# Copyright (C) 2015 Canonical Ltd.
# Copyright (C) 2015 VMware Inc.
#
# Author: Sankar Tanguturi <stanguturi@vmware.com>
#
# This file is part of cloud-init. See LICENSE file for license information.


class Ipv4ModeEnum(object):
    """
    The IPv4 configuration mode which directly represents the user's goal.

    This mode effectively acts as a contract of the in-guest customization
    engine. It must be set based on what the user has requested and should
    not be changed by those layers. It's up to the in-guest engine to
    interpret and materialize the user's request.
    """

    # The legacy mode which only allows dhcp/static based on whether IPv4
    # addresses list is empty or not
    IPV4_MODE_BACKWARDS_COMPATIBLE = 'BACKWARDS_COMPATIBLE'

    # IPv4 must use static address. Reserved for future use
    IPV4_MODE_STATIC = 'STATIC'

    # IPv4 must use DHCPv4. Reserved for future use
    IPV4_MODE_DHCP = 'DHCP'

    # IPv4 must be disabled
    IPV4_MODE_DISABLED = 'DISABLED'

    # IPv4 settings should be left untouched. Reserved for future use
    IPV4_MODE_AS_IS = 'AS_IS'

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