Using the root codereview.settings seems to be a problem for NACL...

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 134 matching lines @@
     self.checkout_root = scm.SVN.GetCheckoutRoot(self.checkout_root)
     if not self.options.email:
       # Assumes the svn credential is an email address.
       self.options.email = scm.SVN.GetEmail(self.checkout_root)
     logging.info("SVN(%s)" % self.checkout_root)
 
   def ReadRootFile(self, filename):
     try:
       # Try to search on the subversion repository for the file.
       import gcl
-      data = gcl.GetCachedFile(filename, use_root=True)
+      data = gcl.GetCachedFile(filename)
       logging.debug('%s:\n%s' % (filename, data))
       return data
     except ImportError:
       try:
         data = gclient_utils.FileRead(os.path.join(self.checkout_root,
                                                    filename))
         logging.debug('%s:\n%s' % (filename, data))
         return data
       except (IOError, OSError):
         logging.debug('%s:\nNone' % filename)
@@ skipping 445 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))