refactor

modules/nixos/apps/virtualbox/default.nix

@@ -0,0 +1,21 @@
+{ options, config, lib, pkgs, ... }:
+
+with lib;
+with lib.plusultra;
+let
+  cfg = config.plusultra.apps.virtualbox;
+in
+{
+  options.plusultra.apps.virtualbox = with types; {
+    enable = mkBoolOpt false "Whether or not to enable Virtualbox.";
+  };
+
+  config = mkIf cfg.enable {
+    virtualisation.virtualbox.host = {
+      enable = true;
+      enableExtensionPack = true;
+    };
+
+    plusultra.user.extraGroups = [ "vboxusers" ];
+  };
+}