fix dryrun, path check in 'fetch'

fetch.py

 #!/usr/bin/env python
 # Copyright (c) 2013 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 perform checkouts in one easy command line!
 
 Usage:
   fetch <recipe> [--property=value [--property2=value2 ...]]
@@ skipping 142 matching lines @@
   sys.exit(bool(msg))
 
 
 def handle_args(argv):
   """Gets the recipe name from the command line arguments."""
   if len(argv) <= 1:
     usage('Must specify a recipe.')
   if argv[1] in ('-h', '--help', 'help'):
     usage()
 
+  dryrun = False
   if argv[1] in ('-n', '--dry-run'):
     dryrun = True
     argv.pop(1)
 
   def looks_like_arg(arg):
     return arg.startswith('--') and arg.count('=') == 1
 
   bad_parms = [x for x in argv[2:] if not looks_like_arg(x)]
   if bad_parms:
     usage('Got bad arguments %s' % bad_parms)
 
   recipe = argv[1]
   props = argv[2:]
   return dryrun, recipe, props
 
 
 def run_recipe_fetch(recipe, props, aliased=False):
   """Invoke a recipe's fetch method with the passed-through args
   and return its json output as a python object."""
   recipe_path = os.path.abspath(os.path.join(SCRIPT_PATH, 'recipes', recipe))
-  if not os.path.exists(recipe_path):
+  if not os.path.exists(recipe_path + '.py'):
     print "Could not find a recipe for %s" % recipe
     sys.exit(1)
 
   cmd = [sys.executable, recipe_path + '.py', 'fetch'] + props
   result = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0]
 
   spec = json.loads(result)
   if 'alias' in spec:
     assert not aliased
     return run_recipe_fetch(
@@ skipping 29 matching lines @@
 
 
 def main():
   dryrun, recipe, props = handle_args(sys.argv)
   spec, root = run_recipe_fetch(recipe, props)
   return run(dryrun, spec, root)
 
 
 if __name__ == '__main__':
   sys.exit(main())