| """A staging directory that removes itself. | |
| `load_calibration` wants a directory holding `calibration/`, so scripts that | |
| have a bare epoch directory copy it into a temporary one first. Twenty-three | |
| call sites did `tempfile.mkdtemp()`; none removed it. On the author's machine | |
| that left 1,296 orphaned directories, and with the clean-room rebuild staging | |
| 273 MB of episodes per run it filled a 469 GB disk -- after which unrelated | |
| commands failed on ENOSPC with nothing pointing at the cause. | |
| These scripts are published. A reader who runs them fills their disk too. | |
| atexit rather than a context manager because most call sites hold the path for | |
| the whole run and wrapping each in a `with` would reindent the body of every | |
| main() -- a large diff for a small fix, and large diffs are where the real | |
| mistakes hide. | |
| """ | |
| from __future__ import annotations | |
| import atexit | |
| import shutil | |
| import tempfile | |
| from pathlib import Path | |
| _MADE: list[Path] = [] | |
| def _sweep() -> None: | |
| for d in _MADE: | |
| shutil.rmtree(d, ignore_errors=True) | |
| atexit.register(_sweep) | |
| def staging_dir(prefix: str = "react-stage-") -> Path: | |
| """A fresh temporary directory, deleted when the process exits.""" | |
| d = Path(tempfile.mkdtemp(prefix=prefix)) | |
| _MADE.append(d) | |
| return d | |