Interrupted-Operation Recovery
Recover from interrupted installation or upgrade operations using state, lock, backup, and manifest evidence.
First classify the operation as not started, partially completed, completed, already current, blocked by another process, failed and retry-safe, or failed and requiring a restore decision. Preserve logs, lock state, manifest, backup evidence, migration status, and service state.
The rehearsal exercises interruption after backup and before service recreation, lock detection, resume, duplicate prevention, and volume preservation. It does not prove that every arbitrary step is independently reversible.
Verification
Confirm no live process owns the lock, compare actual state with the manifest, verify backup integrity, rerun only the source-supported idempotent step, and repeat full acceptance.