submit_try: Obtain the list of trybots from the checked-in slaves.cfg

tools/buildbot_globals.py

 #!/usr/bin/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 read access to buildbot's global_variables.json .
 """
 
 
 from contextlib import closing
 
 import HTMLParser
 import json
+import re
 import svn
 import sys
 import urllib2
 
 
 _global_vars = None
 
 
 GLOBAL_VARS_JSON_URL = ('https://skia.googlesource.com/buildbot/+'
                         '/master/site_config/global_variables.json')
@@ skipping 12 matching lines @@
   """
   pass
 
 
 class NoSuchGlobalVariable(KeyError):
   """Exception which is raised when a given variable is not found in the
   global_variables.json file."""
   pass
 
 
 def retrieve_from_googlesource(url):

[borenet, 2014/01/13 21:00:14]

This function could really go into a utility module, since it's not strictly
related to buildbot global variables.

   """Retrieve the given file from GoogleSource's HTTP interface, trimming the
   extraneous HTML. Intended to be a GoogleSource equivalent of "svn cat".
 
   This just returns the unescaped contents of the first <pre> tag which matches
   our expectations for GoogleSource's HTTP interface. If that interface changes,
   this function will almost surely break.
 
   Args:
       url: string; the URL of the file to retrieve.
   Returns:
       The contents of the file in GoogleSource, stripped of the extra HTML from
           the HTML interface.
   """
   with closing(urllib2.urlopen(url)) as f:
     contents = f.read()
-    pre_open = '<pre class="git-blob prettyprint linenums lang-json">'
+    pre_open = '<pre class="git-blob prettyprint linenums lang-(\w+)">'
     pre_close = '</pre>'
-    start_index = contents.find(pre_open)
+    matched_tag = re.search(pre_open, contents).group()
+    start_index = contents.find(matched_tag)
     end_index = contents.find(pre_close)
     parser = HTMLParser.HTMLParser()
-    return parser.unescape(contents[start_index + len(pre_open):end_index])
+    return parser.unescape(contents[start_index + len(matched_tag):end_index])
 
 
 def Get(var_name):
   """Return the value associated with this name in global_variables.json.
   
   Args:
       var_name: string; the variable to look up.
   Returns:
       The value of the variable.
   Raises:
@@ skipping 11 matching lines @@
     except ValueError as e:
       raise JsonDecodeError(e.message + '\n' + global_vars_text)
   try:
     return _global_vars[var_name]['value']
   except KeyError:
     raise NoSuchGlobalVariable(var_name)
 
 
 if __name__ == '__main__':
   print Get(sys.argv[1])