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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 38 insertions, 56 deletions

diff --git a/src/migration-scripts/dhcp-server/6-to-7 b/src/migration-scripts/dhcp-server/6-to-7
index e6c298a60..4e6583a31 100755..100644
--- a/src/migration-scripts/dhcp-server/6-to-7
+++ b/src/migration-scripts/dhcp-server/6-to-7
@@ -1,76 +1,58 @@
-#!/usr/bin/env python3
+# Copyright 2022-2024 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/>.
 
 # T6079: Disable duplicate static mappings
 
-import sys
 from vyos.configtree import ConfigTree
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
 base = ['service', 'dhcp-server']
-config = ConfigTree(config_file)
-
-if not config.exists(base + ['shared-network-name']):
-    # Nothing to do
-    exit(0)
 
-# Run this for every instance if 'shared-network-name'
-for network in config.list_nodes(base + ['shared-network-name']):
-    base_network = base + ['shared-network-name', network]
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base + ['shared-network-name']):
+        # Nothing to do
+        return
 
-    if not config.exists(base_network + ['subnet']):
-        continue
+    # Run this for every instance if 'shared-network-name'
+    for network in config.list_nodes(base + ['shared-network-name']):
+        base_network = base + ['shared-network-name', network]
 
-    for subnet in config.list_nodes(base_network + ['subnet']):
-        base_subnet = base_network + ['subnet', subnet]
+        if not config.exists(base_network + ['subnet']):
+            continue
 
-        if config.exists(base_subnet + ['static-mapping']):
-            used_mac = []
-            used_ip = []
+        for subnet in config.list_nodes(base_network + ['subnet']):
+            base_subnet = base_network + ['subnet', subnet]
 
-            for mapping in config.list_nodes(base_subnet + ['static-mapping']):
-                base_mapping = base_subnet + ['static-mapping', mapping]
+            if config.exists(base_subnet + ['static-mapping']):
+                used_mac = []
+                used_ip = []
 
-                if config.exists(base_mapping + ['mac-address']):
-                    mac = config.return_value(base_mapping + ['mac-address'])
+                for mapping in config.list_nodes(base_subnet + ['static-mapping']):
+                    base_mapping = base_subnet + ['static-mapping', mapping]
 
-                    if mac in used_mac:
-                        config.set(base_mapping + ['disable'])
-                    else:
-                        used_mac.append(mac)
+                    if config.exists(base_mapping + ['mac-address']):
+                        mac = config.return_value(base_mapping + ['mac-address'])
 
-                if config.exists(base_mapping + ['ip-address']):
-                    ip = config.return_value(base_mapping + ['ip-address'])
+                        if mac in used_mac:
+                            config.set(base_mapping + ['disable'])
+                        else:
+                            used_mac.append(mac)
 
-                    if ip in used_ip:
-                        config.set(base_subnet + ['static-mapping', mapping, 'disable'])
-                    else:
-                        used_ip.append(ip)
+                    if config.exists(base_mapping + ['ip-address']):
+                        ip = config.return_value(base_mapping + ['ip-address'])
 
-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)
+                        if ip in used_ip:
+                            config.set(base_subnet + ['static-mapping', mapping, 'disable'])
+                        else:
+                            used_ip.append(ip)