ipv6: T4346: delete (migrate) CLI command to disable IPv6 address family

1 files changed, 50 insertions, 0 deletions

diff --git a/src/migration-scripts/system/22-to-23 b/src/migration-scripts/system/22-to-23
new file mode 100755
index 000000000..7f832e48a
--- /dev/null
+++ b/src/migration-scripts/system/22-to-23
@@ -0,0 +1,50 @@
+#!/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/>.
+
+import os
+
+from sys import exit, argv
+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()
+
+base = ['system', 'ipv6']
+config = ConfigTree(config_file)
+
+if not config.exists(base):
+    # Nothing to do
+    exit(0)
+
+# T4346: drop support to disbale IPv6 address family within the OS Kernel
+if config.exists(base + ['disable']):
+    config.delete(base + ['disable'])
+    # IPv6 address family disable was the only CLI option set - we can cleanup
+    # the entire tree
+    if len(config.list_nodes(base)) == 0:
+        config.delete(base)
+
+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)