Make recipes.py run give better messages.

recipes.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """Tool to interact with recipe repositories.
 
 This tool operates on the nearest ancestor directory containing an
 infra/config/recipes.cfg.
 """
 
 import argparse
+import ast
 import json
 import logging
 import os
 import subprocess
 import sys
 
 ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, os.path.join(ROOT_DIR, 'recipe_engine', 'third_party'))
 sys.path.insert(0, ROOT_DIR)
 
@@ skipping 89 matching lines @@
     properties = get_properties_from_file(args.properties_file)
   else:
     properties = arg_properties
 
   properties['recipe'] = args.recipe
 
   os.environ['PYTHONUNBUFFERED'] = '1'
   os.environ['PYTHONIOENCODING'] = 'UTF-8'
 
   _, config_file = get_package_config(args)
-  universe = loader.UniverseView(
+  universe_view = loader.UniverseView(
       loader.RecipeUniverse(
           package_deps, config_file), package_deps.root_package)
 
   workdir = (args.workdir or
       os.path.join(os.path.dirname(os.path.realpath(__file__)), 'workdir'))
   logging.info('Using %s as work directory' % workdir)
   if not os.path.exists(workdir):
     os.makedirs(workdir)
 
   if args.local_run:
     stream_engine = stream.LocalRunStreamEngine(sys.stdout)
   else:
     stream_engine = stream.AnnotatorStreamEngine(sys.stdout)
 
   old_cwd = os.getcwd()
   os.chdir(workdir)
   stream_engine = stream.ProductStreamEngine(
       stream.StreamEngineInvariants(), stream_engine)
 
   try:
     ret = recipe_run.run_steps(
         properties, stream_engine,
         step_runner.SubprocessStepRunner(stream_engine),
-        universe=universe)
+        universe_view=universe_view)
 
   finally:
     os.chdir(old_cwd)
 
   if args.local_run:
     print 'Finished recipe execution. Return value was %s' % ret
   return handle_recipe_return(ret, args.output_result_json, stream_engine)
 
 
 def roll(args):
@@ skipping 262 matching lines @@
 
     Warmly,
     recipes.py
     """
     return 1
 
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())