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cairn-internandcairn-intern a3852bac59 fix(update): keep Windows failed-restore state in trusted recovery records (#979)
* fix(update): keep Windows failed-restore state in trusted recovery records

A failed restore currently records the last verified binary only as a
.deletable .keep marker in the install directory. Write an unresolved
identity-bound record to the existing per-user update-recovery store on
that failure path too, and consult it during preflight so deleting the
marker cannot silence the tamper refusal.

Fixes #868

* fix(update): keep a fail-closed signal if unresolved recovery records cannot be written

Ignoring a failed appendUnresolvedRecoveryRecord left only the sibling
.keep marker. An install-directory writer can delete that marker, after
which preflight finds no unresolved state and a retry can overwrite the
last verified recovery copy. Relocate that copy to a .recovery name when
the per-user record cannot be persisted so promotion still refuses.

Fixes #868

* fix(update): do not relocate the live binary when failed-restore compensation cannot record

persistFailedRestoreSignal relocated through the handle when the per-user
unresolved record could not be written, without checking that the object
was still the aside copy. A restore that had already put the verified
bytes back at targetPath then had that binary moved out of the executable
path. Verify identity with verifyPromotedTarget before relocating.

Unreadable recovery-state JSON now fails closed instead of looking like
an empty queue. The per-user vs per-machine split is documented: a second
account still relies on the install-directory .keep marker.

Fixes #868

* fix(update): durably commit recovery state on Windows

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Co-authored-by: cairn-intern <[email protected]>
2026-09-12 08:29:11 +08:00
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