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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 32 insertions, 50 deletions

diff --git a/src/migration-scripts/dhcp-server/8-to-9 b/src/migration-scripts/dhcp-server/8-to-9
index 151aa6d7b..5843e9fda 100755..100644
--- a/src/migration-scripts/dhcp-server/8-to-9
+++ b/src/migration-scripts/dhcp-server/8-to-9
@@ -1,65 +1,47 @@
-#!/usr/bin/env python3
+# Copyright 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/>.
 
 # T3316:
 # - Adjust hostname to have valid FQDN characters only (underscores aren't allowed anymore)
 # - Rename "service dhcp-server shared-network-name ... static-mapping <hostname> mac-address ..."
 #       to "service dhcp-server shared-network-name ... static-mapping <hostname> mac ..."
 
-import sys
 import re
 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', 'shared-network-name']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    sys.exit(0)
-
-for network in config.list_nodes(base):
-    # Run this for every specified 'subnet'
-    if config.exists(base + [network, 'subnet']):
-        for subnet in config.list_nodes(base + [network, 'subnet']):
-            base_subnet = base + [network, 'subnet', subnet]
-            if config.exists(base_subnet + ['static-mapping']):
-                for hostname in config.list_nodes(base_subnet + ['static-mapping']):
-                    base_mapping = base_subnet + ['static-mapping', hostname]
-
-                    # Rename the 'mac-address' node to 'mac'
-                    if config.exists(base_mapping + ['mac-address']):
-                        config.rename(base_mapping + ['mac-address'], 'mac')
-
-                    # Adjust hostname to have valid FQDN characters only
-                    new_hostname = re.sub(r'[^a-zA-Z0-9-.]', '-', hostname)
-                    if new_hostname != hostname:
-                        config.rename(base_mapping, new_hostname)
 
-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)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    for network in config.list_nodes(base):
+        # Run this for every specified 'subnet'
+        if config.exists(base + [network, 'subnet']):
+            for subnet in config.list_nodes(base + [network, 'subnet']):
+                base_subnet = base + [network, 'subnet', subnet]
+                if config.exists(base_subnet + ['static-mapping']):
+                    for hostname in config.list_nodes(base_subnet + ['static-mapping']):
+                        base_mapping = base_subnet + ['static-mapping', hostname]
+
+                        # Rename the 'mac-address' node to 'mac'
+                        if config.exists(base_mapping + ['mac-address']):
+                            config.rename(base_mapping + ['mac-address'], 'mac')
+
+                        # Adjust hostname to have valid FQDN characters only
+                        new_hostname = re.sub(r'[^a-zA-Z0-9-.]', '-', hostname)
+                        if new_hostname != hostname:
+                            config.rename(base_mapping, new_hostname)