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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 13 insertions, 32 deletions

diff --git a/src/migration-scripts/nat/5-to-6 b/src/migration-scripts/nat/5-to-6
index cfe98ddcf..a583d4eb6 100755..100644
--- a/src/migration-scripts/nat/5-to-6
+++ b/src/migration-scripts/nat/5-to-6
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2024 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/>.
 
 # T5643: move from 'set nat [source|destination] rule X [inbound-interface|outbound interface] <iface>'
 # to
@@ -23,7 +22,7 @@
 #   'set nat [source|destination] rule X [source| destination| translation] address <IP/Netmask| !IP/Netmask>'
 
 import ipaddress
-from sys import argv,exit
+
 from vyos.configtree import ConfigTree
 
 
@@ -62,21 +61,10 @@ def _func_T6100(conf, base_path):
     return
 
 
-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:
     if not config.exists(['nat']):
         # Nothing to do
-        exit(0)
+        return
 
     for direction in ['source', 'destination']:
         # If a node doesn't exist, we obviously have nothing to do.
@@ -92,10 +80,3 @@ if __name__ == '__main__':
             base = ['nat', direction, 'rule', rule]
             _func_T5643(config,base)
             _func_T6100(config,base)
-
-    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)