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#!/usr/bin/env python
# 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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