systemd.user.services.i3lock = {
       description = "starts i3lock as screensaver";
       partOf = [ "graphical-session.target" ];
       wantedBy = [ "graphical-session.target" ];
       serviceConfig = {
         ExecStart = "${pkgs.xss-lock}/bin/xss-lock -- ${pkgs.i3lock}/bin/i3lock";
       };