Rietveld: don't email on "Dry Run: CQ is trying da patch"

appengine/chromium_rietveld/codereview/utils.py

 # Copyright 2011 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 78 matching lines @@
 
   Args:
     text: a string.
 
   Returns:
     A string with all line breaks converted to LF.
   """
   return text.replace('\r\n', '\n').replace('\r', '\n')
 
 
-_CQ_STATUS_REGEX = re.compile(
-    '(dry run: )?CQ is trying da patch. Follow status at\s+'
-    '(https://.+/patch-status/(.+/)?(\d+)/(\d+))\s*', re.I)
+_CQ_STATUS_URL_REGEX = re.compile(
+    '^(dry run: )?CQ is trying da patch.\s+Follow status at\s+'
+    '(https://.+/patch-status/(.+/)?(\d+)/(\d+))', re.I)
+
+# This is different from above, because status url is not configured for all
+# CQs, in which case CQ posts something like:
+#   CQ is trying da patch.
+#   Reference: codereview/xxxx/yyy
+_CQ_DRY_RUN_START_REGEX = re.compile(
+    '^dry run: CQ is trying da patch.\s+'
+    '(Follow status at|Reference:)', re.I)
+
+_CQ_DRY_RUN_MESSAGE = re.compile('^dry run', re.I)
 
 
 def parse_cq_status_url_message(msg):
   """Returns url, issue, patchset parsed from CQ status message.
 
   If parsing failed, returns None, None, None.
   """
   # Example of message, Dry Run prefix is optional.
   # Dry run: CQ is trying da patch. Follow status at
   # https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.org/2131593002/1
-  match = _CQ_STATUS_REGEX.match(msg)
+  match = _CQ_STATUS_URL_REGEX.match(msg)
   if not match:
     return None, None, None
   _, url, _, issue, patchset = match.groups()
   return url, int(issue), int(patchset)
+
+
+def is_cq_dry_run_start_message(msg):
+  return bool(_CQ_DRY_RUN_START_REGEX.match(msg))
+
+
+def is_cq_dry_message(msg):
+  return bool(_CQ_DRY_RUN_MESSAGE.match(msg))