Bot update!

scripts/slave/chromium_commands.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.
 
 """A subclass of commands.SVN that allows more flexible error recovery.
 
 This code is only used on the slave but it is living in common/ because it is
 directly imported from buildbot/slave/bot.py."""
 
 import os
@@ skipping 227 matching lines @@
     self.gclient_nohooks = False
     self.was_patched = False
     self.no_gclient_branch = False
     self.no_gclient_revision = False
     self.gclient_transitive = False
     self.delete_unversioned_trees_when_updating = True
     self.gclient_jobs = None
     self.project = None
     # TODO(maruel): Remove once buildbot 0.8.4p1 conversion is complete.
     self.sourcedata = None
+    self.do_nothing = None
     chromium_utils.GetParentClass(GClient).__init__(self, *args, **kwargs)
 
   def setup(self, args):
     """Our implementation of command.Commands.setup() method.
     The method will get all the arguments that are passed to remote command
     and is invoked before start() method (that will in turn call doVCUpdate()).
     """
     SourceBaseCommand.setup(self, args)
     self.vcexe = self.getCommand('gclient')
     self.svnurl = args['svnurl']
@@ skipping 24 matching lines @@
     self.command = None
 
     # self.srcdir is where the VC system should put the sources
     if self.mode == "copy":
       self.srcdir = "source" # hardwired directory name, sorry
     else:
       self.srcdir = self.workdir
     self.sourcedatafile = os.path.join(self.builder.basedir,
                                        self.srcdir,
                                        ".buildbot-sourcedata")
+    self.do_nothing = os.path.isfile(os.path.join(self.builder.basedir,
+                                                  self.srcdir,
+                                                  'update.flag'))
 
-    d = defer.succeed(None)
+    d = defer.succeed(0)
+
+    if self.do_nothing:
+      # If bot update is run, we don't need to run the traditional update step.
+      msg = 'update.flag file found: bot_update has run and checkout is \n'
+      msg += 'already in a consistent state.\n'
+      msg += 'No actions will be performed in this step.'
+      self.sendStatus({'header': msg})
+      d.addCallback(self._sendRC)
+      return d
+
     # Do we need to clobber anything?
     if self.mode in ("copy", "clobber", "export"):
       d.addCallback(self.doClobber, self.workdir)
     if not (self.sourcedirIsUpdateable() and self.sourcedataMatches()):
       # the directory cannot be updated, so we have to clobber it.
       # Perhaps the master just changed modes from 'export' to
       # 'update'.
       d.addCallback(self.doClobber, self.srcdir)
     elif self.sourcedirIsPatched():
       # The directory is patched. Revert the sources.
@@ skipping 322 matching lines @@
   try:
     # We run this code in a try because it fails with an assertion if
     # the module is loaded twice.
     commandRegistry['gclient'] = 'slave.chromium_commands.GClient'
     return
   except (AssertionError, NameError):
     pass
 
 
 RegisterCommands()