upload.py has a raw_input() that keeps on throwing crap, try to trap it as much as possible.

gcl.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """\
 Wrapper script around Rietveld's upload.py that simplifies working with groups
 of files.
 """
 
@@ skipping 888 matching lines @@
 
   # Change the current working directory before calling upload.py so that it
   # shows the correct base.
   previous_cwd = os.getcwd()
   os.chdir(change_info.GetLocalRoot())
   # If we have a lot of files with long paths, then we won't be able to fit
   # the command to "svn diff".  Instead, we generate the diff manually for
   # each file and concatenate them before passing it to upload.py.
   if change_info.patch is None:
     change_info.patch = GenerateDiff(change_info.GetFileNames())
-  issue, patchset = upload.RealMain(upload_arg, change_info.patch)
+  try:
+    issue, patchset = upload.RealMain(upload_arg, change_info.patch)
+  except KeyboardInterrupt:
+    sys.exit(1)
   if issue and patchset:
     change_info.issue = int(issue)
     change_info.patchset = int(patchset)
     change_info.Save()
 
   if desc_file:
     os.remove(desc_file)
   change_info.PrimeLint()
   os.chdir(previous_cwd)
   print "*** Upload does not submit a try; use gcl try to submit a try. ***"
@@ skipping 529 matching lines @@
       raise
     print >> sys.stderr, (
         'AppEngine is misbehaving and returned HTTP %d, again. Keep faith '
         'and retry or visit go/isgaeup.\n%s') % (e.code, str(e))
     return 1
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   sys.exit(main(sys.argv[1:]))