nixos-modules/host: move host.tapScript default to option

Author: astro

nixos-modules/host/default.nix

@@ -367,10 +367,6 @@ in
       wants = map (name: "microvm@${name}.service") config.microvm.autostart;
     };
 
-    microvm.host.tapScript = lib.mkDefault ''
-      ${pkgs.iproute2}/bin/ip link set $id up
-    '';
-
     # This helper creates tap interfaces and attaches them to a bridge
     # for qemu regardless if it is run as root or not.
     security.wrappers.qemu-bridge-helper = lib.mkIf (!config.virtualisation.libvirtd.enable) {

nixos-modules/host/options.nix

@@ -37,6 +37,9 @@
         ''${pkgs.iproute2}/bin/ip link set "$id" master br0 up
       '';
       type = types.lines;
+      default = ''
+        ${pkgs.iproute2}/bin/ip link set "$id" up
+      '';
     };
 
     vms = mkOption {