Add merge-to-branch python port.

tools/push-to-trunk/auto_roll.py

 #!/usr/bin/env python
 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 34 matching lines @@
   DOT_GIT_LOCATION: ".git",
   SETTINGS_LOCATION: "~/.auto-roll",
 }
 
 
 class AutoRollOptions(CommonOptions):
   def __init__(self, options):
     super(AutoRollOptions, self).__init__(options)
     self.requires_editor = False
     self.status_password = options.status_password
-    self.r = options.r
     self.c = options.c
     self.push = getattr(options, 'push', False)
     self.author = getattr(options, 'a', None)
 
 
 class Preparation(Step):
   MESSAGE = "Preparation."
 
   def RunStep(self):
     self.InitialEnvironmentChecks()
@@ skipping 89 matching lines @@
       print "ToT (r%d) is clean. Pushing to trunk." % latest
       self.PushTreeStatus("Tree is closed (preparing to push)")
 
       # TODO(machenbach): Update the script before calling it.
       try:
         if self._options.push:
           self._side_effect_handler.Call(
               RunPushToTrunk,
               push_to_trunk.CONFIG,
               PushToTrunkOptions.MakeForcedOptions(self._options.author,
-                                                   self._options.r,
+                                                   self._options.reviewer,
                                                    self._options.c),
               self._side_effect_handler)
       finally:
         self.PushTreeStatus(self._state["tree_message"])
     else:
       print("ToT (r%d) is ahead of the LKGR (r%d). Skipping push to trunk."
             % (latest, lkgr))
 
 
 def RunAutoRoll(config,
@@ skipping 14 matching lines @@
 def BuildOptions():
   result = optparse.OptionParser()
   result.add_option("-a", "--author", dest="a",
                     help=("Specify the author email used for rietveld."))
   result.add_option("-c", "--chromium", dest="c",
                     help=("Specify the path to your Chromium src/ "
                           "directory to automate the V8 roll."))
   result.add_option("-p", "--push",
                     help="Push to trunk if possible. Dry run if unspecified.",
                     default=False, action="store_true")
-  result.add_option("-r", "--reviewer", dest="r",
+  result.add_option("-r", "--reviewer",
                     help=("Specify the account name to be used for reviews."))
   result.add_option("-s", "--step", dest="s",
                     help="Specify the step where to start work. Default: 0.",
                     default=0, type="int")
   result.add_option("--status-password",
                     help="A file with the password to the status app.")
   return result
 
 
 def Main():
   parser = BuildOptions()
   (options, args) = parser.parse_args()
-  if not options.a or not options.c or not options.r:
+  if not options.a or not options.c or not options.reviewer:
     print "You need to specify author, chromium src location and reviewer."
     parser.print_help()
     return 1
   RunAutoRoll(CONFIG, AutoRollOptions(options))
 
 if __name__ == "__main__":
   sys.exit(Main())