# File lib/vagrant-libvirt/action/prepare_nfs_settings.rb, line 16
        def call(env)
          @machine = env[:machine]
          @app.call(env)

          if using_nfs?
            @logger.info('Using NFS, preparing NFS settings by reading host IP and machine IP')
            env[:nfs_machine_ip] = read_machine_ip(env[:machine])
            env[:nfs_host_ip]    = read_host_ip(env[:nfs_machine_ip])

            @logger.info("host IP: #{env[:nfs_host_ip]} machine IP: #{env[:nfs_machine_ip]}")

            raise Vagrant::Errors::NFSNoHostonlyNetwork if !env[:nfs_machine_ip] || !env[:nfs_host_ip]
          end
        end