPATH", True))
85 abs_fn, attempts = bb.utils.which(bbpath, fn, history=True)
86 if abs_fn and bb.parse.check_dependency(data, abs_fn):
87 bb.warn("Duplicate inclusion for %s in %s" % (abs_fn, data.getVar('FILE', True)))
88 for af in attempts:
89 bb.parse.mark_dependency(data, af)
90 if abs_fn:
91 fn = abs_fn
92 elif bb.parse.check_dependency(data, fn):
93 bb.warn("Duplicate inclusion for %s in %s" % (fn, data.getVar('FILE', True)))
94
95 from bb.parse import handle
96 try:
97 ret = handle(fn, data, True)
98 except (IOError, OSError):
99 if error_out:
100 raise ParseError("Could not %(error_out)s file %(fn)s" % vars(), oldfn, lineno)
101 logger.debug(2, "CONF file '%s' not found", fn)
102 bb.parse.mark_dependency(data, fn)
103
104# We have an issue where a UI might want to enforce particular settings such as
105# an empty DISTRO variable. If configuration files do something like assigning
106# a weak default, it turns out to be very difficult to filter out these changes,
107# particularly when the weak default might appear half way though parsing a chain
108# of configuration files. We therefore let the UIs hook into configuration file
109# parsing. This turns out to be a hard problem to solve any other way.
110confFilters = []
111
112def handle(fn, data, include):
113 init(data)
114
115 if include == 0:
116 oldfile = None
117 else:
118 oldfile = data.getVar('FILE')
119
120 abs_fn = resolve_file(fn, data)
121 f = open(abs_fn, 'r')
122
123 if include:
124 bb.parse.mark_dependency(data, abs_fn)
125
126 statements = ast.StatementGroup()
127 lineno = 0
128 while True:
129 lineno = lineno + 1
130 s = f.readline()
131 if not s:
132 break
133 w = s.strip()
134 # skip empty lines
135 if not w:
136 continue
137 s = s.rstrip()
138 while s[-1] == '\\':
139 s2 = f.readline().strip()
140 lineno = lineno + 1
141 if (not s2 or s2 and s2[0] != "#") and s[0] == "#" :
142 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))
143 s = s[:-1] + s2
144 # skip comments
145 if s[0] == '#':
146 continue
147 feeder(lineno, s, abs_fn, statements)
148
149 # DONE WITH PARSING... time to evaluate
150 data.setVar('FILE', abs_fn)
151 statements.eval(data)
152 if oldfile:
153 data.setVar('FILE', oldfile)
154
155 f.close()
156
157 for f in confFilters:
158 f(fn, data)
159
160 return data
161
162def feeder(lineno, s, fn, statements):
163 m = __config_regexp__.match(s)
164 if m:
165 groupd = m.groupdict()
166 ast.handleData(statements, fn, lineno, groupd)
167 return
168
169 m = __include_regexp__.match(s)
170 if m:
171 ast.handleInclude(statements, fn, lineno, m, False)
172 return
173
174 m = __require_regexp__.match(s)
175 if m:
176 ast.handleInclude(statements, fn, lineno, m, True)
177 return
178
179 m = __export_regexp__.match(s)
180 if m:
181 ast.handleExport(statements, fn, lineno, m)
182 return
183
184 raise ParseError("unparsed line: '%s'" % s, fn, lineno);
185
186# Add us to the handlers list
187from bb.parse import handlers
188handlers.append({'supports': supports, 'handle': handle, 'init': init})
189del handlers