.198 crash-looped 236x on a truncated OTA binary with a good backup
sitting in update-backup/ — verify_pending_update() can't help when
the new binary never runs. New scripts/ota-crash-guard.sh runs as
root from ExecStartPre: while the post-OTA pending-verify marker
exists it counts start attempts, and after 5 failures restores the
backup binary (atomic rename), replaces the marker with an
update-rolled-back.json tombstone, and lets the service come back
on the previous version.
Wiring: fresh ISOs get the ExecStartPre line in the unit file;
existing nodes get a drop-in installed by apply_update's runtime
component step on their next OTA. '+-' prefix so a missing or
failing guard can never block the service.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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