# Copyright 2020-2024 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/>.

# rename WWAN (wirelessmodem) serial interface from non persistent ttyUSB2 to
# a bus like name, e.g. "usb0b1.3p1.3"

import os

from vyos.configtree import ConfigTree

base = ['interfaces', 'wirelessmodem']

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

    for wwan in config.list_nodes(base):
        if config.exists(base + [wwan, 'device']):
            device = config.return_value(base + [wwan, 'device'])

            for root, dirs, files in os.walk('/dev/serial/by-bus'):
                for file in files:
                    device_file = os.path.realpath(os.path.join(root, file))
                    if os.path.basename(device_file) == device:
                        config.set(base + [wwan, 'device'], value=file, replace=True)