Dropping useless comment. Using getuser which is more correct.

bin/cros_gsdcurl.py

 #!/usr/bin/python
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 import getpass
 import os
 import re
 import subprocess
 import sys
 import tempfile
 import urllib
 
 
 def Authenticate():
-  # Authenticate.
-  default_username = os.environ.get('LOGNAME', '')
+  default_username = getpass.getuser()
   username = os.environ.get('GSDCURL_USERNAME')
   if username is None:
     sys.stderr.write('Username [' + default_username + ']: ')
     username = raw_input()
   if username == '':
     username = default_username + '@google.com'
   elif '@' not in username:
     username = username + '@google.com'
   passwd = os.environ.get('GSDCURL_PASSWORD')
   if passwd is None:
@@ skipping 32 matching lines @@
     os.remove(cookies)
 
 
 def main(argv):
   auth = Authenticate()
   return DoCurl(auth, argv)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))