Sub-cause: on guest pct reboot, in-guest dockerd auto-starts unless-stopped
drive-backed apps ~18s BEFORE the agent re-binds the drive; the create-time
volume bind fails (mkdir /mnt/felhom-drives/<drive>/userdata: permission denied)
and RestartCount=0 means it's never retried -> stuck Exited. The existing
recovery (processGuestBootChange) RAN but raced the rebind: it sampled the
agent's BoundUnderParent once during fast startup (not live yet), recreated
nothing, and persisted the new boot-id -> burned its one-shot. The periodic gate
never recovered them either (first observation after the rebind -> no transition).
Fix (harden the existing mechanism, no parallel one): processGuestBootChange now
gates on the REAL live in-guest bind. driveBindLive checks whether
/mnt/felhom-drives/<drive> is an actual mountpoint in the controller's own /mnt
(rslave) /proc/self/mountinfo -- true only once the agent's bind propagated,
exactly when docker can recreate the app. pollLiveBinds waits for that (bounded
~120s, poll 2s; rebind lands ~18s) and only then recreates via the normal
pipeline, including stuck-Exited create-time-failure apps (shouldRecreateOnBoot
is state-independent). Single-flight; absent-after-window drives left to the gate;
host-reboot path unaffected; guest-only reboot path now covered.
Tests: pollLiveBinds waits through the rebind then reports live (recreate fires);
never-live drive stays absent; pre-fix companion (single early sample misses the
not-yet-live bind). Red-proofed against a no-wait single-sample.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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