[depot_tools] Find, upload and apply patchset dependencies

git_cl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld."""
 
 from distutils.version import LooseVersion
@@ skipping 2167 matching lines @@
         remote_url = (cl.GetRemoteUrl() + '@'
                       + cl.GetUpstreamBranch().split('/')[-1])
   if remote_url:
     upload_args.extend(['--base_url', remote_url])
     remote, remote_branch = cl.GetRemoteBranch()
     target_ref = GetTargetRef(remote, remote_branch, options.target_branch,
                               settings.GetPendingRefPrefix())
     if target_ref:
       upload_args.extend(['--target_ref', target_ref])
 
+    # Look for dependent patchsets. See crbug.com/480453 for more details.
+    remote, upstream_branch = cl.FetchUpstreamTuple(cl.GetBranch())
+    upstream_branch = ShortBranchName(upstream_branch)
+    if remote is '.':
+      # A local branch is being tracked.
+      local_branch = ShortBranchName(upstream_branch)
+      auth_config = auth.extract_auth_config_from_options(options)
+      branch_cl = Changelist(branchref=local_branch, auth_config=auth_config)
+      branch_cl_issue_url = branch_cl.GetIssueURL()
+      branch_cl_issue = branch_cl.GetIssue()
+      branch_cl_patchset = branch_cl.GetPatchset()
+      if branch_cl_issue_url and branch_cl_issue and branch_cl_patchset:
+        upload_args.extend(
+            ['--depends_on_patchset', '%s:%s' % (
+                 branch_cl_issue, branch_cl_patchset)])
+        print
+        print ('The current branch (%s) is tracking a local branch (%s) with '
+               'an open CL.') % (cl.GetBranch(), local_branch)
+        print 'Adding %s/#ps%s as a dependency patchset.' % (
+            branch_cl_issue_url, branch_cl_patchset)
+        print
+
   project = settings.GetProject()
   if project:
     upload_args.extend(['--project', project])
 
   if options.cq_dry_run:
     upload_args.extend(['--cq_dry_run'])
 
   try:
     upload_args = ['upload'] + upload_args + args
     logging.info('upload.RealMain(%s)', upload_args)
@@ skipping 1310 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   colorama.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)