# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

# Delete 'system ipv6 blacklist' option as the IPv6 module can no longer be
# blacklisted as it is required by e.g. WireGuard and thus will always be
# loaded.

import os

ipv6_blacklist_file = '/etc/modprobe.d/vyatta_blacklist_ipv6.conf'

from vyos.configtree import ConfigTree

ip_base = ['system', 'ipv6']

def migrate(config: ConfigTree) -> None:
    if not config.exists(ip_base):
        # Nothing to do
        return

    # delete 'system ipv6 blacklist' node
    if config.exists(ip_base + ['blacklist']):
        config.delete(ip_base + ['blacklist'])
        if os.path.isfile(ipv6_blacklist_file):
            os.unlink(ipv6_blacklist_file)