# Copyright 2021-2024 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 "set system conntrack modules gre" option

from vyos.configtree import ConfigTree


def migrate(config: ConfigTree) -> None:
    if not config.exists(['system', 'conntrack', 'modules', 'gre']):
        return

    # Delete abandoned node
    config.delete(['system', 'conntrack', 'modules', 'gre'])