When looking up a file in the first IDs list, and the file is outside of the tree starting at SRCDI…

grit/node/misc.py

 #!/usr/bin/env python
 # 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.
 
 """Miscellaneous node types.
 """
 
 import os.path
 import re
@@ skipping 440 matching lines @@
     # Nothing to do if the first_ids_filename attribute isn't set.
     first_ids_filename = self.GetFirstIdsFile()
     if not first_ids_filename:
       return
 
     src_root_dir, first_ids = _ReadFirstIdsFromFile(first_ids_filename,
                                                     defines)
     from grit.node import empty
     for node in self.inorder():
       if isinstance(node, empty.GroupingNode):
-        filename = os.path.abspath(filename_or_stream)[
-          len(src_root_dir) + 1:]
-        filename = filename.replace('\\', '/')
+        abs_filename = os.path.abspath(filename_or_stream)
+        if abs_filename[:len(src_root_dir)] != src_root_dir:
+          filename = os.path.basename(filename_or_stream)
+        else:
+          filename = abs_filename[len(src_root_dir) + 1:]
+          filename = filename.replace('\\', '/')
 
         if node.attrs['first_id'] != '':
           raise Exception(
               "Don't set the first_id attribute when using the first_ids_file "
               "attribute on the <grit> node, update %s instead." %
               first_ids_filename)
 
         try:
           id_list = first_ids[filename][node.name]
         except KeyError, e:
@@ skipping 78 matching lines @@
     by parameters of the same name.
     """
     node = IdentifierNode()
     node.StartParsing('identifier', parent)
     node.HandleAttribute('name', name)
     node.HandleAttribute('id', id)
     node.HandleAttribute('comment', comment)
     node.HandleAttribute('systemid', systemid)
     node.EndParsing()
     return node