Fix gae.py's detection of current active credentials.

appengine/components/tools/gae.py

 #!/usr/bin/env python
 # Copyright 2014 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Wrapper around GAE SDK tools to simplify working with multi module apps."""
 
 __version__ = '1.2'
 
 import atexit
@@ skipping 54 matching lines @@
           app.app_dir, 'origin/master')
       logs, _ = log_since.get_logs(
           app.app_dir, pseudo_revision, mergebase, start, end)
       print('\nLogs between %s and %s:' % (from_version, to_version))
       print('%s\n' % logs)
 
 
 ##
 
 
+def CMDappcfg_login(parser, args):
+  """Sets up authentication for appcfg.py usage [DEPRECATED]."""
+  app, _, _ = parser.parse_args(args)
+  print (
+      'Since appcfg.py doesn\'t support explicit login command, we\'ll run '
+      'innocent "list_version" instead. It will trigger appcfg\'s login flow. '
+      '\n'
+      'It\'s fine if "list_version" call itself fails - at this point we have '
+      'the necessary credentials cached and other subcommands should be able '
+      'to use them.\n')
+  gae_sdk_utils.appcfg_login(app)
+  return 0
+
+
 def CMDactive(parser, args):
   """Prints the active versions on the server.
 
   This is an approximation of querying which version is the default.
   """
   parser.add_option(
       '-b', '--bare', action='store_true',
       help='Only print the version(s), nothing else')
   app, options, _modules = parser.parse_args(args)
   data = app.get_actives()
@@ skipping 421 matching lines @@
     print >> sys.stderr, str(e)
     return 1
   except KeyboardInterrupt:
     # Don't dump stack traces on Ctrl+C, it's expected flow in some commands.
     print >> sys.stderr, '\nInterrupted'
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))