liminalOS/modules/linux/greeter/default.nix

{ pkgs, ... }:
{
  services.greetd = {
    enable = true;
    settings = {
      default_session = {
        command = ''
          ${pkgs.greetd.tuigreet}/bin/tuigreet --time --cmd Hyprland --remember --greeting "Welcome to liminalOS. This is system generation $(readlink /nix/var/nix/profiles/system | grep -o '[0-9]*'). Access is restricted to authorized personnel only."
        '';
        user = "greeter";
      };
    };
  };

  systemd.services.greetd.serviceConfig = {
    Type = "idle";
    StandardInput = "tty";
    StandardOutput = "tty";
    StandardError = "journal"; # Without this errors will spam on screen
    # Without these bootlogs will spam on screen
    TTYReset = true;
    TTYVHangup = true;
    TTYVTDisallocate = true;
  };
}