Add initial auto-roll script.

tools/push-to-trunk/push_to_trunk.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 41 matching lines @@
 }
 
 
 class Preparation(Step):
   def __init__(self):
     Step.__init__(self, "Preparation.")
 
   def RunStep(self):
     self.InitialEnvironmentChecks()
     self.CommonPrepare()
+    self.PrepareBranch()
     self.DeleteBranch(self.Config(TRUNKBRANCH))
 
 
 class FreshBranch(Step):
   def __init__(self):
     Step.__init__(self, "Create a fresh branch.")
 
   def RunStep(self):
     args = "checkout -b %s svn/bleeding_edge" % self.Config(BRANCHNAME)
     if self.Git(args) is None:
@@ skipping 408 matching lines @@
       print("Congratulations, you have successfully created the trunk "
             "revision %s. Please don't forget to roll this new version into "
             "Chromium, and to update the v8rel spreadsheet:" % ver)
     print "%s\ttrunk\t%s" % (ver, self._state["trunk_revision"])
 
     self.CommonCleanup()
     if self.Config(TRUNKBRANCH) != self._state["current_branch"]:
       self.Git("branch -D %s" % self.Config(TRUNKBRANCH))
 
 
-def RunScript(config,
-              options,
-              side_effect_handler=DEFAULT_SIDE_EFFECT_HANDLER):
+def RunPushToTrunk(config,
+                   options,
+                   side_effect_handler=DEFAULT_SIDE_EFFECT_HANDLER):
   step_classes = [
     Preparation,
     FreshBranch,
     DetectLastPush,
     PrepareChangeLog,
     EditChangeLog,
     IncrementVersion,
     CommitLocal,
     UploadStep,
     CommitRepository,
     StragglerCommits,
     SquashCommits,
     NewBranch,
     ApplyChanges,
     SetVersion,
     CommitTrunk,
     SanityCheck,
     CommitSVN,
     TagRevision,
     CheckChromium,
     SwitchChromium,
     UpdateChromiumCheckout,
     UploadCL,
     SwitchV8,
     CleanUp,
   ]
 
-  state = {}
-  steps = []
-  number = 0
-
-  for step_class in step_classes:
-    # TODO(machenbach): Factory methods.
-    step = step_class()
-    step.SetNumber(number)
-    step.SetConfig(config)
-    step.SetOptions(options)
-    step.SetState(state)
-    step.SetSideEffectHandler(side_effect_handler)
-    steps.append(step)
-    number += 1
-
-  for step in steps[options.s:]:
-    step.Run()
+  RunScript(step_classes, config, options, side_effect_handler)
 
 
 def BuildOptions():
   result = optparse.OptionParser()
   result.add_option("-s", "--step", dest="s",
                     help="Specify the step where to start work. Default: 0.",
                     default=0, type="int")
   result.add_option("-l", "--last-push", dest="l",
                     help=("Manually specify the git commit ID "
                           "of the last push to trunk."))
@@ skipping 13 matching lines @@
 def Main():
   parser = BuildOptions()
   (options, args) = parser.parse_args()
   if not ProcessOptions(options):
     parser.print_help()
     return 1
   RunScript(CONFIG, options)
 
 if __name__ == "__main__":
   sys.exit(Main())