nixos/tzupdate: make enabled module actually be enabled (#361373)

        update the timezone.

      '';

    };

    package = lib.mkPackageOption pkgs "tzupdate" { };

    timer.enable = lib.mkOption {

      type = lib.types.bool;

      default = true;

      description = ''

        Enable the tzupdate timer to update the timezone automatically.

      '';

    };

    timer.interval = lib.mkOption {

      type = lib.types.str;

      default = "hourly";

      description = ''

        The interval at which the tzupdate timer should run. See

        {manpage}`systemd.time(7)` to understand the format.

      '';

    };

  };

  config = lib.mkIf cfg.enable {

    # zone, which is better than silently overriding it.

    time.timeZone = null;

    # We provide a one-shot service which can be manually run. We could

    # provide a service that runs on startup, but it's tricky to get

    # a service to run after you have *internet* access.

    # We provide a one-shot service that runs at startup once network

    # interfaces are up, but we can’t ensure we actually have Internet access

    # at that point. It can also be run manually with `systemctl start tzupdate`.

    systemd.services.tzupdate = {

      description = "tzupdate timezone update service";

      wantedBy = [ "multi-user.target" ];

      wants = [ "network-online.target" ];

      after = [ "network-online.target" ];

      script = ''

        timezone="$(${lib.getExe pkgs.tzupdate} --print-only)"

        timezone="$(${lib.getExe cfg.package} --print-only)"

        if [[ -n "$timezone" ]]; then

          echo "Setting timezone to '$timezone'"

          timedatectl set-timezone "$timezone"

        Type = "oneshot";

      };

    };

    systemd.timers.tzupdate = {

      enable = cfg.timer.enable;

      interval = cfg.timer.interval;

      timerConfig = {

        OnStartupSec = "30s";

        OnCalendar = cfg.timer.interval;

        Persistent = true;

      };

      wantedBy = [ "timers.target" ];

    };

  };

  meta.maintainers = with lib.maintainers; [ doronbehar ];