Add git cherry picking extension

git_cherry_pick_upload.py

Index: git_cherry_pick_upload.py
diff --git a/git_cherry_pick_upload.py b/git_cherry_pick_upload.py
new file mode 100755
index 0000000000000000000000000000000000000000..2a048faae37db55c2f2a920bb8f685cfdfe4f7ae
--- /dev/null
+++ b/git_cherry_pick_upload.py
@@ -0,0 +1,144 @@
+#!/usr/bin/env python
+# Copyright 2014 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.
+
+"""Upload a cherry pick CL to rietveld."""
+
+import argparse
+import md5
+import subprocess2
+import sys
+
+from git_cl import Changelist
+from git_common import config, run
+from third_party.upload import EncodeMultipartFormData, GitVCS
+from rietveld import Rietveld
+
+
+def cherry_pick(target_branch, commit):
+  """Attempt to upload a cherry pick CL to rietveld.
+
+  Args:
+    target_branch: The branch to cherry pick onto.
+    commit: The git hash of the commit to cherry pick.
+  """
+  author = config('user.email')
+
+  description = '%s\n\n(cherry picked from commit %s)\n' % (
+      run('show', '--pretty=%B', '--quiet', commit), commit)
+
+  parent = run('show', '--pretty=%P', '--quiet', commit)
+  print 'Found parent revision:', parent
+
+  class Options(object):
+    def __init__(self):
+      self.emulate_svn_auto_props = False
+
+  content_type, payload = EncodeMultipartFormData([
+      ('base', '%s@%s' % (Changelist().GetRemoteUrl(), target_branch)),
+      ('cc', config('rietveld.cc')),
+      ('content_upload', '1'),
+      ('description', description),
+      ('project', '%s@%s' % (config('rietveld.project'), target_branch)),
+      ('subject', description.splitlines()[0]),
+      ('user', author),
+  ], [
+      ('data', 'data.diff', GitVCS(Options()).PostProcessDiff(
+          run('diff', parent, commit))),
+  ])
+
+  rietveld = Rietveld(config('rietveld.server'), author, None)
+  # pylint: disable=W0212
+  output = rietveld._send(
+    '/upload',
+    payload=payload,
+    content_type=content_type,
+  ).splitlines()
+
+  # If successful, output will look like:
+  # Issue created. URL: https://codereview.chromium.org/1234567890
+  # 1
+  # 10001 some/path/first.file
+  # 10002 some/path/second.file
+  # 10003 some/path/third.file
+
+  if output[0].startswith('Issue created. URL: '):
+    print output[0]
+    issue = output[0].rsplit('/', 1)[-1]
+    patchset = output[1]
+    files = output[2:]
+
+    for f in files:
+      file_id, filename = f.split()
+      mode = 'M'
+
+      try:
+        content = run('show', '%s:%s' % (parent, filename))
+      except subprocess2.CalledProcessError:
+        # File didn't exist in the parent revision.
+        content = ''
+        mode = 'A'
+
+      content_type, payload = EncodeMultipartFormData([
+        ('checksum', md5.md5(content).hexdigest()),
+        ('filename', filename),
+        ('is_current', 'False'),
+        ('status', mode),
+      ], [
+        ('data', filename, content),
+      ])
+
+      # pylint: disable=W0212
+      print '  Uploading base file for %s:' % filename, rietveld._send(
+        '/%s/upload_content/%s/%s' % (issue, patchset, file_id),
+        payload=payload,
+        content_type=content_type,
+      )
+
+      try:
+        content = run('show', '%s:%s' % (commit, filename))
+      except subprocess2.CalledProcessError:
+        # File no longer exists in the new commit.
+        content = ''
+        mode = 'D'
+
+      content_type, payload = EncodeMultipartFormData([
+        ('checksum', md5.md5(content).hexdigest()),
+        ('filename', filename),
+        ('is_current', 'True'),
+        ('status', mode),
+      ], [
+        ('data', filename, content),
+      ])
+
+      # pylint: disable=W0212
+      print '  Uploading %s:' % filename, rietveld._send(
+        '/%s/upload_content/%s/%s' % (issue, patchset, file_id),
+        payload=payload,
+        content_type=content_type,
+      )
+
+    # pylint: disable=W0212
+    print 'Finalizing upload:', rietveld._send('/%s/upload_complete/1' % issue)
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      '--branch',
+      '-b',
+      help='The upstream branch to cherry pick to.',
+      metavar='<branch>',
+      required=True,
+  )
+  parser.add_argument(
+      'commit',
+      help='SHA to cherry pick.',
+      metavar='<commit>',
+  )
+  args = parser.parse_args()
+  cherry_pick(args.branch, args.commit)
+
+if __name__ == '__main__':
+  sys.exit(main())