Bot update!

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 cStringIO
 import errno
 import fnmatch
@@ skipping 389 matching lines @@
   Even with all this, Windows still sometimes fails to delete a file, citing
   a permission error (maybe something to do with antivirus scans or disk
   indexing).  The best suggestion any of the user forums had was to wait a
   bit and try again, so we do that too.  It's hand-waving, but sometimes it
   works. :/
   """
   file_path = os.path.join(*path)
   if not os.path.exists(file_path):
     return
 
+  if os.path.isfile(os.path.join(file_path, 'update.flag')):
+    print 'update.flag file found: bot_update has run and checkout is already '
+    print 'in a consistent state. No actions will be performed in this step.'
+    return
+
   if sys.platform == 'win32':
     # Give up and use cmd.exe's rd command.
     file_path = os.path.normcase(file_path)
     for _ in xrange(3):
       if not subprocess.call(['cmd.exe', '/c', 'rd', '/q', '/s', file_path]):
         break
       time.sleep(3)
     return
 
   def RemoveWithRetry_non_win(rmfunc, path):
@@ skipping 916 matching lines @@
   module_file = os.path.splitext(module_file)[0]
 
   saved = sys.path
   sys.path = [dir_path] + (extra_paths or [])
   try:
     return __import__(module_file)
   except ImportError:
     pass
   finally:
     sys.path = saved