F3 from the apt-sweep backlog. `homelab apt-upgrade --safe ...` takes a
pre-upgrade snapshot per LXC before launching the apt run, so rollback is
trivial if anything regresses.
Snapshot strategy per target:
- LXC: try `pct snapshot <id> preupgrade_<timestamp>` first (CoW, near
instant). If that refuses ("snapshot feature is not available" — the
failure mode for LXCs with host bind-mounts like `mp0: /mnt/library`),
fall back to `vzdump <id> --mode snapshot --storage local --compress
zstd`. Slower but works on bind-mounted LXCs.
- hubris (PVE host): skipped intentionally; no host-level snapshot in v1.
If any snapshot fails the entire run refuses unless --force is passed.
Snapshot rollback hints are printed after launch so the operator has the
recovery path one copy/paste away.
Validated 2026-05-21: py_compile clean; --status mode works on bind-
mounted LXCs (skips snapshot path). Live snapshot test deferred to next
real fleet sweep to avoid leaving stale artifacts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dtoro
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