Added web spider capability for listing versions.

bin/spack

@@ -30,6 +30,8 @@ parser.add_argument('-v', '--verbose', action='store_true', dest='verbose',
                     help="print additional output during builds")
 parser.add_argument('-d', '--debug', action='store_true', dest='debug',
                     help="write out debug logs during compile")
+parser.add_argument('-m', '--mock', action='store_true', dest='mock',
+                    help="Use mock packages instead of real ones.")
 
 # each command module implements a parser() function, to which we pass its
 # subparser for setup.
@@ -46,6 +48,10 @@ args = parser.parse_args()
 # Set up environment based on args.
 spack.verbose = args.verbose
 spack.debug = args.debug
+if args.mock:
+    from spack.util.filesystem import new_path
+    mock_path = new_path(spack.module_path, 'test', 'mock_packages')
+    spack.packages_path = mock_path
 
 # Try to load the particular command asked for and run it
 command = spack.cmd.get_command(args.command)