Add support to change the status header for gatekeeper-ng.

gatekeeper_mailer.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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.
 
 """Provides mailer templates for gatekeeper_ng.
 
 This module populates jinja mail templates to notify tree watchers when the
 tree is closed.
 """
 
 import jinja2
 import os
 import utils
 
 jinja_environment = jinja2.Environment(
     loader=jinja2.FileSystemLoader(
         os.path.join(os.path.dirname(__file__), 'templates')),
     autoescape=True)
 jinja_environment.filters['urlquote'] = utils.urlquote
 
 # From buildbot's results.py.
 SUCCESS, WARNINGS, FAILURE, SKIPPED, EXCEPTION, RETRY = range(6)
 Results = ["success", "warnings", "failure", "skipped", "exception", "retry"]
 
 
 class MailTemplate(object):
   """Encapsulates a buildbot status email."""
 
-  status_header = 'Automatically closing tree for "%(steps)s" on "%(builder)s"'
-  default_subject = ('buildbot %(result)s in %(projectName)s on %(builder)s, '
-                     'revision %(revision)s')
+  default_status_header = ('Automatically closing tree for "%(steps)s" on '
+                          '"%(builder_name)s"')
+  default_subject = ('buildbot %(result)s in %(project_name)s on '
+                     '%(builder_name)s, revision %(revision)s')
 
   def __init__(self, waterfall_url, build_url, project_name, fromaddr,
-               reply_to=None, subject=None):
+               reply_to=None, subject=None, status_header=None):
 
 
     self.reply_to = reply_to
     self.fromaddr = fromaddr
     self.subject = subject or self.default_subject
+    self.status_header = status_header or self.default_status_header
     self.waterfall_url = waterfall_url
     self.build_url = build_url
     self.project_name = project_name
 
   def genMessageContent(self, build_status):
     builder_name = build_status['builderName']
     us_steps = ','.join(build_status['unsatisfied'])
     revisions_list = build_status['revisions']
-    status_text = self.status_header % {
-        'builder': builder_name,
-        'steps': us_steps,
-    }
-
-    # Use the first line as a title.
-    status_title = status_text.split('\n', 1)[0]
     blame_list = ','.join(build_status['blamelist'])
     revisions_string = ''
     latest_revision = 0
     if revisions_list:
       revisions_string = ', '.join([str(rev) for rev in revisions_list])
       latest_revision = max([rev for rev in revisions_list])
     if build_status['result'] == FAILURE:
       result = 'failure'
     else:
       result = 'warning'
 
     context = {
-        'status_title': status_title,
-        'waterfall_url': self.waterfall_url,
-        'status': status_text.replace('\n', "<br>\n"),
-        'build_url': self.build_url,
-        'revisions': revisions_string,
         'blame_list': blame_list,
         'build_status': build_status,
+        'build_url': self.build_url,
         'builder_name': builder_name,
+        'revisions': revisions_string,
+        'steps': us_steps,
+        'waterfall_url': self.waterfall_url,
     }
 
+    status_text = self.status_header % context
+
+    # Use the first line as a title.
+    status_title = status_text.split('\n', 1)[0]
+
+    context['status'] = status_text.replace('\n', "<br>\n")
+    context['status_title'] = status_title
+
     html_content = jinja_environment.get_template('waterfall_mail.html').render(
         context)
 
     text_content = jinja_environment.get_template('mail_text.txt').render(
         context)
 
     subject = self.subject % {
         'result': result,
-        'projectName': self.project_name,
-        'builder': builder_name,
+        'project_name': self.project_name,
+        'builder_name': builder_name,
         'reason': build_status['reason'],
         'revision': str(latest_revision),
         'buildnumber': str(build_status['number']),
     }
 
     return text_content, html_content, subject