Windows coverage gate only runs TestCrossPlatformCoverage*, and the
xattr mark helpers are Unix-only. Inject seams so marked dest is
retracted on owned drift, left in place when the mark is gone, and
the helper error paths are exercised on every platform.
Linux overlayfs recycles device+inode, so SameFile and a lone inode
token treated a replacement as owned and retracted it. Stamp staged
inodes with an xattr mark, prove Linux/Darwin identity with birth
time, and make shell copied-set rollback check dest first with inode
plus child names.
Match the Go dest-first identity check so a concurrent replacement is
never moved into .rollback-*; only a post-quarantine mismatch is
restored with no-replace. Cover both races in the npm smoke suite.
Record dest on occupy and retract it when confirmation, verify, or
staging cleanup fails. Restore unmatched quarantine with a no-replace
publish. Event/devapp copy uses mkdir-claim; shell rollback claims dest
before delete. Release copy now says npm/PowerShell create junctions and
Go uses os.Symlink, with copy fallback when linking is unavailable.
Cross-filesystem Skill moves now record publication identity as soon
as the staging path is renamed onto dest. A later mode-restore, copy
verification, or staging-cleanup failure retracts that proven dest so
retries are not blocked by an untracked leftover. A failed retract
reports an uncertain state naming both retained locations.
The shell mono/multi set publishers staged each Skill directory and
published it with a plain mv after the backup; anything another process
created at the destination between the backup and the move was silently
replaced, and restore_multi_skill_set then blind-deleted manifest paths,
so a concurrently replaced object could also be destroyed during
rollback. Publish through an atomic mkdir claim instead — EEXIST refuses
any occupant, staged children move into the claim one by one, and a
failed child move relocates them and removes only the claim. The
published manifest now records <dest>:<inode>, and rollback deletes a
destination only when its inode still matches the publication, skipping
concurrently replaced paths with a warning. Also fixes a latent
unbound-variable expansion where a shell variable was followed directly
by a full-width parenthesis in a message. Regression tests publish a
first Skill, replace it with a foreign directory, fail the second
publication, and assert rollback retains the foreign object untouched
while restoring the rest from backups.
玉澜