| #!/usr/bin/env python3.8 |
| # Copyright 2020 The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| """Emulation of `rm -f out && cp -af` in out. This is necessary on Mac in order |
| to preserve nanoseconds of mtime. See https://fxbug.dev/56376#c5.""" |
| |
| import os |
| import shutil |
| import sys |
| |
| |
| def main(): |
| if len(sys.argv) != 3: |
| print('usage: copy.py source dest', file=sys.stderr) |
| return 1 |
| source = sys.argv[1] |
| dest = sys.argv[2] |
| |
| if os.path.isdir(source): |
| print( |
| f'{source} is a directory, tool "copy" does not support directory copies' |
| ) |
| return 1 |
| |
| if os.path.exists(dest): |
| if os.path.isdir(dest): |
| |
| def _on_error(fn, path, dummy_excinfo): |
| # The operation failed, possibly because the file is set to |
| # read-only. If that's why, make it writable and try the op |
| # again. |
| if not os.access(path, os.W_OK): |
| os.chmod(path, stat.S_IWRITE) |
| fn(path) |
| |
| shutil.rmtree(dest, onerror=_on_error) |
| else: |
| if not os.access(dest, os.W_OK): |
| # Attempt to make the file writable before deleting it. |
| os.chmod(dest, stat.S_IWRITE) |
| os.unlink(dest) |
| |
| shutil.copy2(source, dest) |
| |
| |
| if __name__ == '__main__': |
| main() |