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- #!/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 <command>
- 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())
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