migration: T6007: convert all migration scripts to load as module

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 12 insertions, 33 deletions

diff --git a/src/migration-scripts/interfaces/18-to-19 b/src/migration-scripts/interfaces/18-to-19
index c3209f250..ae1a07adb 100755..100644
--- a/src/migration-scripts/interfaces/18-to-19
+++ b/src/migration-scripts/interfaces/18-to-19
@@ -1,24 +1,20 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2021 VyOS maintainers and contributors
+# 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 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,
+# 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 General Public License for more details.
+# 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 General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# 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/>.
 
 import os
 
-from sys import argv
-from sys import exit
-
 from vyos.configtree import ConfigTree
 
 def replace_nat_interfaces(config, old, new):
@@ -40,21 +36,11 @@ def replace_nat_interfaces(config, old, new):
                     config.set(conf_rule + ['outbound-interface'], value=new)
 
 
-if __name__ == '__main__':
-    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()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'wirelessmodem']
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     new_base = ['interfaces', 'wwan']
     config.set(new_base)
@@ -98,10 +84,3 @@ if __name__ == '__main__':
 
         # the new wwan interface use regular IP addressing
         config.set(new_base + [interface, 'address'], value='dhcp')
-
-    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)