isis: T4739: ISIS segment routing being refactored

This is to refactor ISIS segment routing to match up with OSPF segment routing.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/migration-scripts/isis/1-to-2 b/src/migration-scripts/isis/1-to-2
new file mode 100755
index 000000000..f914ea995
--- /dev/null
+++ b/src/migration-scripts/isis/1-to-2
@@ -0,0 +1,46 @@
+#!/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/>.
+
+# T4739 refactor, and remove "on" from segment routing from the configuration
+
+from sys import argv
+from sys import exit
+
+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()
+
+config = ConfigTree(config_file)
+
+# Check if ISIS segment routing is configured. Then check if segment routing "on" exists, then delete the "on" as it is no longer needed. This is for global configuration.
+if config.exists(['protocols', 'isis']):
+    if config.exists(['protocols', 'isis', 'segment-routing']):
+        if config.exists(['protocols', 'isis', 'segment-routing', 'enable']):
+            config.delete(['protocols', 'isis', 'segment-routing', 'enable'])
+
+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)