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  family = ssconf.SimpleStore().GetPrimaryIPFamily()

  # family will default to AF_INET if there is no ssconf file (e.g. when

  # upgrading a cluster from 2.2 -> 2.3. This is intended, as Ganeti clusters

  # <= 2.2 can not be AF_INET6

    optionparser.add_option("-i", "--interface", dest="bind_interface",

                            help=("Bind interface"), metavar="INTERFACE")

  if getattr(options, "bind_interface", None) is not None:

    if options.bind_address != default_bind_address:

      msg = ("Can't specify both, bind address (%s) and bind interface (%s)" %

             (options.bind_address, options.bind_interface))

      print >> sys.stderr, msg

      sys.exit(constants.EXIT_FAILURE)

    interface_ip_addresses = \

      netutils.GetInterfaceIpAddresses(options.bind_interface)

    if family == netutils.IP6Address.family:

      if_addresses = interface_ip_addresses[constants.IP6_VERSION]

    else:

      if_addresses = interface_ip_addresses[constants.IP4_VERSION]

    if len(if_addresses) < 1:

      msg = "Failed to find IP for interface %s" % options.bind_interace

      print >> sys.stderr, msg

      sys.exit(constants.EXIT_FAILURE)

    options.bind_address = if_addresses[0]