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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 33 insertions, 54 deletions

diff --git a/src/migration-scripts/bgp/3-to-4 b/src/migration-scripts/bgp/3-to-4
index 894cdda2b..842aef0ce 100755..100644
--- a/src/migration-scripts/bgp/3-to-4
+++ b/src/migration-scripts/bgp/3-to-4
@@ -1,64 +1,43 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023 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/>.
 
 # T5150: Rework CLI definitions to apply route-maps between routing daemons
 #        and zebra/kernel
 
-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']
-# Check if BGP is configured - if so, migrate the CLI node
-if config.exists(bgp_base):
-    if config.exists(bgp_base + ['route-map']):
-        tmp = config.return_value(bgp_base + ['route-map'])
-
-        config.set(['system', 'ip', 'protocol', 'bgp', 'route-map'], value=tmp)
-        config.set_tag(['system', 'ip', 'protocol'])
-        config.delete(bgp_base + ['route-map'])
-
-
-# Check if vrf names are configured. Check if BGP is configured - if so, migrate
-# the CLI node(s)
-if config.exists(['vrf', 'name']):
-    for vrf in config.list_nodes(['vrf', 'name']):
-        vrf_base = ['vrf', 'name', vrf]
-        if config.exists(vrf_base + ['protocols', 'bgp', 'route-map']):
-            tmp = config.return_value(vrf_base + ['protocols', 'bgp', 'route-map'])
-
-            config.set(vrf_base + ['ip', 'protocol', 'bgp', 'route-map'], value=tmp)
-            config.set_tag(vrf_base + ['ip', 'protocol', 'bgp'])
-            config.delete(vrf_base + ['protocols', 'bgp', 'route-map'])
-
-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)
+def migrate(config: ConfigTree) -> None:
+    bgp_base = ['protocols', 'bgp']
+    # Check if BGP is configured - if so, migrate the CLI node
+    if config.exists(bgp_base):
+        if config.exists(bgp_base + ['route-map']):
+            tmp = config.return_value(bgp_base + ['route-map'])
+
+            config.set(['system', 'ip', 'protocol', 'bgp', 'route-map'], value=tmp)
+            config.set_tag(['system', 'ip', 'protocol'])
+            config.delete(bgp_base + ['route-map'])
+
+
+    # Check if vrf names are configured. Check if BGP is configured - if so, migrate
+    # the CLI node(s)
+    if config.exists(['vrf', 'name']):
+        for vrf in config.list_nodes(['vrf', 'name']):
+            vrf_base = ['vrf', 'name', vrf]
+            if config.exists(vrf_base + ['protocols', 'bgp', 'route-map']):
+                tmp = config.return_value(vrf_base + ['protocols', 'bgp', 'route-map'])
+
+                config.set(vrf_base + ['ip', 'protocol', 'bgp', 'route-map'], value=tmp)
+                config.set_tag(vrf_base + ['ip', 'protocol', 'bgp'])
+                config.delete(vrf_base + ['protocols', 'bgp', 'route-map'])