Modularize everything

modules/services/libvirt.nix

@@ -0,0 +1,20 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+with lib.my;
+
+let cfg = config.modules.services.libvirt;
+in {
+  options.modules.services.libvirt = { enable = mkBoolOpt false; };
+
+  config = mkIf cfg.enable {
+
+    virtualisation = {
+      libvirtd.enable = true;
+      spiceUSBRedirection.enable = true;
+    };
+    users.users.froidmpa.extraGroups = [ "libvirtd" ];
+
+    environment.systemPackages = with pkgs; [ virt-manager ];
+  };
+}