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Single-script builder (nosignal.sh) that turns a stock Arch Linux ISO into a fully-offline installer for a themed Hyprland + caelestia (Quickshell) desktop: matching SDDM greeter, Btrfs/Limine bootable snapshots, chwd-style GPU detection, and a curated "os updates" layer (keybind cheatsheet, settings panels, system polish, on-box management skill). See README.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
51 lines
2.6 KiB
Markdown
Executable file
51 lines
2.6 KiB
Markdown
Executable file
# kernel-reboot-notify
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## Symptom / gap
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When `nosignal-update` (or any `pacman -Syu`/`yay`) installs a **new kernel**,
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nothing tells the user to reboot. The new kernel + modules are written to disk,
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but the **old kernel keeps running** — and its `/usr/lib/modules/<running>` dir
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has been replaced, so the live session can no longer load matching modules
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(USB, filesystems, etc. can fail to load on demand). On NoSignal this also means
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the freshly-built UKI isn't booted yet. The user only finds out when something
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breaks — or, with **F4**, when they reboot and the default entry drops to a TTY.
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## Fix
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1. **`nosignal-reboot-check`** (→ `~/.local/bin`): if the running kernel's
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modules dir is gone (the update replaced it), it writes a stamp
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(`$XDG_STATE_HOME/nosignal/reboot-required`), prints a yellow banner, and
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raises a **critical desktop notification** ("Kernel updated — reboot to load
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it (X → Y)"). It clears the stamp once the running kernel matches disk again.
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2. **`95-nosignal-kernel-reboot.hook`** (→ `/etc/pacman.d/hooks`): a PostTransaction
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Path hook on `usr/lib/modules/*/vmlinuz` that prints a reboot reminder in the
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pacman/yay output — so updates done outside `nosignal-update` warn too.
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3. **`nosignal-update` wiring**: calls `nosignal-reboot-check` as its last step,
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so an interactive update ends with the reminder + notification.
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The installer (`install-kernel-reboot-notify.sh`) does all three idempotently.
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The pacman-hook step needs root.
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### Optional (builder): re-warn at login until rebooted
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Add `nosignal-reboot-check` to an `exec-once` (e.g. alongside `nosignal-welcome`
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in `hypr-user.conf`) so a pending reboot is re-surfaced each login while the
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stamp exists. Not included by default to avoid touching `hypr-user.conf` here.
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## Builder integration
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Ship `nosignal-reboot-check` in the layer's bin, ship the pacman hook in the
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ISO, and add the one-line call to the canonical `nosignal-update` (the installer
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shows the exact insertion). Pairs with **F4**: until F4 is fixed the reboot
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notice tells the user to pick the UKI entry.
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## Verify
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```
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# simulate (don't actually remove modules): the helper keys off
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# /usr/lib/modules/$(uname -r) — present now, so it's a no-op:
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nosignal-reboot-check; echo "exit=$?"
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# after a real kernel update it prints the banner + notifies and stamps
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# ~/.local/state/nosignal/reboot-required
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```
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## Files
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- `nosignal-reboot-check` — detector + notifier.
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- `95-nosignal-kernel-reboot.hook` — pacman PostTransaction reminder.
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- `install-kernel-reboot-notify.sh` — idempotent installer (hook step needs root).
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- `migrations/1781438400-kernel-reboot-notify.sh` — delegates to it.
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