tools/safely-roll-webkit.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """Generate a CL to roll webkit to the specified revision number and post
   7 it to Rietveld so that the CL will land automatically if it passes the
   8 commit-queue's checks.
   9 """
  10
  11 import logging
  12 import optparse
  13 import os
  14 import re
  15 import sys
  16
  17 import find_depot_tools
  18 import scm
  19 import subprocess2
  20
  21
  22 def die_with_error(msg):
  23   print >> sys.stderr, msg
  24   sys.exit(1)
  25
  26
  27 def process_deps(path, new_rev):
  28   """Update webkit_revision to |new_issue|.
  29
  30   A bit hacky, could it be made better?
  31   """
  32   content = open(path).read()
  33   old_line = r'(\s+)"webkit_revision": "(\d+)",'
  34   new_line = r'\1"webkit_revision": "%d",' % new_rev
  35   new_content = re.sub(old_line, new_line, content, 1)
  36   old_rev = re.search(old_line, content).group(2)
  37   if not old_rev or new_content == content:
  38     die_with_error('Failed to update the DEPS file')
  39
  40   open(path, 'w').write(new_content)
  41   return old_rev
  42
  43
  44 def main():
  45   tool_dir = os.path.dirname(os.path.abspath(__file__))
  46   parser = optparse.OptionParser(usage='<new webkit rev>')
  47   parser.add_option('-v', '--verbose', action='count', default=0)
  48   parser.add_option('--commit', action='store_true', default=True,
  49                     help='(default) Put change in commit queue on upload.')
  50   parser.add_option('--no-commit', action='store_false', dest='commit',
  51                     help='Don\'t put change in commit queue on upload.')
  52   parser.add_option('-r', '--reviewers', default='',
  53                     help='Add given users as either reviewers or TBR as'
  54                     ' appropriate.')
  55   parser.add_option('--upstream', default='origin/master',
  56                     help='(default "%default") Use given start point for change'
  57                     ' to upload. For instance, if you use the old git workflow,'
  58                     ' you might set it to "origin/trunk".')
  59   parser.add_option('--cc', help='CC email addresses for issue.')
  60
  61   options, args = parser.parse_args()
  62   logging.basicConfig(
  63       level=
  64           [logging.WARNING, logging.INFO, logging.DEBUG][
  65             min(2, options.verbose)])
  66   if len(args) != 1:
  67     parser.error('Need only one arg: new webkit revision to roll to.')
  68
  69   root_dir = os.path.dirname(tool_dir)
  70   os.chdir(root_dir)
  71
  72   new_rev = int(args[0])
  73   print 'Roll webkit revision to %s' % new_rev
  74
  75   # Silence the editor.
  76   os.environ['EDITOR'] = 'true'
  77
  78   old_branch = scm.GIT.GetBranch(root_dir)
  79   if old_branch == 'webkit_roll':
  80     parser.error(
  81         'Please delete the branch webkit_roll and move to a different branch')
  82   subprocess2.check_output(
  83       ['git', 'checkout', '-b', 'webkit_roll', options.upstream])
  84   try:
  85     old_rev = process_deps(os.path.join(root_dir, 'DEPS'), new_rev)
  86     review_field = 'TBR' if options.commit else 'R'
  87     commit_msg = 'Webkit roll %s:%s\n\n%s=%s\n' % (old_rev, new_rev,
  88                                                    review_field,
  89                                                    options.reviewers)
  90     subprocess2.check_output(['git', 'commit', '-m', commit_msg, 'DEPS'])
  91     subprocess2.check_call(['git', 'diff', options.upstream])
  92     upload_cmd = ['git', 'cl', 'upload']
  93     if options.commit:
  94       upload_cmd.append('--use-commit-queue')
  95     if options.reviewers:
  96       upload_cmd.append('--send-mail')
  97     if options.cc:
  98       upload_cmd.extend(['--cc', options.cc])
  99     subprocess2.check_call(upload_cmd)
 100   finally:
 101     subprocess2.check_output(['git', 'checkout', old_branch])
 102     subprocess2.check_output(['git', 'branch', '-D', 'webkit_roll'])
 103   return 0
 104
 105
 106 if __name__ == '__main__':
 107   sys.exit(main())