# File lib/vagrant-libvirt/config.rb, line 384
      def input(options = {})
        if options[:type].nil? || options[:bus].nil?
          raise 'Input type AND bus must be specified'
        end

        @inputs = [] if @inputs == UNSET_VALUE

        @inputs.push(type: options[:type],
                     bus:  options[:bus])
      end