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60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
#!/usr/bin/env python3
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"""Coverage of -S (--sparse) at depth.
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A file with a large hole, several directory levels deep, should arrive sparse
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(its allocated blocks much smaller than its apparent size) and byte-identical
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when copied with -S.
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We do NOT assert the converse (that a plain copy fills the hole): whether a
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zero-run is stored as a hole when -S is absent is the filesystem's choice, not
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rsync's -- ZFS/APFS transparently sparsify zero blocks, so a --no-sparse copy
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can legitimately stay sparse there.
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"""
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import os
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from rsyncfns import (
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FROMDIR, TODIR,
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assert_same, makepath, rmtree, run_rsync, test_fail, test_skipped,
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)
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src = FROMDIR
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deep = os.path.join('d1', 'd2', 'd3', 'holey')
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SIZE = 4 * 1024 * 1024
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def make_sparse(path):
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with open(path, 'wb') as f:
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f.write(b'head')
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f.seek(SIZE - 4)
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f.write(b'tail')
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def allocated(path):
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return os.stat(path).st_blocks * 512
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rmtree(src)
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rmtree(TODIR)
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makepath(src / 'd1' / 'd2' / 'd3')
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make_sparse(src / deep)
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# Confirm the source filesystem actually made a sparse file; otherwise the
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# whole premise (and any dest comparison) is meaningless here.
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if allocated(src / deep) >= SIZE:
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test_skipped("source filesystem did not create a sparse file", capability='sparse')
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# --- with -S the hole is preserved at the destination -----------------------
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run_rsync('-a', '-S', f'{src}/', f'{TODIR}/')
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assert_same(TODIR / deep, src / deep, label='-S content')
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if allocated(TODIR / deep) >= SIZE:
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test_fail(f"-S did not preserve the hole at depth "
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f"(allocated {allocated(TODIR / deep)} for a {SIZE}-byte file)")
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# --- a plain copy reproduces the content too (allocation is FS-defined) ------
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rmtree(TODIR)
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run_rsync('-a', '--no-sparse', f'{src}/', f'{TODIR}/')
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assert_same(TODIR / deep, src / deep, label='no-sparse content')
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print("sparse: -S preserves a deep hole; content correct with and without it")
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