Fix devserver with handling custom labels.

devserver.py

 # Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import optparse
 import os
 import sys
 import web
 
 import autoupdate
@@ skipping 75 matching lines @@
   parser.add_option('--client_prefix', dest='client_prefix',
                     help='Required prefix for client software version.',
                     default='MementoSoftwareUpdate')
   parser.add_option('--factory_config', dest='factory_config',
                     help='Config file for serving images from factory floor.')
   parser.add_option('--image', dest='image',
                     help='Force update using this image.')
   parser.add_option('-t', action='store_true', dest='test_image')
   parser.add_option('-u', '--urlbase', dest='urlbase',
                     help='base URL, other than devserver, for update images.')
+  parser.add_option('--use_cached', action="store_true", default=False,
+                    help='Prefer cached image regardless of timestamps.')
   parser.add_option('--validate_factory_config', action="store_true",
                     dest='validate_factory_config',
                     help='Validate factory config file, then exit.')
   # Clean up the args, due to httpserver's hardcoded use of sys.argv.
   options, sys.argv = parser.parse_args(sys.argv)
 
   root_dir = os.path.realpath('%s/../..' %
                               os.path.dirname(os.path.abspath(sys.argv[0])))
 
   serve_only = False
@@ skipping 11 matching lines @@
   web.debug('Serving from %s' % static_dir)
 
   updater = autoupdate.Autoupdate(
       root_dir=root_dir,
       static_dir=static_dir,
       serve_only=serve_only,
       urlbase=options.urlbase,
       test_image=options.test_image,
       factory_config_path=options.factory_config,
       client_prefix=options.client_prefix,
-      forced_image=options.image)
+      forced_image=options.image,
+      use_cached=options.use_cached)
 
   if options.factory_config:
      updater.ImportFactoryConfigFile(options.factory_config,
                                      options.validate_factory_config)
 
   if not options.validate_factory_config:
     # We do not need to run the dev server for validating the factory config.
     # TODO(nsanders): Write unit test to validate.
     urls = ('/', 'index',
             '/update', 'update',
             '/update/(.+)', 'update',
             '/build', 'build')
 
     # Overrides the default WSGIServer routine -- see OverrideWSGIServer.
     web.httpserver.WSGIServer = OverrideWSGIServer
     app = web.application(urls, globals(), autoreload=True)
     render = web.template.render('templates/')
     app.run()