Add script to apply a patch from rietveld.

At the moment it just fetches the patch. It's still useful to debug rietveld
issues.

Improve resiliency to invalid patches.

R=dpranke@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/6825085

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@81305 0039d316-1c4b-4281-b951-d872f2087c98

apply_issue.py

+#!/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.
+
+"""Applies an issue from Rietveld.
+"""
+
+import logging
+import optparse
+import sys
+
+import breakpad  # pylint: disable=W0611
+import fix_encoding
+import rietveld
+
+
+def main():
+  parser = optparse.OptionParser(description=sys.modules[__name__].__doc__)
+  parser.add_option(
+      '-v', '--verbose', action='count', help='Prints debugging infos')
+  parser.add_option(
+      '-i', '--issue', type='int', help='Rietveld issue number')
+  parser.add_option(
+      '-p', '--patchset', type='int', help='Rietveld issue\'s patchset number')
+  parser.add_option(
+      '-r',
+      '--root_dir',
+      action='store',
+      help='Root directory to apply the patch')
+  parser.add_option(
+      '-s',
+      '--server',
+      action='store',
+      default='http://codereview.chromium.org',
+      help='Rietveld server')
+  options, args = parser.parse_args()
+  LOG_FORMAT = '%(levelname)s %(filename)s(%(lineno)d): %(message)s'
+  if not options.verbose:
+    logging.basicConfig(level=logging.WARNING, format=LOG_FORMAT)
+  elif options.verbose == 1:
+    logging.basicConfig(level=logging.INFO, format=LOG_FORMAT)
+  elif options.verbose > 1:
+    logging.basicConfig(level=logging.DEBUG, format=LOG_FORMAT)
+  if args:
+    parser.error('Extra argument(s) "%s" not understood' % ' '.join(args))
+  if not options.issue:
+    parser.error('Require --issue')
+
+  obj = rietveld.Rietveld(options.server, None, None)
+
+  if not options.patchset:
+    options.patchset = obj.get_issue_properties(
+        options.issue, False)['patchsets'][-1]
+    logging.info('Using patchset %d' % options.patchset)
+  obj.get_patch(options.issue, options.patchset)
+  return 0
+
+
+if __name__ == "__main__":
+  fix_encoding.fix_encoding()
+  sys.exit(main())

patch.py

@@ -89,6 +89,8 @@ class FilePatchDiff(FilePatchBase):
 
   def __init__(self, filename, diff, svn_properties):
     super(FilePatchDiff, self).__init__(filename)
+    if not diff:
+      self._fail('File doesn\'t have a diff.')
     self.diff_header, self.diff_hunks = self._split_header(diff)
     self.svn_properties = svn_properties or []
     self.is_git_diff = self._is_git_diff_header(self.diff_header)

rietveld.py

@@ -112,10 +112,11 @@ class Rietveld(object):
     props = self.get_patchset_properties(issue, patchset) or {}
     out = []
     for filename, state in props.get('files', {}).iteritems():
+      logging.debug('%s' % filename)
       status = state.get('status')
       if status is None:
         raise patch.UnsupportedPatchFormat(
-            filename, 'File\'s status is None, patchset upload is incomplete')
+            filename, 'File\'s status is None, patchset upload is incomplete.')
 
       # TODO(maruel): That's bad, it confuses property change.
       status = status.strip()
@@ -137,7 +138,8 @@ class Rietveld(object):
           if state['num_chunks']:
             diff = self.get_file_diff(issue, patchset, state['id'])
           else:
-            diff = None
+            raise patch.UnsupportedPatchFormat(
+                filename, 'File doesn\'t have a diff.')
           out.append(patch.FilePatchDiff(filename, diff, props))
       else:
         # Line too long (N/80)
@@ -188,6 +190,7 @@ class Rietveld(object):
     maxtries = 5
     for retry in xrange(maxtries):
       try:
+        logging.debug('%s' % request_path)
         result = self.rpc_server.Send(request_path, **kwargs)
         # Sometimes GAE returns a HTTP 200 but with HTTP 500 as the content. How
         # nice.

tests/patch_test.py

@@ -192,6 +192,20 @@ class PatchTest(unittest.TestCase):
     except patch.UnsupportedPatchFormat:
       pass
 
+  def testFilePatchNoDiff(self):
+    try:
+      patch.FilePatchDiff('foo', '', [])
+      self.fail()
+    except patch.UnsupportedPatchFormat:
+      pass
+
+  def testFilePatchNoneDiff(self):
+    try:
+      patch.FilePatchDiff('foo', None, [])
+      self.fail()
+    except patch.UnsupportedPatchFormat:
+      pass
+
   def testFilePatchBadDiffName(self):
     try:
       patch.FilePatchDiff('foo', SVN_PATCH, [])