Backporting ilevy@'s ParsePythonCfg so it can be used in Annotator.

scripts/common/chromium_utils.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """ Set of basic operations/utilities that are used by the build. """
 
 import copy
 import errno
 import fnmatch
 import glob
@@ skipping 973 matching lines @@
   path = os.path.join(os.path.dirname(__file__), '..', '..',
       'masters/*/' + cue)
   filenames = []
   if include_public:
     filenames += glob.glob(path)
   if include_internal:
     filenames += glob.glob(path_internal)
   return [os.path.abspath(os.path.dirname(f)) for f in filenames]
 
 
+def ParsePythonCfg(cfg_filepath):
+  """Retrieves data from a python config file."""
+  if not os.path.exists(cfg_filepath):
+    return None
+  base_path = os.path.dirname(os.path.abspath(cfg_filepath))
+  old_sys_path = sys.path
+  sys.path = sys.path + [base_path]
+  old_path = os.getcwd()
+  try:
+    os.chdir(base_path)
+    local_vars = {}
+    execfile(os.path.join(cfg_filepath), local_vars)
+    del local_vars['__builtins__']
+    return local_vars
+  finally:
+    os.chdir(old_path)
+    sys.path = old_sys_path
+
+
 def RunSlavesCfg(slaves_cfg):
   """Runs slaves.cfg in a consistent way."""
   if not os.path.exists(slaves_cfg):
     return []
   slaves_path = os.path.dirname(os.path.abspath(slaves_cfg))
   old_sys_path = sys.path
   sys.path = sys.path + [slaves_path]
   try:
     old_path = os.getcwd()
     try:
@@ skipping 156 matching lines @@
         'This is almost certainly incorrect.' % (build_dir, platform_key))
     if use_out:
       legacy_path = 'out'
     else:
       legacy_path = legacy_paths[platform_key]
     build_dir = os.path.join(os.path.dirname(build_dir), legacy_path)
     print >> sys.stderr, ('Assuming you meant "%s"' % build_dir)
     bad = True
 
   return (build_dir, bad)