Escape paths used in regexs for pylint

presubmit_canned_checks.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.
 
 """Generic presubmit checks that can be reused by other presubmit checks."""
 
 import os as _os
 _HERE = _os.path.dirname(_os.path.abspath(__file__))
 
 
@@ skipping 623 matching lines @@
   white_list = tuple(white_list or ('.*\.py$',))
   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
   extra_paths_list = extra_paths_list or []
 
   if input_api.is_committing:
     error_type = output_api.PresubmitError
   else:
     error_type = output_api.PresubmitPromptWarning
 
   # Only trigger if there is at least one python file affected.
-  rel_path = lambda x : input_api.os_path.join(input_api.os_path.relpath(
-      input_api.PresubmitLocalPath(), input_api.change.RepositoryRoot()), x)
+  def rel_path(regex):
+    """Modifies a regex for a subject to accept paths relative to root."""
+    prefix = input_api.os_path.join(input_api.os_path.relpath(
+        input_api.PresubmitLocalPath(), input_api.change.RepositoryRoot()), '')
+    return input_api.re.escape(prefix) + regex
   src_filter = lambda x: input_api.FilterSourceFile(
       x, map(rel_path, white_list), map(rel_path, black_list))
   if not input_api.AffectedSourceFiles(src_filter):
     input_api.logging.info('Skipping pylint: no matching changes.')
     return []
 
   extra_args = ['--rcfile=%s' % input_api.os_path.join(_HERE, 'pylintrc')]
   if disabled_warnings:
     extra_args.extend(['-d', ','.join(disabled_warnings)])
 
@@ skipping 337 matching lines @@
     snapshot("checking description")
     results.extend(input_api.canned_checks.CheckChangeHasDescription(
         input_api, output_api))
     results.extend(input_api.canned_checks.CheckDoNotSubmitInDescription(
         input_api, output_api))
     snapshot("checking do not submit in files")
     results.extend(input_api.canned_checks.CheckDoNotSubmitInFiles(
         input_api, output_api))
   snapshot("done")
   return results