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14-to-15
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	#!/usr/bin/env python3
	#
	# Delete 'system ipv6 blacklist' option as the IPv6 module can no longer be
	# blacklisted as it is required by e.g. WireGuard and thus will always be
	# loaded.

	import os
	import sys

	ipv6_blacklist_file = '/etc/modprobe.d/vyatta_blacklist_ipv6.conf'

	from vyos.configtree import ConfigTree

	if (len(sys.argv) < 1):
	print("Must specify file name!")
	sys.exit(1)

	file_name = sys.argv[1]

	with open(file_name, 'r') as f:
	config_file = f.read()

	config = ConfigTree(config_file)
	ip_base = ['system', 'ipv6']
	if not config.exists(ip_base):
	# Nothing to do
	sys.exit(0)
	else:
	# delete 'system ipv6 blacklist' node
	if config.exists(ip_base + ['blacklist']):
	config.delete(ip_base + ['blacklist'])
	if os.path.isfile(ipv6_blacklist_file):
	os.unlink(ipv6_blacklist_file)

	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))
	sys.exit(1)