virt: add vagrant

services/virt-manager.nix

@@ -1,6 +1,7 @@
 {
   config,
   lib,
+  pkgs,
   ...
 }:
 
@@ -14,4 +15,24 @@ mkIf (elem "virt-manager" config.machine.services) {
       uris = [ "qemu:///system" ];
     };
   };
+
+  services.nfs.server.enable = true;
+
+  # rule for vagrant virtualbox provider.
+  networking.firewall.extraCommands = lib.optionalString (config.virtualisation.virtualbox.host.enable) ''
+    ip46tables -I INPUT 1 -i vboxnet+ -p tcp -m tcp --dport 2049 -j ACCEPT
+  '';
+
+  # Add firewall exception for libvirt provider when using NFSv4
+  networking.firewall.interfaces."virbr1" = {
+    allowedTCPPorts = [ 2049 ];
+    allowedUDPPorts = [ 2049 ];
+  };
+
+  environment = {
+    systemPackages = with pkgs; [
+      vagrant
+    ];
+    variables.VAGRANT_DEFAULT_PROVIDER = "libvirt";
+  };
 }