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eec13dad68
layer construction involves rsync, and that process ignores times to avoid some of the layers being larger than they would otherwise where the only difference is times. This saves a small amount of space, around 14MiB, but results in files in the layers having non-intended time values. Ensure mtime and atime in the source chroot match what is found in the destination chroot.
39 lines
1.1 KiB
Python
Executable File
39 lines
1.1 KiB
Python
Executable File
#!/usr/bin/python3
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# usage: sync-mtime src dst
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#
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# synchronize atime/mtime on files between src and dst.
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#
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# src and dst are directories, where dst is expected to contain a subset of the
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# files found in src. for each file present in dst or a subdirectory thereof,
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# if atime/mtime differ between the same file in src and that file in dst,
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# update atime/mtime on the file in dst.
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import os
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import sys
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from pathlib import Path
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def time_eq(a: os.stat_result, b: os.stat_result) -> bool:
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return (
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(a.st_mtime_ns == b.st_mtime_ns) and
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(a.st_atime_ns == b.st_atime_ns)
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)
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src, dst = sys.argv[1:]
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for dirpath, dirnames, filenames in Path(dst).walk():
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for filename in filenames:
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dst_file = dirpath / filename
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if not dst_file.is_file():
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continue
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src_file = src / dst_file.relative_to(dst)
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src_stat = src_file.stat(follow_symlinks=False)
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dst_stat = dst_file.stat(follow_symlinks=False)
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if time_eq(src_stat, dst_stat):
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continue
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ns = (src_stat.st_atime_ns, src_stat.st_mtime_ns)
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os.utime(dst_file, ns=ns, follow_symlinks=False)
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