#!/usr/bin/env python3 # Copyright 2018 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. """Usage: run_with_dummy_home.py Helper for running a test with a dummy $HOME, populated with just enough for tests to run and pass. Useful for isolating tests from the real $HOME, which can contain config files that negatively affect test performance. """ import os import shutil import subprocess import sys import tempfile def _set_up_dummy_home(original_home, dummy_home): """Sets up a dummy $HOME that Chromium tests can run in. Files are copied, while directories are symlinked. """ for filename in ['.Xauthority']: original_path = os.path.join(original_home, filename) if not os.path.exists(original_path): continue shutil.copyfile(original_path, os.path.join(dummy_home, filename)) # Prevent fontconfig etc. from reconstructing the cache and symlink rr # trace directory. for dirpath in [['.cache'], ['.local', 'share', 'rr'], ['.vpython'], ['.vpython_cipd_cache'], ['.vpython-root']]: original_path = os.path.join(original_home, *dirpath) if not os.path.exists(original_path): continue dummy_parent_path = os.path.join(dummy_home, *dirpath[:-1]) if not os.path.isdir(dummy_parent_path): os.makedirs(dummy_parent_path) os.symlink(original_path, os.path.join(dummy_home, *dirpath)) def main(): try: dummy_home = tempfile.mkdtemp() print('Creating dummy home in %s' % dummy_home) original_home = os.environ['HOME'] os.environ['HOME'] = dummy_home _set_up_dummy_home(original_home, dummy_home) return subprocess.call(sys.argv[1:]) finally: shutil.rmtree(dummy_home) if __name__ == '__main__': sys.exit(main())