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fix(up): never leave Windows without 8sync.exe - #103
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One update at a time (lock), skip when the release is already in place, restore the old binary by rename or copy when the swap fails, heal a missing binary from the newest moved-aside copy, and never sweep those copies while it is missing. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Seen live 2026-10-18:
8sync.exegone; only.8sync.old.51892(0.100.9) and.8sync.new.50188(a day old) left. The fail-closed guard hook then blocked every Claude Code session until the owner copied the backup back. Likely cause (not fully proven): rooms on older images auto-update concurrently on the same file..8sync.update.lock, create_new; >10 min = stale, taken over).8sync.exealready has the release's sha256.swap_in: tmp → dst failure → rename old back, else copy it back (never an empty slot); injected rename/copy so the failure paths are tested on every OS.heal_missing: dst missing → copy the newest.8sync.old.*into place; the sweep never runs while dst is missing;.8sync.new.*older than a day is swept.Tests: selfup 13 passed (new: failed swap restores by rename and by copy, heal from newest backup + sweep only when present, lock refusal/release); cargo verbs:: 537 passed. Gates: /sec OK, /rules ALLOWED, /aup-audit PASS, ccc risk --release medium.
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