The degraded directory publication claimed the destination with mkdir, then
— on platforms whose rename refuses to replace a directory (macOS refuses
even an empty target, verified empirically) — removed the claim and retried
a plain rename. Between the unlink and the retry a foreign directory could
appear at the destination and be silently overwritten, breaking the
no-replace contract the fallback exists to provide.
Hold the claim for the whole transaction instead: rename over the claim
where the platform permits it (Linux), otherwise move the source children
into the claim one by one. The destination is never unlinked, so a
concurrent creator can only ever lose the mkdir race; every child rename
targets a nonexistent path inside the empty claim, and a failed move
restores the children and removes only the claim.
The child move legitimately changes the publication's identity, which the
confirmation now handles: a rename that consumed the staged path is still
proven by identity, while a child move is proven by the pre-rename content
fingerprint. The emptied source shell doubles as the signal distinguishing
the two shapes; moveSkillPathRecoverably removes it to keep move semantics.
玉澜
93703113cb