Push version and changelog as a separate commit.

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 269 matching lines @@
 
 
 class ApplyChanges(Step):
   MESSAGE = "Apply squashed changes."
 
   def RunStep(self):
     self.ApplyPatch(self.Config("PATCH_FILE"))
     os.remove(self.Config("PATCH_FILE"))
 
 
+class CommitSquash(Step):
+  MESSAGE = "Commit to local candidates branch."
+
+  def RunStep(self):
+    # Make a first commit with a slightly different title to not confuse
+    # the tagging.
+    msg = FileToText(self.Config("COMMITMSG_FILE")).splitlines()
+    msg[0] = msg[0].replace("(based on", "(squashed - based on")
+    self.GitCommit(message = "\n".join(msg))
+
+
+class PrepareVersionBranch(Step):
+  MESSAGE = "Prepare new branch to commit version and changelog file."
+
+  def RunStep(self):
+    self.GitCheckout("master")
+    self.Git("fetch")
+    self.GitDeleteBranch(self.Config("TRUNKBRANCH"))
+    self.GitCreateBranch(self.Config("TRUNKBRANCH"),
+                         self.vc.RemoteCandidateBranch())
+
+
 class AddChangeLog(Step):
   MESSAGE = "Add ChangeLog changes to trunk branch."
 
   def RunStep(self):
     # The change log has been modified by the patch. Reset it to the version
     # on trunk and apply the exact changes determined by this PrepareChangeLog
     # step above.
     self.GitCheckoutFile(CHANGELOG_FILE, self.vc.RemoteCandidateBranch())
     changelog_entry = FileToText(self.Config("CHANGELOG_ENTRY_FILE"))
     old_change_log = FileToText(os.path.join(self.default_cwd, CHANGELOG_FILE))
     new_change_log = "%s\n\n\n%s" % (changelog_entry, old_change_log)
     TextToFile(new_change_log, os.path.join(self.default_cwd, CHANGELOG_FILE))
     os.remove(self.Config("CHANGELOG_ENTRY_FILE"))
 
 
 class SetVersion(Step):
   MESSAGE = "Set correct version for trunk."
 
   def RunStep(self):
     # The version file has been modified by the patch. Reset it to the version
     # on trunk and apply the correct version.
     self.GitCheckoutFile(VERSION_FILE, self.vc.RemoteCandidateBranch())
     self.SetVersion(os.path.join(self.default_cwd, VERSION_FILE), "new_")
 
 
-class CommitTrunk(Step):
-  MESSAGE = "Commit to local trunk branch."
+class CommitCandidate(Step):
+  MESSAGE = "Commit version and changelog to local candidates branch."
 
   def RunStep(self):
     self.GitCommit(file_name = self.Config("COMMITMSG_FILE"))
     os.remove(self.Config("COMMITMSG_FILE"))
 
 
 class SanityCheck(Step):
   MESSAGE = "Sanity check."
 
   def RunStep(self):
@@ skipping 79 matching lines @@
       PreparePushRevision,
       DetectLastPush,
       GetLatestVersion,
       IncrementVersion,
       PrepareChangeLog,
       EditChangeLog,
       StragglerCommits,
       SquashCommits,
       NewBranch,
       ApplyChanges,
+      CommitSquash,
+      SanityCheck,
+      Land,
+      PrepareVersionBranch,
       AddChangeLog,
       SetVersion,
-      CommitTrunk,
-      SanityCheck,
+      CommitCandidate,
       Land,
       TagRevision,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(PushToTrunk().Run())