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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/>.

	# - T3037, BGP address-family ipv6-unicast capability dynamic does not exist in
	# FRR, there is only a base, per neighbor dynamic capability, migrate config

	from sys import argv
	from sys import exit
	from vyos.configtree import ConfigTree
	from vyos.template import is_ipv4
	from vyos.template import is_ipv6

	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]]

	for neighbor_type in ['neighbor', 'peer-group']:
	if not config.exists(bgp_base + [neighbor_type]):
	continue
	for neighbor in config.list_nodes(bgp_base + [neighbor_type]):
	# T2844 - add IPv4 AFI disable-send-community support
	send_comm_path = bgp_base + [neighbor_type, neighbor, 'disable-send-community']
	if config.exists(send_comm_path):
	new_base = bgp_base + [neighbor_type, neighbor, 'address-family', 'ipv4-unicast']
	config.set(new_base)
	config.copy(send_comm_path, new_base + ['disable-send-community'])
	config.delete(send_comm_path)

	cap_dynamic = False
	peer_group = None
	for afi in ['ipv4-unicast', 'ipv6-unicast']:
	afi_path = bgp_base + [neighbor_type, neighbor, 'address-family', afi]
	# Exit loop early if AFI does not exist
	if not config.exists(afi_path):
	continue

	cap_path = afi_path + ['capability', 'dynamic']
	if config.exists(cap_path):
	cap_dynamic = True
	config.delete(cap_path)

	# We have now successfully migrated the address-family
	# specific dynamic capability to the neighbor/peer-group
	# level. If this has been the only option under the
	# address-family nodes, we can clean them up by checking if
	# no other nodes are left under that tree and if so, delete
	# the parent.
	#
	# We walk from the most inner node to the most outer one.
	cleanup = -1
	while len(config.list_nodes(cap_path[:cleanup])) == 0:
	config.delete(cap_path[:cleanup])
	cleanup -= 1

	peer_group_path = afi_path + ['peer-group']
	if config.exists(peer_group_path):
	if ((is_ipv4(neighbor) and afi == 'ipv4-unicast') or
	(is_ipv6(neighbor) and afi == 'ipv6-unicast')):
	peer_group = config.return_value(peer_group_path)

	config.delete(peer_group_path)

	# We have now successfully migrated the address-family
	# specific peer-group to the neighbor level. If this has
	# been the only option under the address-family nodes, we
	# can clean them up by checking if no other nodes are left
	# under that tree and if so, delete the parent.
	#
	# We walk from the most inner node to the most outer one.
	cleanup = -1
	while len(config.list_nodes(peer_group_path[:cleanup])) == 0:
	config.delete(peer_group_path[:cleanup])
	cleanup -= 1

	if cap_dynamic:
	config.set(bgp_base + [neighbor_type, neighbor, 'capability', 'dynamic'])
	if peer_group:
	config.set(bgp_base + [neighbor_type, neighbor, 'peer-group'], value=peer_group)

	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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