-parser = argparse.ArgumentParser()
-parser.add_argument("ROOT_HASH", help="root tree for the search")
-parser.add_argument("PATH_ITEM", help="path component", nargs='*')
-opts = parser.parse_args()
-tree_hash = opts.ROOT_HASH
-path = opts.PATH_ITEM
+from bup.compat import argv_bytes
+from bup.helpers import handle_ctrl_c, readpipe
+from bup.io import byte_stream
+from bup import options
+
+
+optspec = """
+subtree-hash ROOT_HASH [PATH_ITEM...]
+--
+"""
+
+handle_ctrl_c()
+
+o = options.Options(optspec)
+(opt, flags, extra) = o.parse(sys.argv[1:])
+
+if len(extra) < 1:
+ o.fatal('must specify a root hash')
+
+tree_hash = argv_bytes(extra[0])
+path = [argv_bytes(x) for x in extra[1:]]