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61 lines
2.2 KiB
Python
61 lines
2.2 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""Snapshot prek installation metadata used to detect cache repairs."""
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from __future__ import annotations
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import base64
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import json
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import sys
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from pathlib import Path
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MARKERS = (("hooks", ".prek-hook.json"), ("repos", ".prek-repo.json"))
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def snapshot_markers(cache_dir: Path) -> dict[str, str]:
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"""Return shallow marker paths and their byte-for-byte contents."""
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snapshot = {}
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for directory, marker_name in MARKERS:
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parent = cache_dir / directory
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try:
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entries = sorted(parent.iterdir())
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except FileNotFoundError:
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continue
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for entry in entries:
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marker = entry / marker_name
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try:
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contents = marker.read_bytes()
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except FileNotFoundError:
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continue
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relative_path = marker.relative_to(cache_dir).as_posix()
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snapshot[relative_path] = base64.b64encode(contents).decode()
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return snapshot
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def main() -> None:
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cache_dir, output_file = map(Path, sys.argv[1:])
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snapshot = snapshot_markers(cache_dir)
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# Marker names are prek internals; an unrecognised layout must not look unchanged.
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if not snapshot and cache_dir.is_dir() and any(cache_dir.iterdir()):
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sys.exit("Populated prek cache contains no recognised installation markers")
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Path(output_file).write_text(json.dumps(snapshot, sort_keys=True))
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if __name__ == "__main__":
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main()
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