nixos-config/shared/systemd.nix

{ pkgs, lib, ... }:

{
  systemd = {

    # package = lib.mkDefault (nixpkgs-systemd-256.legacyPackages.x86_64-linux.systemd.override { withHomed = false; });
    package = lib.mkDefault (pkgs.systemd.override { withHomed = false; });
    sleep.extraConfig = ''
      HibernateDelaySec=2h
    '';
    oomd = {
      enable = true;
      enableSystemSlice = true;
      enableRootSlice = true;
      enableUserSlices = true;
    };
    watchdog = {
      runtimeTime = "30s";
      rebootTime = "10m";
    };
  };

  # https://github.com/NixOS/nixpkgs/pull/351151#issuecomment-2440083015
  # fix hosts using impermanence
  boot.initrd.systemd.suppressedUnits = [ "systemd-machine-id-commit.service" ];
  systemd.suppressedSystemUnits = [ "systemd-machine-id-commit.service" ];

}