src/v8/tools/release/push_to_candidates.py - cobalt - Git at Google

 #!/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
 #       disclaimer in the documentation and/or other materials provided
 #       with the distribution.
 #     * Neither the name of Google Inc. nor the names of its
 #       contributors may be used to endorse or promote products derived
 #       from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 # for py2/py3 compatibility
 from __future__ import print_function

 import argparse
 import os
 import sys
 import tempfile
 import urllib2

 from common_includes import *

 PUSH_MSG_GIT_SUFFIX = " (based on %s)"


 class Preparation(Step):
   MESSAGE = "Preparation."

   def RunStep(self):
     self.InitialEnvironmentChecks(self.default_cwd)
     self.CommonPrepare()

     if(self["current_branch"] == self.Config("CANDIDATESBRANCH")
        or self["current_branch"] == self.Config("BRANCHNAME")):
       print("Warning: Script started on branch %s" % self["current_branch"])

     self.PrepareBranch()
     self.DeleteBranch(self.Config("CANDIDATESBRANCH"))


 class FreshBranch(Step):
   MESSAGE = "Create a fresh branch."

   def RunStep(self):
     self.GitCreateBranch(self.Config("BRANCHNAME"),
                          self.vc.RemoteMasterBranch())


 class PreparePushRevision(Step):
   MESSAGE = "Check which revision to push."

   def RunStep(self):
     if self._options.revision:
       self["push_hash"] = self._options.revision
     else:
       self["push_hash"] = self.GitLog(n=1, format="%H", git_hash="HEAD")
     if not self["push_hash"]:  # pragma: no cover
       self.Die("Could not determine the git hash for the push.")


 class IncrementVersion(Step):
   MESSAGE = "Increment version number."

   def RunStep(self):
     latest_version = self.GetLatestVersion()

     # The version file on master can be used to bump up major/minor at
     # branch time.
     self.GitCheckoutFile(VERSION_FILE, self.vc.RemoteMasterBranch())
     self.ReadAndPersistVersion("master_")
     master_version = self.ArrayToVersion("master_")

     # Use the highest version from master or from tags to determine the new
     # version.
     authoritative_version = sorted(
         [master_version, latest_version], key=SortingKey)[1]
     self.StoreVersion(authoritative_version, "authoritative_")

     # Variables prefixed with 'new_' contain the new version numbers for the
     # ongoing candidates push.
     self["new_major"] = self["authoritative_major"]
     self["new_minor"] = self["authoritative_minor"]
     self["new_build"] = str(int(self["authoritative_build"]) + 1)

     # Make sure patch level is 0 in a new push.
     self["new_patch"] = "0"

     self["version"] = "%s.%s.%s" % (self["new_major"],
                                     self["new_minor"],
                                     self["new_build"])

     print ("Incremented version to %s" % self["version"])


 class DetectLastRelease(Step):
   MESSAGE = "Detect commit ID of last release base."

   def RunStep(self):
     if self._options.last_master:
       self["last_push_master"] = self._options.last_master
     else:
       self["last_push_master"] = self.GetLatestReleaseBase()


 class PrepareChangeLog(Step):
   MESSAGE = "Prepare raw ChangeLog entry."

   def RunStep(self):
     self["date"] = self.GetDate()
     output = "%s: Version %s\n\n" % (self["date"], self["version"])
     TextToFile(output, self.Config("CHANGELOG_ENTRY_FILE"))
     commits = self.GitLog(format="%H",
         git_hash="%s..%s" % (self["last_push_master"],
                              self["push_hash"]))

     # Cache raw commit messages.
     commit_messages = [
       [
         self.GitLog(n=1, format="%s", git_hash=commit),
         self.GitLog(n=1, format="%B", git_hash=commit),
         self.GitLog(n=1, format="%an", git_hash=commit),
       ] for commit in commits.splitlines()
     ]

     # Auto-format commit messages.
     body = MakeChangeLogBody(commit_messages, auto_format=True)
     AppendToFile(body, self.Config("CHANGELOG_ENTRY_FILE"))

     msg = ("        Performance and stability improvements on all platforms."
            "\n#\n# The change log above is auto-generated. Please review if "
            "all relevant\n# commit messages from the list below are included."
            "\n# All lines starting with # will be stripped.\n#\n")
     AppendToFile(msg, self.Config("CHANGELOG_ENTRY_FILE"))

     # Include unformatted commit messages as a reference in a comment.
     comment_body = MakeComment(MakeChangeLogBody(commit_messages))
     AppendToFile(comment_body, self.Config("CHANGELOG_ENTRY_FILE"))


 class EditChangeLog(Step):
   MESSAGE = "Edit ChangeLog entry."

   def RunStep(self):
     print ("Please press <Return> to have your EDITOR open the ChangeLog "
            "entry, then edit its contents to your liking. When you're done, "
            "save the file and exit your EDITOR. ")
     self.ReadLine(default="")
     self.Editor(self.Config("CHANGELOG_ENTRY_FILE"))

     # Strip comments and reformat with correct indentation.
     changelog_entry = FileToText(self.Config("CHANGELOG_ENTRY_FILE")).rstrip()
     changelog_entry = StripComments(changelog_entry)
     changelog_entry = "\n".join(map(Fill80, changelog_entry.splitlines()))
     changelog_entry = changelog_entry.lstrip()

     if changelog_entry == "":  # pragma: no cover
       self.Die("Empty ChangeLog entry.")

     # Safe new change log for adding it later to the candidates patch.
     TextToFile(changelog_entry, self.Config("CHANGELOG_ENTRY_FILE"))


 class StragglerCommits(Step):
   MESSAGE = ("Fetch straggler commits that sneaked in since this script was "
              "started.")

   def RunStep(self):
     self.vc.Fetch()
     self.GitCheckout(self.vc.RemoteMasterBranch())


 class SquashCommits(Step):
   MESSAGE = "Squash commits into one."

   def RunStep(self):
     # Instead of relying on "git rebase -i", we'll just create a diff, because
     # that's easier to automate.
     TextToFile(self.GitDiff(self.vc.RemoteCandidateBranch(),
                             self["push_hash"]),
                self.Config("PATCH_FILE"))

     # Convert the ChangeLog entry to commit message format.
     text = FileToText(self.Config("CHANGELOG_ENTRY_FILE"))

     # Remove date and trailing white space.
     text = re.sub(r"^%s: " % self["date"], "", text.rstrip())

     # Show the used master hash in the commit message.
     suffix = PUSH_MSG_GIT_SUFFIX % self["push_hash"]
     text = MSub(r"^(Version \d+\.\d+\.\d+)$", "\\1%s" % suffix, text)

     # Remove indentation and merge paragraphs into single long lines, keeping
     # empty lines between them.
     def SplitMapJoin(split_text, fun, join_text):
       return lambda text: join_text.join(map(fun, text.split(split_text)))
     strip = lambda line: line.strip()
     text = SplitMapJoin("\n\n", SplitMapJoin("\n", strip, " "), "\n\n")(text)

     if not text:  # pragma: no cover
       self.Die("Commit message editing failed.")
     self["commit_title"] = text.splitlines()[0]
     TextToFile(text, self.Config("COMMITMSG_FILE"))


 class NewBranch(Step):
   MESSAGE = "Create a new branch from candidates."

   def RunStep(self):
     self.GitCreateBranch(self.Config("CANDIDATESBRANCH"),
                          self.vc.RemoteCandidateBranch())


 class ApplyChanges(Step):
   MESSAGE = "Apply squashed changes."

   def RunStep(self):
     self.ApplyPatch(self.Config("PATCH_FILE"))
     os.remove(self.Config("PATCH_FILE"))
     # The change log has been modified by the patch. Reset it to the version
     # on candidates and apply the exact changes determined by this
     # PrepareChangeLog step above.
     self.GitCheckoutFile(CHANGELOG_FILE, self.vc.RemoteCandidateBranch())
     # The version file has been modified by the patch. Reset it to the version
     # on candidates.
     self.GitCheckoutFile(VERSION_FILE, self.vc.RemoteCandidateBranch())


 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("CANDIDATESBRANCH"))
     self.GitCreateBranch(self.Config("CANDIDATESBRANCH"),
                          self.vc.RemoteCandidateBranch())


 class AddChangeLog(Step):
   MESSAGE = "Add ChangeLog changes to candidates branch."

   def RunStep(self):
     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 candidates."

   def RunStep(self):
     self.SetVersion(os.path.join(self.default_cwd, VERSION_FILE), "new_")


 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):
     # TODO(machenbach): Run presubmit script here as it is now missing in the
     # prepare push process.
     if not self.Confirm("Please check if your local checkout is sane: Inspect "
         "%s, compile, run tests. Do you want to commit this new candidates "
         "revision to the repository?" % VERSION_FILE):
       self.Die("Execution canceled.")  # pragma: no cover


 class Land(Step):
   MESSAGE = "Land the patch."

   def RunStep(self):
     self.vc.CLLand()


 class TagRevision(Step):
   MESSAGE = "Tag the new revision."

   def RunStep(self):
     self.vc.Tag(
         self["version"], self.vc.RemoteCandidateBranch(), self["commit_title"])


 class CleanUp(Step):
   MESSAGE = "Done!"

   def RunStep(self):
     print("Congratulations, you have successfully created the candidates "
           "revision %s."
           % self["version"])

     self.CommonCleanup()
     if self.Config("CANDIDATESBRANCH") != self["current_branch"]:
       self.GitDeleteBranch(self.Config("CANDIDATESBRANCH"))


 class PushToCandidates(ScriptsBase):
   def _PrepareOptions(self, parser):
     group = parser.add_mutually_exclusive_group()
     group.add_argument("-f", "--force",
                       help="Don't prompt the user.",
                       default=False, action="store_true")
     group.add_argument("-m", "--manual",
                       help="Prompt the user at every important step.",
                       default=False, action="store_true")
     parser.add_argument("-b", "--last-master",
                         help=("The git commit ID of the last master "
                               "revision that was pushed to candidates. This is"
                               " used for the auto-generated ChangeLog entry."))
     parser.add_argument("-l", "--last-push",
                         help="The git commit ID of the last candidates push.")
     parser.add_argument("-R", "--revision",
                         help="The git commit ID to push (defaults to HEAD).")

   def _ProcessOptions(self, options):  # pragma: no cover
     if not options.manual and not options.reviewer:
       print("A reviewer (-r) is required in (semi-)automatic mode.")
       return False
     if not options.manual and not options.author:
       print("Specify your chromium.org email with -a in (semi-)automatic mode.")
       return False

     options.tbr_commit = not options.manual
     return True

   def _Config(self):
     return {
       "BRANCHNAME": "prepare-push",
       "CANDIDATESBRANCH": "candidates-push",
       "PERSISTFILE_BASENAME": "/tmp/v8-push-to-candidates-tempfile",
       "CHANGELOG_ENTRY_FILE":
           "/tmp/v8-push-to-candidates-tempfile-changelog-entry",
       "PATCH_FILE": "/tmp/v8-push-to-candidates-tempfile-patch-file",
       "COMMITMSG_FILE": "/tmp/v8-push-to-candidates-tempfile-commitmsg",
     }

   def _Steps(self):
     return [
       Preparation,
       FreshBranch,
       PreparePushRevision,
       IncrementVersion,
       DetectLastRelease,
       PrepareChangeLog,
       EditChangeLog,
       StragglerCommits,
       SquashCommits,
       NewBranch,
       ApplyChanges,
       CommitSquash,
       SanityCheck,
       Land,
       PrepareVersionBranch,
       AddChangeLog,
       SetVersion,
       CommitCandidate,
       Land,
       TagRevision,
       CleanUp,
     ]


 if __name__ == "__main__":  # pragma: no cover
   sys.exit(PushToCandidates().Run())
	#!/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
	# disclaimer in the documentation and/or other materials provided
	# with the distribution.
	# * Neither the name of Google Inc. nor the names of its
	# contributors may be used to endorse or promote products derived
	# from this software without specific prior written permission.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	# for py2/py3 compatibility
	from __future__ import print_function

	import argparse
	import os
	import sys
	import tempfile
	import urllib2

	from common_includes import *

	PUSH_MSG_GIT_SUFFIX = " (based on %s)"


	class Preparation(Step):
	MESSAGE = "Preparation."

	def RunStep(self):
	self.InitialEnvironmentChecks(self.default_cwd)
	self.CommonPrepare()

	if(self["current_branch"] == self.Config("CANDIDATESBRANCH")
	or self["current_branch"] == self.Config("BRANCHNAME")):
	print("Warning: Script started on branch %s" % self["current_branch"])

	self.PrepareBranch()
	self.DeleteBranch(self.Config("CANDIDATESBRANCH"))


	class FreshBranch(Step):
	MESSAGE = "Create a fresh branch."

	def RunStep(self):
	self.GitCreateBranch(self.Config("BRANCHNAME"),
	self.vc.RemoteMasterBranch())


	class PreparePushRevision(Step):
	MESSAGE = "Check which revision to push."

	def RunStep(self):
	if self._options.revision:
	self["push_hash"] = self._options.revision
	else:
	self["push_hash"] = self.GitLog(n=1, format="%H", git_hash="HEAD")
	if not self["push_hash"]: # pragma: no cover
	self.Die("Could not determine the git hash for the push.")


	class IncrementVersion(Step):
	MESSAGE = "Increment version number."

	def RunStep(self):
	latest_version = self.GetLatestVersion()

	# The version file on master can be used to bump up major/minor at
	# branch time.
	self.GitCheckoutFile(VERSION_FILE, self.vc.RemoteMasterBranch())
	self.ReadAndPersistVersion("master_")
	master_version = self.ArrayToVersion("master_")

	# Use the highest version from master or from tags to determine the new
	# version.
	authoritative_version = sorted(
	[master_version, latest_version], key=SortingKey)[1]
	self.StoreVersion(authoritative_version, "authoritative_")

	# Variables prefixed with 'new_' contain the new version numbers for the
	# ongoing candidates push.
	self["new_major"] = self["authoritative_major"]
	self["new_minor"] = self["authoritative_minor"]
	self["new_build"] = str(int(self["authoritative_build"]) + 1)

	# Make sure patch level is 0 in a new push.
	self["new_patch"] = "0"

	self["version"] = "%s.%s.%s" % (self["new_major"],
	self["new_minor"],
	self["new_build"])

	print ("Incremented version to %s" % self["version"])


	class DetectLastRelease(Step):
	MESSAGE = "Detect commit ID of last release base."

	def RunStep(self):
	if self._options.last_master:
	self["last_push_master"] = self._options.last_master
	else:
	self["last_push_master"] = self.GetLatestReleaseBase()


	class PrepareChangeLog(Step):
	MESSAGE = "Prepare raw ChangeLog entry."

	def RunStep(self):
	self["date"] = self.GetDate()
	output = "%s: Version %s\n\n" % (self["date"], self["version"])
	TextToFile(output, self.Config("CHANGELOG_ENTRY_FILE"))
	commits = self.GitLog(format="%H",
	git_hash="%s..%s" % (self["last_push_master"],
	self["push_hash"]))

	# Cache raw commit messages.
	commit_messages = [
	[
	self.GitLog(n=1, format="%s", git_hash=commit),
	self.GitLog(n=1, format="%B", git_hash=commit),
	self.GitLog(n=1, format="%an", git_hash=commit),
	] for commit in commits.splitlines()
	]

	# Auto-format commit messages.
	body = MakeChangeLogBody(commit_messages, auto_format=True)
	AppendToFile(body, self.Config("CHANGELOG_ENTRY_FILE"))

	msg = (" Performance and stability improvements on all platforms."
	"\n#\n# The change log above is auto-generated. Please review if "
	"all relevant\n# commit messages from the list below are included."
	"\n# All lines starting with # will be stripped.\n#\n")
	AppendToFile(msg, self.Config("CHANGELOG_ENTRY_FILE"))

	# Include unformatted commit messages as a reference in a comment.
	comment_body = MakeComment(MakeChangeLogBody(commit_messages))
	AppendToFile(comment_body, self.Config("CHANGELOG_ENTRY_FILE"))


	class EditChangeLog(Step):
	MESSAGE = "Edit ChangeLog entry."

	def RunStep(self):
	print ("Please press <Return> to have your EDITOR open the ChangeLog "
	"entry, then edit its contents to your liking. When you're done, "
	"save the file and exit your EDITOR. ")
	self.ReadLine(default="")
	self.Editor(self.Config("CHANGELOG_ENTRY_FILE"))

	# Strip comments and reformat with correct indentation.
	changelog_entry = FileToText(self.Config("CHANGELOG_ENTRY_FILE")).rstrip()
	changelog_entry = StripComments(changelog_entry)
	changelog_entry = "\n".join(map(Fill80, changelog_entry.splitlines()))
	changelog_entry = changelog_entry.lstrip()

	if changelog_entry == "": # pragma: no cover
	self.Die("Empty ChangeLog entry.")

	# Safe new change log for adding it later to the candidates patch.
	TextToFile(changelog_entry, self.Config("CHANGELOG_ENTRY_FILE"))


	class StragglerCommits(Step):
	MESSAGE = ("Fetch straggler commits that sneaked in since this script was "
	"started.")

	def RunStep(self):
	self.vc.Fetch()
	self.GitCheckout(self.vc.RemoteMasterBranch())


	class SquashCommits(Step):
	MESSAGE = "Squash commits into one."

	def RunStep(self):
	# Instead of relying on "git rebase -i", we'll just create a diff, because
	# that's easier to automate.
	TextToFile(self.GitDiff(self.vc.RemoteCandidateBranch(),
	self["push_hash"]),
	self.Config("PATCH_FILE"))

	# Convert the ChangeLog entry to commit message format.
	text = FileToText(self.Config("CHANGELOG_ENTRY_FILE"))

	# Remove date and trailing white space.
	text = re.sub(r"^%s: " % self["date"], "", text.rstrip())

	# Show the used master hash in the commit message.
	suffix = PUSH_MSG_GIT_SUFFIX % self["push_hash"]
	text = MSub(r"^(Version \d+\.\d+\.\d+)$", "\\1%s" % suffix, text)

	# Remove indentation and merge paragraphs into single long lines, keeping
	# empty lines between them.
	def SplitMapJoin(split_text, fun, join_text):
	return lambda text: join_text.join(map(fun, text.split(split_text)))
	strip = lambda line: line.strip()
	text = SplitMapJoin("\n\n", SplitMapJoin("\n", strip, " "), "\n\n")(text)

	if not text: # pragma: no cover
	self.Die("Commit message editing failed.")
	self["commit_title"] = text.splitlines()[0]
	TextToFile(text, self.Config("COMMITMSG_FILE"))


	class NewBranch(Step):
	MESSAGE = "Create a new branch from candidates."

	def RunStep(self):
	self.GitCreateBranch(self.Config("CANDIDATESBRANCH"),
	self.vc.RemoteCandidateBranch())


	class ApplyChanges(Step):
	MESSAGE = "Apply squashed changes."

	def RunStep(self):
	self.ApplyPatch(self.Config("PATCH_FILE"))
	os.remove(self.Config("PATCH_FILE"))
	# The change log has been modified by the patch. Reset it to the version
	# on candidates and apply the exact changes determined by this
	# PrepareChangeLog step above.
	self.GitCheckoutFile(CHANGELOG_FILE, self.vc.RemoteCandidateBranch())
	# The version file has been modified by the patch. Reset it to the version
	# on candidates.
	self.GitCheckoutFile(VERSION_FILE, self.vc.RemoteCandidateBranch())


	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("CANDIDATESBRANCH"))
	self.GitCreateBranch(self.Config("CANDIDATESBRANCH"),
	self.vc.RemoteCandidateBranch())


	class AddChangeLog(Step):
	MESSAGE = "Add ChangeLog changes to candidates branch."

	def RunStep(self):
	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 candidates."

	def RunStep(self):
	self.SetVersion(os.path.join(self.default_cwd, VERSION_FILE), "new_")


	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):
	# TODO(machenbach): Run presubmit script here as it is now missing in the
	# prepare push process.
	if not self.Confirm("Please check if your local checkout is sane: Inspect "
	"%s, compile, run tests. Do you want to commit this new candidates "
	"revision to the repository?" % VERSION_FILE):
	self.Die("Execution canceled.") # pragma: no cover


	class Land(Step):
	MESSAGE = "Land the patch."

	def RunStep(self):
	self.vc.CLLand()


	class TagRevision(Step):
	MESSAGE = "Tag the new revision."

	def RunStep(self):
	self.vc.Tag(
	self["version"], self.vc.RemoteCandidateBranch(), self["commit_title"])


	class CleanUp(Step):
	MESSAGE = "Done!"

	def RunStep(self):
	print("Congratulations, you have successfully created the candidates "
	"revision %s."
	% self["version"])

	self.CommonCleanup()
	if self.Config("CANDIDATESBRANCH") != self["current_branch"]:
	self.GitDeleteBranch(self.Config("CANDIDATESBRANCH"))


	class PushToCandidates(ScriptsBase):
	def _PrepareOptions(self, parser):
	group = parser.add_mutually_exclusive_group()
	group.add_argument("-f", "--force",
	help="Don't prompt the user.",
	default=False, action="store_true")
	group.add_argument("-m", "--manual",
	help="Prompt the user at every important step.",
	default=False, action="store_true")
	parser.add_argument("-b", "--last-master",
	help=("The git commit ID of the last master "
	"revision that was pushed to candidates. This is"
	" used for the auto-generated ChangeLog entry."))
	parser.add_argument("-l", "--last-push",
	help="The git commit ID of the last candidates push.")
	parser.add_argument("-R", "--revision",
	help="The git commit ID to push (defaults to HEAD).")

	def _ProcessOptions(self, options): # pragma: no cover
	if not options.manual and not options.reviewer:
	print("A reviewer (-r) is required in (semi-)automatic mode.")
	return False
	if not options.manual and not options.author:
	print("Specify your chromium.org email with -a in (semi-)automatic mode.")
	return False

	options.tbr_commit = not options.manual
	return True

	def _Config(self):
	return {
	"BRANCHNAME": "prepare-push",
	"CANDIDATESBRANCH": "candidates-push",
	"PERSISTFILE_BASENAME": "/tmp/v8-push-to-candidates-tempfile",
	"CHANGELOG_ENTRY_FILE":
	"/tmp/v8-push-to-candidates-tempfile-changelog-entry",
	"PATCH_FILE": "/tmp/v8-push-to-candidates-tempfile-patch-file",
	"COMMITMSG_FILE": "/tmp/v8-push-to-candidates-tempfile-commitmsg",
	}

	def _Steps(self):
	return [
	Preparation,
	FreshBranch,
	PreparePushRevision,
	IncrementVersion,
	DetectLastRelease,
	PrepareChangeLog,
	EditChangeLog,
	StragglerCommits,
	SquashCommits,
	NewBranch,
	ApplyChanges,
	CommitSquash,
	SanityCheck,
	Land,
	PrepareVersionBranch,
	AddChangeLog,
	SetVersion,
	CommitCandidate,
	Land,
	TagRevision,
	CleanUp,
	]


	if __name__ == "__main__": # pragma: no cover
	sys.exit(PushToCandidates().Run())