| """Filesystem locking helpers for generated output artifacts. | |
| Outputs under `output/` are sealed read-only (file 0o444, parent dir 0o555) | |
| to prevent accidental in-place mutation. The pipeline briefly relaxes those | |
| bits to rewrite, then reseals. | |
| """ | |
| from pathlib import Path | |
| FILE_WRITABLE = 0o644 | |
| FILE_SEALED = 0o444 | |
| DIR_WRITABLE = 0o755 | |
| DIR_SEALED = 0o555 | |
| def unlock_for_write(path: Path) -> None: | |
| path = Path(path) | |
| parent = path.parent | |
| if parent.exists(): | |
| parent.chmod(DIR_WRITABLE) | |
| if path.exists(): | |
| path.chmod(FILE_WRITABLE) | |
| def seal_output(path: Path) -> None: | |
| path = Path(path) | |
| if path.exists(): | |
| path.chmod(FILE_SEALED) | |
| parent = path.parent | |
| if parent.exists(): | |
| parent.chmod(DIR_SEALED) | |