examples.nix

{config, pkgs, lib, ...}:
with lib;
{
  systemd.services.update-freemyip =
  {
    description = "Updates FreeMyIP";

    path = [ pkgs.curl ];

    serviceConfig =
    {
      Type = "oneshot";
      User = "nobody";
    };
    script = ''
      set -ex
      curl https://freemyip.com/update?token=$TOKEN
    '';
  };

  systemd.timers.update-freemyip =
  {
    wantedBy = [ "timers.target" ];
    timerConfig =
    {
      OnCalendar = "*:0/30";
      Persistent = "yes";
    };
  };
}