Add nixos guest capability: nfs_client_installed

plugins/guests/nixos/cap/nfs_client.rb

@@ -0,0 +1,11 @@
+module VagrantPlugins
+  module GuestNixos
+    module Cap
+      class NFSClient
+        def self.nfs_client_installed(machine)
+          machine.communicate.test("test -x /run/current-system/sw/sbin/mount.nfs")
+        end
+      end
+    end
+  end
+end

plugins/guests/nixos/plugin.rb

@@ -20,6 +20,11 @@ module VagrantPlugins
         require_relative "cap/change_host_name"
         Cap::ChangeHostName
       end
+
+      guest_capability("nixos", "nfs_client_installed") do
+        require_relative "cap/nfs_client"
+        Cap::NFSClient
+      end
     end
   end
 end