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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/>.
# - T3391: Migrate "maximum-paths" setting from "protocols bgp asn maximum-paths"
# under the IPv4 address-family tree. Reason is we currently have no way in
# configuring this for IPv6 address-family. This mimics the FRR configuration.
from sys import argv
from sys import exit
from vyos.configtree import ConfigTree
if len(argv) < 2:
print("Must specify file name!")
exit(1)
file_name = argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
base = ['protocols', 'bgp']
config = ConfigTree(config_file)
if not config.exists(base):
# Nothing to do
exit(0)
# Check if BGP is actually configured and obtain the ASN
asn_list = config.list_nodes(base)
if asn_list:
# There's always just one BGP node, if any
bgp_base = base + [asn_list[0]]
maximum_paths = bgp_base + ['maximum-paths']
if config.exists(maximum_paths):
for bgp_type in ['ebgp', 'ibgp']:
if config.exists(maximum_paths + [bgp_type]):
new_base = bgp_base + ['address-family', 'ipv4-unicast', 'maximum-paths']
config.set(new_base)
config.copy(maximum_paths + [bgp_type], new_base + [bgp_type])
config.delete(maximum_paths)
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)

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