Add safely-roll-webkit.py to streamline webkit rolls.

It still needs some work on the commit queue side to work correctly, at the
moment it will deny the commit because there is no LGTM.


Review URL: http://codereview.chromium.org/7089012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@93945 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 82 insertions, 0 deletions

diff --git a/tools/safely-roll-webkit.py b/tools/safely-roll-webkit.py
new file mode 100755
index 0000000..97260fb
--- /dev/null
+++ b/tools/safely-roll-webkit.py
@@ -0,0 +1,82 @@
+#!/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.
+
+"""Generate a CL to roll webkit to the specified revision number and post
+it to Rietveld so that the CL will land automatically if it passes the
+commit-queue's checks.
+"""
+
+import logging
+import optparse
+import os
+import re
+import sys
+
+import find_depot_tools
+import scm
+import subprocess2
+
+
+def die_with_error(msg):
+  print >> sys.stderr, msg
+  sys.exit(1)
+
+
+def process_deps(path, new_rev):
+  """Update webkit_revision to |new_issue|.
+
+  A bit hacky, could it be made better?
+  """
+  content = open(path).read()
+  old_line = r'(\s+)"webkit_revision": "(\d+)",'
+  new_line = r'\1"webkit_revision": "%d",' % new_rev
+  new_content = re.sub(old_line, new_line, content, 1)
+  if new_content == content:
+    die_with_error('Failed to update the DEPS file')
+  open(path, 'w').write(new_content)
+
+
+def main():
+  tool_dir = os.path.dirname(os.path.abspath(__file__))
+  parser = optparse.OptionParser(usage='<new webkit rev>')
+  parser.add_option('-v', '--verbose', action='count', default=0)
+  options, args = parser.parse_args()
+  logging.basicConfig(
+      level=
+          [logging.WARNING, logging.INFO, logging.DEBUG][
+            min(2, options.verbose)])
+  if len(args) != 1:
+    parser.error('Need only one arg: new webkit revision to roll to.')
+
+  root_dir = os.path.dirname(tool_dir)
+  os.chdir(root_dir)
+
+  new_rev = int(args[0])
+  msg = 'Roll webkit revision to %s' % new_rev
+  print msg
+
+  # Silence the editor.
+  os.environ['EDITOR'] = '/bin/true'
+
+  old_branch = scm.GIT.GetBranch(root_dir)
+  if old_branch == 'webkit_roll':
+    parser.error(
+        'Please delete the branch webkit_roll and move to a different branch')
+  subprocess2.check_output(
+      ['git', 'checkout', '-b', 'webkit_roll', 'origin/trunk'])
+  try:
+    process_deps(os.path.join(root_dir, 'DEPS'), new_rev)
+    commit_msg = msg + '\nTBR=\n'
+    subprocess2.check_output(['git', 'commit', '-m', commit_msg, 'DEPS'])
+    subprocess2.check_call(['git', 'diff', 'origin/trunk'])
+    subprocess2.check_call(['git', 'cl', 'upload', '--use-commit-queue'])
+  finally:
+    subprocess2.check_output(['git', 'checkout', old_branch])
+    subprocess2.check_output(['git', 'branch', '-D', 'webkit_roll'])
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())