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#!/usr/bin/env python
import argparse
import hashlib
import pathlib
import sys
PARSER = argparse.ArgumentParser(
description="Helper for check file hashes in Makefile instead of bare timestamps"
)
PARSER.add_argument("dst", metavar="DST", type=pathlib.Path)
PARSER.add_argument("-d", "--debug", action="store_true", default=False)
def main(argv):
args = PARSER.parse_args(argv)
dst = args.dst
assert dst.suffix == ".hash"
dirname = dst.parent
if dirname.name != ".hash":
if args.debug:
print(f"Invalid name {dst} -> dirname {dirname}", file=sys.stderr)
return 0
dirname.mkdir(exist_ok=True)
src_dir = dirname.parent
src_name = dst.stem # drop .hash
full_src = src_dir / src_name
hasher = hashlib.sha256()
try:
hasher.update(full_src.read_bytes())
except OSError:
if args.debug:
print(f"Cannot open {full_src}", file=sys.stderr)
return 0
src_hash = hasher.hexdigest()
if dst.exists():
dst_hash = dst.read_text()
else:
dst_hash = ""
if src_hash != dst_hash:
dst.write_text(src_hash)
print(f"re-hash {src_hash}")
else:
if args.debug:
print(f"Skip {src_hash} checksum, up-to-date")
return 0
if __name__ == "__main__":
sys.exit(main(sys.argv[1:]))
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