# File lib/vagrant-libvirt/provider.rb, line 83
      def mac_addresses
        # Run a custom action called "read_mac_addresses" which will return
        # a list of mac addresses used by the machine. The returned data will
        # be in the following format:
        #
        # {
        #   <ADAPTER_ID>: <MAC>
        # }
        env = @machine.action('read_mac_addresses')
        env[:machine_mac_addresses]
      end