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#!/usr/bin/env python3
#
# Copyright (C) 2022 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/>.
# T4257: Discussion on changing BGP autonomous system number syntax
from sys import argv
from sys import exit
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()
config = ConfigTree(config_file)
# Check if BGP is even configured. Then check if local-as exists, then add the system-as, then remove the local-as. This is for global configuration.
if config.exists(['protocols', 'bgp']):
if config.exists(['protocols', 'bgp', 'local-as']):
config.rename(['protocols', 'bgp', 'local-as'], 'system-as')
# Check if vrf names are configured. Then check if local-as exists inside of a name, then add the system-as, then remove the local-as. This is for vrf configuration.
if config.exists(['vrf', 'name']):
for vrf in config.list_nodes(['vrf', 'name']):
if config.exists(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as']):
config.rename(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as'], 'system-as')
try:
with open(file_name, 'w') as f:
f.write(config.to_string())
except OSError as e:
print(f'Failed to save the modified config: {e}')
exit(1)

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