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

11 files changed, 683 insertions, 901 deletions

diff --git a/src/migration-scripts/firewall/10-to-11 b/src/migration-scripts/firewall/10-to-11
index 854d5a558..70a170940 100755..100644
--- a/src/migration-scripts/firewall/10-to-11
+++ b/src/migration-scripts/firewall/10-to-11
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023-2024 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/>.
 
 # T5160: Firewall re-writing
 
@@ -37,171 +36,152 @@
     # set firewall [ipv4 | ipv6] input filter rule <5,10,15,...> action jump
     # set firewall [ipv4 | ipv6] input filter rule <5,10,15,...> jump-target <name>
 
-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()
-
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-### Migration of state policies
-if config.exists(base + ['state-policy']):
-    for state in config.list_nodes(base + ['state-policy']):
-        action = config.return_value(base + ['state-policy', state, 'action'])
-        config.set(base + ['global-options', 'state-policy', state, 'action'], value=action)
-        if config.exists(base + ['state-policy', state, 'log']):
-            config.set(base + ['global-options', 'state-policy', state, 'log'], value='enable')
-    config.delete(base + ['state-policy'])
-
-## migration of global options:
-for option in ['all-ping', 'broadcast-ping', 'config-trap', 'ip-src-route', 'ipv6-receive-redirects', 'ipv6-src-route', 'log-martians',
-                'receive-redirects', 'resolver-cache', 'resolver-internal', 'send-redirects', 'source-validation', 'syn-cookies', 'twa-hazards-protection']:
-    if config.exists(base + [option]):
-        if option != 'config-trap':
-            val = config.return_value(base + [option])
-            config.set(base + ['global-options', option], value=val)
-        config.delete(base + [option])
-
-### Migration of firewall name and ipv6-name
-### Also migrate legacy 'accept' behaviour
-if config.exists(base + ['name']):
-    config.set(['firewall', 'ipv4', 'name'])
-    config.set_tag(['firewall', 'ipv4', 'name'])
-
-    for ipv4name in config.list_nodes(base + ['name']):
-        config.copy(base + ['name', ipv4name], base + ['ipv4', 'name', ipv4name])
-
-        if config.exists(base + ['ipv4', 'name', ipv4name, 'default-action']):
-            action = config.return_value(base + ['ipv4', 'name', ipv4name, 'default-action'])
-
-            if action == 'accept':
-                config.set(base + ['ipv4', 'name', ipv4name, 'default-action'], value='return')
-
-        if config.exists(base + ['ipv4', 'name', ipv4name, 'rule']):
-            for rule_id in config.list_nodes(base + ['ipv4', 'name', ipv4name, 'rule']):
-                action = config.return_value(base + ['ipv4', 'name', ipv4name, 'rule', rule_id, 'action'])
+
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    ### Migration of state policies
+    if config.exists(base + ['state-policy']):
+        for state in config.list_nodes(base + ['state-policy']):
+            action = config.return_value(base + ['state-policy', state, 'action'])
+            config.set(base + ['global-options', 'state-policy', state, 'action'], value=action)
+            if config.exists(base + ['state-policy', state, 'log']):
+                config.set(base + ['global-options', 'state-policy', state, 'log'], value='enable')
+        config.delete(base + ['state-policy'])
+
+    ## migration of global options:
+    for option in ['all-ping', 'broadcast-ping', 'config-trap', 'ip-src-route', 'ipv6-receive-redirects', 'ipv6-src-route', 'log-martians',
+                    'receive-redirects', 'resolver-cache', 'resolver-internal', 'send-redirects', 'source-validation', 'syn-cookies', 'twa-hazards-protection']:
+        if config.exists(base + [option]):
+            if option != 'config-trap':
+                val = config.return_value(base + [option])
+                config.set(base + ['global-options', option], value=val)
+            config.delete(base + [option])
+
+    ### Migration of firewall name and ipv6-name
+    ### Also migrate legacy 'accept' behaviour
+    if config.exists(base + ['name']):
+        config.set(['firewall', 'ipv4', 'name'])
+        config.set_tag(['firewall', 'ipv4', 'name'])
+
+        for ipv4name in config.list_nodes(base + ['name']):
+            config.copy(base + ['name', ipv4name], base + ['ipv4', 'name', ipv4name])
+
+            if config.exists(base + ['ipv4', 'name', ipv4name, 'default-action']):
+                action = config.return_value(base + ['ipv4', 'name', ipv4name, 'default-action'])
 
                 if action == 'accept':
-                    config.set(base + ['ipv4', 'name', ipv4name, 'rule', rule_id, 'action'], value='return')
+                    config.set(base + ['ipv4', 'name', ipv4name, 'default-action'], value='return')
 
-    config.delete(base + ['name'])
+            if config.exists(base + ['ipv4', 'name', ipv4name, 'rule']):
+                for rule_id in config.list_nodes(base + ['ipv4', 'name', ipv4name, 'rule']):
+                    action = config.return_value(base + ['ipv4', 'name', ipv4name, 'rule', rule_id, 'action'])
 
-if config.exists(base + ['ipv6-name']):
-    config.set(['firewall', 'ipv6', 'name'])
-    config.set_tag(['firewall', 'ipv6', 'name'])
+                    if action == 'accept':
+                        config.set(base + ['ipv4', 'name', ipv4name, 'rule', rule_id, 'action'], value='return')
 
-    for ipv6name in config.list_nodes(base + ['ipv6-name']):
-        config.copy(base + ['ipv6-name', ipv6name], base + ['ipv6', 'name', ipv6name])
+        config.delete(base + ['name'])
 
-        if config.exists(base + ['ipv6', 'name', ipv6name, 'default-action']):
-            action = config.return_value(base + ['ipv6', 'name', ipv6name, 'default-action'])
+    if config.exists(base + ['ipv6-name']):
+        config.set(['firewall', 'ipv6', 'name'])
+        config.set_tag(['firewall', 'ipv6', 'name'])
 
-            if action == 'accept':
-                config.set(base + ['ipv6', 'name', ipv6name, 'default-action'], value='return')
+        for ipv6name in config.list_nodes(base + ['ipv6-name']):
+            config.copy(base + ['ipv6-name', ipv6name], base + ['ipv6', 'name', ipv6name])
 
-        if config.exists(base + ['ipv6', 'name', ipv6name, 'rule']):
-            for rule_id in config.list_nodes(base + ['ipv6', 'name', ipv6name, 'rule']):
-                action = config.return_value(base + ['ipv6', 'name', ipv6name, 'rule', rule_id, 'action'])
+            if config.exists(base + ['ipv6', 'name', ipv6name, 'default-action']):
+                action = config.return_value(base + ['ipv6', 'name', ipv6name, 'default-action'])
 
                 if action == 'accept':
-                    config.set(base + ['ipv6', 'name', ipv6name, 'rule', rule_id, 'action'], value='return')
-
-    config.delete(base + ['ipv6-name'])
-
-### Migration of firewall interface
-if config.exists(base + ['interface']):
-    fwd_ipv4_rule = 5
-    inp_ipv4_rule = 5
-    fwd_ipv6_rule = 5
-    inp_ipv6_rule = 5
-    for direction in ['in', 'out', 'local']:
-        for iface in config.list_nodes(base + ['interface']):
-            if config.exists(base + ['interface', iface, direction]):
-                if config.exists(base + ['interface', iface, direction, 'name']):
-                    target = config.return_value(base + ['interface', iface, direction, 'name'])
-                    if direction == 'in':
-                        # Add default-action== accept for compatibility reasons:
-                        config.set(base + ['ipv4', 'forward', 'filter', 'default-action'], value='accept')
-                        new_base = base + ['ipv4', 'forward', 'filter', 'rule']
-                        config.set(new_base)
-                        config.set_tag(new_base)
-                        config.set(new_base + [fwd_ipv4_rule, 'inbound-interface', 'interface-name'], value=iface)
-                        config.set(new_base + [fwd_ipv4_rule, 'action'], value='jump')
-                        config.set(new_base + [fwd_ipv4_rule, 'jump-target'], value=target)
-                        fwd_ipv4_rule = fwd_ipv4_rule + 5
-                    elif direction == 'out':
-                        # Add default-action== accept for compatibility reasons:
-                        config.set(base + ['ipv4', 'forward', 'filter', 'default-action'], value='accept')
-                        new_base = base + ['ipv4', 'forward', 'filter', 'rule']
-                        config.set(new_base)
-                        config.set_tag(new_base)
-                        config.set(new_base + [fwd_ipv4_rule, 'outbound-interface', 'interface-name'], value=iface)
-                        config.set(new_base + [fwd_ipv4_rule, 'action'], value='jump')
-                        config.set(new_base + [fwd_ipv4_rule, 'jump-target'], value=target)
-                        fwd_ipv4_rule = fwd_ipv4_rule + 5
-                    else:
-                        # Add default-action== accept for compatibility reasons:
-                        config.set(base + ['ipv4', 'input', 'filter', 'default-action'], value='accept')
-                        new_base = base + ['ipv4', 'input', 'filter', 'rule']
-                        config.set(new_base)
-                        config.set_tag(new_base)
-                        config.set(new_base + [inp_ipv4_rule, 'inbound-interface', 'interface-name'], value=iface)
-                        config.set(new_base + [inp_ipv4_rule, 'action'], value='jump')
-                        config.set(new_base + [inp_ipv4_rule, 'jump-target'], value=target)
-                        inp_ipv4_rule = inp_ipv4_rule + 5
-
-                if config.exists(base + ['interface', iface, direction, 'ipv6-name']):
-                    target = config.return_value(base + ['interface', iface, direction, 'ipv6-name'])
-                    if direction == 'in':
-                        # Add default-action== accept for compatibility reasons:
-                        config.set(base + ['ipv6', 'forward', 'filter', 'default-action'], value='accept')
-                        new_base = base + ['ipv6', 'forward', 'filter', 'rule']
-                        config.set(new_base)
-                        config.set_tag(new_base)
-                        config.set(new_base + [fwd_ipv6_rule, 'inbound-interface', 'interface-name'], value=iface)
-                        config.set(new_base + [fwd_ipv6_rule, 'action'], value='jump')
-                        config.set(new_base + [fwd_ipv6_rule, 'jump-target'], value=target)
-                        fwd_ipv6_rule = fwd_ipv6_rule + 5
-                    elif direction == 'out':
-                        # Add default-action== accept for compatibility reasons:
-                        config.set(base + ['ipv6', 'forward', 'filter', 'default-action'], value='accept')
-                        new_base = base + ['ipv6', 'forward', 'filter', 'rule']
-                        config.set(new_base)
-                        config.set_tag(new_base)
-                        config.set(new_base + [fwd_ipv6_rule, 'outbound-interface', 'interface-name'], value=iface)
-                        config.set(new_base + [fwd_ipv6_rule, 'action'], value='jump')
-                        config.set(new_base + [fwd_ipv6_rule, 'jump-target'], value=target)
-                        fwd_ipv6_rule = fwd_ipv6_rule + 5
-                    else:
-                        new_base = base + ['ipv6', 'input', 'filter', 'rule']
-                        # Add default-action== accept for compatibility reasons:
-                        config.set(base + ['ipv6', 'input', 'filter', 'default-action'], value='accept')
-                        config.set(new_base)
-                        config.set_tag(new_base)
-                        config.set(new_base + [inp_ipv6_rule, 'inbound-interface', 'interface-name'], value=iface)
-                        config.set(new_base + [inp_ipv6_rule, 'action'], value='jump')
-                        config.set(new_base + [inp_ipv6_rule, 'jump-target'], value=target)
-                        inp_ipv6_rule = inp_ipv6_rule + 5
-
-    config.delete(base + ['interface'])
-
-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)
+                    config.set(base + ['ipv6', 'name', ipv6name, 'default-action'], value='return')
+
+            if config.exists(base + ['ipv6', 'name', ipv6name, 'rule']):
+                for rule_id in config.list_nodes(base + ['ipv6', 'name', ipv6name, 'rule']):
+                    action = config.return_value(base + ['ipv6', 'name', ipv6name, 'rule', rule_id, 'action'])
+
+                    if action == 'accept':
+                        config.set(base + ['ipv6', 'name', ipv6name, 'rule', rule_id, 'action'], value='return')
+
+        config.delete(base + ['ipv6-name'])
+
+    ### Migration of firewall interface
+    if config.exists(base + ['interface']):
+        fwd_ipv4_rule = 5
+        inp_ipv4_rule = 5
+        fwd_ipv6_rule = 5
+        inp_ipv6_rule = 5
+        for direction in ['in', 'out', 'local']:
+            for iface in config.list_nodes(base + ['interface']):
+                if config.exists(base + ['interface', iface, direction]):
+                    if config.exists(base + ['interface', iface, direction, 'name']):
+                        target = config.return_value(base + ['interface', iface, direction, 'name'])
+                        if direction == 'in':
+                            # Add default-action== accept for compatibility reasons:
+                            config.set(base + ['ipv4', 'forward', 'filter', 'default-action'], value='accept')
+                            new_base = base + ['ipv4', 'forward', 'filter', 'rule']
+                            config.set(new_base)
+                            config.set_tag(new_base)
+                            config.set(new_base + [fwd_ipv4_rule, 'inbound-interface', 'interface-name'], value=iface)
+                            config.set(new_base + [fwd_ipv4_rule, 'action'], value='jump')
+                            config.set(new_base + [fwd_ipv4_rule, 'jump-target'], value=target)
+                            fwd_ipv4_rule = fwd_ipv4_rule + 5
+                        elif direction == 'out':
+                            # Add default-action== accept for compatibility reasons:
+                            config.set(base + ['ipv4', 'forward', 'filter', 'default-action'], value='accept')
+                            new_base = base + ['ipv4', 'forward', 'filter', 'rule']
+                            config.set(new_base)
+                            config.set_tag(new_base)
+                            config.set(new_base + [fwd_ipv4_rule, 'outbound-interface', 'interface-name'], value=iface)
+                            config.set(new_base + [fwd_ipv4_rule, 'action'], value='jump')
+                            config.set(new_base + [fwd_ipv4_rule, 'jump-target'], value=target)
+                            fwd_ipv4_rule = fwd_ipv4_rule + 5
+                        else:
+                            # Add default-action== accept for compatibility reasons:
+                            config.set(base + ['ipv4', 'input', 'filter', 'default-action'], value='accept')
+                            new_base = base + ['ipv4', 'input', 'filter', 'rule']
+                            config.set(new_base)
+                            config.set_tag(new_base)
+                            config.set(new_base + [inp_ipv4_rule, 'inbound-interface', 'interface-name'], value=iface)
+                            config.set(new_base + [inp_ipv4_rule, 'action'], value='jump')
+                            config.set(new_base + [inp_ipv4_rule, 'jump-target'], value=target)
+                            inp_ipv4_rule = inp_ipv4_rule + 5
+
+                    if config.exists(base + ['interface', iface, direction, 'ipv6-name']):
+                        target = config.return_value(base + ['interface', iface, direction, 'ipv6-name'])
+                        if direction == 'in':
+                            # Add default-action== accept for compatibility reasons:
+                            config.set(base + ['ipv6', 'forward', 'filter', 'default-action'], value='accept')
+                            new_base = base + ['ipv6', 'forward', 'filter', 'rule']
+                            config.set(new_base)
+                            config.set_tag(new_base)
+                            config.set(new_base + [fwd_ipv6_rule, 'inbound-interface', 'interface-name'], value=iface)
+                            config.set(new_base + [fwd_ipv6_rule, 'action'], value='jump')
+                            config.set(new_base + [fwd_ipv6_rule, 'jump-target'], value=target)
+                            fwd_ipv6_rule = fwd_ipv6_rule + 5
+                        elif direction == 'out':
+                            # Add default-action== accept for compatibility reasons:
+                            config.set(base + ['ipv6', 'forward', 'filter', 'default-action'], value='accept')
+                            new_base = base + ['ipv6', 'forward', 'filter', 'rule']
+                            config.set(new_base)
+                            config.set_tag(new_base)
+                            config.set(new_base + [fwd_ipv6_rule, 'outbound-interface', 'interface-name'], value=iface)
+                            config.set(new_base + [fwd_ipv6_rule, 'action'], value='jump')
+                            config.set(new_base + [fwd_ipv6_rule, 'jump-target'], value=target)
+                            fwd_ipv6_rule = fwd_ipv6_rule + 5
+                        else:
+                            new_base = base + ['ipv6', 'input', 'filter', 'rule']
+                            # Add default-action== accept for compatibility reasons:
+                            config.set(base + ['ipv6', 'input', 'filter', 'default-action'], value='accept')
+                            config.set(new_base)
+                            config.set_tag(new_base)
+                            config.set(new_base + [inp_ipv6_rule, 'inbound-interface', 'interface-name'], value=iface)
+                            config.set(new_base + [inp_ipv6_rule, 'action'], value='jump')
+                            config.set(new_base + [inp_ipv6_rule, 'jump-target'], value=target)
+                            inp_ipv6_rule = inp_ipv6_rule + 5
+
+        config.delete(base + ['interface'])
diff --git a/src/migration-scripts/firewall/11-to-12 b/src/migration-scripts/firewall/11-to-12
index f9122e74c..80a74cca9 100755..100644
--- a/src/migration-scripts/firewall/11-to-12
+++ b/src/migration-scripts/firewall/11-to-12
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023-2024 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/>.
 
 # T5681: Firewall re-writing. Simplify cli when mathcing interface
 # From
@@ -22,50 +21,31 @@
     # set firewall ... rule <rule> [inbound-interface | outboubd-interface] name <iface>
     # set firewall ... rule <rule> [inbound-interface | outboubd-interface] group <iface_group>
 
-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()
-
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-## Migration from base chains
-#if config.exists(base + ['interface', iface, direction]):
-for family in ['ipv4', 'ipv6']:
-    if config.exists(base + [family]):
-        for hook in ['forward', 'input', 'output', 'name']:
-            if config.exists(base + [family, hook]):
-                for priority in config.list_nodes(base + [family, hook]):
-                    if config.exists(base + [family, hook, priority, 'rule']):
-                        for rule in config.list_nodes(base + [family, hook, priority, 'rule']):
-                            for direction in ['inbound-interface', 'outbound-interface']:
-                                if config.exists(base + [family, hook, priority, 'rule', rule, direction]):
-                                    if config.exists(base + [family, hook, priority, 'rule', rule, direction, 'interface-name']):
-                                        iface = config.return_value(base + [family, hook, priority, 'rule', rule, direction, 'interface-name'])
-                                        config.set(base + [family, hook, priority, 'rule', rule, direction, 'name'], value=iface)
-                                        config.delete(base + [family, hook, priority, 'rule', rule, direction, 'interface-name'])
-                                    elif config.exists(base + [family, hook, priority, 'rule', rule, direction, 'interface-group']):
-                                        group = config.return_value(base + [family, hook, priority, 'rule', rule, direction, 'interface-group'])
-                                        config.set(base + [family, hook, priority, 'rule', rule, direction, 'group'], value=group)
-                                        config.delete(base + [family, hook, priority, 'rule', rule, direction, 'interface-group'])
 
-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
+
+    ## Migration from base chains
+    #if config.exists(base + ['interface', iface, direction]):
+    for family in ['ipv4', 'ipv6']:
+        if config.exists(base + [family]):
+            for hook in ['forward', 'input', 'output', 'name']:
+                if config.exists(base + [family, hook]):
+                    for priority in config.list_nodes(base + [family, hook]):
+                        if config.exists(base + [family, hook, priority, 'rule']):
+                            for rule in config.list_nodes(base + [family, hook, priority, 'rule']):
+                                for direction in ['inbound-interface', 'outbound-interface']:
+                                    if config.exists(base + [family, hook, priority, 'rule', rule, direction]):
+                                        if config.exists(base + [family, hook, priority, 'rule', rule, direction, 'interface-name']):
+                                            iface = config.return_value(base + [family, hook, priority, 'rule', rule, direction, 'interface-name'])
+                                            config.set(base + [family, hook, priority, 'rule', rule, direction, 'name'], value=iface)
+                                            config.delete(base + [family, hook, priority, 'rule', rule, direction, 'interface-name'])
+                                        elif config.exists(base + [family, hook, priority, 'rule', rule, direction, 'interface-group']):
+                                            group = config.return_value(base + [family, hook, priority, 'rule', rule, direction, 'interface-group'])
+                                            config.set(base + [family, hook, priority, 'rule', rule, direction, 'group'], value=group)
+                                            config.delete(base + [family, hook, priority, 'rule', rule, direction, 'interface-group'])
diff --git a/src/migration-scripts/firewall/12-to-13 b/src/migration-scripts/firewall/12-to-13
index d72ba834d..d7b801cd3 100755..100644
--- a/src/migration-scripts/firewall/12-to-13
+++ b/src/migration-scripts/firewall/12-to-13
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023-2024 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/>.
 
 # T5729: Switch to valueless whenever is possible.
 # From
@@ -25,65 +24,46 @@
     # set firewall ... rule <rule> state <state>
     # Remove command if log=disable or <state>=disable
 
-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()
-
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
 
-# State Policy logs:
-if config.exists(base + ['global-options', 'state-policy']):
-    for state in config.list_nodes(base + ['global-options', 'state-policy']):
-        if config.exists(base + ['global-options', 'state-policy', state, 'log']):
-            log_value = config.return_value(base + ['global-options', 'state-policy', state, 'log'])
-            config.delete(base + ['global-options', 'state-policy', state, 'log'])
-            if log_value == 'enable':
-                config.set(base + ['global-options', 'state-policy', state, 'log'])
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-for family in ['ipv4', 'ipv6', 'bridge']:
-    if config.exists(base + [family]):
-        for hook in ['forward', 'input', 'output', 'name']:
-            if config.exists(base + [family, hook]):
-                for priority in config.list_nodes(base + [family, hook]):
-                    if config.exists(base + [family, hook, priority, 'rule']):
-                        for rule in config.list_nodes(base + [family, hook, priority, 'rule']):
-                            # Log
-                            if config.exists(base + [family, hook, priority, 'rule', rule, 'log']):
-                                log_value = config.return_value(base + [family, hook, priority, 'rule', rule, 'log'])
-                                config.delete(base + [family, hook, priority, 'rule', rule, 'log'])
-                                if log_value == 'enable':
-                                    config.set(base + [family, hook, priority, 'rule', rule, 'log'])
-                            # State
-                            if config.exists(base + [family, hook, priority, 'rule', rule, 'state']):
-                                flag_enable = 'False'
-                                for state in ['established', 'invalid', 'new', 'related']:
-                                    if config.exists(base + [family, hook, priority, 'rule', rule, 'state', state]):
-                                        state_value = config.return_value(base + [family, hook, priority, 'rule', rule, 'state', state])
-                                        config.delete(base + [family, hook, priority, 'rule', rule, 'state', state])
-                                        if state_value == 'enable':
-                                            config.set(base + [family, hook, priority, 'rule', rule, 'state'], value=state, replace=False)
-                                            flag_enable = 'True'
-                                if flag_enable == 'False':
-                                    config.delete(base + [family, hook, priority, 'rule', rule, 'state'])
+    # State Policy logs:
+    if config.exists(base + ['global-options', 'state-policy']):
+        for state in config.list_nodes(base + ['global-options', 'state-policy']):
+            if config.exists(base + ['global-options', 'state-policy', state, 'log']):
+                log_value = config.return_value(base + ['global-options', 'state-policy', state, 'log'])
+                config.delete(base + ['global-options', 'state-policy', state, 'log'])
+                if log_value == 'enable':
+                    config.set(base + ['global-options', 'state-policy', state, 'log'])
 
-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)
+    for family in ['ipv4', 'ipv6', 'bridge']:
+        if config.exists(base + [family]):
+            for hook in ['forward', 'input', 'output', 'name']:
+                if config.exists(base + [family, hook]):
+                    for priority in config.list_nodes(base + [family, hook]):
+                        if config.exists(base + [family, hook, priority, 'rule']):
+                            for rule in config.list_nodes(base + [family, hook, priority, 'rule']):
+                                # Log
+                                if config.exists(base + [family, hook, priority, 'rule', rule, 'log']):
+                                    log_value = config.return_value(base + [family, hook, priority, 'rule', rule, 'log'])
+                                    config.delete(base + [family, hook, priority, 'rule', rule, 'log'])
+                                    if log_value == 'enable':
+                                        config.set(base + [family, hook, priority, 'rule', rule, 'log'])
+                                # State
+                                if config.exists(base + [family, hook, priority, 'rule', rule, 'state']):
+                                    flag_enable = 'False'
+                                    for state in ['established', 'invalid', 'new', 'related']:
+                                        if config.exists(base + [family, hook, priority, 'rule', rule, 'state', state]):
+                                            state_value = config.return_value(base + [family, hook, priority, 'rule', rule, 'state', state])
+                                            config.delete(base + [family, hook, priority, 'rule', rule, 'state', state])
+                                            if state_value == 'enable':
+                                                config.set(base + [family, hook, priority, 'rule', rule, 'state'], value=state, replace=False)
+                                                flag_enable = 'True'
+                                    if flag_enable == 'False':
+                                        config.delete(base + [family, hook, priority, 'rule', rule, 'state'])
diff --git a/src/migration-scripts/firewall/13-to-14 b/src/migration-scripts/firewall/13-to-14
index f45ff0674..723b0aea2 100755..100644
--- a/src/migration-scripts/firewall/13-to-14
+++ b/src/migration-scripts/firewall/13-to-14
@@ -1,18 +1,17 @@
-#!/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/>.
 
 # T5834: Rename 'enable-default-log' to 'default-log'
 # From
@@ -22,38 +21,19 @@
     # set firewall ... filter default-log
     # set firewall ... name <name> default-log
 
-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()
-
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-for family in ['ipv4', 'ipv6', 'bridge']:
-    if config.exists(base + [family]):
-        for hook in ['forward', 'input', 'output', 'name']:
-            if config.exists(base + [family, hook]):
-                for priority in config.list_nodes(base + [family, hook]):
-                    if config.exists(base + [family, hook, priority, 'enable-default-log']):
-                        config.rename(base + [family, hook, priority, 'enable-default-log'], 'default-log')
 
-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 family in ['ipv4', 'ipv6', 'bridge']:
+        if config.exists(base + [family]):
+            for hook in ['forward', 'input', 'output', 'name']:
+                if config.exists(base + [family, hook]):
+                    for priority in config.list_nodes(base + [family, hook]):
+                        if config.exists(base + [family, hook, priority, 'enable-default-log']):
+                            config.rename(base + [family, hook, priority, 'enable-default-log'], 'default-log')
diff --git a/src/migration-scripts/firewall/14-to-15 b/src/migration-scripts/firewall/14-to-15
index 735839365..e4a2aaee4 100755..100644
--- a/src/migration-scripts/firewall/14-to-15
+++ b/src/migration-scripts/firewall/14-to-15
@@ -1,46 +1,25 @@
-#!/usr/bin/env python3
+# Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2022-2024 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/>.
 
 # T5535: Migrate <set system ip disable-directed-broadcast> to <set firewall global-options directed-broadcas [enable|disable]
 
-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)
-
 base = ['firewall']
 
-if config.exists(['system', 'ip', 'disable-directed-broadcast']):
-    config.set(['firewall', 'global-options', 'directed-broadcast'], value='disable')
-    config.delete(['system', 'ip', 'disable-directed-broadcast'])
-
-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)
\ No newline at end of file
+def migrate(config: ConfigTree) -> None:
+    if config.exists(['system', 'ip', 'disable-directed-broadcast']):
+        config.set(['firewall', 'global-options', 'directed-broadcast'], value='disable')
+        config.delete(['system', 'ip', 'disable-directed-broadcast'])
diff --git a/src/migration-scripts/firewall/15-to-16 b/src/migration-scripts/firewall/15-to-16
index 28df1256e..8e28bba6f 100755..100644
--- a/src/migration-scripts/firewall/15-to-16
+++ b/src/migration-scripts/firewall/15-to-16
@@ -18,39 +18,20 @@
     # from: set system conntrack timeout ..
     # to: set firewall global-options timeout ...
 
-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()
-
 firewall_base = ['firewall', 'global-options']
 conntrack_base = ['system', 'conntrack', 'timeout']
-config = ConfigTree(config_file)
-
-if not config.exists(conntrack_base):
-    # Nothing to do
-    exit(0)
 
-for protocol in ['icmp', 'tcp', 'udp', 'other']:
-    if config.exists(conntrack_base + [protocol]):
-        if not config.exists(firewall_base + ['timeout']):
-            config.set(firewall_base + ['timeout'])
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(conntrack_base):
+        # Nothing to do
+        return
 
-        config.copy(conntrack_base + [protocol], firewall_base + ['timeout', protocol])
-        config.delete(conntrack_base + [protocol])
+    for protocol in ['icmp', 'tcp', 'udp', 'other']:
+        if config.exists(conntrack_base + [protocol]):
+            if not config.exists(firewall_base + ['timeout']):
+                config.set(firewall_base + ['timeout'])
 
-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)
+            config.copy(conntrack_base + [protocol], firewall_base + ['timeout', protocol])
+            config.delete(conntrack_base + [protocol])
diff --git a/src/migration-scripts/firewall/5-to-6 b/src/migration-scripts/firewall/5-to-6
index e1eaea7a1..d01684787 100755..100644
--- a/src/migration-scripts/firewall/5-to-6
+++ b/src/migration-scripts/firewall/5-to-6
@@ -1,105 +1,85 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2021 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/>.
 
 # T3090: migrate "firewall options interface <name> adjust-mss" to the
 #        individual interface.
 
-from sys import argv
-from sys import exit
-
 from vyos.configtree import ConfigTree
 from vyos.ifconfig import Section
 
-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()
-
 base = ['firewall', 'options', 'interface']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-for interface in config.list_nodes(base):
-    if config.exists(base + [interface, 'disable']):
-        continue
 
-    if config.exists(base + [interface, 'adjust-mss']):
-        section = Section.section(interface)
-        tmp = config.return_value(base + [interface, 'adjust-mss'])
-
-        vlan = interface.split('.')
-        base_interface_path = ['interfaces', section, vlan[0]]
-
-        if len(vlan) == 1:
-            # Normal interface, no VLAN
-            config.set(base_interface_path + ['ip', 'adjust-mss'], value=tmp)
-        elif len(vlan) == 2:
-            # Regular VIF or VIF-S interface - we need to check the config
-            vif = vlan[1]
-            if config.exists(base_interface_path + ['vif', vif]):
-                config.set(base_interface_path + ['vif', vif, 'ip', 'adjust-mss'], value=tmp)
-            elif config.exists(base_interface_path + ['vif-s', vif]):
-                config.set(base_interface_path + ['vif-s', vif, 'ip', 'adjust-mss'], value=tmp)
-        elif len(vlan) == 3:
-            # VIF-S interface with VIF-C subinterface
-            vif_s = vlan[1]
-            vif_c = vlan[2]
-            config.set(base_interface_path + ['vif-s', vif_s, 'vif-c', vif_c, 'ip', 'adjust-mss'], value=tmp)
-            config.set_tag(base_interface_path + ['vif-s'])
-            config.set_tag(base_interface_path + ['vif-s', vif_s, 'vif-c'])
-
-    if config.exists(base + [interface, 'adjust-mss6']):
-        section = Section.section(interface)
-        tmp = config.return_value(base + [interface, 'adjust-mss6'])
-
-        vlan = interface.split('.')
-        base_interface_path = ['interfaces', section, vlan[0]]
-
-        if len(vlan) == 1:
-            # Normal interface, no VLAN
-            config.set(['interfaces', section, interface, 'ipv6', 'adjust-mss'], value=tmp)
-        elif len(vlan) == 2:
-            # Regular VIF or VIF-S interface - we need to check the config
-            vif = vlan[1]
-            if config.exists(base_interface_path + ['vif', vif]):
-                config.set(base_interface_path + ['vif', vif, 'ipv6', 'adjust-mss'], value=tmp)
-                config.set_tag(base_interface_path + ['vif'])
-            elif config.exists(base_interface_path + ['vif-s', vif]):
-                config.set(base_interface_path + ['vif-s', vif, 'ipv6', 'adjust-mss'], value=tmp)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    for interface in config.list_nodes(base):
+        if config.exists(base + [interface, 'disable']):
+            continue
+
+        if config.exists(base + [interface, 'adjust-mss']):
+            section = Section.section(interface)
+            tmp = config.return_value(base + [interface, 'adjust-mss'])
+
+            vlan = interface.split('.')
+            base_interface_path = ['interfaces', section, vlan[0]]
+
+            if len(vlan) == 1:
+                # Normal interface, no VLAN
+                config.set(base_interface_path + ['ip', 'adjust-mss'], value=tmp)
+            elif len(vlan) == 2:
+                # Regular VIF or VIF-S interface - we need to check the config
+                vif = vlan[1]
+                if config.exists(base_interface_path + ['vif', vif]):
+                    config.set(base_interface_path + ['vif', vif, 'ip', 'adjust-mss'], value=tmp)
+                elif config.exists(base_interface_path + ['vif-s', vif]):
+                    config.set(base_interface_path + ['vif-s', vif, 'ip', 'adjust-mss'], value=tmp)
+            elif len(vlan) == 3:
+                # VIF-S interface with VIF-C subinterface
+                vif_s = vlan[1]
+                vif_c = vlan[2]
+                config.set(base_interface_path + ['vif-s', vif_s, 'vif-c', vif_c, 'ip', 'adjust-mss'], value=tmp)
                 config.set_tag(base_interface_path + ['vif-s'])
-        elif len(vlan) == 3:
-            # VIF-S interface with VIF-C subinterface
-            vif_s = vlan[1]
-            vif_c = vlan[2]
-            config.set(base_interface_path + ['vif-s', vif_s, 'vif-c', vif_c, 'ipv6', 'adjust-mss'], value=tmp)
-            config.set_tag(base_interface_path + ['vif-s'])
-            config.set_tag(base_interface_path + ['vif-s', vif_s, 'vif-c'])
-
-config.delete(['firewall', 'options'])
+                config.set_tag(base_interface_path + ['vif-s', vif_s, 'vif-c'])
+
+        if config.exists(base + [interface, 'adjust-mss6']):
+            section = Section.section(interface)
+            tmp = config.return_value(base + [interface, 'adjust-mss6'])
+
+            vlan = interface.split('.')
+            base_interface_path = ['interfaces', section, vlan[0]]
+
+            if len(vlan) == 1:
+                # Normal interface, no VLAN
+                config.set(['interfaces', section, interface, 'ipv6', 'adjust-mss'], value=tmp)
+            elif len(vlan) == 2:
+                # Regular VIF or VIF-S interface - we need to check the config
+                vif = vlan[1]
+                if config.exists(base_interface_path + ['vif', vif]):
+                    config.set(base_interface_path + ['vif', vif, 'ipv6', 'adjust-mss'], value=tmp)
+                    config.set_tag(base_interface_path + ['vif'])
+                elif config.exists(base_interface_path + ['vif-s', vif]):
+                    config.set(base_interface_path + ['vif-s', vif, 'ipv6', 'adjust-mss'], value=tmp)
+                    config.set_tag(base_interface_path + ['vif-s'])
+            elif len(vlan) == 3:
+                # VIF-S interface with VIF-C subinterface
+                vif_s = vlan[1]
+                vif_c = vlan[2]
+                config.set(base_interface_path + ['vif-s', vif_s, 'vif-c', vif_c, 'ipv6', 'adjust-mss'], value=tmp)
+                config.set_tag(base_interface_path + ['vif-s'])
+                config.set_tag(base_interface_path + ['vif-s', vif_s, 'vif-c'])
 
-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)
+    config.delete(['firewall', 'options'])
diff --git a/src/migration-scripts/firewall/6-to-7 b/src/migration-scripts/firewall/6-to-7
index 938044c6d..1afbc780b 100755..100644
--- a/src/migration-scripts/firewall/6-to-7
+++ b/src/migration-scripts/firewall/6-to-7
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2021-2024 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/>.
 
 # T2199: Remove unavailable nodes due to XML/Python implementation using nftables
 #        monthdays: nftables does not have a monthdays equivalent
@@ -23,28 +22,11 @@
 
 import re
 
-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()
-
 max_len_description = 255
 
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
 
 icmp_remove = ['any']
 icmp_translations = {
@@ -107,216 +89,216 @@ icmpv6_translations = {
     'unknown-option': [4, 2]
 }
 
-v4_found = False
-v6_found = False
 v4_groups = ["address-group", "network-group", "port-group"]
 v6_groups = ["ipv6-address-group", "ipv6-network-group", "port-group"]
-translated_dict = {}
 
-if config.exists(base + ['group']):
-    for group_type in config.list_nodes(base + ['group']):
-        for group_name in config.list_nodes(base + ['group', group_type]):
-            name_description = base + ['group', group_type, group_name, 'description']
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    v4_found = False
+    v6_found = False
+    translated_dict = {}
+
+    if config.exists(base + ['group']):
+        for group_type in config.list_nodes(base + ['group']):
+            for group_name in config.list_nodes(base + ['group', group_type]):
+                name_description = base + ['group', group_type, group_name, 'description']
+                if config.exists(name_description):
+                    tmp = config.return_value(name_description)
+                    config.set(name_description, value=tmp[:max_len_description])
+                if '+' in group_name:
+                    replacement_string = "_"
+                    if group_type in v4_groups and not v4_found:
+                        v4_found = True
+                    if group_type in v6_groups and not v6_found:
+                        v6_found = True
+                    new_group_name = group_name.replace('+', replacement_string)
+                    while config.exists(base + ['group', group_type, new_group_name]):
+                        replacement_string = replacement_string + "_"
+                        new_group_name = group_name.replace('+', replacement_string)
+                    translated_dict[group_name] = new_group_name
+                    config.copy(base + ['group', group_type, group_name], base + ['group', group_type, new_group_name])
+                    config.delete(base + ['group', group_type, group_name])
+
+    if config.exists(base + ['name']):
+        for name in config.list_nodes(base + ['name']):
+            name_description = base + ['name', name, 'description']
             if config.exists(name_description):
                 tmp = config.return_value(name_description)
                 config.set(name_description, value=tmp[:max_len_description])
-            if '+' in group_name:
-                replacement_string = "_"
-                if group_type in v4_groups and not v4_found:
-                    v4_found = True
-                if group_type in v6_groups and not v6_found:
-                    v6_found = True
-                new_group_name = group_name.replace('+', replacement_string)
-                while config.exists(base + ['group', group_type, new_group_name]):
-                    replacement_string = replacement_string + "_"
-                    new_group_name = group_name.replace('+', replacement_string)
-                translated_dict[group_name] = new_group_name
-                config.copy(base + ['group', group_type, group_name], base + ['group', group_type, new_group_name])
-                config.delete(base + ['group', group_type, group_name])
-
-if config.exists(base + ['name']):
-    for name in config.list_nodes(base + ['name']):
-        name_description = base + ['name', name, 'description']
-        if config.exists(name_description):
-            tmp = config.return_value(name_description)
-            config.set(name_description, value=tmp[:max_len_description])
-
-        if not config.exists(base + ['name', name, 'rule']):
-            continue
-
-        for rule in config.list_nodes(base + ['name', name, 'rule']):
-            rule_description = base + ['name', name, 'rule', rule, 'description']
-            if config.exists(rule_description):
-                tmp = config.return_value(rule_description)
-                config.set(rule_description, value=tmp[:max_len_description])
-
-            rule_recent = base + ['name', name, 'rule', rule, 'recent']
-            rule_time = base + ['name', name, 'rule', rule, 'time']
-            rule_tcp_flags = base + ['name', name, 'rule', rule, 'tcp', 'flags']
-            rule_icmp = base + ['name', name, 'rule', rule, 'icmp']
-
-            if config.exists(rule_time + ['monthdays']):
-                config.delete(rule_time + ['monthdays'])
-
-            if config.exists(rule_time + ['utc']):
-                config.delete(rule_time + ['utc'])
-
-            if config.exists(rule_recent + ['time']):
-                tmp = int(config.return_value(rule_recent + ['time']))
-                unit = 'minute'
-                if tmp > 600:
-                    unit = 'hour'
-                elif tmp < 10:
-                    unit = 'second'
-                config.set(rule_recent + ['time'], value=unit)
-
-            if config.exists(rule_tcp_flags):
-                tmp = config.return_value(rule_tcp_flags)
-                config.delete(rule_tcp_flags)
-                for flag in tmp.split(","):
-                    if flag[0] == '!':
-                        config.set(rule_tcp_flags + ['not', flag[1:].lower()])
-                    else:
-                        config.set(rule_tcp_flags + [flag.lower()])
-
-            if config.exists(rule_icmp + ['type-name']):
-                tmp = config.return_value(rule_icmp + ['type-name'])
-                if tmp in icmp_remove:
-                    config.delete(rule_icmp + ['type-name'])
-                elif tmp in icmp_translations:
-                    translate = icmp_translations[tmp]
-                    if isinstance(translate, str):
-                        config.set(rule_icmp + ['type-name'], value=translate)
-                    elif isinstance(translate, list):
+
+            if not config.exists(base + ['name', name, 'rule']):
+                continue
+
+            for rule in config.list_nodes(base + ['name', name, 'rule']):
+                rule_description = base + ['name', name, 'rule', rule, 'description']
+                if config.exists(rule_description):
+                    tmp = config.return_value(rule_description)
+                    config.set(rule_description, value=tmp[:max_len_description])
+
+                rule_recent = base + ['name', name, 'rule', rule, 'recent']
+                rule_time = base + ['name', name, 'rule', rule, 'time']
+                rule_tcp_flags = base + ['name', name, 'rule', rule, 'tcp', 'flags']
+                rule_icmp = base + ['name', name, 'rule', rule, 'icmp']
+
+                if config.exists(rule_time + ['monthdays']):
+                    config.delete(rule_time + ['monthdays'])
+
+                if config.exists(rule_time + ['utc']):
+                    config.delete(rule_time + ['utc'])
+
+                if config.exists(rule_recent + ['time']):
+                    tmp = int(config.return_value(rule_recent + ['time']))
+                    unit = 'minute'
+                    if tmp > 600:
+                        unit = 'hour'
+                    elif tmp < 10:
+                        unit = 'second'
+                    config.set(rule_recent + ['time'], value=unit)
+
+                if config.exists(rule_tcp_flags):
+                    tmp = config.return_value(rule_tcp_flags)
+                    config.delete(rule_tcp_flags)
+                    for flag in tmp.split(","):
+                        if flag[0] == '!':
+                            config.set(rule_tcp_flags + ['not', flag[1:].lower()])
+                        else:
+                            config.set(rule_tcp_flags + [flag.lower()])
+
+                if config.exists(rule_icmp + ['type-name']):
+                    tmp = config.return_value(rule_icmp + ['type-name'])
+                    if tmp in icmp_remove:
                         config.delete(rule_icmp + ['type-name'])
-                        config.set(rule_icmp + ['type'], value=translate[0])
-                        config.set(rule_icmp + ['code'], value=translate[1])
-
-            for direction in ['destination', 'source']:
-                if config.exists(base + ['name', name, 'rule', rule, direction]):
-                    if config.exists(base + ['name', name, 'rule', rule, direction, 'group']) and v4_found:
-                        for group_type in config.list_nodes(base + ['name', name, 'rule', rule, direction, 'group']):
-                            group_name = config.return_value(base + ['name', name, 'rule', rule, direction, 'group', group_type])
-                            if '+' in group_name:
-                                if group_name[0] == "!":
-                                    new_group_name = "!" + translated_dict[group_name[1:]]
-                                else:
-                                    new_group_name = translated_dict[group_name]
-                                config.set(base + ['name', name, 'rule', rule, direction, 'group', group_type], value=new_group_name)
-
-                    pg_base = base + ['name', name, 'rule', rule, direction, 'group', 'port-group']
-                    proto_base = base + ['name', name, 'rule', rule, 'protocol']
-                    if config.exists(pg_base) and not config.exists(proto_base):
-                        config.set(proto_base, value='tcp_udp')
-
-        if '+' in name:
-            replacement_string = "_"
-            new_name = name.replace('+', replacement_string)
-            while config.exists(base + ['name', new_name]):
-                replacement_string = replacement_string + "_"
+                    elif tmp in icmp_translations:
+                        translate = icmp_translations[tmp]
+                        if isinstance(translate, str):
+                            config.set(rule_icmp + ['type-name'], value=translate)
+                        elif isinstance(translate, list):
+                            config.delete(rule_icmp + ['type-name'])
+                            config.set(rule_icmp + ['type'], value=translate[0])
+                            config.set(rule_icmp + ['code'], value=translate[1])
+
+                for direction in ['destination', 'source']:
+                    if config.exists(base + ['name', name, 'rule', rule, direction]):
+                        if config.exists(base + ['name', name, 'rule', rule, direction, 'group']) and v4_found:
+                            for group_type in config.list_nodes(base + ['name', name, 'rule', rule, direction, 'group']):
+                                group_name = config.return_value(base + ['name', name, 'rule', rule, direction, 'group', group_type])
+                                if '+' in group_name:
+                                    if group_name[0] == "!":
+                                        new_group_name = "!" + translated_dict[group_name[1:]]
+                                    else:
+                                        new_group_name = translated_dict[group_name]
+                                    config.set(base + ['name', name, 'rule', rule, direction, 'group', group_type], value=new_group_name)
+
+                        pg_base = base + ['name', name, 'rule', rule, direction, 'group', 'port-group']
+                        proto_base = base + ['name', name, 'rule', rule, 'protocol']
+                        if config.exists(pg_base) and not config.exists(proto_base):
+                            config.set(proto_base, value='tcp_udp')
+
+            if '+' in name:
+                replacement_string = "_"
                 new_name = name.replace('+', replacement_string)
-            config.copy(base + ['name', name], base + ['name', new_name])
-            config.delete(base + ['name', name])
-
-if config.exists(base + ['ipv6-name']):
-    for name in config.list_nodes(base + ['ipv6-name']):
-        name_description = base + ['ipv6-name', name, 'description']
-        if config.exists(name_description):
-            tmp = config.return_value(name_description)
-            config.set(name_description, value=tmp[:max_len_description])
-
-        if not config.exists(base + ['ipv6-name', name, 'rule']):
-            continue
-
-        for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
-            rule_description = base + ['ipv6-name', name, 'rule', rule, 'description']
-            if config.exists(rule_description):
-                tmp = config.return_value(rule_description)
-                config.set(rule_description, value=tmp[:max_len_description])
-
-            rule_recent = base + ['ipv6-name', name, 'rule', rule, 'recent']
-            rule_time = base + ['ipv6-name', name, 'rule', rule, 'time']
-            rule_tcp_flags = base + ['ipv6-name', name, 'rule', rule, 'tcp', 'flags']
-            rule_icmp = base + ['ipv6-name', name, 'rule', rule, 'icmpv6']
-
-            if config.exists(rule_time + ['monthdays']):
-                config.delete(rule_time + ['monthdays'])
-
-            if config.exists(rule_time + ['utc']):
-                config.delete(rule_time + ['utc'])
-
-            if config.exists(rule_recent + ['time']):
-                tmp = int(config.return_value(rule_recent + ['time']))
-                unit = 'minute'
-                if tmp > 600:
-                    unit = 'hour'
-                elif tmp < 10:
-                    unit = 'second'
-                config.set(rule_recent + ['time'], value=unit)
-
-            if config.exists(rule_tcp_flags):
-                tmp = config.return_value(rule_tcp_flags)
-                config.delete(rule_tcp_flags)
-                for flag in tmp.split(","):
-                    if flag[0] == '!':
-                        config.set(rule_tcp_flags + ['not', flag[1:].lower()])
-                    else:
-                        config.set(rule_tcp_flags + [flag.lower()])
-
-            if config.exists(base + ['ipv6-name', name, 'rule', rule, 'protocol']):
-                tmp = config.return_value(base + ['ipv6-name', name, 'rule', rule, 'protocol'])
-                if tmp == 'icmpv6':
-                    config.set(base + ['ipv6-name', name, 'rule', rule, 'protocol'], value='ipv6-icmp')
-
-            if config.exists(rule_icmp + ['type']):
-                tmp = config.return_value(rule_icmp + ['type'])
-                type_code_match = re.match(r'^(\d+)(?:/(\d+))?$', tmp)
-
-                if type_code_match:
-                    config.set(rule_icmp + ['type'], value=type_code_match[1])
-                    if type_code_match[2]:
-                        config.set(rule_icmp + ['code'], value=type_code_match[2])
-                elif tmp in icmpv6_remove:
-                    config.delete(rule_icmp + ['type'])
-                elif tmp in icmpv6_translations:
-                    translate = icmpv6_translations[tmp]
-                    if isinstance(translate, str):
+                while config.exists(base + ['name', new_name]):
+                    replacement_string = replacement_string + "_"
+                    new_name = name.replace('+', replacement_string)
+                config.copy(base + ['name', name], base + ['name', new_name])
+                config.delete(base + ['name', name])
+
+    if config.exists(base + ['ipv6-name']):
+        for name in config.list_nodes(base + ['ipv6-name']):
+            name_description = base + ['ipv6-name', name, 'description']
+            if config.exists(name_description):
+                tmp = config.return_value(name_description)
+                config.set(name_description, value=tmp[:max_len_description])
+
+            if not config.exists(base + ['ipv6-name', name, 'rule']):
+                continue
+
+            for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
+                rule_description = base + ['ipv6-name', name, 'rule', rule, 'description']
+                if config.exists(rule_description):
+                    tmp = config.return_value(rule_description)
+                    config.set(rule_description, value=tmp[:max_len_description])
+
+                rule_recent = base + ['ipv6-name', name, 'rule', rule, 'recent']
+                rule_time = base + ['ipv6-name', name, 'rule', rule, 'time']
+                rule_tcp_flags = base + ['ipv6-name', name, 'rule', rule, 'tcp', 'flags']
+                rule_icmp = base + ['ipv6-name', name, 'rule', rule, 'icmpv6']
+
+                if config.exists(rule_time + ['monthdays']):
+                    config.delete(rule_time + ['monthdays'])
+
+                if config.exists(rule_time + ['utc']):
+                    config.delete(rule_time + ['utc'])
+
+                if config.exists(rule_recent + ['time']):
+                    tmp = int(config.return_value(rule_recent + ['time']))
+                    unit = 'minute'
+                    if tmp > 600:
+                        unit = 'hour'
+                    elif tmp < 10:
+                        unit = 'second'
+                    config.set(rule_recent + ['time'], value=unit)
+
+                if config.exists(rule_tcp_flags):
+                    tmp = config.return_value(rule_tcp_flags)
+                    config.delete(rule_tcp_flags)
+                    for flag in tmp.split(","):
+                        if flag[0] == '!':
+                            config.set(rule_tcp_flags + ['not', flag[1:].lower()])
+                        else:
+                            config.set(rule_tcp_flags + [flag.lower()])
+
+                if config.exists(base + ['ipv6-name', name, 'rule', rule, 'protocol']):
+                    tmp = config.return_value(base + ['ipv6-name', name, 'rule', rule, 'protocol'])
+                    if tmp == 'icmpv6':
+                        config.set(base + ['ipv6-name', name, 'rule', rule, 'protocol'], value='ipv6-icmp')
+
+                if config.exists(rule_icmp + ['type']):
+                    tmp = config.return_value(rule_icmp + ['type'])
+                    type_code_match = re.match(r'^(\d+)(?:/(\d+))?$', tmp)
+
+                    if type_code_match:
+                        config.set(rule_icmp + ['type'], value=type_code_match[1])
+                        if type_code_match[2]:
+                            config.set(rule_icmp + ['code'], value=type_code_match[2])
+                    elif tmp in icmpv6_remove:
                         config.delete(rule_icmp + ['type'])
-                        config.set(rule_icmp + ['type-name'], value=translate)
-                    elif isinstance(translate, list):
-                        config.set(rule_icmp + ['type'], value=translate[0])
-                        config.set(rule_icmp + ['code'], value=translate[1])
-                else:
-                    config.rename(rule_icmp + ['type'], 'type-name')
-
-            for direction in ['destination', 'source']:
-                if config.exists(base + ['ipv6-name', name, 'rule', rule, direction]):
-                    if config.exists(base + ['ipv6-name', name, 'rule', rule, direction, 'group']) and v6_found:
-                        for group_type in config.list_nodes(base + ['ipv6-name', name, 'rule', rule, direction, 'group']):
-                            group_name = config.return_value(base + ['ipv6-name', name, 'rule', rule, direction, 'group', group_type])
-                            if '+' in group_name:
-                                if group_name[0] == "!":
-                                    new_group_name = "!" + translated_dict[group_name[1:]]
-                                else:
-                                    new_group_name = translated_dict[group_name]
-                                config.set(base + ['ipv6-name', name, 'rule', rule, direction, 'group', group_type], value=new_group_name)
-
-                    pg_base = base + ['ipv6-name', name, 'rule', rule, direction, 'group', 'port-group']
-                    proto_base = base + ['ipv6-name', name, 'rule', rule, 'protocol']
-                    if config.exists(pg_base) and not config.exists(proto_base):
-                        config.set(proto_base, value='tcp_udp')
-
-        if '+' in name:
-            replacement_string = "_"
-            new_name = name.replace('+', replacement_string)
-            while config.exists(base + ['ipv6-name', new_name]):
-                replacement_string = replacement_string + "_"
+                    elif tmp in icmpv6_translations:
+                        translate = icmpv6_translations[tmp]
+                        if isinstance(translate, str):
+                            config.delete(rule_icmp + ['type'])
+                            config.set(rule_icmp + ['type-name'], value=translate)
+                        elif isinstance(translate, list):
+                            config.set(rule_icmp + ['type'], value=translate[0])
+                            config.set(rule_icmp + ['code'], value=translate[1])
+                    else:
+                        config.rename(rule_icmp + ['type'], 'type-name')
+
+                for direction in ['destination', 'source']:
+                    if config.exists(base + ['ipv6-name', name, 'rule', rule, direction]):
+                        if config.exists(base + ['ipv6-name', name, 'rule', rule, direction, 'group']) and v6_found:
+                            for group_type in config.list_nodes(base + ['ipv6-name', name, 'rule', rule, direction, 'group']):
+                                group_name = config.return_value(base + ['ipv6-name', name, 'rule', rule, direction, 'group', group_type])
+                                if '+' in group_name:
+                                    if group_name[0] == "!":
+                                        new_group_name = "!" + translated_dict[group_name[1:]]
+                                    else:
+                                        new_group_name = translated_dict[group_name]
+                                    config.set(base + ['ipv6-name', name, 'rule', rule, direction, 'group', group_type], value=new_group_name)
+
+                        pg_base = base + ['ipv6-name', name, 'rule', rule, direction, 'group', 'port-group']
+                        proto_base = base + ['ipv6-name', name, 'rule', rule, 'protocol']
+                        if config.exists(pg_base) and not config.exists(proto_base):
+                            config.set(proto_base, value='tcp_udp')
+
+            if '+' in name:
+                replacement_string = "_"
                 new_name = name.replace('+', replacement_string)
-            config.copy(base + ['ipv6-name', name], base + ['ipv6-name', new_name])
-            config.delete(base + ['ipv6-name', name])
-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)
+                while config.exists(base + ['ipv6-name', new_name]):
+                    replacement_string = replacement_string + "_"
+                    new_name = name.replace('+', replacement_string)
+                config.copy(base + ['ipv6-name', name], base + ['ipv6-name', new_name])
+                config.delete(base + ['ipv6-name', name])
diff --git a/src/migration-scripts/firewall/7-to-8 b/src/migration-scripts/firewall/7-to-8
index bbaba113a..f46994ce2 100755..100644
--- a/src/migration-scripts/firewall/7-to-8
+++ b/src/migration-scripts/firewall/7-to-8
@@ -1,43 +1,25 @@
-#!/usr/bin/env python3
+# Copyright 2022-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2022-2024 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/>.
 
 # T2199: Migrate interface firewall nodes to firewall interfaces <ifname> <direction> name/ipv6-name <name>
 # T2199: Migrate zone-policy to firewall node
 
-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()
-
 base = ['firewall']
 zone_base = ['zone-policy']
-config = ConfigTree(config_file)
-
-if not config.exists(base) and not config.exists(zone_base):
-    # Nothing to do
-    exit(0)
 
 def migrate_interface(config, iftype, ifname, vif=None, vifs=None, vifc=None):
     if_path = ['interfaces', iftype, ifname]
@@ -63,33 +45,31 @@ def migrate_interface(config, iftype, ifname, vif=None, vifs=None, vifc=None):
     config.copy(if_path + ['firewall'], ['firewall', 'interface', ifname_full])
     config.delete(if_path + ['firewall'])
 
-for iftype in config.list_nodes(['interfaces']):
-    for ifname in config.list_nodes(['interfaces', iftype]):
-        migrate_interface(config, iftype, ifname)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base) and not config.exists(zone_base):
+        # Nothing to do
+        return
 
-        if config.exists(['interfaces', iftype, ifname, 'vif']):
-            for vif in config.list_nodes(['interfaces', iftype, ifname, 'vif']):
-                migrate_interface(config, iftype, ifname, vif=vif)
+    for iftype in config.list_nodes(['interfaces']):
+        for ifname in config.list_nodes(['interfaces', iftype]):
+            migrate_interface(config, iftype, ifname)
 
-        if config.exists(['interfaces', iftype, ifname, 'vif-s']):
-            for vifs in config.list_nodes(['interfaces', iftype, ifname, 'vif-s']):
-                migrate_interface(config, iftype, ifname, vifs=vifs)
+            if config.exists(['interfaces', iftype, ifname, 'vif']):
+                for vif in config.list_nodes(['interfaces', iftype, ifname, 'vif']):
+                    migrate_interface(config, iftype, ifname, vif=vif)
 
-                if config.exists(['interfaces', iftype, ifname, 'vif-s', vifs, 'vif-c']):
-                    for vifc in config.list_nodes(['interfaces', iftype, ifname, 'vif-s', vifs, 'vif-c']):
-                        migrate_interface(config, iftype, ifname, vifs=vifs, vifc=vifc)
+            if config.exists(['interfaces', iftype, ifname, 'vif-s']):
+                for vifs in config.list_nodes(['interfaces', iftype, ifname, 'vif-s']):
+                    migrate_interface(config, iftype, ifname, vifs=vifs)
 
-if config.exists(zone_base + ['zone']):
-    config.set(['firewall', 'zone'])
-    config.set_tag(['firewall', 'zone'])
+                    if config.exists(['interfaces', iftype, ifname, 'vif-s', vifs, 'vif-c']):
+                        for vifc in config.list_nodes(['interfaces', iftype, ifname, 'vif-s', vifs, 'vif-c']):
+                            migrate_interface(config, iftype, ifname, vifs=vifs, vifc=vifc)
 
-    for zone in config.list_nodes(zone_base + ['zone']):
-        config.copy(zone_base + ['zone', zone], ['firewall', 'zone', zone])
-    config.delete(zone_base)
+    if config.exists(zone_base + ['zone']):
+        config.set(['firewall', 'zone'])
+        config.set_tag(['firewall', 'zone'])
 
-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)
+        for zone in config.list_nodes(zone_base + ['zone']):
+            config.copy(zone_base + ['zone', zone], ['firewall', 'zone', zone])
+        config.delete(zone_base)
diff --git a/src/migration-scripts/firewall/8-to-9 b/src/migration-scripts/firewall/8-to-9
index 6e019beb2..3c9e84662 100755..100644
--- a/src/migration-scripts/firewall/8-to-9
+++ b/src/migration-scripts/firewall/8-to-9
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2022-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2022-2024 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/>.
 
 # T4780: Add firewall interface group
 #  cli changes from:
@@ -20,69 +19,50 @@
 #  To
 #  set firewall [name | ipv6-name] <name> rule <number> [inbound-interface | outbound-interface]  [interface-name | interface-group] <interface_name | interface_group>
 
-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()
-
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-if config.exists(base + ['name']):
-    for name in config.list_nodes(base + ['name']):
-        if not config.exists(base + ['name', name, 'rule']):
-            continue
-
-        for rule in config.list_nodes(base + ['name', name, 'rule']):
-            rule_iiface = base + ['name', name, 'rule', rule, 'inbound-interface']
-            rule_oiface = base + ['name', name, 'rule', rule, 'outbound-interface']
-
-            if config.exists(rule_iiface):
-                tmp = config.return_value(rule_iiface)
-                config.delete(rule_iiface)
-                config.set(rule_iiface + ['interface-name'], value=tmp)
-
-            if config.exists(rule_oiface):
-                tmp = config.return_value(rule_oiface)
-                config.delete(rule_oiface)
-                config.set(rule_oiface + ['interface-name'], value=tmp)
-
-
-if config.exists(base + ['ipv6-name']):
-    for name in config.list_nodes(base + ['ipv6-name']):
-        if not config.exists(base + ['ipv6-name', name, 'rule']):
-            continue
-
-        for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
-            rule_iiface = base + ['ipv6-name', name, 'rule', rule, 'inbound-interface']
-            rule_oiface = base + ['ipv6-name', name, 'rule', rule, 'outbound-interface']
-
-            if config.exists(rule_iiface):
-                tmp = config.return_value(rule_iiface)
-                config.delete(rule_iiface)
-                config.set(rule_iiface + ['interface-name'], value=tmp)
-
-            if config.exists(rule_oiface):
-                tmp = config.return_value(rule_oiface)
-                config.delete(rule_oiface)
-                config.set(rule_oiface + ['interface-name'], value=tmp)
 
-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
+
+    if config.exists(base + ['name']):
+        for name in config.list_nodes(base + ['name']):
+            if not config.exists(base + ['name', name, 'rule']):
+                continue
+
+            for rule in config.list_nodes(base + ['name', name, 'rule']):
+                rule_iiface = base + ['name', name, 'rule', rule, 'inbound-interface']
+                rule_oiface = base + ['name', name, 'rule', rule, 'outbound-interface']
+
+                if config.exists(rule_iiface):
+                    tmp = config.return_value(rule_iiface)
+                    config.delete(rule_iiface)
+                    config.set(rule_iiface + ['interface-name'], value=tmp)
+
+                if config.exists(rule_oiface):
+                    tmp = config.return_value(rule_oiface)
+                    config.delete(rule_oiface)
+                    config.set(rule_oiface + ['interface-name'], value=tmp)
+
+
+    if config.exists(base + ['ipv6-name']):
+        for name in config.list_nodes(base + ['ipv6-name']):
+            if not config.exists(base + ['ipv6-name', name, 'rule']):
+                continue
+
+            for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
+                rule_iiface = base + ['ipv6-name', name, 'rule', rule, 'inbound-interface']
+                rule_oiface = base + ['ipv6-name', name, 'rule', rule, 'outbound-interface']
+
+                if config.exists(rule_iiface):
+                    tmp = config.return_value(rule_iiface)
+                    config.delete(rule_iiface)
+                    config.set(rule_iiface + ['interface-name'], value=tmp)
+
+                if config.exists(rule_oiface):
+                    tmp = config.return_value(rule_oiface)
+                    config.delete(rule_oiface)
+                    config.set(rule_oiface + ['interface-name'], value=tmp)
diff --git a/src/migration-scripts/firewall/9-to-10 b/src/migration-scripts/firewall/9-to-10
index ce509a731..306a53a86 100755..100644
--- a/src/migration-scripts/firewall/9-to-10
+++ b/src/migration-scripts/firewall/9-to-10
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023-2024 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/>.
 
 # T5050: Log options
 #  cli changes from:
@@ -20,58 +19,39 @@
 #  To
 #  set firewall [name | ipv6-name] <name> rule <number> log-options level <log_level>
 
-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()
-
 base = ['firewall']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-if config.exists(base + ['name']):
-    for name in config.list_nodes(base + ['name']):
-        if not config.exists(base + ['name', name, 'rule']):
-            continue
-
-        for rule in config.list_nodes(base + ['name', name, 'rule']):
-            log_options_base = base + ['name', name, 'rule', rule, 'log-options']
-            rule_log_level = base + ['name', name, 'rule', rule, 'log-level']
-
-            if config.exists(rule_log_level):
-                tmp = config.return_value(rule_log_level)
-                config.delete(rule_log_level)
-                config.set(log_options_base + ['level'], value=tmp)
-
-if config.exists(base + ['ipv6-name']):
-    for name in config.list_nodes(base + ['ipv6-name']):
-        if not config.exists(base + ['ipv6-name', name, 'rule']):
-            continue
-
-        for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
-            log_options_base = base + ['ipv6-name', name, 'rule', rule, 'log-options']
-            rule_log_level = base + ['ipv6-name', name, 'rule', rule, 'log-level']
-
-            if config.exists(rule_log_level):
-                tmp = config.return_value(rule_log_level)
-                config.delete(rule_log_level)
-                config.set(log_options_base + ['level'], value=tmp)
 
-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
+
+    if config.exists(base + ['name']):
+        for name in config.list_nodes(base + ['name']):
+            if not config.exists(base + ['name', name, 'rule']):
+                continue
+
+            for rule in config.list_nodes(base + ['name', name, 'rule']):
+                log_options_base = base + ['name', name, 'rule', rule, 'log-options']
+                rule_log_level = base + ['name', name, 'rule', rule, 'log-level']
+
+                if config.exists(rule_log_level):
+                    tmp = config.return_value(rule_log_level)
+                    config.delete(rule_log_level)
+                    config.set(log_options_base + ['level'], value=tmp)
+
+    if config.exists(base + ['ipv6-name']):
+        for name in config.list_nodes(base + ['ipv6-name']):
+            if not config.exists(base + ['ipv6-name', name, 'rule']):
+                continue
+
+            for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
+                log_options_base = base + ['ipv6-name', name, 'rule', rule, 'log-options']
+                rule_log_level = base + ['ipv6-name', name, 'rule', rule, 'log-level']
+
+                if config.exists(rule_log_level):
+                    tmp = config.return_value(rule_log_level)
+                    config.delete(rule_log_level)
+                    config.set(log_options_base + ['level'], value=tmp)