Clear cache for runs of ctest if --cache not set.

bin/ctest.py

 #!/usr/bin/python
 #
 # Copyright (c) 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.
 
 """Wrapper for tests that are run on builders."""
 
 import fileinput
 import optparse
@@ skipping 207 matching lines @@
     fh.close()
 
   version = zip_url.split('/')[-2]
   if not _GreaterVersion(version, _NEW_STYLE_VERSION) == version:
     # If the version isn't ready for new style, touch file to use old style.
     old_style_touch_path = os.path.join(download_folder, '.use_e1000')
     fh = open(old_style_touch_path, 'w+')
     fh.close()
 
 
+def WipeDevServerCache():
+  """Wipes the cache of the dev server."""
+  RunCommand(['sudo',
+              './start_devserver',
+              '--clear_cache',
+              '--exit',
+             ], enter_chroot=True)
+
+
 def RunAUTestHarness(board, channel, latest_url_base, zip_server_base,
                      no_graphics, type, remote):
   """Runs the auto update test harness.
 
   The auto update test harness encapsulates testing the auto-update mechanism
   for the latest image against the latest official image from the channel.  This
   also tests images with suite_Smoke (built-in as part of its verification
   process).
 
   Args:
@@ skipping 29 matching lines @@
               '--remote=%s' % remote,
              ], cwd=crosutils_root)
 
 
 def main():
   parser = optparse.OptionParser()
   parser.add_option('-b', '--board',
                     help='board for the image to compare against.')
   parser.add_option('-c', '--channel',
                     help='channel for the image to compare against.')
+  parser.add_option('--cache', default=False, action='store_true',
+                    help='Cache payloads')
   parser.add_option('-l', '--latestbase',
                     help='Base url for latest links.')
   parser.add_option('-z', '--zipbase',
                     help='Base url for hosted images.')
   parser.add_option('--no_graphics', action='store_true', default=False,
                     help='Disable graphics for the vm test.')
   parser.add_option('--type', default='vm',
                     help='type of test to run: [vm, real]. Default: vm.')
   parser.add_option('--remote', default='0.0.0.0',
                     help='For real tests, ip address of the target machine.')
 
   # Set the usage to include flags.
   parser.set_usage(parser.format_help())
   (options, args) = parser.parse_args()
 
   if args:
     parser.error('Extra args found %s.' % args)
 
   if not options.board:
     parser.error('Need board for image to compare against.')
 
   if not options.channel:
     parser.error('Need channel for image to compare against.')
 
   if not options.zipbase:
     parser.error('Need zip url base to get images.')
 
+  if not options.cache:
+    Info('Wiping dev server cache.')
+    WipeDevServerCache()
+
   RunAUTestHarness(options.board, options.channel, options.latestbase,
                    options.zipbase, options.no_graphics, options.type,
                    options.remote)
 
 
 if __name__ == '__main__':
   main()