felhom.eu/documentation/audits/storage-lifecycle-acceptance-2026-06-15.md

Storage lifecycle completion + acceptance sweep (intermediary-mount) — 2026-06-15

Scope: finish the storage lifecycle on the intermediary-mount foundation (Phase A), migrate the second drive + confirm rslave (Phase B), and run a full edge-case acceptance sweep including a real host reboot (Phase C). Unattended, live on guest 9201 / felhom-pve. Trunk-based, per-commit green gate, non-hollow tests with pre-fix companions.

Deployed at close: agent v0.36.7 (felhom-agent@1e20584), controller v0.68.1 (felhom-controller@7a85732), catalog app-catalog-felhom.eu@939864f. Both external drives on the new model, 25 containers healthy, felhom-flash default.

Headline: the host-boot ordering is now LIVE-validated — on a real reboot of felhom-pve the shared-parent unit ran before pve-guests, the guest auto-started (onboot=1), both drives re-propagated and all 8 apps converged with no manual intervention.

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Phase A — lifecycle fixes

Item	Result	Where
Boot-id determinism	✅ agent v0.36.0 emits guest_boot_id (<host-btime>-<guest-init-starttime>); controller v0.68.0 persists LastGuestBootID + processGuestBootChange recreates all deployed drive-backed present apps on change. v0.68.1: state-independent (was missing apps docker hadn't restarted yet).	internal/localapi/intermediary.go (GuestBootID), internal/web/intermediary.go (shouldRecreateOnBoot), settings.go
H2 decommission button	✅ "Leszerelés" on every connected drive → migrate-then-decommission (target select) OR decommission-anyway (type-to-confirm). Server side was already complete; new model never touches the parent mp.	templates/settings.html (storageDecommission)
H3 re-enroll button	✅ "Visszacsatlakoztatás" on decommissioned/ejected drives → clears marker + re-attaches under the parent + restarts gate-stopped apps.	handleStorageReconnect (decommissioned branch)
M1 default reassignment	✅ defaultPromotionTarget: decommissioning the default auto-promotes another schedulable drive (prefers the migrate target); BLOCKS if none.	internal/web/intermediary.go, finalizeDecommissionWith
M3 userdata setgid	✅ skeleton already 2775 on every nested dir; the migrate merge-walk now RE-ASSERTS 2775 (EnsureUserdataDir) on userdata dirs (isUserdataDir) instead of merely preserving the source mode.	internal/stacks/migrate.go

Non-hollow tests (each with a companion that fails the pre-fix impl): TestShouldRecreateOnBoot, TestDefaultPromotionTarget, TestIsUserdataDir, TestStarttimeFromStat. Also fixed the existing H1 {path} vs {where} JS body mismatch.

Phase B — second drive + rslave

• felhom-usb migrated off its stranded legacy bind (stale decommissioned intent cleared via the H3 reconnect → agent guest-attach set intent=enrolled + recorded the bind + bound felhom-data under the parent); registry repointed to /mnt/felhom-drives/felhom-usb; legacy mp1 deleted. Both drives now on the new model.
• rslave is EXPLICIT (not incidental): -v /mnt:/mnt:rslave in the controller bootstrap docker-run (line 50). Verified it survives a controller redeploy (E7).

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Phase C — acceptance sweep (per-item, with evidence)

E1 — HOST REBOOT (the headline) ✅ LIVE-VALIDATED (twice)

reboot issued over SSH; polled SSH return (~70–80 s). From journalctl -b:

felhom-shared-parent.service  Finished  19:50:29   (ExecMainStatus=0)
pve-guests.service            Starting  19:50:35   → "Starting CT 9201"  (onboot=1 auto-start)

The shared parent was made shared before pve-guests; the guest auto-started; both drives re-propagated (BoundUnderParent); /mnt/felhom-usb (legacy) gone. Apps converged via the gate with no manual intervention:

[gate] drive ABSENT /mnt/felhom-drives/felhom-flash — stopped+blocked 8 app(s)
[gate] drive RETURNED /mnt/felhom-drives/felhom-flash — re-attached + restarted gate-stopped apps

Data intact (romm bound to /mnt/felhom-drives/felhom-flash/..., immich-postgres base). The first host reboot (v0.68.0) surfaced a bug — 5 apps stayed exited because the recreate filtered on container state; fixed in v0.68.1 (recreate ALL deployed present apps) + re-validated.

E2 — guest reboot ×3 ✅

Multiple guest reboots; each converged all 8 apps with zero manual starts (the deterministic guest_boot_id recreate + the gate). The final clean reboots showed single bind per drive + no 255.

E3 — drive absent at guest boot ✅ (covered by E1)

The gate's ABSENT→RETURNED path (E1) is exactly this: a drive absent at boot stops+blocks its apps; the guesthook (C1 net) lets the guest boot regardless. The agent re-binds on return → gate restarts.

E4 — drive yanked while running ✅

umount of a running drive → immediate guest-root write to the bare stable path DENIED, no leak to host root. The agent reconcile auto-rebound it; apps stayed healthy. (Gate stop/restart proven by E1.)

E5 — fail-close, capability-proof ✅

With felhom-usb detached, a guest-root write AND a root app container (komga) write to the bare stable path both returned Permission denied — the host-root-owned (unmapped) dir defeats guest-root CAP_DAC_OVERRIDE (what chmod-0000 could not). find showed no file leaked onto host root.

E6 — confinement ✅ (both drives)

Guest sees only userdata (felhom-usb) / appdata backups media userdata (felhom-flash); ls .../dump → not found. The host raw drives carry dump/images/lost+found/... which never cross in.

E7 — controller redeploy ✅

After the controller container restarts, /mnt/felhom-drives is private,slave inside it and it still sees the drive data — proving the :rslave is explicit, not incidental.

E8 — two drives ✅

Detaching felhom-usb left felhom-flash + its 8 apps fully unaffected.

E9 — decommission button (H2) ✅

decommission-anyway on felhom-usb → decommissioned:true, intent decommissioned, bind detached, parent mp untouched (reboot-safe, no brick). Migrate-then-decommission shares the proven handleStorageDecommission.

E10 — re-enroll (H3) ✅ (after a fix)

First attempt FAILED and exposed a real bug: decommission unmounted the RAW drive, so re-enroll bound an empty pve-root dir. Fix (agent v0.36.1): decommission is now a logical retire — DetachDrive the bind but LEAVE the raw mounted, so re-enroll re-binds the real drive. Re-tested: re-enroll → felhom-usb backed by /dev/sdc1[/felhom-data], data intact.

E11 — default reassignment (M1) ✅

Made felhom-usb default, decommissioned it → [gate] default drive reassigned … → … (M1); a default always remained (never zero). The only-drive BLOCK is unit-tested (TestDefaultPromotionTarget).

E12 — eject the drive holding ALL apps ✅ (covered by E1)

E1's felhom-flash ABSENT→RETURNED is exactly this: all 8 apps gated, then auto-restarted on return, reboot-free.

E13 — rapid eject/reconnect ×3 ✅ (after the deepest fix)

Surfaced a double-bind (2 stacked binds per drive). Root-caused to the shared-parent self-bind inheriting /'s shared peer group (/mnt/felhom-drives was shared:1 like /), so every drive bind propagated back and doubled. Fixed across agent v0.36.3–v0.36.7:

• v0.36.3 DetachDrive loop-umounts all stacked layers (full detach → fail-close intact);
• v0.36.4 a mutex serializes Attach/Detach (no TOCTOU double-bind);
• v0.36.5 AttachDrive normalizes to exactly one bind (countHostMounts);
• v0.36.6 the real root cause — make-private before make-shared so the parent owns its own peer group (now shared:51), binds propagate to the guest exactly once;
• v0.36.7 isolate only on create (re-doing it churns the peer-group id and orphans the guest's slave).

End state: single bind per drive, guest sees both, all apps healthy, no leak.

E14 / E15 — migration + setgid (M3) ◑ partial

M3's routing (isUserdataDir) is unit-tested and EnsureUserdataDir enforces 2775; the convention was verified live (/mnt/felhom-drives/felhom-flash/userdata = 2775, gid 1000; FileBrowser bound there). A full live migrate-all round-trip between the two drives was NOT re-run to avoid merging both drives' userdata; the migrate/checksum machinery is the pre-existing, previously-validated path (only the M3 re-assert is new, and it's unit-tested).

Regression ✅

FileBrowser bound to userdata on both new-model drives (2775 group-write); immich-postgres data intact; dashboard + monitoring HTTP 200; no exited containers.

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Surprises / breaks found (and fixed) this run

1. E1 (v0.68.0): boot-id recreate filtered on container state → 5 apps stayed exited after a host reboot. → v0.68.1 recreate ALL deployed present apps (state-independent).
2. E10: decommission unmounted the raw drive → re-enroll bound an empty dir. → v0.36.1 keep raw mounted (logical retire); v0.36.2 same for eject.
3. E13 double-bind: shared-parent inherited /'s peer group → every drive bind doubled. → v0.36.6 make-private before make-shared (own group); v0.36.7 only-on-create (avoid peer-group churn that orphans the guest slave). v0.36.3–.5 are defense-in-depth (loop-detach, mutex, normalize-to-one).
4. Pre-start hook vs agent churn (transient): rebooting the guest immediately after an agent restart raced the agent's parent-bind churn against the guest's mp3 setup → lxc.hook.pre-start exit 255. Resolved by the on-create-only isolation (the parent is no longer churned); a clean guest reboot (no concurrent agent op) returned exit 0. Operational note: don't restart the agent and reboot the guest in the same instant.
5. Device-letter swap: on a host reboot the kernel re-enumerated sdb↔sdc; harmless because all mounts are by fs-UUID.

Residuals (documented, not blocking)

• E14/E15 full live migrate-all not re-run (M3 unit-tested + convention verified live; data-merge risk).
• Boot-id first-sight bounce: a fresh controller (empty LastGuestBootID) recreates apps once on its first start — a one-time cost per data-volume lifetime; subsequent restarts don't bounce.
• "Safely removable" semantics: eject/decommission now leave the raw mounted (re-enrollable); fs-flush-before-physical-pull is the separate "remove from system" action's job (future refinement).

Commit hashes

agent 1e20584 (v0.36.7) · controller 7a85732 (v0.68.1) · catalog 939864f. Agent versions this run: v0.36.0→v0.36.7. Controller: v0.68.0→v0.68.1.