nixos-needsreboot

Checks if you should reboot your NixOS ️❄️ machine in case an upgrade brought in a new kernel.

This project is forked from https://github.com/wimpysworld/nixos-needsreboot/, which was forked from https://codeberg.org/Mynacol/nixos-needsreboot, which was forked from https://github.com/thefossguy/nixos-needsreboot.

This version is written in golang (just because that's what I know and love). It includes some cosmetic changes, and a prometheus node_exporter textfile compatible output printer using the --textfile flag.

Usage as a flake

Add nixos-needsreboot to your flake.nix:

{
  inputs.nixos-needsreboot.url = "https://git.dotcircle.dev/dotcircle/nixos-needsreboot/archive/main.tar.gz";

  outputs = { self, nixos-needsreboot }: {
    # Use in your outputs
  };
}

Usage

Check if the currently active system needs a reboot

nixos-needsreboot

Check a different system if it would require a reboot

nixos-needsreboot [/path/to/different-system]

Print the programs version

nixos-needsreboot --version

Output formatted for prometheus node_exporter textfile exporter

nixos-needsreboot --textfile

Output formatted for prometheus node_exporter textfile exporter for a different system

nixos-needsreboot --textfile [/path/to/different-system]

Test during NixOS system activation

  system.activationScripts = {
    nixos-needsreboot = {
      supportsDryActivation = true;
      text = "${lib.getExe nixos-needsreboot.packages.${pkgs.system}.default} \"$systemConfig\" || true";
    };
  };