Merge pull request #4050 from jestabro/revise-migration-circinus

T6007: revise migration system

33 files changed, 949 insertions, 1482 deletions

diff --git a/src/migration-scripts/interfaces/0-to-1 b/src/migration-scripts/interfaces/0-to-1
index 25f6842eb..7c135e76e 100755..100644
--- a/src/migration-scripts/interfaces/0-to-1
+++ b/src/migration-scripts/interfaces/0-to-1
@@ -1,11 +1,23 @@
-#!/usr/bin/env python3
+# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# 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 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
+# Lesser General Public License for more details.
+#
+# 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/>.
 
 # Change syntax of bridge interface
 # - move interface based bridge-group to actual bridge (de-nest)
 # - make stp and igmp-snooping nodes valueless
 # https://vyos.dev/T1556
 
-import sys
 from vyos.configtree import ConfigTree
 
 def migrate_bridge(config, tree, intf):
@@ -36,83 +48,66 @@ def migrate_bridge(config, tree, intf):
         config.delete(tree_bridge)
 
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        sys.exit(1)
-
-    file_name = sys.argv[1]
-
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'bridge']
 
     if not config.exists(base):
         # Nothing to do
-        sys.exit(0)
-    else:
-        #
-        # make stp and igmp-snooping nodes valueless
-        #
-        for br in config.list_nodes(base):
-            # STP: check if enabled
-            if config.exists(base + [br, 'stp']):
-                stp_val = config.return_value(base + [br, 'stp'])
-                # STP: delete node with old syntax
-                config.delete(base + [br, 'stp'])
-                # STP: set new node - if enabled
-                if stp_val == "true":
-                    config.set(base + [br, 'stp'], value=None)
-
-            # igmp-snooping: check if enabled
-            if config.exists(base + [br, 'igmp-snooping', 'querier']):
-                igmp_val = config.return_value(base + [br, 'igmp-snooping', 'querier'])
-                # igmp-snooping: delete node with old syntax
-                config.delete(base + [br, 'igmp-snooping', 'querier'])
-                # igmp-snooping: set new node - if enabled
-                if igmp_val == "enable":
-                    config.set(base + [br, 'igmp', 'querier'], value=None)
-
-        #
-        # move interface based bridge-group to actual bridge (de-nest)
-        #
-        bridge_types = ['bonding', 'ethernet', 'l2tpv3', 'openvpn', 'vxlan', 'wireless']
-        for type in bridge_types:
-            if not config.exists(['interfaces', type]):
-                continue
-
-            for interface in config.list_nodes(['interfaces', type]):
-                # check if bridge-group exists
-                bridge_group = ['interfaces', type, interface]
-                if config.exists(bridge_group + ['bridge-group']):
-                    migrate_bridge(config, bridge_group, interface)
-
-                # We also need to migrate VLAN interfaces
-                vlan_base = ['interfaces', type, interface, 'vif']
-                if config.exists(vlan_base):
-                    for vlan in config.list_nodes(vlan_base):
-                        intf = "{}.{}".format(interface, vlan)
-                        migrate_bridge(config, vlan_base + [vlan], intf)
-
-                # And then we have service VLANs (vif-s) interfaces
-                vlan_base = ['interfaces', type, interface, 'vif-s']
-                if config.exists(vlan_base):
-                    for vif_s in config.list_nodes(vlan_base):
-                        intf = "{}.{}".format(interface, vif_s)
-                        migrate_bridge(config, vlan_base + [vif_s], intf)
-
-                        # Every service VLAN can have multiple customer VLANs (vif-c)
-                        vlan_c = ['interfaces', type, interface, 'vif-s', vif_s, 'vif-c']
-                        if config.exists(vlan_c):
-                            for vif_c in config.list_nodes(vlan_c):
-                                intf = "{}.{}.{}".format(interface, vif_s, vif_c)
-                                migrate_bridge(config, vlan_c + [vif_c], intf)
-
-        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))
-            sys.exit(1)
+        return
+
+    #
+    # make stp and igmp-snooping nodes valueless
+    #
+    for br in config.list_nodes(base):
+        # STP: check if enabled
+        if config.exists(base + [br, 'stp']):
+            stp_val = config.return_value(base + [br, 'stp'])
+            # STP: delete node with old syntax
+            config.delete(base + [br, 'stp'])
+            # STP: set new node - if enabled
+            if stp_val == "true":
+                config.set(base + [br, 'stp'], value=None)
+
+        # igmp-snooping: check if enabled
+        if config.exists(base + [br, 'igmp-snooping', 'querier']):
+            igmp_val = config.return_value(base + [br, 'igmp-snooping', 'querier'])
+            # igmp-snooping: delete node with old syntax
+            config.delete(base + [br, 'igmp-snooping', 'querier'])
+            # igmp-snooping: set new node - if enabled
+            if igmp_val == "enable":
+                config.set(base + [br, 'igmp', 'querier'], value=None)
+
+    #
+    # move interface based bridge-group to actual bridge (de-nest)
+    #
+    bridge_types = ['bonding', 'ethernet', 'l2tpv3', 'openvpn', 'vxlan', 'wireless']
+    for type in bridge_types:
+        if not config.exists(['interfaces', type]):
+            continue
+
+        for interface in config.list_nodes(['interfaces', type]):
+            # check if bridge-group exists
+            bridge_group = ['interfaces', type, interface]
+            if config.exists(bridge_group + ['bridge-group']):
+                migrate_bridge(config, bridge_group, interface)
+
+            # We also need to migrate VLAN interfaces
+            vlan_base = ['interfaces', type, interface, 'vif']
+            if config.exists(vlan_base):
+                for vlan in config.list_nodes(vlan_base):
+                    intf = "{}.{}".format(interface, vlan)
+                    migrate_bridge(config, vlan_base + [vlan], intf)
+
+            # And then we have service VLANs (vif-s) interfaces
+            vlan_base = ['interfaces', type, interface, 'vif-s']
+            if config.exists(vlan_base):
+                for vif_s in config.list_nodes(vlan_base):
+                    intf = "{}.{}".format(interface, vif_s)
+                    migrate_bridge(config, vlan_base + [vif_s], intf)
+
+                    # Every service VLAN can have multiple customer VLANs (vif-c)
+                    vlan_c = ['interfaces', type, interface, 'vif-s', vif_s, 'vif-c']
+                    if config.exists(vlan_c):
+                        for vif_c in config.list_nodes(vlan_c):
+                            intf = "{}.{}.{}".format(interface, vif_s, vif_c)
+                            migrate_bridge(config, vlan_c + [vif_c], intf)
diff --git a/src/migration-scripts/interfaces/1-to-2 b/src/migration-scripts/interfaces/1-to-2
index c95623c2b..ebf02b028 100755..100644
--- a/src/migration-scripts/interfaces/1-to-2
+++ b/src/migration-scripts/interfaces/1-to-2
@@ -1,28 +1,31 @@
-#!/usr/bin/env python3
+# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# 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 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
+# Lesser General Public License for more details.
+#
+# 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/>.
 
 # Change syntax of bond interface
 # - move interface based bond-group to actual bond (de-nest)
 # https://vyos.dev/T1614
 
-import sys
 from vyos.configtree import ConfigTree
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
 base = ['interfaces', 'bonding']
 
-if not config.exists(base):
-    # Nothing to do
-    sys.exit(0)
-else:
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
     #
     # move interface based bond-group to actual bond (de-nest)
     #
@@ -54,10 +57,3 @@ else:
                     #
                     # so we simply disable arp_interval by setting it to 0 and miimon will take care about the link
                     config.set(base + [bond, 'arp-monitor', 'interval'], value='0')
-
-    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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/10-to-11 b/src/migration-scripts/interfaces/10-to-11
index cafaa3fa4..8a562f2d0 100755..100644
--- a/src/migration-scripts/interfaces/10-to-11
+++ b/src/migration-scripts/interfaces/10-to-11
@@ -1,41 +1,31 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # rename WWAN (wirelessmodem) serial interface from non persistent ttyUSB2 to
 # a bus like name, e.g. "usb0b1.3p1.3"
 
 import os
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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 = ['interfaces', 'wirelessmodem']
 
-    config = ConfigTree(config_file)
-    base = ['interfaces', 'wirelessmodem']
+def migrate(config: ConfigTree) -> None:
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     for wwan in config.list_nodes(base):
         if config.exists(base + [wwan, 'device']):
@@ -46,10 +36,3 @@ if __name__ == '__main__':
                     device_file = os.path.realpath(os.path.join(root, file))
                     if os.path.basename(device_file) == device:
                         config.set(base + [wwan, 'device'], value=file, replace=True)
-
-    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)
diff --git a/src/migration-scripts/interfaces/11-to-12 b/src/migration-scripts/interfaces/11-to-12
index e9eb7f939..132cecbb7 100755..100644
--- a/src/migration-scripts/interfaces/11-to-12
+++ b/src/migration-scripts/interfaces/11-to-12
@@ -1,37 +1,25 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # - rename 'dhcpv6-options prefix-delegation' from single node to a new tag node
 #   'dhcpv6-options pd 0'
 # - delete 'sla-len' from CLI - value is calculated on demand
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     for type in config.list_nodes(['interfaces']):
         for interface in config.list_nodes(['interfaces', type]):
             # cache current config tree
@@ -49,10 +37,3 @@ if __name__ == '__main__':
                         sla_config = new_base + [pd, 'interface', tmp, 'sla-len']
                         if config.exists(sla_config):
                             config.delete(sla_config)
-
-    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)
diff --git a/src/migration-scripts/interfaces/12-to-13 b/src/migration-scripts/interfaces/12-to-13
index ef1d93903..585deb898 100755..100644
--- a/src/migration-scripts/interfaces/12-to-13
+++ b/src/migration-scripts/interfaces/12-to-13
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # - T2903: Change vif-s ethertype from numeric number to literal
 #   - 0x88a8 -> 802.1ad
@@ -20,20 +19,9 @@
 # - T2905: Change WWAN "ondemand" node to "connect-on-demand" to have identical
 #   CLI nodes for both types of dialer interfaces
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     #
     # T2903
     #
@@ -61,11 +49,3 @@ if __name__ == '__main__':
         for interface in config.list_nodes(wwan_base):
             if config.exists(wwan_base + [interface, 'ondemand']):
                 config.rename(wwan_base + [interface, 'ondemand'], 'connect-on-demand')
-
-    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)
-
diff --git a/src/migration-scripts/interfaces/13-to-14 b/src/migration-scripts/interfaces/13-to-14
index b20d8b4db..45d8e3b5f 100755..100644
--- a/src/migration-scripts/interfaces/13-to-14
+++ b/src/migration-scripts/interfaces/13-to-14
@@ -1,39 +1,29 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # T3043: rename Wireless interface security mode 'both' to 'wpa+wpa2'
 # T3043: move "system wifi-regulatory-domain" to indicidual wireless interface
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'wireless']
+
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     country_code = ''
     cc_cli = ['system', 'wifi-regulatory-domain']
@@ -50,10 +40,3 @@ if __name__ == '__main__':
 
         if country_code:
             config.set(base + [wifi, 'country-code'], value=country_code)
-
-    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)
diff --git a/src/migration-scripts/interfaces/14-to-15 b/src/migration-scripts/interfaces/14-to-15
index e21251f86..d45d59bba 100755..100644
--- a/src/migration-scripts/interfaces/14-to-15
+++ b/src/migration-scripts/interfaces/14-to-15
@@ -1,39 +1,28 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # T3048: remove smp-affinity node from ethernet and use tuned instead
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'ethernet']
 
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     migrate = False
     for interface in config.list_nodes(base):
@@ -47,10 +36,3 @@ if __name__ == '__main__':
 
     if migrate:
         config.set(['system', 'options', 'performance'], value='throughput')
-
-    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)
diff --git a/src/migration-scripts/interfaces/15-to-16 b/src/migration-scripts/interfaces/15-to-16
index ae3441b9f..c9abdb5f8 100755..100644
--- a/src/migration-scripts/interfaces/15-to-16
+++ b/src/migration-scripts/interfaces/15-to-16
@@ -1,48 +1,30 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # remove pppoe "ipv6 enable" option
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'pppoe']
 
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     for interface in config.list_nodes(base):
         ipv6_enable = base + [interface, 'ipv6', 'enable']
         if config.exists(ipv6_enable):
             config.delete(ipv6_enable)
-
-    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)
diff --git a/src/migration-scripts/interfaces/16-to-17 b/src/migration-scripts/interfaces/16-to-17
index 75f160686..7d241ac68 100755..100644
--- a/src/migration-scripts/interfaces/16-to-17
+++ b/src/migration-scripts/interfaces/16-to-17
@@ -1,40 +1,28 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # Command line migration of port mirroring
 # https://vyos.dev/T3089
 
-import sys
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        sys.exit(1)
-
-    file_name = sys.argv[1]
-
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'ethernet']
     if not config.exists(base):
         # Nothing to do
-        sys.exit(0)
+        return
 
     for interface in config.list_nodes(base):
         mirror_old_base = base + [interface, 'mirror']
@@ -43,10 +31,3 @@ if __name__ == '__main__':
             if config.exists(mirror_old_base):
                 config.delete(mirror_old_base)
                 config.set(mirror_old_base + ['ingress'],intf[0])
-
-    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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/17-to-18 b/src/migration-scripts/interfaces/17-to-18
index 51486ac37..f45695a88 100755..100644
--- a/src/migration-scripts/interfaces/17-to-18
+++ b/src/migration-scripts/interfaces/17-to-18
@@ -1,37 +1,25 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # T3043: Move "system wifi-regulatory-domain" to indicidual wireless interface.
 #        Country Code will be migratred from upper to lower case.
 # T3140: Relax ethernet interface offload-options
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     # T3140: Cleanup ethernet offload-options, remove on/off value and use
     # valueless nodes instead.
     eth_base = ['interfaces', 'ethernet']
@@ -62,10 +50,3 @@ if __name__ == '__main__':
             if config.exists(ccode):
                 tmp = config.return_value(ccode)
                 config.set(ccode, value=tmp.lower(), replace=True)
-
-    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)
diff --git a/src/migration-scripts/interfaces/18-to-19 b/src/migration-scripts/interfaces/18-to-19
index c3209f250..ae1a07adb 100755..100644
--- a/src/migration-scripts/interfaces/18-to-19
+++ b/src/migration-scripts/interfaces/18-to-19
@@ -1,24 +1,20 @@
-#!/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/>.
 
 import os
 
-from sys import argv
-from sys import exit
-
 from vyos.configtree import ConfigTree
 
 def replace_nat_interfaces(config, old, new):
@@ -40,21 +36,11 @@ def replace_nat_interfaces(config, old, new):
                     config.set(conf_rule + ['outbound-interface'], value=new)
 
 
-if __name__ == '__main__':
-    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)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'wirelessmodem']
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     new_base = ['interfaces', 'wwan']
     config.set(new_base)
@@ -98,10 +84,3 @@ if __name__ == '__main__':
 
         # the new wwan interface use regular IP addressing
         config.set(new_base + [interface, 'address'], value='dhcp')
-
-    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)
diff --git a/src/migration-scripts/interfaces/19-to-20 b/src/migration-scripts/interfaces/19-to-20
index 05abae898..7ee6302e2 100755..100644
--- a/src/migration-scripts/interfaces/19-to-20
+++ b/src/migration-scripts/interfaces/19-to-20
@@ -1,34 +1,21 @@
-#!/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/>.
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     for type in ['tunnel', 'l2tpv3']:
         base = ['interfaces', type]
         if not config.exists(base):
@@ -52,10 +39,3 @@ if __name__ == '__main__':
             remote_ip_path = base + [interface, 'remote-ip']
             if config.exists(remote_ip_path):
                 config.rename(remote_ip_path, 'remote')
-
-    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)
diff --git a/src/migration-scripts/interfaces/2-to-3 b/src/migration-scripts/interfaces/2-to-3
index 15c3bc8be..695dcbf7a 100755..100644
--- a/src/migration-scripts/interfaces/2-to-3
+++ b/src/migration-scripts/interfaces/2-to-3
@@ -1,28 +1,31 @@
-#!/usr/bin/env python3
+# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# 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 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
+# Lesser General Public License for more details.
+#
+# 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/>.
 
 # Change syntax of openvpn encryption settings
 # - move cipher from encryption to encryption cipher
 # https://vyos.dev/T1704
 
-import sys
 from vyos.configtree import ConfigTree
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
 base = ['interfaces', 'openvpn']
 
-if not config.exists(base):
-    # Nothing to do
-    sys.exit(0)
-else:
+def migrate(config: ConfigTree) -> None:
+
+    if not config.exists(base):
+        # Nothing to do
+        return
     #
     # move cipher from "encryption" to "encryption cipher"
     #
@@ -35,9 +38,3 @@ else:
             config.delete(['interfaces', 'openvpn', intf, 'encryption'])
             # Add new syntax to config
             config.set(['interfaces', 'openvpn', intf, 'encryption', 'cipher'], value=cipher)
-    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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/20-to-21 b/src/migration-scripts/interfaces/20-to-21
index 05a0c7237..0b6895177 100755..100644
--- a/src/migration-scripts/interfaces/20-to-21
+++ b/src/migration-scripts/interfaces/20-to-21
@@ -1,125 +1,107 @@
-#!/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/>.
 
 # T3619: mirror Linux Kernel defaults for ethernet offloading options into VyOS
 #        CLI. See https://vyos.dev/T3619#102254 for all the details.
 # T3787: Remove deprecated UDP fragmentation offloading option
 
-from sys import argv
-
 from vyos.ethtool import Ethtool
 from vyos.configtree import ConfigTree
 from vyos.utils.network import interface_exists
 
-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 = ['interfaces', 'ethernet']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    exit(0)
-
-for ifname in config.list_nodes(base):
-    # Bail out early if interface vanished from system
-    if not interface_exists(ifname):
-        continue
-
-    eth = Ethtool(ifname)
-
-    # If GRO is enabled by the Kernel - we reflect this on the CLI. If GRO is
-    # enabled via CLI but not supported by the NIC - we remove it from the CLI
-    configured = config.exists(base + [ifname, 'offload', 'gro'])
-    enabled, fixed = eth.get_generic_receive_offload()
-    if configured and fixed:
-        config.delete(base + [ifname, 'offload', 'gro'])
-    elif enabled and not fixed:
-        config.set(base + [ifname, 'offload', 'gro'])
-
-    # If GSO is enabled by the Kernel - we reflect this on the CLI. If GSO is
-    # enabled via CLI but not supported by the NIC - we remove it from the CLI
-    configured = config.exists(base + [ifname, 'offload', 'gso'])
-    enabled, fixed = eth.get_generic_segmentation_offload()
-    if configured and fixed:
-        config.delete(base + [ifname, 'offload', 'gso'])
-    elif enabled and not fixed:
-        config.set(base + [ifname, 'offload', 'gso'])
-
-    # If LRO is enabled by the Kernel - we reflect this on the CLI. If LRO is
-    # enabled via CLI but not supported by the NIC - we remove it from the CLI
-    configured = config.exists(base + [ifname, 'offload', 'lro'])
-    enabled, fixed = eth.get_large_receive_offload()
-    if configured and fixed:
-        config.delete(base + [ifname, 'offload', 'lro'])
-    elif enabled and not fixed:
-        config.set(base + [ifname, 'offload', 'lro'])
-
-    # If SG is enabled by the Kernel - we reflect this on the CLI. If SG is
-    # enabled via CLI but not supported by the NIC - we remove it from the CLI
-    configured = config.exists(base + [ifname, 'offload', 'sg'])
-    enabled, fixed = eth.get_scatter_gather()
-    if configured and fixed:
-        config.delete(base + [ifname, 'offload', 'sg'])
-    elif enabled and not fixed:
-        config.set(base + [ifname, 'offload', 'sg'])
-
-    # If TSO is enabled by the Kernel - we reflect this on the CLI. If TSO is
-    # enabled via CLI but not supported by the NIC - we remove it from the CLI
-    configured = config.exists(base + [ifname, 'offload', 'tso'])
-    enabled, fixed = eth.get_tcp_segmentation_offload()
-    if configured and fixed:
-        config.delete(base + [ifname, 'offload', 'tso'])
-    elif enabled and not fixed:
-        config.set(base + [ifname, 'offload', 'tso'])
-
-    # Remove deprecated UDP fragmentation offloading option
-    if config.exists(base + [ifname, 'offload', 'ufo']):
-        config.delete(base + [ifname, 'offload', 'ufo'])
-
-    # Also while processing the interface configuration, not all adapters support
-    # changing the speed and duplex settings. If the desired speed and duplex
-    # values do not work for the NIC driver, we change them back to the default
-    # value of "auto" - which will be applied if the CLI node is deleted.
-    speed_path = base + [ifname, 'speed']
-    duplex_path = base + [ifname, 'duplex']
-    # speed and duplex must always be set at the same time if not set to "auto"
-    if config.exists(speed_path) and config.exists(duplex_path):
-        speed = config.return_value(speed_path)
-        duplex = config.return_value(duplex_path)
-        if speed != 'auto' and duplex != 'auto':
-            if not eth.check_speed_duplex(speed, duplex):
-                config.delete(speed_path)
-                config.delete(duplex_path)
-
-    # Also while processing the interface configuration, not all adapters support
-    # changing disabling flow-control - or change this setting. If disabling
-    # flow-control is not supported by the NIC, we remove the setting from CLI
-    flow_control_path = base + [ifname, 'disable-flow-control']
-    if config.exists(flow_control_path):
-        if not eth.check_flow_control():
-            config.delete(flow_control_path)
 
-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):
+        return
+
+    for ifname in config.list_nodes(base):
+        # Bail out early if interface vanished from system
+        if not interface_exists(ifname):
+            continue
+
+        eth = Ethtool(ifname)
+
+        # If GRO is enabled by the Kernel - we reflect this on the CLI. If GRO is
+        # enabled via CLI but not supported by the NIC - we remove it from the CLI
+        configured = config.exists(base + [ifname, 'offload', 'gro'])
+        enabled, fixed = eth.get_generic_receive_offload()
+        if configured and fixed:
+            config.delete(base + [ifname, 'offload', 'gro'])
+        elif enabled and not fixed:
+            config.set(base + [ifname, 'offload', 'gro'])
+
+        # If GSO is enabled by the Kernel - we reflect this on the CLI. If GSO is
+        # enabled via CLI but not supported by the NIC - we remove it from the CLI
+        configured = config.exists(base + [ifname, 'offload', 'gso'])
+        enabled, fixed = eth.get_generic_segmentation_offload()
+        if configured and fixed:
+            config.delete(base + [ifname, 'offload', 'gso'])
+        elif enabled and not fixed:
+            config.set(base + [ifname, 'offload', 'gso'])
+
+        # If LRO is enabled by the Kernel - we reflect this on the CLI. If LRO is
+        # enabled via CLI but not supported by the NIC - we remove it from the CLI
+        configured = config.exists(base + [ifname, 'offload', 'lro'])
+        enabled, fixed = eth.get_large_receive_offload()
+        if configured and fixed:
+            config.delete(base + [ifname, 'offload', 'lro'])
+        elif enabled and not fixed:
+            config.set(base + [ifname, 'offload', 'lro'])
+
+        # If SG is enabled by the Kernel - we reflect this on the CLI. If SG is
+        # enabled via CLI but not supported by the NIC - we remove it from the CLI
+        configured = config.exists(base + [ifname, 'offload', 'sg'])
+        enabled, fixed = eth.get_scatter_gather()
+        if configured and fixed:
+            config.delete(base + [ifname, 'offload', 'sg'])
+        elif enabled and not fixed:
+            config.set(base + [ifname, 'offload', 'sg'])
+
+        # If TSO is enabled by the Kernel - we reflect this on the CLI. If TSO is
+        # enabled via CLI but not supported by the NIC - we remove it from the CLI
+        configured = config.exists(base + [ifname, 'offload', 'tso'])
+        enabled, fixed = eth.get_tcp_segmentation_offload()
+        if configured and fixed:
+            config.delete(base + [ifname, 'offload', 'tso'])
+        elif enabled and not fixed:
+            config.set(base + [ifname, 'offload', 'tso'])
+
+        # Remove deprecated UDP fragmentation offloading option
+        if config.exists(base + [ifname, 'offload', 'ufo']):
+            config.delete(base + [ifname, 'offload', 'ufo'])
+
+        # Also while processing the interface configuration, not all adapters support
+        # changing the speed and duplex settings. If the desired speed and duplex
+        # values do not work for the NIC driver, we change them back to the default
+        # value of "auto" - which will be applied if the CLI node is deleted.
+        speed_path = base + [ifname, 'speed']
+        duplex_path = base + [ifname, 'duplex']
+        # speed and duplex must always be set at the same time if not set to "auto"
+        if config.exists(speed_path) and config.exists(duplex_path):
+            speed = config.return_value(speed_path)
+            duplex = config.return_value(duplex_path)
+            if speed != 'auto' and duplex != 'auto':
+                if not eth.check_speed_duplex(speed, duplex):
+                    config.delete(speed_path)
+                    config.delete(duplex_path)
+
+        # Also while processing the interface configuration, not all adapters support
+        # changing disabling flow-control - or change this setting. If disabling
+        # flow-control is not supported by the NIC, we remove the setting from CLI
+        flow_control_path = base + [ifname, 'disable-flow-control']
+        if config.exists(flow_control_path):
+            if not eth.check_flow_control():
+                config.delete(flow_control_path)
diff --git a/src/migration-scripts/interfaces/21-to-22 b/src/migration-scripts/interfaces/21-to-22
index 1838eb1c0..046eb10c6 100755..100644
--- a/src/migration-scripts/interfaces/21-to-22
+++ b/src/migration-scripts/interfaces/21-to-22
@@ -1,46 +1,29 @@
-#!/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/>.
 
-from sys import argv
 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 = ['interfaces', 'tunnel']
-
-if not config.exists(base):
-    exit(0)
+def migrate(config: ConfigTree) -> None:
+    base = ['interfaces', 'tunnel']
 
-for interface in config.list_nodes(base):
-    path = base + [interface, 'dhcp-interface']
-    if config.exists(path):
-        tmp = config.return_value(path)
-        config.delete(path)
-        config.set(base + [interface, 'source-interface'], value=tmp)
+    if not config.exists(base):
+        return
 
-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 interface in config.list_nodes(base):
+        path = base + [interface, 'dhcp-interface']
+        if config.exists(path):
+            tmp = config.return_value(path)
+            config.delete(path)
+            config.set(base + [interface, 'source-interface'], value=tmp)
diff --git a/src/migration-scripts/interfaces/22-to-23 b/src/migration-scripts/interfaces/22-to-23
index 04e023e77..31f7fa2ff 100755..100644
--- a/src/migration-scripts/interfaces/22-to-23
+++ b/src/migration-scripts/interfaces/22-to-23
@@ -1,39 +1,29 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2021-2023 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.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# 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 Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
 # Deletes Wireguard peers if they have the same public key as the router has.
-import sys
+
 from vyos.configtree import ConfigTree
 from vyos.utils.network import is_wireguard_key_pair
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        sys.exit(1)
-
-    file_name = sys.argv[1]
-
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'wireguard']
     if not config.exists(base):
         # Nothing to do
-        sys.exit(0)
+        return
+
     for interface in config.list_nodes(base):
         if not config.exists(base + [interface, 'private-key']):
             continue
@@ -48,10 +38,3 @@ if __name__ == '__main__':
                 if not config.exists(peer_base + ['disable']) \
                         and is_wireguard_key_pair(private_key, peer_public_key):
                     config.set(peer_base + ['disable'])
-
-    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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/23-to-24 b/src/migration-scripts/interfaces/23-to-24
index 8b21fce51..b72ceee49 100755..100644
--- a/src/migration-scripts/interfaces/23-to-24
+++ b/src/migration-scripts/interfaces/23-to-24
@@ -1,21 +1,18 @@
-#!/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/>.
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 
 def migrate_ospf(config, path, interface):
@@ -74,17 +71,7 @@ def migrate_ripng(config, path, interface):
         if len(config.list_nodes(path[:-1])) == 0:
             config.delete(path[:-1])
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     #
     # Migrate "interface ethernet eth0 ip ospf" to "protocols ospf interface eth0"
     #
@@ -136,10 +123,3 @@ if __name__ == '__main__':
                     migrate_ripng(config, vif_s_ipv6_base, ifname)
                     migrate_ospf(config, vif_s_ip_base, ifname)
                     migrate_ospfv3(config, vif_s_ipv6_base, ifname)
-
-    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)
diff --git a/src/migration-scripts/interfaces/24-to-25 b/src/migration-scripts/interfaces/24-to-25
index 8fd79ecc6..9f8cc80ec 100755..100644
--- a/src/migration-scripts/interfaces/24-to-25
+++ b/src/migration-scripts/interfaces/24-to-25
@@ -1,41 +1,29 @@
-#!/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/>.
 
 # A VTI interface also requires an IPSec configuration - VyOS 1.2 supported
 # having a VTI interface in the CLI but no IPSec configuration - drop VTI
 # configuration if this is the case for VyOS 1.4
 
-import sys
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        sys.exit(1)
-
-    file_name = sys.argv[1]
-
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'vti']
     if not config.exists(base):
         # Nothing to do
-        sys.exit(0)
+        return
 
     ipsec_base = ['vpn', 'ipsec', 'site-to-site', 'peer']
     for interface in config.list_nodes(base):
@@ -51,10 +39,3 @@ if __name__ == '__main__':
                         break
         if not found:
             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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/25-to-26 b/src/migration-scripts/interfaces/25-to-26
index 9aa6ea5e3..7a4032d10 100755..100644
--- a/src/migration-scripts/interfaces/25-to-26
+++ b/src/migration-scripts/interfaces/25-to-26
@@ -1,24 +1,22 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2021-2023 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/>.
 
 # Migrate Wireguard to store keys in CLI
 # Migrate EAPoL to PKI configuration
 
 import os
-import sys
 
 from vyos.configtree import ConfigTree
 from vyos.pki import CERT_BEGIN
@@ -53,335 +51,318 @@ def read_file_for_pki(config_auth_path):
 
     return output
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
-
 AUTH_DIR = '/config/auth'
 pki_base = ['pki']
 
-# OpenVPN
-base = ['interfaces', 'openvpn']
+def migrate(config: ConfigTree) -> None:
+    # OpenVPN
+    base = ['interfaces', 'openvpn']
+
+    if config.exists(base):
+        for interface in config.list_nodes(base):
+            x509_base = base + [interface, 'tls']
+            pki_name = f'openvpn_{interface}'
+
+            if config.exists(base + [interface, 'shared-secret-key-file']):
+                if not config.exists(pki_base + ['openvpn', 'shared-secret']):
+                    config.set(pki_base + ['openvpn', 'shared-secret'])
+                    config.set_tag(pki_base + ['openvpn', 'shared-secret'])
+
+                key_file = config.return_value(base + [interface, 'shared-secret-key-file'])
+                key = read_file_for_pki(key_file)
+                key_pki_name = f'{pki_name}_shared'
+
+                if key:
+                    config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
+                    config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
+                    config.set(base + [interface, 'shared-secret-key'], value=key_pki_name)
+                else:
+                    print(f'Failed to migrate shared-secret-key on openvpn interface {interface}')
+
+                config.delete(base + [interface, 'shared-secret-key-file'])
+
+            if not config.exists(base + [interface, 'tls']):
+                continue
+
+            if config.exists(base + [interface, 'tls', 'auth-file']):
+                if not config.exists(pki_base + ['openvpn', 'shared-secret']):
+                    config.set(pki_base + ['openvpn', 'shared-secret'])
+                    config.set_tag(pki_base + ['openvpn', 'shared-secret'])
+
+                key_file = config.return_value(base + [interface, 'tls', 'auth-file'])
+                key = read_file_for_pki(key_file)
+                key_pki_name = f'{pki_name}_auth'
+
+                if key:
+                    config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
+                    config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
+                    config.set(base + [interface, 'tls', 'auth-key'], value=key_pki_name)
+                else:
+                    print(f'Failed to migrate auth-key on openvpn interface {interface}')
+
+                config.delete(base + [interface, 'tls', 'auth-file'])
+
+            if config.exists(base + [interface, 'tls', 'crypt-file']):
+                if not config.exists(pki_base + ['openvpn', 'shared-secret']):
+                    config.set(pki_base + ['openvpn', 'shared-secret'])
+                    config.set_tag(pki_base + ['openvpn', 'shared-secret'])
+
+                key_file = config.return_value(base + [interface, 'tls', 'crypt-file'])
+                key = read_file_for_pki(key_file)
+                key_pki_name = f'{pki_name}_crypt'
+
+                if key:
+                    config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
+                    config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
+                    config.set(base + [interface, 'tls', 'crypt-key'], value=key_pki_name)
+                else:
+                    print(f'Failed to migrate crypt-key on openvpn interface {interface}')
+
+                config.delete(base + [interface, 'tls', 'crypt-file'])
+
+            ca_certs = {}
+
+            if config.exists(x509_base + ['ca-cert-file']):
+                if not config.exists(pki_base + ['ca']):
+                    config.set(pki_base + ['ca'])
+                    config.set_tag(pki_base + ['ca'])
+
+                cert_file = config.return_value(x509_base + ['ca-cert-file'])
+                cert_path = os.path.join(AUTH_DIR, cert_file)
+
+                if os.path.isfile(cert_path):
+                    if not os.access(cert_path, os.R_OK):
+                        run(f'sudo chmod 644 {cert_path}')
+
+                    with open(cert_path, 'r') as f:
+                        certs_str = f.read()
+                        certs_data = certs_str.split(CERT_BEGIN)
+                        index = 1
+                        for cert_data in certs_data[1:]:
+                            cert = load_certificate(CERT_BEGIN + cert_data, wrap_tags=False)
+
+                            if cert:
+                                ca_certs[f'{pki_name}_{index}'] = cert
+                                cert_pem = encode_certificate(cert)
+                                config.set(pki_base + ['ca', f'{pki_name}_{index}', 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
+                                config.set(x509_base + ['ca-certificate'], value=f'{pki_name}_{index}', replace=False)
+                            else:
+                                print(f'Failed to migrate CA certificate on openvpn interface {interface}')
+
+                            index += 1
+                else:
+                    print(f'Failed to migrate CA certificate on openvpn interface {interface}')
+
+                config.delete(x509_base + ['ca-cert-file'])
+
+            if config.exists(x509_base + ['crl-file']):
+                if not config.exists(pki_base + ['ca']):
+                    config.set(pki_base + ['ca'])
+                    config.set_tag(pki_base + ['ca'])
+
+                crl_file = config.return_value(x509_base + ['crl-file'])
+                crl_path = os.path.join(AUTH_DIR, crl_file)
+                crl = None
+                crl_ca_name = None
+
+                if os.path.isfile(crl_path):
+                    if not os.access(crl_path, os.R_OK):
+                        run(f'sudo chmod 644 {crl_path}')
+
+                    with open(crl_path, 'r') as f:
+                        crl_data = f.read()
+                        crl = load_crl(crl_data, wrap_tags=False)
+
+                        for ca_name, ca_cert in ca_certs.items():
+                            if verify_crl(crl, ca_cert):
+                                crl_ca_name = ca_name
+                                break
+
+                if crl and crl_ca_name:
+                    crl_pem = encode_certificate(crl)
+                    config.set(pki_base + ['ca', crl_ca_name, 'crl'], value=wrapped_pem_to_config_value(crl_pem))
+                else:
+                    print(f'Failed to migrate CRL on openvpn interface {interface}')
+
+                config.delete(x509_base + ['crl-file'])
+
+            if config.exists(x509_base + ['cert-file']):
+                if not config.exists(pki_base + ['certificate']):
+                    config.set(pki_base + ['certificate'])
+                    config.set_tag(pki_base + ['certificate'])
+
+                cert_file = config.return_value(x509_base + ['cert-file'])
+                cert_path = os.path.join(AUTH_DIR, cert_file)
+                cert = None
+
+                if os.path.isfile(cert_path):
+                    if not os.access(cert_path, os.R_OK):
+                        run(f'sudo chmod 644 {cert_path}')
+
+                    with open(cert_path, 'r') as f:
+                        cert_data = f.read()
+                        cert = load_certificate(cert_data, wrap_tags=False)
+
+                if cert:
+                    cert_pem = encode_certificate(cert)
+                    config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
+                    config.set(x509_base + ['certificate'], value=pki_name)
+                else:
+                    print(f'Failed to migrate certificate on openvpn interface {interface}')
+
+                config.delete(x509_base + ['cert-file'])
+
+            if config.exists(x509_base + ['key-file']):
+                key_file = config.return_value(x509_base + ['key-file'])
+                key_path = os.path.join(AUTH_DIR, key_file)
+                key = None
+
+                if os.path.isfile(key_path):
+                    if not os.access(key_path, os.R_OK):
+                        run(f'sudo chmod 644 {key_path}')
+
+                    with open(key_path, 'r') as f:
+                        key_data = f.read()
+                        key = load_private_key(key_data, passphrase=None, wrap_tags=False)
+
+                if key:
+                    key_pem = encode_private_key(key, passphrase=None)
+                    config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
+                else:
+                    print(f'Failed to migrate private key on openvpn interface {interface}')
+
+                config.delete(x509_base + ['key-file'])
+
+            if config.exists(x509_base + ['dh-file']):
+                if not config.exists(pki_base + ['dh']):
+                    config.set(pki_base + ['dh'])
+                    config.set_tag(pki_base + ['dh'])
+
+                dh_file = config.return_value(x509_base + ['dh-file'])
+                dh_path = os.path.join(AUTH_DIR, dh_file)
+                dh = None
+
+                if os.path.isfile(dh_path):
+                    if not os.access(dh_path, os.R_OK):
+                        run(f'sudo chmod 644 {dh_path}')
+
+                    with open(dh_path, 'r') as f:
+                        dh_data = f.read()
+                        dh = load_dh_parameters(dh_data, wrap_tags=False)
+
+                if dh:
+                    dh_pem = encode_dh_parameters(dh)
+                    config.set(pki_base + ['dh', pki_name, 'parameters'], value=wrapped_pem_to_config_value(dh_pem))
+                    config.set(x509_base + ['dh-params'], value=pki_name)
+                else:
+                    print(f'Failed to migrate DH parameters on openvpn interface {interface}')
+
+                config.delete(x509_base + ['dh-file'])
+
+    # Wireguard
+    base = ['interfaces', 'wireguard']
+
+    if config.exists(base):
+        for interface in config.list_nodes(base):
+            private_key_path = base + [interface, 'private-key']
+
+            key_file = 'default'
+            if config.exists(private_key_path):
+                key_file = config.return_value(private_key_path)
+
+            full_key_path = f'/config/auth/wireguard/{key_file}/private.key'
+
+            if not os.path.exists(full_key_path):
+                print(f'Could not find wireguard private key for migration on interface "{interface}"')
+                continue
+
+            with open(full_key_path, 'r') as f:
+                key_data = f.read().strip()
+                config.set(private_key_path, value=key_data)
+
+            for peer in config.list_nodes(base + [interface, 'peer']):
+                config.rename(base + [interface, 'peer', peer, 'pubkey'], 'public-key')
+
+    # Ethernet EAPoL
+    base = ['interfaces', 'ethernet']
+
+    if config.exists(base):
+        for interface in config.list_nodes(base):
+            if not config.exists(base + [interface, 'eapol']):
+                continue
+
+            x509_base = base + [interface, 'eapol']
+            pki_name = f'eapol_{interface}'
+
+            if config.exists(x509_base + ['ca-cert-file']):
+                if not config.exists(pki_base + ['ca']):
+                    config.set(pki_base + ['ca'])
+                    config.set_tag(pki_base + ['ca'])
+
+                cert_file = config.return_value(x509_base + ['ca-cert-file'])
+                cert_path = os.path.join(AUTH_DIR, cert_file)
+                cert = None
+
+                if os.path.isfile(cert_path):
+                    if not os.access(cert_path, os.R_OK):
+                        run(f'sudo chmod 644 {cert_path}')
+
+                    with open(cert_path, 'r') as f:
+                        cert_data = f.read()
+                        cert = load_certificate(cert_data, wrap_tags=False)
+
+                if cert:
+                    cert_pem = encode_certificate(cert)
+                    config.set(pki_base + ['ca', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
+                    config.set(x509_base + ['ca-certificate'], value=pki_name)
+                else:
+                    print(f'Failed to migrate CA certificate on eapol config for interface {interface}')
+
+                config.delete(x509_base + ['ca-cert-file'])
 
-if config.exists(base):
-    for interface in config.list_nodes(base):
-        x509_base = base + [interface, 'tls']
-        pki_name = f'openvpn_{interface}'
+            if config.exists(x509_base + ['cert-file']):
+                if not config.exists(pki_base + ['certificate']):
+                    config.set(pki_base + ['certificate'])
+                    config.set_tag(pki_base + ['certificate'])
 
-        if config.exists(base + [interface, 'shared-secret-key-file']):
-            if not config.exists(pki_base + ['openvpn', 'shared-secret']):
-                config.set(pki_base + ['openvpn', 'shared-secret'])
-                config.set_tag(pki_base + ['openvpn', 'shared-secret'])
+                cert_file = config.return_value(x509_base + ['cert-file'])
+                cert_path = os.path.join(AUTH_DIR, cert_file)
+                cert = None
 
-            key_file = config.return_value(base + [interface, 'shared-secret-key-file'])
-            key = read_file_for_pki(key_file)
-            key_pki_name = f'{pki_name}_shared'
+                if os.path.isfile(cert_path):
+                    if not os.access(cert_path, os.R_OK):
+                        run(f'sudo chmod 644 {cert_path}')
 
-            if key:
-                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
-                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
-                config.set(base + [interface, 'shared-secret-key'], value=key_pki_name)
-            else:
-                print(f'Failed to migrate shared-secret-key on openvpn interface {interface}')
+                    with open(cert_path, 'r') as f:
+                        cert_data = f.read()
+                        cert = load_certificate(cert_data, wrap_tags=False)
 
-            config.delete(base + [interface, 'shared-secret-key-file'])
+                if cert:
+                    cert_pem = encode_certificate(cert)
+                    config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
+                    config.set(x509_base + ['certificate'], value=pki_name)
+                else:
+                    print(f'Failed to migrate certificate on eapol config for interface {interface}')
 
-        if not config.exists(base + [interface, 'tls']):
-            continue
+                config.delete(x509_base + ['cert-file'])
 
-        if config.exists(base + [interface, 'tls', 'auth-file']):
-            if not config.exists(pki_base + ['openvpn', 'shared-secret']):
-                config.set(pki_base + ['openvpn', 'shared-secret'])
-                config.set_tag(pki_base + ['openvpn', 'shared-secret'])
-
-            key_file = config.return_value(base + [interface, 'tls', 'auth-file'])
-            key = read_file_for_pki(key_file)
-            key_pki_name = f'{pki_name}_auth'
-
-            if key:
-                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
-                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
-                config.set(base + [interface, 'tls', 'auth-key'], value=key_pki_name)
-            else:
-                print(f'Failed to migrate auth-key on openvpn interface {interface}')
-
-            config.delete(base + [interface, 'tls', 'auth-file'])
-
-        if config.exists(base + [interface, 'tls', 'crypt-file']):
-            if not config.exists(pki_base + ['openvpn', 'shared-secret']):
-                config.set(pki_base + ['openvpn', 'shared-secret'])
-                config.set_tag(pki_base + ['openvpn', 'shared-secret'])
-
-            key_file = config.return_value(base + [interface, 'tls', 'crypt-file'])
-            key = read_file_for_pki(key_file)
-            key_pki_name = f'{pki_name}_crypt'
-
-            if key:
-                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'key'], value=wrapped_pem_to_config_value(key))
-                config.set(pki_base + ['openvpn', 'shared-secret', key_pki_name, 'version'], value='1')
-                config.set(base + [interface, 'tls', 'crypt-key'], value=key_pki_name)
-            else:
-                print(f'Failed to migrate crypt-key on openvpn interface {interface}')
-
-            config.delete(base + [interface, 'tls', 'crypt-file'])
-
-        ca_certs = {}
-
-        if config.exists(x509_base + ['ca-cert-file']):
-            if not config.exists(pki_base + ['ca']):
-                config.set(pki_base + ['ca'])
-                config.set_tag(pki_base + ['ca'])
-
-            cert_file = config.return_value(x509_base + ['ca-cert-file'])
-            cert_path = os.path.join(AUTH_DIR, cert_file)
-
-            if os.path.isfile(cert_path):
-                if not os.access(cert_path, os.R_OK):
-                    run(f'sudo chmod 644 {cert_path}')
-
-                with open(cert_path, 'r') as f:
-                    certs_str = f.read()
-                    certs_data = certs_str.split(CERT_BEGIN)
-                    index = 1
-                    for cert_data in certs_data[1:]:
-                        cert = load_certificate(CERT_BEGIN + cert_data, wrap_tags=False)
-
-                        if cert:
-                            ca_certs[f'{pki_name}_{index}'] = cert
-                            cert_pem = encode_certificate(cert)
-                            config.set(pki_base + ['ca', f'{pki_name}_{index}', 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
-                            config.set(x509_base + ['ca-certificate'], value=f'{pki_name}_{index}', replace=False)
-                        else:
-                            print(f'Failed to migrate CA certificate on openvpn interface {interface}')
-
-                        index += 1
-            else:
-                print(f'Failed to migrate CA certificate on openvpn interface {interface}')
-
-            config.delete(x509_base + ['ca-cert-file'])
-
-        if config.exists(x509_base + ['crl-file']):
-            if not config.exists(pki_base + ['ca']):
-                config.set(pki_base + ['ca'])
-                config.set_tag(pki_base + ['ca'])
-
-            crl_file = config.return_value(x509_base + ['crl-file'])
-            crl_path = os.path.join(AUTH_DIR, crl_file)
-            crl = None
-            crl_ca_name = None
-
-            if os.path.isfile(crl_path):
-                if not os.access(crl_path, os.R_OK):
-                    run(f'sudo chmod 644 {crl_path}')
-
-                with open(crl_path, 'r') as f:
-                    crl_data = f.read()
-                    crl = load_crl(crl_data, wrap_tags=False)
-
-                    for ca_name, ca_cert in ca_certs.items():
-                        if verify_crl(crl, ca_cert):
-                            crl_ca_name = ca_name
-                            break
-
-            if crl and crl_ca_name:
-                crl_pem = encode_certificate(crl)
-                config.set(pki_base + ['ca', crl_ca_name, 'crl'], value=wrapped_pem_to_config_value(crl_pem))
-            else:
-                print(f'Failed to migrate CRL on openvpn interface {interface}')
-
-            config.delete(x509_base + ['crl-file'])
-
-        if config.exists(x509_base + ['cert-file']):
-            if not config.exists(pki_base + ['certificate']):
-                config.set(pki_base + ['certificate'])
-                config.set_tag(pki_base + ['certificate'])
-
-            cert_file = config.return_value(x509_base + ['cert-file'])
-            cert_path = os.path.join(AUTH_DIR, cert_file)
-            cert = None
-
-            if os.path.isfile(cert_path):
-                if not os.access(cert_path, os.R_OK):
-                    run(f'sudo chmod 644 {cert_path}')
-
-                with open(cert_path, 'r') as f:
-                    cert_data = f.read()
-                    cert = load_certificate(cert_data, wrap_tags=False)
-
-            if cert:
-                cert_pem = encode_certificate(cert)
-                config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
-                config.set(x509_base + ['certificate'], value=pki_name)
-            else:
-                print(f'Failed to migrate certificate on openvpn interface {interface}')
-
-            config.delete(x509_base + ['cert-file'])
-
-        if config.exists(x509_base + ['key-file']):
-            key_file = config.return_value(x509_base + ['key-file'])
-            key_path = os.path.join(AUTH_DIR, key_file)
-            key = None
-
-            if os.path.isfile(key_path):
-                if not os.access(key_path, os.R_OK):
-                    run(f'sudo chmod 644 {key_path}')
-
-                with open(key_path, 'r') as f:
-                    key_data = f.read()
-                    key = load_private_key(key_data, passphrase=None, wrap_tags=False)
-
-            if key:
-                key_pem = encode_private_key(key, passphrase=None)
-                config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
-            else:
-                print(f'Failed to migrate private key on openvpn interface {interface}')
-
-            config.delete(x509_base + ['key-file'])
-
-        if config.exists(x509_base + ['dh-file']):
-            if not config.exists(pki_base + ['dh']):
-                config.set(pki_base + ['dh'])
-                config.set_tag(pki_base + ['dh'])
-
-            dh_file = config.return_value(x509_base + ['dh-file'])
-            dh_path = os.path.join(AUTH_DIR, dh_file)
-            dh = None
-
-            if os.path.isfile(dh_path):
-                if not os.access(dh_path, os.R_OK):
-                    run(f'sudo chmod 644 {dh_path}')
-
-                with open(dh_path, 'r') as f:
-                    dh_data = f.read()
-                    dh = load_dh_parameters(dh_data, wrap_tags=False)
-
-            if dh:
-                dh_pem = encode_dh_parameters(dh)
-                config.set(pki_base + ['dh', pki_name, 'parameters'], value=wrapped_pem_to_config_value(dh_pem))
-                config.set(x509_base + ['dh-params'], value=pki_name)
-            else:
-                print(f'Failed to migrate DH parameters on openvpn interface {interface}')
-
-            config.delete(x509_base + ['dh-file'])
-
-# Wireguard
-base = ['interfaces', 'wireguard']
-
-if config.exists(base):
-    for interface in config.list_nodes(base):
-        private_key_path = base + [interface, 'private-key']
-
-        key_file = 'default'
-        if config.exists(private_key_path):
-            key_file = config.return_value(private_key_path)
-
-        full_key_path = f'/config/auth/wireguard/{key_file}/private.key'
+            if config.exists(x509_base + ['key-file']):
+                key_file = config.return_value(x509_base + ['key-file'])
+                key_path = os.path.join(AUTH_DIR, key_file)
+                key = None
+
+                if os.path.isfile(key_path):
+                    if not os.access(key_path, os.R_OK):
+                        run(f'sudo chmod 644 {key_path}')
 
-        if not os.path.exists(full_key_path):
-            print(f'Could not find wireguard private key for migration on interface "{interface}"')
-            continue
-
-        with open(full_key_path, 'r') as f:
-            key_data = f.read().strip()
-            config.set(private_key_path, value=key_data)
-
-        for peer in config.list_nodes(base + [interface, 'peer']):
-            config.rename(base + [interface, 'peer', peer, 'pubkey'], 'public-key')
+                    with open(key_path, 'r') as f:
+                        key_data = f.read()
+                        key = load_private_key(key_data, passphrase=None, wrap_tags=False)
 
-# Ethernet EAPoL
-base = ['interfaces', 'ethernet']
-
-if config.exists(base):
-    for interface in config.list_nodes(base):
-        if not config.exists(base + [interface, 'eapol']):
-            continue
+                if key:
+                    key_pem = encode_private_key(key, passphrase=None)
+                    config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
+                else:
+                    print(f'Failed to migrate private key on eapol config for interface {interface}')
 
-        x509_base = base + [interface, 'eapol']
-        pki_name = f'eapol_{interface}'
-
-        if config.exists(x509_base + ['ca-cert-file']):
-            if not config.exists(pki_base + ['ca']):
-                config.set(pki_base + ['ca'])
-                config.set_tag(pki_base + ['ca'])
-
-            cert_file = config.return_value(x509_base + ['ca-cert-file'])
-            cert_path = os.path.join(AUTH_DIR, cert_file)
-            cert = None
-
-            if os.path.isfile(cert_path):
-                if not os.access(cert_path, os.R_OK):
-                    run(f'sudo chmod 644 {cert_path}')
-
-                with open(cert_path, 'r') as f:
-                    cert_data = f.read()
-                    cert = load_certificate(cert_data, wrap_tags=False)
-
-            if cert:
-                cert_pem = encode_certificate(cert)
-                config.set(pki_base + ['ca', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
-                config.set(x509_base + ['ca-certificate'], value=pki_name)
-            else:
-                print(f'Failed to migrate CA certificate on eapol config for interface {interface}')
-
-            config.delete(x509_base + ['ca-cert-file'])
-
-        if config.exists(x509_base + ['cert-file']):
-            if not config.exists(pki_base + ['certificate']):
-                config.set(pki_base + ['certificate'])
-                config.set_tag(pki_base + ['certificate'])
-
-            cert_file = config.return_value(x509_base + ['cert-file'])
-            cert_path = os.path.join(AUTH_DIR, cert_file)
-            cert = None
-
-            if os.path.isfile(cert_path):
-                if not os.access(cert_path, os.R_OK):
-                    run(f'sudo chmod 644 {cert_path}')
-
-                with open(cert_path, 'r') as f:
-                    cert_data = f.read()
-                    cert = load_certificate(cert_data, wrap_tags=False)
-
-            if cert:
-                cert_pem = encode_certificate(cert)
-                config.set(pki_base + ['certificate', pki_name, 'certificate'], value=wrapped_pem_to_config_value(cert_pem))
-                config.set(x509_base + ['certificate'], value=pki_name)
-            else:
-                print(f'Failed to migrate certificate on eapol config for interface {interface}')
-
-            config.delete(x509_base + ['cert-file'])
-
-        if config.exists(x509_base + ['key-file']):
-            key_file = config.return_value(x509_base + ['key-file'])
-            key_path = os.path.join(AUTH_DIR, key_file)
-            key = None
-
-            if os.path.isfile(key_path):
-                if not os.access(key_path, os.R_OK):
-                    run(f'sudo chmod 644 {key_path}')
-
-                with open(key_path, 'r') as f:
-                    key_data = f.read()
-                    key = load_private_key(key_data, passphrase=None, wrap_tags=False)
-
-            if key:
-                key_pem = encode_private_key(key, passphrase=None)
-                config.set(pki_base + ['certificate', pki_name, 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))
-            else:
-                print(f'Failed to migrate private key on eapol config for interface {interface}')
-
-            config.delete(x509_base + ['key-file'])
-
-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))
-    sys.exit(1)
+                config.delete(x509_base + ['key-file'])
diff --git a/src/migration-scripts/interfaces/26-to-27 b/src/migration-scripts/interfaces/26-to-27
index 429ab650f..3f58de02c 100755..100644
--- a/src/migration-scripts/interfaces/26-to-27
+++ b/src/migration-scripts/interfaces/26-to-27
@@ -1,52 +1,35 @@
-#!/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/>.
 
 # T4384: pppoe: replace default-route CLI option with common CLI nodes already
 #        present for DHCP
 
-from sys import argv
 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 = ['interfaces', 'pppoe']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    exit(0)
-
-for ifname in config.list_nodes(base):
-    tmp_config = base + [ifname, 'default-route']
-    if config.exists(tmp_config):
-        # Retrieve current config value
-        value = config.return_value(tmp_config)
-        # Delete old Config node
-        config.delete(tmp_config)
-        if value == 'none':
-            config.set(base + [ifname, 'no-default-route'])
-
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    base = ['interfaces', 'pppoe']
+
+    if not config.exists(base):
+        return
+
+    for ifname in config.list_nodes(base):
+        tmp_config = base + [ifname, 'default-route']
+        if config.exists(tmp_config):
+            # Retrieve current config value
+            value = config.return_value(tmp_config)
+            # Delete old Config node
+            config.delete(tmp_config)
+            if value == 'none':
+                config.set(base + [ifname, 'no-default-route'])
diff --git a/src/migration-scripts/interfaces/27-to-28 b/src/migration-scripts/interfaces/27-to-28
index 9f5e93b5f..eb9363e39 100755..100644
--- a/src/migration-scripts/interfaces/27-to-28
+++ b/src/migration-scripts/interfaces/27-to-28
@@ -1,48 +1,29 @@
-#!/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/>.
 
 # T4995: pppoe, wwan, sstpc-client rename "authentication user" CLI node
 #        to "authentication username"
 
-from sys import argv
-
 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)
-
-for type in ['pppoe', 'sstpc-client', 'wwam']:
-    base = ['interfaces', type]
-    if not config.exists(base):
-        continue
-    for interface in config.list_nodes(base):
-        auth_base = base + [interface, 'authentication', 'user']
-        if config.exists(auth_base):
-            config.rename(auth_base, 'username')
-
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    for type in ['pppoe', 'sstpc-client', 'wwam']:
+        base = ['interfaces', type]
+        if not config.exists(base):
+            continue
+        for interface in config.list_nodes(base):
+            auth_base = base + [interface, 'authentication', 'user']
+            if config.exists(auth_base):
+                config.rename(auth_base, 'username')
diff --git a/src/migration-scripts/interfaces/28-to-29 b/src/migration-scripts/interfaces/28-to-29
index 0437977dc..886d49e2c 100755..100644
--- a/src/migration-scripts/interfaces/28-to-29
+++ b/src/migration-scripts/interfaces/28-to-29
@@ -1,52 +1,35 @@
-#!/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/>.
 
 # T5034: tunnel: rename "multicast enable" CLI node to "enable-multicast"
 #        valueless node.
 
-from sys import argv
 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 = ['interfaces', 'tunnel']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    exit(0)
-
-for ifname in config.list_nodes(base):
-    multicast_base = base + [ifname, 'multicast']
-    if config.exists(multicast_base):
-        tmp = config.return_value(multicast_base)
-        print(tmp)
-        # Delete old Config node
-        config.delete(multicast_base)
-        if tmp == 'enable':
-            config.set(base + [ifname, 'enable-multicast'])
 
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        return
+
+    for ifname in config.list_nodes(base):
+        multicast_base = base + [ifname, 'multicast']
+        if config.exists(multicast_base):
+            tmp = config.return_value(multicast_base)
+            print(tmp)
+            # Delete old Config node
+            config.delete(multicast_base)
+            if tmp == 'enable':
+                config.set(base + [ifname, 'enable-multicast'])
diff --git a/src/migration-scripts/interfaces/29-to-30 b/src/migration-scripts/interfaces/29-to-30
index 80aad1d44..7b32d871e 100755..100644
--- a/src/migration-scripts/interfaces/29-to-30
+++ b/src/migration-scripts/interfaces/29-to-30
@@ -1,47 +1,30 @@
-#!/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/>.
 
 # T5286: remove XDP support in favour of VPP
 
-from sys import argv
 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()
-
 supports_xdp = ['bonding', 'ethernet']
-config = ConfigTree(config_file)
-
-for if_type in supports_xdp:
-    base = ['interfaces', if_type]
-    if not config.exists(base):
-        continue
-    for interface in config.list_nodes(base):
-        if_base = base + [interface]
-        if config.exists(if_base + ['xdp']):
-            config.delete(if_base + ['xdp'])
 
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    for if_type in supports_xdp:
+        base = ['interfaces', if_type]
+        if not config.exists(base):
+            continue
+        for interface in config.list_nodes(base):
+            if_base = base + [interface]
+            if config.exists(if_base + ['xdp']):
+                config.delete(if_base + ['xdp'])
diff --git a/src/migration-scripts/interfaces/3-to-4 b/src/migration-scripts/interfaces/3-to-4
index c7fd7d01d..4e56200e1 100755..100644
--- a/src/migration-scripts/interfaces/3-to-4
+++ b/src/migration-scripts/interfaces/3-to-4
@@ -1,27 +1,30 @@
-#!/usr/bin/env python3
+# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# 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 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
+# Lesser General Public License for more details.
+#
+# 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/>.
 
 # Change syntax of wireless interfaces
 # Migrate boolean nodes to valueless
 
-import sys
 from vyos.configtree import ConfigTree
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
 base = ['interfaces', 'wireless']
 
-if not config.exists(base):
-    # Nothing to do
-    sys.exit(0)
-else:
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
     for wifi in config.list_nodes(base):
         # as converting a node to bool is always the same, we can script it
         to_bool_nodes = ['capabilities ht 40MHz-incapable',
@@ -88,10 +91,3 @@ else:
 
             # delete old radius-server nodes
             config.delete(base + [wifi, 'security', 'wpa', 'radius-server'])
-
-    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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/30-to-31 b/src/migration-scripts/interfaces/30-to-31
index 894106ef4..7e509dd86 100755..100644
--- a/src/migration-scripts/interfaces/30-to-31
+++ b/src/migration-scripts/interfaces/30-to-31
@@ -1,71 +1,56 @@
 #!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2021-2023 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.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
 #
-# Deletes Wireguard peers if they have the same public key as the router has.
+# 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/>.
+
+# T5254: Fixed changing ethernet when it is a bond member
 
 import json
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 from vyos.ifconfig import EthernetIf
 from vyos.ifconfig import BondIf
 from vyos.utils.dict import dict_to_paths_values
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
+base = ['interfaces', 'bonding']
 
-file_name = argv[1]
-with open(file_name, 'r') as f:
-    config_file = f.read()
-    base = ['interfaces', 'bonding']
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-config = ConfigTree(config_file)
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-for bond in config.list_nodes(base):
-    member_base = base + [bond, 'member', 'interface']
-    if config.exists(member_base):
-        for interface in config.return_values(member_base):
-            if_base = ['interfaces', 'ethernet', interface]
-            if config.exists(if_base):
-                config_ethernet = json.loads(config.get_subtree(if_base).to_json())
-                eth_dict_paths = dict_to_paths_values(config_ethernet)
-                for option_path, option_value in eth_dict_paths.items():
-                    # If option is allowed for changing then continue
-                    converted_path = option_path.replace('-','_')
-                    if converted_path in EthernetIf.get_bond_member_allowed_options():
-                        continue
-                    # if option is inherited from bond then continue
-                    if converted_path in BondIf.get_inherit_bond_options():
-                        continue
-                    option_path_list = option_path.split('.')
-                    config.delete(if_base + option_path_list)
-                    del option_path_list[-1]
-                    # delete empty node from config
-                    while len(option_path_list) > 0:
-                        if config.list_nodes(if_base + option_path_list):
-                            break
+    for bond in config.list_nodes(base):
+        member_base = base + [bond, 'member', 'interface']
+        if config.exists(member_base):
+            for interface in config.return_values(member_base):
+                if_base = ['interfaces', 'ethernet', interface]
+                if config.exists(if_base):
+                    config_ethernet = json.loads(config.get_subtree(if_base).to_json())
+                    eth_dict_paths = dict_to_paths_values(config_ethernet)
+                    for option_path, option_value in eth_dict_paths.items():
+                        # If option is allowed for changing then continue
+                        converted_path = option_path.replace('-','_')
+                        if converted_path in EthernetIf.get_bond_member_allowed_options():
+                            continue
+                        # if option is inherited from bond then continue
+                        if converted_path in BondIf.get_inherit_bond_options():
+                            continue
+                        option_path_list = option_path.split('.')
                         config.delete(if_base + option_path_list)
                         del option_path_list[-1]
-
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+                        # delete empty node from config
+                        while len(option_path_list) > 0:
+                            if config.list_nodes(if_base + option_path_list):
+                                break
+                            config.delete(if_base + option_path_list)
+                            del option_path_list[-1]
diff --git a/src/migration-scripts/interfaces/31-to-32 b/src/migration-scripts/interfaces/31-to-32
index 0fc27b70a..24077ed24 100755..100644
--- a/src/migration-scripts/interfaces/31-to-32
+++ b/src/migration-scripts/interfaces/31-to-32
@@ -1,55 +1,37 @@
-#!/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.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# 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 Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
 # T5671: change port to IANA assigned default port
 # T5759: change default MTU 1450 -> 1500
 
-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 = ['interfaces', 'vxlan']
 
-config = ConfigTree(config_file)
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-for vxlan in config.list_nodes(base):
-    if config.exists(base + [vxlan, 'external']):
-        config.delete(base + [vxlan, 'external'])
-        config.set(base + [vxlan, 'parameters', 'external'])
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-    if not config.exists(base + [vxlan, 'port']):
-        config.set(base + [vxlan, 'port'], value='8472')
+    for vxlan in config.list_nodes(base):
+        if config.exists(base + [vxlan, 'external']):
+            config.delete(base + [vxlan, 'external'])
+            config.set(base + [vxlan, 'parameters', 'external'])
 
-    if not config.exists(base + [vxlan, 'mtu']):
-        config.set(base + [vxlan, 'mtu'], value='1450')
+        if not config.exists(base + [vxlan, 'port']):
+            config.set(base + [vxlan, 'port'], value='8472')
 
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+        if not config.exists(base + [vxlan, 'mtu']):
+            config.set(base + [vxlan, 'mtu'], value='1450')
diff --git a/src/migration-scripts/interfaces/32-to-33 b/src/migration-scripts/interfaces/32-to-33
index caf588474..c7b1c5b36 100755..100644
--- a/src/migration-scripts/interfaces/32-to-33
+++ b/src/migration-scripts/interfaces/32-to-33
@@ -16,42 +16,25 @@
 #
 # T6318: WiFi country-code should be set system-wide instead of per-device
 
-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 = ['interfaces', 'wireless']
 
-config = ConfigTree(config_file)
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-installed = False
-for interface in config.list_nodes(base):
-    cc_path = base + [interface, 'country-code']
-    if config.exists(cc_path):
-        tmp = config.return_value(cc_path)
-        config.delete(cc_path)
-
-        # There can be only ONE wireless country-code per device, everything
-        # else makes no sense as a WIFI router can not operate in two
-        # different countries
-        if not installed:
-            config.set(['system', 'wireless', 'country-code'], value=tmp)
-            installed = True
-
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    installed = False
+    for interface in config.list_nodes(base):
+        cc_path = base + [interface, 'country-code']
+        if config.exists(cc_path):
+            tmp = config.return_value(cc_path)
+            config.delete(cc_path)
+
+            # There can be only ONE wireless country-code per device, everything
+            # else makes no sense as a WIFI router can not operate in two
+            # different countries
+            if not installed:
+                config.set(['system', 'wireless', 'country-code'], value=tmp)
+                installed = True
diff --git a/src/migration-scripts/interfaces/4-to-5 b/src/migration-scripts/interfaces/4-to-5
index 68d81e846..93fa7c393 100755..100644
--- a/src/migration-scripts/interfaces/4-to-5
+++ b/src/migration-scripts/interfaces/4-to-5
@@ -1,9 +1,21 @@
-#!/usr/bin/env python3
+# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# 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 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
+# Lesser General Public License for more details.
+#
+# 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/>.
 
 # De-nest PPPoE interfaces
 # Migrate boolean nodes to valueless
 
-import sys
 from vyos.configtree import ConfigTree
 
 def migrate_dialer(config, tree, intf):
@@ -55,18 +67,7 @@ def migrate_dialer(config, tree, intf):
         if config.exists(ipv6_ra):
             config.delete(ipv6_ra)
 
-
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        exit(1)
-
-    file_name = sys.argv[1]
-
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     pppoe_links = ['bonding', 'ethernet']
 
     for link_type in pppoe_links:
@@ -103,10 +104,3 @@ if __name__ == '__main__':
                     # Add interface description that this is required for PPPoE
                     if not config.exists(vlan_if + ['description']):
                         config.set(vlan_if + ['description'], value='PPPoE link 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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/5-to-6 b/src/migration-scripts/interfaces/5-to-6
index 9d9a49c2d..44c32ba63 100755..100644
--- a/src/migration-scripts/interfaces/5-to-6
+++ b/src/migration-scripts/interfaces/5-to-6
@@ -1,23 +1,21 @@
-#!/usr/bin/env python3
+# Copyright 202-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020-2021 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/>.
 
 # Migrate IPv6 router advertisments from a nested interface configuration to
 # a denested "service router-advert"
 
-import sys
 from vyos.configtree import ConfigTree
 
 def copy_rtradv(c, old_base, interface):
@@ -97,17 +95,7 @@ def copy_rtradv(c, old_base, interface):
             if tmp == '0':
                 c.delete(new_base + ['link-mtu'])
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        exit(1)
-
-    file_name = sys.argv[1]
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
-
+def migrate(config: ConfigTree) -> None:
     # list all individual interface types like dummy, ethernet and so on
     for if_type in config.list_nodes(['interfaces']):
         base_if_type = ['interfaces', if_type]
@@ -124,10 +112,3 @@ if __name__ == '__main__':
                     old_base = vif_base + [vif, 'ipv6', 'router-advert']
                     vlan_name = f'{intf}.{vif}'
                     copy_rtradv(config, old_base, vlan_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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/6-to-7 b/src/migration-scripts/interfaces/6-to-7
index 49b853d90..e60121eec 100755..100644
--- a/src/migration-scripts/interfaces/6-to-7
+++ b/src/migration-scripts/interfaces/6-to-7
@@ -1,39 +1,28 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # Remove network provider name from CLI and rather use provider APN from CLI
 
-import sys
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    if len(sys.argv) < 2:
-        print("Must specify file name!")
-        exit(1)
-
-    file_name = sys.argv[1]
-    with open(file_name, 'r') as f:
-        config_file = f.read()
-
-    config = ConfigTree(config_file)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'wirelessmodem']
 
     if not config.exists(base):
         # Nothing to do
-        sys.exit(0)
+        return
 
     # list all individual wwan/wireless modem interfaces
     for i in config.list_nodes(base):
@@ -54,10 +43,3 @@ if __name__ == '__main__':
         # uniform CLI experience
         if config.exists(iface + ['no-dns']):
             config.rename(iface + ['no-dns'], 'no-peer-dns')
-
-    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))
-        sys.exit(1)
diff --git a/src/migration-scripts/interfaces/7-to-8 b/src/migration-scripts/interfaces/7-to-8
index 9343a48a8..43ae320ab 100755..100644
--- a/src/migration-scripts/interfaces/7-to-8
+++ b/src/migration-scripts/interfaces/7-to-8
@@ -1,25 +1,23 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020-2023 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/>.
 
 # Split WireGuard endpoint into address / port nodes to make use of common
 # validators
 
 import os
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 from vyos.utils.permission import chown
 from vyos.utils.permission import chmod_750
@@ -36,23 +34,14 @@ def migrate_default_keys():
         os.rename(f'{kdir}/private.key', f'{location}/private.key')
         os.rename(f'{kdir}/public.key', f'{location}/public.key')
 
-if __name__ == '__main__':
-    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)
+def migrate(config: ConfigTree) -> None:
     base = ['interfaces', 'wireguard']
 
     migrate_default_keys()
 
     if not config.exists(base):
         # Nothing to do
-        exit(0)
+        return
 
     # list all individual wireguard interface isntance
     for i in config.list_nodes(base):
@@ -68,10 +57,3 @@ if __name__ == '__main__':
                 # setup new nodes
                 config.set(base_peer + ['address'], value=address)
                 config.set(base_peer + ['port'], value=port)
-
-    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)
diff --git a/src/migration-scripts/interfaces/8-to-9 b/src/migration-scripts/interfaces/8-to-9
index 960962be7..bae1b34fa 100755..100644
--- a/src/migration-scripts/interfaces/8-to-9
+++ b/src/migration-scripts/interfaces/8-to-9
@@ -1,37 +1,25 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # Rename link nodes to source-interface for the following interface types:
 # - vxlan
 # - pseudo-ethernet
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     for if_type in ['vxlan', 'pseudo-ethernet']:
         base = ['interfaces', if_type]
         if not config.exists(base):
@@ -43,10 +31,3 @@ if __name__ == '__main__':
             iface = base + [i]
             if config.exists(iface + ['link']):
                 config.rename(iface + ['link'], 'source-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)
diff --git a/src/migration-scripts/interfaces/9-to-10 b/src/migration-scripts/interfaces/9-to-10
index e9b8cb784..cdfd7d432 100755..100644
--- a/src/migration-scripts/interfaces/9-to-10
+++ b/src/migration-scripts/interfaces/9-to-10
@@ -1,38 +1,26 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020 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/>.
 
 # - rename CLI node 'dhcpv6-options delgate' to 'dhcpv6-options prefix-delegation
 #   interface'
 # - rename CLI node 'interface-id' for prefix-delegation to 'address' as it
 #   represents the local interface IPv6 address assigned by DHCPv6-PD
 
-from sys import exit, argv
 from vyos.configtree import ConfigTree
 
-if __name__ == '__main__':
-    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)
-
+def migrate(config: ConfigTree) -> None:
     for intf_type in config.list_nodes(['interfaces']):
         for intf in config.list_nodes(['interfaces', intf_type]):
             # cache current config tree
@@ -55,10 +43,3 @@ if __name__ == '__main__':
 
                 # delete old noe
                 config.delete(base_path)
-
-    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)