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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 28 insertions, 49 deletions

diff --git a/src/migration-scripts/bgp/4-to-5 b/src/migration-scripts/bgp/4-to-5
index c4eb9ec72..d779eb11e 100755..100644
--- a/src/migration-scripts/bgp/4-to-5
+++ b/src/migration-scripts/bgp/4-to-5
@@ -1,67 +1,46 @@
-#!/usr/bin/env python3
+# Copyright 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/>.
 
 # Delete 'protocols bgp address-family ipv6-unicast route-target vpn
 # import/export', if 'protocols bgp address-family ipv6-unicast
 # route-target vpn both' exists
 
-from sys import argv
-from sys import exit
-
 from vyos.configtree import ConfigTree
 
-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)
-
-bgp_base = ['protocols', 'bgp']
-# Delete 'import/export' in default vrf if 'both' exists
-if config.exists(bgp_base):
-    for address_family in ['ipv4-unicast', 'ipv6-unicast']:
-        rt_path = bgp_base + ['address-family', address_family, 'route-target',
-                              'vpn']
-        if config.exists(rt_path + ['both']):
-            if config.exists(rt_path + ['import']):
-                config.delete(rt_path + ['import'])
-            if config.exists(rt_path + ['export']):
-                config.delete(rt_path + ['export'])
-
-# Delete import/export in vrfs if both exists
-if config.exists(['vrf', 'name']):
-    for vrf in config.list_nodes(['vrf', 'name']):
-        vrf_base = ['vrf', 'name', vrf]
+def migrate(config: ConfigTree) -> None:
+    bgp_base = ['protocols', 'bgp']
+    # Delete 'import/export' in default vrf if 'both' exists
+    if config.exists(bgp_base):
         for address_family in ['ipv4-unicast', 'ipv6-unicast']:
-            rt_path = vrf_base + bgp_base + ['address-family', address_family,
-                                             'route-target', 'vpn']
+            rt_path = bgp_base + ['address-family', address_family, 'route-target',
+                                  'vpn']
             if config.exists(rt_path + ['both']):
                 if config.exists(rt_path + ['import']):
                     config.delete(rt_path + ['import'])
                 if config.exists(rt_path + ['export']):
                     config.delete(rt_path + ['export'])
 
-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)
+    # Delete import/export in vrfs if both exists
+    if config.exists(['vrf', 'name']):
+        for vrf in config.list_nodes(['vrf', 'name']):
+            vrf_base = ['vrf', 'name', vrf]
+            for address_family in ['ipv4-unicast', 'ipv6-unicast']:
+                rt_path = vrf_base + bgp_base + ['address-family', address_family,
+                                                 'route-target', 'vpn']
+                if config.exists(rt_path + ['both']):
+                    if config.exists(rt_path + ['import']):
+                        config.delete(rt_path + ['import'])
+                    if config.exists(rt_path + ['export']):
+                        config.delete(rt_path + ['export'])