Log error message if os.rename fails

recipe_modules/bot_update/resources/bot_update.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 # TODO(hinoka): Use logging.
 
 import cStringIO
 import codecs
 import copy
@@ skipping 281 matching lines @@
   return solutions
 
 
 def remove(target):
   """Remove a target by moving it into build.dead."""
   dead_folder = path.join(BUILDER_DIR, 'build.dead')
   if not path.exists(dead_folder):
     os.makedirs(dead_folder)
   dest = path.join(dead_folder, uuid.uuid4().hex)
   print 'Marking for removal %s => %s' % (target, dest)
-  os.rename(target, dest)
+  try:
+    os.rename(target, dest)
+  except Exception as e:
+    print 'Error renaming %s to %s: %s' % (target, dest, str(e))
+    raise
 
 
 def ensure_no_checkout(dir_names):
   """Ensure that there is no undesired checkout under build/."""
   build_dir = os.getcwd()
   has_checkout = any(path.exists(path.join(build_dir, dir_name, '.git'))
                      for dir_name in dir_names)
   if has_checkout:
     for filename in os.listdir(build_dir):
       deletion_target = path.join(build_dir, filename)
@@ skipping 783 matching lines @@
     # download patch failure is still an infra problem.
     if e.code == 3:
       # Patch download problem.
       return 87
     # Genuine patch problem.
     return 88
 
 
 if __name__ == '__main__':
   sys.exit(main())