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feat(systemd): add shutdown/boot hang diagnostics module

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Shutdown stalls are hard to debug because journald is torn down mid-way,
so late hangs never reach the journal. `modules/shutdown-debug.nix`
exposes `local.shutdownDebug.*`: verbose systemd logging routed to kmsg
(recoverable from pstore after a forced power-off), an opt-in tty9 debug
shell, and a shortened `DefaultTimeoutStopSec` preset (system + user) so
a hung unit is killed and logged in seconds instead of spinning at 90s.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Daniel Fainberg
2026-07-12 14:47:30 +02:00
parent 98eb0f87ba
commit de6c3993cc
3 changed files with 98 additions and 0 deletions
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README.md
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@@ -71,3 +71,7 @@ hosts/example/ # the template host (placeholder hardware-configuration.nix
```
Shared `*.nix` / `*.lock` live at the top level; per-host files under `hosts/<host>/`.
Chasing a shutdown/boot hang? `modules/shutdown-debug.nix` exposes `local.shutdownDebug.*`
(verbose systemd logging to kmsg, a tty9 debug shell, a shortened stop-timeout) — see its
header comment for how to read the evidence.