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#!/usr/bin/env python3
#
# Copyright (C) 2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os

from sys import exit, argv
from vyos.configtree import ConfigTree

if (len(argv) < 1):
    print("Must specify file name!")
    exit(1)

file_name = argv[1]
with open(file_name, 'r') as f:
    config_file = f.read()

base = ['system', 'sysctl']
config = ConfigTree(config_file)

if not config.exists(base):
    # Nothing to do
    exit(0)

for all_custom in ['all', 'custom']:
    if config.exists(base + [all_custom]):
        for key in config.list_nodes(base + [all_custom]):
            tmp = config.return_value(base + [all_custom, key, 'value'])
            config.set(base + ['parameter', key, 'value'], value=tmp)
            config.set_tag(base + ['parameter'])
        config.delete(base + [all_custom])

for ipv4_param in ['net.ipv4.igmp_max_memberships', 'net.ipv4.ipfrag_time']:
    if config.exists(base + [ipv4_param]):
        tmp = config.return_value(base + [ipv4_param])
        config.set(base + ['parameter', ipv4_param, 'value'], value=tmp)
        config.set_tag(base + ['parameter'])
        config.delete(base + [ipv4_param])

try:
    with open(file_name, 'w') as f:
        f.write(config.to_string())
except OSError as e:
    print("Failed to save the modified config: {}".format(e))
    exit(1)