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# Copyright 2021-2024 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/>.
# - 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 vyos.configtree import ConfigTree
base = ['protocols', 'bgp']
def migrate(config: ConfigTree) -> None:
if not config.exists(base):
# Nothing to do
return
# 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)
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