{ pkgs, ... }:
let
  prepare-host-script = pkgs.writeShellApplication {
    name = "prepare-host.sh";
    text = ''
      echo "Removing machine-id"
      rm -f /etc/machine-id || true

      echo "Removing SSH host keys"
      rm -f /etc/ssh/ssh_host_* || true

      echo "Restarting SSH"
      systemctl restart sshd

      echo "Removing temporary files"
      rm -rf /tmp/* || true

      echo "Removing logs"
      journalctl --rotate || true
      journalctl --vacuum-time=1s || true

      echo "Removing cache"
      rm -rf /var/cache/* || true
    '';
  };
in
{
  environment.systemPackages = [ prepare-host-script ];
  users.motd = "Prepare host by running 'prepare-host.sh'.";
}