Garry Tan and Claude Fable 5
d4b0131636
fix(wtree): a failed touch falls through to the HEAD seed instead of reopening the racy window ( #2687 )
...
The v1.74 racy-git fix carries the real index's mtime onto the temp copy —
but its 'touch -r … || true' meant a FAILED touch silently kept the copy's
fresh stamp, marking every entry non-racy and reopening the exact same-size-
rewrite hole. A failed touch now discards the copy and seeds from read-tree
HEAD (slower; every entry re-hashed; fingerprint stays honest).
Verification for #2687 itself: the reporter's same-size-rewrite repro run 20
iterations against this tree — 0 misses (the underlying race was fixed by
v1.74's b1485d88 with its own regression test; this wave verifies and closes,
it does not claim that fix). Receipt: the stubbed-touch test fails on a
v1.77.0.0 scratch worktree.
Fixes #2687
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com >
2026-08-31 21:36:02 +00:00
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