{ config, pkgs, ... }: { # adapted from https://github.com/NixOS/nixpkgs/blob/3428bdf3c93a7608615dddd44dec50c3df89b4be/nixos/modules/tasks/auto-upgrade.nix systemd.services.reboot-after-update = { restartIfChanged = false; unitConfig.X-StopOnRemoval = false; serviceConfig.Type = "oneshot"; path = [ config.systemd.package pkgs.coreutils ]; script = '' booted="$(readlink /run/booted-system/{initrd,kernel,kernel-modules} && cat /run/booted-system/kernel-params)" built="$(readlink /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules} && cat /nix/var/nix/profiles/system/kernel-params)" if [ "''${booted}" != "''${built}" ]; then systemctl reboot fi ''; startAt = "0/3:00"; }; systemd.timers.reboot-after-update = { timerConfig.RandomizedDelaySec = "3h"; }; }