blob: 4babf1114e4632957fd484441e8e4b1dcd78aea6 [file] [log] [blame]
#!/usr/bin/env python
# Copyright (c) 2011 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.
"""Update third_party/WebKit using git.
Under the assumption third_party/WebKit is a clone of,
we can use git commands to make it match the version requested by DEPS.
See for details on
how to use this.
import logging
import optparse
import os
import re
import subprocess
import sys
import urllib
def RunGit(command):
"""Run a git subcommand, returning its output."""
# On Windows, use shell=True to get PATH interpretation.
command = ['git'] + command' '.join(command))
shell = ( == 'nt')
proc = subprocess.Popen(command, shell=shell, stdout=subprocess.PIPE)
out = proc.communicate()[0].strip()'Returned "%s"' % out)
return out
def GetOverrideShortBranchName():
"""Returns the user-configured override branch name, if any."""
override_config_name = 'chromium.sync-branch'
return RunGit(['config', '--get', override_config_name])
def GetGClientBranchName():
"""Returns the name of the magic branch that lets us know that DEPS is
managing the update cycle."""
# Is there an override branch specified?
override_branch_name = GetOverrideShortBranchName()
if not override_branch_name:
return 'refs/heads/gclient' # No override, so return the default branch.
# Verify that the branch from config exists.
ref_branch = 'refs/heads/' + override_branch_name
current_head = RunGit(['show-ref', '--hash', ref_branch])
if current_head:
return ref_branch
# Inform the user about the problem and how to fix it.
print ("The specified override branch ('%s') doesn't appear to exist." %
print "Please fix your git config value '%s'." % overide_config_name
def GetWebKitRev():
"""Extract the 'webkit_revision' variable out of DEPS."""
locals = {'Var': lambda _: locals["vars"][_],
'From': lambda *args: None}
execfile('DEPS', {}, locals)
return locals['vars']['webkit_revision']
def GetWebKitRevFromTarball(version):
"""Extract the 'webkit_revision' variable out of tarball DEPS."""
deps_url = "" + version + "/DEPS"
f = urllib.urlopen(deps_url)
s =
m ='(?<=/Source@)\w+', s)
def HasGitRev(target_rev):
"""Finds if a git hash exists in the repository."""
cmd = ['git', 'rev-list', '--max-count=1', target_rev]' '.join(cmd))
result =, shell=( == 'nt'), stdout=subprocess.PIPE)
return result == 0
def GetRemote():
branch = GetOverrideShortBranchName()
if not branch:
branch = 'gclient'
remote = RunGit(['config', '--get', 'branch.' + branch + '.remote'])
if remote:
return remote
return 'origin'
def UpdateGClientBranch(webkit_rev, magic_gclient_branch):
"""Update the magic gclient branch to point at |webkit_rev|.
Returns: true if the branch didn't need changes."""
if not HasGitRev(webkit_rev):
print "%s not available; fetching." % webkit_rev
subprocess.check_call(['git', 'fetch', GetRemote()],
shell=( == 'nt'))
if not HasGitRev(webkit_rev):
print "ERROR: Couldn't find %s in the repository." % webkit_rev
current = RunGit(['show-ref', '--hash', magic_gclient_branch])
if current == webkit_rev:
return False # No change necessary.
subprocess.check_call(['git', 'update-ref', '-m', 'gclient sync',
magic_gclient_branch, webkit_rev],
shell=( == 'nt'))
return True
def UpdateCurrentCheckoutIfAppropriate(magic_gclient_branch):
"""Reset the current gclient branch if that's what we have checked out."""
branch = RunGit(['symbolic-ref', '-q', 'HEAD'])
if branch != magic_gclient_branch:
print "We have now updated the 'gclient' branch, but third_party/WebKit"
print "has some other branch ('%s') checked out." % branch
print "Run 'git checkout gclient' under third_party/WebKit if you want"
print "to switch it to the version requested by DEPS."
return 1
if['git', 'diff-index', '--exit-code', '--shortstat',
'HEAD'], shell=( == 'nt')):
print "Resetting tree state to new revision."
subprocess.check_call(['git', 'reset', '--hard'], shell=( == 'nt'))
def main():
parser = optparse.OptionParser()
parser.add_option('-v', '--verbose', action='store_true')
parser.add_option('-r', '--revision', help="switch to desired revision")
parser.add_option('-t', '--tarball', help="switch to desired tarball release")
options, args = parser.parse_args()
if options.verbose:
if not os.path.exists('third_party/WebKit/.git'):
if os.path.exists('third_party/WebKit'):
print "ERROR: third_party/WebKit appears to not be under git control."
print "ERROR: third_party/WebKit could not be found."
print "Did you run this script from the right directory?"
print "See for"
print "setup instructions."
return 1
if options.revision:
webkit_rev = options.revision
if options.tarball:
print "WARNING: --revision is given, so ignore --tarball"
if options.tarball:
webkit_rev = GetWebKitRevFromTarball(options.tarball)
webkit_rev = GetWebKitRev()
print 'Desired revision: %s.' % webkit_rev
magic_gclient_branch = GetGClientBranchName()
changed = UpdateGClientBranch(webkit_rev, magic_gclient_branch)
if changed:
return UpdateCurrentCheckoutIfAppropriate(magic_gclient_branch)
print "Already on correct revision."
return 0
if __name__ == '__main__':