nixos/iotop: make package overridable (#397921)

in

{

  options = {

    programs.iotop.enable = lib.mkEnableOption "iotop + setcap wrapper";

    programs.iotop = {

      enable = lib.mkEnableOption "iotop + setcap wrapper";

      package = lib.mkPackageOption pkgs "iotop" { example = "iotop-c"; };

    };

  };

  config = lib.mkIf cfg.enable {

    security.wrappers.iotop = {

      owner = "root";

      group = "root";

      capabilities = "cap_net_admin+p";

      source = "${pkgs.iotop}/bin/iotop";

      source = lib.getExe cfg.package;

    };

  };

}