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NoSignal-OS/os updates/kernel-reboot-notify/README.md
28allday 19fd794b6b NoSignal — fully-offline Arch → Hyprland desktop installer 
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>
2026-06-21 11:03:10 +01:00

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kernel-reboot-notify

Symptom / gap

When nosignal-update (or any pacman -Syu/yay) installs a new kernel, nothing tells the user to reboot. The new kernel + modules are written to disk, but the old kernel keeps running — and its /usr/lib/modules/<running> dir has been replaced, so the live session can no longer load matching modules (USB, filesystems, etc. can fail to load on demand). On NoSignal this also means the freshly-built UKI isn't booted yet. The user only finds out when something breaks — or, with F4, when they reboot and the default entry drops to a TTY.

Fix

  1. nosignal-reboot-check (→ ~/.local/bin): if the running kernel's modules dir is gone (the update replaced it), it writes a stamp ($XDG_STATE_HOME/nosignal/reboot-required), prints a yellow banner, and raises a critical desktop notification ("Kernel updated — reboot to load it (X → Y)"). It clears the stamp once the running kernel matches disk again.
  2. 95-nosignal-kernel-reboot.hook (→ /etc/pacman.d/hooks): a PostTransaction Path hook on usr/lib/modules/*/vmlinuz that prints a reboot reminder in the pacman/yay output — so updates done outside nosignal-update warn too.
  3. nosignal-update wiring: calls nosignal-reboot-check as its last step, so an interactive update ends with the reminder + notification.

The installer (install-kernel-reboot-notify.sh) does all three idempotently. The pacman-hook step needs root.

Optional (builder): re-warn at login until rebooted

Add nosignal-reboot-check to an exec-once (e.g. alongside nosignal-welcome in hypr-user.conf) so a pending reboot is re-surfaced each login while the stamp exists. Not included by default to avoid touching hypr-user.conf here.

Builder integration

Ship nosignal-reboot-check in the layer's bin, ship the pacman hook in the ISO, and add the one-line call to the canonical nosignal-update (the installer shows the exact insertion). Pairs with F4: until F4 is fixed the reboot notice tells the user to pick the UKI entry.

Verify

# simulate (don't actually remove modules): the helper keys off
# /usr/lib/modules/$(uname -r) — present now, so it's a no-op:
nosignal-reboot-check; echo "exit=$?"
# after a real kernel update it prints the banner + notifies and stamps
# ~/.local/state/nosignal/reboot-required

Files

  • nosignal-reboot-check — detector + notifier.
  • 95-nosignal-kernel-reboot.hook — pacman PostTransaction reminder.
  • install-kernel-reboot-notify.sh — idempotent installer (hook step needs root).
  • migrations/1781438400-kernel-reboot-notify.sh — delegates to it.