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#!/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/>.

# - T2903: Change vif-s ethertype from numeric number to literal
#   - 0x88a8 -> 802.1ad
#   - 0x8100 -> 802.1q
# - T2905: Change WWAN "ondemand" node to "connect-on-demand" to have identical
#   CLI nodes for both types of dialer interfaces

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)

    #
    # T2903
    #
    for type in config.list_nodes(['interfaces']):
        for interface in config.list_nodes(['interfaces', type]):
            if not config.exists(['interfaces', type, interface, 'vif-s']):
                continue

            for vif_s in config.list_nodes(['interfaces', type, interface, 'vif-s']):
                base_path = ['interfaces', type, interface, 'vif-s', vif_s]
                if config.exists(base_path + ['ethertype']):
                    protocol = '802.1ad'
                    tmp = config.return_value(base_path + ['ethertype'])
                    if tmp == '0x8100':
                        protocol = '802.1q'

                    config.set(base_path + ['protocol'], value=protocol)
                    config.delete(base_path + ['ethertype'])

    #
    # T2905
    #
    wwan_base = ['interfaces', 'wirelessmodem']
    if config.exists(wwan_base):
        for interface in config.list_nodes(wwan_base):
            if config.exists(wwan_base + [interface, 'ondemand']):
                config.rename(wwan_base + [interface, 'ondemand'], 'connect-on-demand')

    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)