Some weirdo folks have @ in their USER environment variable. Strip it off.

trychange.py

 #!/usr/bin/python
 # Copyright (c) 2009 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.
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
 import datetime
@@ skipping 584 matching lines @@
   if not swallow_exception:
     if options.verbose == 0:
       logging.basicConfig(level=logging.WARNING)
     elif options.verbose == 1:
       logging.basicConfig(level=logging.INFO)
     elif options.verbose > 1:
       logging.basicConfig(level=logging.DEBUG)
 
   logging.debug(argv)
 
+  # Strip off any @ in the user, otherwise svn gets confused.
+  options.user = options.user.split('@', 1)[0]
+
   if options.rietveld_url:
     # Try to extract the review number if possible and fix the protocol.
     if not '://' in options.rietveld_url:
       options.rietveld_url = 'http://' + options.rietveld_url
     match = re.match(r'^(.*)/(\d+)$', options.rietveld_url)
     if match:
       if options.issue or options.patchset:
         parser.error('Cannot use both --issue and use a review number url')
       options.issue = int(match.group(2))
       options.rietveld_url = match.group(1)
@@ skipping 106 matching lines @@
   except (InvalidScript, NoTryServerAccess), e:
     if swallow_exception:
       return 1
     print e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(TryChange(None, [], False))