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034a4f3b1e
Both fuzzy tests asserted only that the final file content matched, which a
full transfer that ignored --fuzzy would also satisfy -- so a broken fuzzy
basis selection would pass undetected. Drive rsync directly with --debug=FUZZY
and assert the generator reports the expected basis ("fuzzy basis selected
for <f>: <basis>", generator.c find_fuzzy): rsync2.c for fuzzy, and the
closest-named candidate archive-v1.tar for fuzzy-basis. fuzzy switches from
checkit() to a manual run plus verify_dirs() so the output can be captured.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
46 lines
1.9 KiB
Python
46 lines
1.9 KiB
Python
#!/usr/bin/env python3
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"""Coverage of --fuzzy basis selection scoring (util1.c fuzzy_distance).
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When the destination has no exact match for a source file, --fuzzy makes the
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generator score the same-directory candidates by name similarity (fuzzy_distance)
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and use the closest as the delta basis. Set this up at depth with several
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similar-named candidates so the scorer actually runs.
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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, make_data_file, makepath, rmtree, run_rsync, test_fail,
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)
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src = FROMDIR
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deepdir = os.path.join('d1', 'd2')
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newfile = os.path.join(deepdir, 'archive-v2.tar')
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rmtree(src)
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rmtree(TODIR)
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makepath(src / deepdir, TODIR / deepdir)
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make_data_file(src / newfile, 300_000)
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base = (src / newfile).read_bytes()
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# Destination has NO 'archive-v2.tar', but several similar-named candidates that
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# are mostly identical to it -- so fuzzy must score them by name distance.
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(TODIR / deepdir / 'archive-v1.tar').write_bytes(base[:280_000] + b'older tail data')
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(TODIR / deepdir / 'archive-old.tar').write_bytes(base[:200_000])
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(TODIR / deepdir / 'unrelated.dat').write_bytes(b'nothing alike' * 1000)
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# Capture --debug=FUZZY: a correct final file alone would also result from a
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# full transfer that ignored --fuzzy, so assert the scorer actually chose the
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# closest-named candidate (archive-v1.tar) as the basis, not just that bytes match.
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proc = run_rsync('-a', '--fuzzy', '--no-whole-file', '--debug=FUZZY',
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f'{src}/', f'{TODIR}/', capture_output=True)
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want = f'fuzzy basis selected for {newfile}: {os.path.join(deepdir, "archive-v1.tar")}'
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if want not in proc.stdout:
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test_fail(f"--fuzzy did not score archive-v1.tar as the closest basis; "
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f"expected {want!r}, --debug=FUZZY output was:\n{proc.stdout}")
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assert_same(TODIR / newfile, src / newfile, label='fuzzy result')
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print("fuzzy-basis: --fuzzy candidate scoring (fuzzy_distance) verified at depth")
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