Fetch Gerrit cl description from gitiles.

R=andybons@chromium.org,scottmg@chromium.org
BUG=603207,605563

Review URL: https://codereview.chromium.org/1916123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300161 0039d316-1c4b-4281-b951-d872f2087c98

gerrit_util.py

@@ -483,6 +483,17 @@ def GetChangeDetail(host, change, o_params=None):
   return ReadHttpJsonResponse(CreateHttpConn(host, path))
 
 
+def GetChangeDescriptionFromGitiles(url, revision):
+  """Query Gitiles for actual commit message for a given url and ref.
+
+  url must be obtained from call to GetChangeDetail for a specific
+  revision (patchset) under 'fetch' key.
+  """
+  parsed = urlparse.urlparse(url)
+  path = '%s/+/%s?format=json' % (parsed.path, revision)
+  return ReadHttpJsonResponse(CreateHttpConn(parsed.netloc, path))['message']
+
+
 def GetChangeCurrentRevision(host, change):
   """Get information about the latest revision for a given change."""
   return QueryChanges(host, {}, change, o_params=('CURRENT_REVISION',))

git_cl.py

@@ -2161,8 +2161,10 @@ class _GerritChangelistImpl(_ChangelistCodereviewBase):
     return data['revisions'][data['current_revision']]['_number']
 
   def FetchDescription(self):
-    data = self._GetChangeDetail(['COMMIT_FOOTERS', 'CURRENT_REVISION'])
-    return data['revisions'][data['current_revision']]['commit_with_footers']
+    data = self._GetChangeDetail(['CURRENT_REVISION'])
+    current_rev = data['current_revision']
+    url = data['revisions'][current_rev]['fetch']['http']['url']
+    return gerrit_util.GetChangeDescriptionFromGitiles(url, current_rev)
 
   def UpdateDescriptionRemote(self, description):
     # TODO(tandrii)