Add --break_repo_locks to gclient revert.

gclient.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.
 
 """Meta checkout manager supporting both Subversion and GIT."""
 # Files
 #   .gclient      : Current client configuration, written by 'config' command.
 #                   Format is a Python script defining 'solutions', a list whose
 #                   entries each are maps binding the strings "name" and "url"
@@ skipping 2100 matching lines @@
   parser.add_option('--deps', dest='deps_os', metavar='OS_LIST',
                     help='override deps for the specified (comma-separated) '
                          'platform(s); \'all\' will process all deps_os '
                          'references')
   parser.add_option('-n', '--nohooks', action='store_true',
                     help='don\'t run hooks after the revert is complete')
   parser.add_option('-p', '--noprehooks', action='store_true',
                     help='don\'t run pre-DEPS hooks', default=False)
   parser.add_option('--upstream', action='store_true',
                     help='Make repo state match upstream branch.')
+  parser.add_option('--break_repo_locks', action='store_true',
+                    help='GIT ONLY - Forcibly remove repo locks (e.g. '
+                      'index.lock). This should only be used if you know for '
+                      'certain that this invocation of gclient is the only '
+                      'thing operating on the git repos (e.g. on a bot).')
   (options, args) = parser.parse_args(args)
   # --force is implied.
   options.force = True
   options.reset = False
   options.delete_unversioned_trees = False
   client = GClient.LoadCurrentConfig(options)
   if not client:
     raise gclient_utils.Error('client not configured; see \'gclient config\'')
   return client.RunOnDeps('revert', args)
 
@@ skipping 193 matching lines @@
 
 
 if '__main__' == __name__:
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)
 
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