23 lines
654 B
Python
23 lines
654 B
Python
"""Atomic file writes: first a .tmp in the same directory, then os.replace.
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A crash leaves at most a .tmp file behind — never a half-written target
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file. The .tmp is overwritten on the next successful write.
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"""
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import json
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import os
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from pathlib import Path
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def atomic_write_text(path: Path, text: str) -> None:
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tmp = path.with_name(path.name + ".tmp")
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with open(tmp, "w", encoding="utf-8") as f:
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f.write(text)
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f.flush()
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os.fsync(f.fileno())
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os.replace(tmp, path)
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def atomic_write_json(path: Path, obj, **dumps_kwargs) -> None:
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atomic_write_text(path, json.dumps(obj, ensure_ascii=False, **dumps_kwargs))
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