The Tor Browser / file revision

 #!/usr/bin/env python

 # This Source Code Form is subject to the terms of the Mozilla Public

 # License, v. 2.0. If a copy of the MPL was not distributed with this file,

 # You can obtain one at http://mozilla.org/MPL/2.0/.

 from __future__ import unicode_literals

 import subprocess

 repo = "https://github.com/w3c/testharness.js"

 dest = "resources-upstream"

 files = [{"f":"testharness.js"},

          {"f":"testharness.css"},

          {"f":"idlharness.js"},

          {"d":"webidl2/lib/webidl2.js", "f":"WebIDLParser.js"}]

 subprocess.check_call(["git", "clone", repo, dest])

 subprocess.check_call(["git", "submodule", "init"], cwd=dest)

 subprocess.check_call(["git", "submodule", "update"], cwd=dest)

 for f in files:

     path = f["d"] if "d" in f else f["f"]

     subprocess.check_call(["cp", "%s/%s" % (dest, path), f["f"]])

     subprocess.check_call(["hg", "add", f["f"]])

 subprocess.check_call(["rm", "-rf", dest])