#!/usr/bin/env python3
#
# Copyright (C) 2020 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/>.

# Rename link nodes to source-interface for the following interface types:
# - vxlan
# - pseudo-ethernet

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

if __name__ == '__main__':
    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()

    config = ConfigTree(config_file)

    for if_type in ['vxlan', 'pseudo-ethernet']:
        base = ['interfaces', if_type]
        if not config.exists(base):
            # Nothing to do
            continue

        # list all individual interface isntance
        for i in config.list_nodes(base):
            iface = base + [i]
            if config.exists(iface + ['link']):
                config.rename(iface + ['link'], 'source-interface')

    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)