add graphical.virt module

graphical/default.nix

@@ -15,6 +15,7 @@ in
     ./games
     ./jp.nix
     ./mpv.nix
+    ./virt.nix
   ];
 
   options.nixowos.${name} = {

graphical/virt.nix

@@ -0,0 +1,33 @@
+{
+  lib,
+  config,
+  ...
+}:
+
+let
+  name = "virt";
+  cfg = config.nixowos.graphical.${name};
+in
+{
+  options.nixowos.graphical.${name} = {
+    enable = lib.mkEnableOption name;
+
+    user = lib.mkOption {
+      type = lib.types.nullOr lib.types.str;
+      default = null;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = cfg.user != null;
+        message = "you must set nixowos.graphical.${name}.user";
+      }
+    ];
+
+    programs.virt-manager.enable = true;
+    virtualisation.libvirtd.enable = true;
+    users.users.${cfg.user}.extraGroups = [ "libvirtd" ];
+  };
+}