54 lines
1.5 KiB
Nix
54 lines
1.5 KiB
Nix
{ lib
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, config
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, self
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, ...
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}:
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with lib;
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let
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cfg = config.mySystem.services.rebootRequiredCheck;
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in
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{
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options.mySystem.services.rebootRequiredCheck.enable = mkEnableOption "Reboot required check";
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config = mkIf cfg.enable {
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# Enable timer
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systemd.timers."reboot-required-check" = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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# start at boot
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OnBootSec = "0m";
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# check every hour
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OnUnitActiveSec = "1h";
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Unit = "reboot-required-check.service";
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};
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};
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# Below script will check if initrd, kernel, kernel-modules that were booted match the current system
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# i.e. if a nixos-rebuild switch has upgraded anything
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systemd.services."reboot-required-check" = {
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script = ''
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#!/usr/bin/env bash
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# compare current system with booted sysetm to determine if a reboot is required
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if [[ "$(readlink /run/booted-system/{initrd,kernel,kernel-modules})" == "$(readlink /run/current-system/{initrd,kernel,kernel-modules})" ]]; then
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# check if the '/var/run/reboot-required' file exists and if it does, remove it
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if [[ -f /var/run/reboot-required ]]; then
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rm /var/run/reboot-required || { echo "Failed to remove /var/run/reboot-required"; exit 1; }
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fi
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else
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echo "reboot required"
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touch /var/run/reboot-required || { echo "Failed to create /var/run/reboot-required"; exit 1; }
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fi
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'';
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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};
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};
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};
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}
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