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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

10 files changed, 261 insertions, 440 deletions

diff --git a/src/migration-scripts/pppoe-server/0-to-1 b/src/migration-scripts/pppoe-server/0-to-1
index 4d36f8545..8c9a24fbe 100755..100644
--- a/src/migration-scripts/pppoe-server/0-to-1
+++ b/src/migration-scripts/pppoe-server/0-to-1
@@ -1,50 +1,33 @@
-#!/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/>.
 
 # Convert "service pppoe-server authentication radius-server node key"
 # to: "service pppoe-server authentication radius-server node secret"
 
-from sys import argv, 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()
-
-ctree = ConfigTree(config_file)
 base = ['service', 'pppoe-server', 'authentication', 'radius-server']
 
-if not ctree.exists(base):
-    # Nothing to do
-    exit(0)
-else:
+def migrate(ctree: ConfigTree) -> None:
+    if not ctree.exists(base):
+        # Nothing to do
+        return
+
     nodes = ctree.list_nodes(base)
     for node in nodes:
         if ctree.exists(base + [node, 'key']):
             val = ctree.return_value(base + [node, 'key'])
             ctree.set(base + [node, 'secret'], value=val, replace=False)
             ctree.delete(base + [node, 'key'])
-
-    try:
-        open(file_name,'w').write(ctree.to_string())
-    except OSError as e:
-        print("Failed to save the modified config: {}".format(e))
-        exit(1)
diff --git a/src/migration-scripts/pppoe-server/1-to-2 b/src/migration-scripts/pppoe-server/1-to-2
index b266893c0..c9c968bff 100755..100644
--- a/src/migration-scripts/pppoe-server/1-to-2
+++ b/src/migration-scripts/pppoe-server/1-to-2
@@ -1,39 +1,29 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020-2024 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/>.
 
 # change mppe node to a leaf node with value prefer
 
-from sys import argv, exit
 from vyos.configtree import ConfigTree
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
-
-file_name = argv[1]
+base = ['service', 'pppoe-server']
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-config = ConfigTree(config_file)
-base = ['service', 'pppoe-server']
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-else:
     mppe_base = base + ['ppp-options', 'mppe']
     if config.exists(mppe_base):
         # get current values
@@ -49,10 +39,3 @@ else:
             config.set(mppe_base, value='prefer')
         elif 'deny' in tmp:
             config.set(mppe_base, value='deny')
-
-    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/pppoe-server/2-to-3 b/src/migration-scripts/pppoe-server/2-to-3
index a7be060df..160cffdf8 100755..100644
--- a/src/migration-scripts/pppoe-server/2-to-3
+++ b/src/migration-scripts/pppoe-server/2-to-3
@@ -1,48 +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/>.
 
 # Convert "service pppoe-server interface ethX" to: "service pppoe-server interface ethX {}"
 
-from sys import argv, 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()
-
-ctree = ConfigTree(config_file)
 cbase = ['service', 'pppoe-server','interface']
 
-if not ctree.exists(cbase):
-    exit(0)
-else:
+def migrate(ctree: ConfigTree) -> None:
+    if not ctree.exists(cbase):
+        return
+
     nics = ctree.return_values(cbase)
     # convert leafNode to a tagNode
     ctree.set(cbase)
     ctree.set_tag(cbase)
     for nic in nics:
         ctree.set(cbase + [nic])
-
-    try:
-        open(file_name,'w').write(ctree.to_string())
-    except OSError as e:
-        print("Failed to save the modified config: {}".format(e))
-        exit(1)
diff --git a/src/migration-scripts/pppoe-server/3-to-4 b/src/migration-scripts/pppoe-server/3-to-4
index 477ed6f22..29dd62201 100755..100644
--- a/src/migration-scripts/pppoe-server/3-to-4
+++ b/src/migration-scripts/pppoe-server/3-to-4
@@ -1,39 +1,28 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2020-2024 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/>.
 
 # - remove primary/secondary identifier from nameserver
 
-from sys import argv, exit
 from vyos.configtree import ConfigTree
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
-
-file_name = argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
 base = ['service', 'pppoe-server']
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-else:
+
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
     # Migrate IPv4 DNS servers
     dns_base = base + ['dns-servers']
@@ -130,10 +119,3 @@ else:
             prefix = p.split(',')[0]
             mask = p.split(',')[1]
             config.set(ipv6_base + ['delegate', prefix, 'delegation-prefix'], value=mask)
-
-    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/pppoe-server/4-to-5 b/src/migration-scripts/pppoe-server/4-to-5
index 5850db673..03fbfb247 100755..100644
--- a/src/migration-scripts/pppoe-server/4-to-5
+++ b/src/migration-scripts/pppoe-server/4-to-5
@@ -1,49 +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/>.
 
 # - rename local-ip to gateway-address
 
 from vyos.configtree import ConfigTree
-from sys import argv
-from sys import exit
-
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
 
-file_name = argv[1]
+base_path = ['service', 'pppoe-server']
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base_path):
+        # Nothing to do
+        return
 
-config = ConfigTree(config_file)
-base_path = ['service', 'pppoe-server']
-if not config.exists(base_path):
-    # Nothing to do
-    exit(0)
-else:
     config_gw = base_path + ['local-ip']
     if config.exists(config_gw):
         config.rename(config_gw, 'gateway-address')
         config.delete(config_gw)
-
-    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/pppoe-server/5-to-6 b/src/migration-scripts/pppoe-server/5-to-6
index e079ae684..13de8f8d2 100755..100644
--- a/src/migration-scripts/pppoe-server/5-to-6
+++ b/src/migration-scripts/pppoe-server/5-to-6
@@ -1,52 +1,33 @@
-#!/usr/bin/env python3
+# Copyright 2022-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2022 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/>.
 
 # - T4703: merge vlan-id and vlan-range to vlan CLI node
 
 from vyos.configtree import ConfigTree
-from sys import argv
-from sys import exit
-
-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_path = ['service', 'pppoe-server', 'interface']
-if not config.exists(base_path):
-    # Nothing to do
-    exit(0)
-
-for interface in config.list_nodes(base_path):
-    for vlan in ['vlan-id', 'vlan-range']:
-        if config.exists(base_path + [interface, vlan]):
-            print(interface, vlan)
-            for tmp in config.return_values(base_path + [interface, vlan]):
-                config.set(base_path + [interface, 'vlan'], value=tmp, replace=False)
-            config.delete(base_path + [interface, vlan])
-
-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_path):
+        # Nothing to do
+        return
+
+    for interface in config.list_nodes(base_path):
+        for vlan in ['vlan-id', 'vlan-range']:
+            if config.exists(base_path + [interface, vlan]):
+                print(interface, vlan)
+                for tmp in config.return_values(base_path + [interface, vlan]):
+                    config.set(base_path + [interface, 'vlan'], value=tmp, replace=False)
+                config.delete(base_path + [interface, vlan])
diff --git a/src/migration-scripts/pppoe-server/6-to-7 b/src/migration-scripts/pppoe-server/6-to-7
index d51c1c9d8..79745a0c6 100755..100644
--- a/src/migration-scripts/pppoe-server/6-to-7
+++ b/src/migration-scripts/pppoe-server/6-to-7
@@ -1,18 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023-2024 VyOS maintainers and contributors
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License version 2 or later as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
+# This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
 #
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 # - move all pool to named pools
 #       'start-stop' migrate to namedpool 'default-range-pool'
@@ -24,94 +23,77 @@
 #       If there are not named pools, namedless pool will be default.
 #       2. If authentication mode = 'radius' then namedless pool will be default
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 from vyos.base import Warning
 
-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 = ['service', 'pppoe-server']
 pool_base = base + ['client-ip-pool']
-if not config.exists(base):
-    exit(0)
-
-if not config.exists(pool_base):
-    exit(0)
-
-default_pool = ''
-range_pool_name = 'default-range-pool'
-
-#Default nameless pools migrations
-if config.exists(pool_base + ['start']) and config.exists(pool_base + ['stop']):
-    def is_legalrange(ip1: str, ip2: str, mask: str):
-        from ipaddress import IPv4Interface
-        interface1 = IPv4Interface(f'{ip1}/{mask}')
-        interface2 = IPv4Interface(f'{ip2}/{mask}')
-        return interface1.network.network_address == interface2.network.network_address and interface2.ip > interface1.ip
 
-    start_ip = config.return_value(pool_base + ['start'])
-    stop_ip = config.return_value(pool_base + ['stop'])
-    if is_legalrange(start_ip, stop_ip, '24'):
-        ip_range = f'{start_ip}-{stop_ip}'
-        config.set(pool_base + [range_pool_name, 'range'], value=ip_range, replace=False)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        return
+
+    if not config.exists(pool_base):
+        return
+
+    default_pool = ''
+    range_pool_name = 'default-range-pool'
+
+    #Default nameless pools migrations
+    if config.exists(pool_base + ['start']) and config.exists(pool_base + ['stop']):
+        def is_legalrange(ip1: str, ip2: str, mask: str):
+            from ipaddress import IPv4Interface
+            interface1 = IPv4Interface(f'{ip1}/{mask}')
+            interface2 = IPv4Interface(f'{ip2}/{mask}')
+            return interface1.network.network_address == interface2.network.network_address and interface2.ip > interface1.ip
+
+        start_ip = config.return_value(pool_base + ['start'])
+        stop_ip = config.return_value(pool_base + ['stop'])
+        if is_legalrange(start_ip, stop_ip, '24'):
+            ip_range = f'{start_ip}-{stop_ip}'
+            config.set(pool_base + [range_pool_name, 'range'], value=ip_range, replace=False)
+            default_pool = range_pool_name
+        else:
+            Warning(
+                f'PPPoE client-ip-pool range start-ip:{start_ip} and stop-ip:{stop_ip} can not be migrated.')
+        config.delete(pool_base + ['start'])
+        config.delete(pool_base + ['stop'])
+
+    if config.exists(pool_base + ['subnet']):
         default_pool = range_pool_name
-    else:
-        Warning(
-            f'PPPoE client-ip-pool range start-ip:{start_ip} and stop-ip:{stop_ip} can not be migrated.')
-    config.delete(pool_base + ['start'])
-    config.delete(pool_base + ['stop'])
-
-if config.exists(pool_base + ['subnet']):
-    default_pool = range_pool_name
-    for subnet in config.return_values(pool_base + ['subnet']):
-        config.set(pool_base + [range_pool_name, 'range'], value=subnet, replace=False)
-    config.delete(pool_base + ['subnet'])
-
-gateway = ''
-if config.exists(base + ['gateway-address']):
-    gateway = config.return_value(base + ['gateway-address'])
-
-#named pool migration
-namedpools_base = pool_base + ['name']
-if config.exists(namedpools_base):
-    if config.exists(base + ['authentication', 'mode']):
-        if config.return_value(base + ['authentication', 'mode']) == 'local':
-            if config.list_nodes(namedpools_base):
-                default_pool = config.list_nodes(namedpools_base)[0]
-
-    for pool_name in config.list_nodes(namedpools_base):
-        pool_path = namedpools_base + [pool_name]
-        if config.exists(pool_path + ['subnet']):
-            subnet = config.return_value(pool_path + ['subnet'])
-            config.set(pool_base + [pool_name, 'range'], value=subnet, replace=False)
-        if config.exists(pool_path + ['next-pool']):
-            next_pool = config.return_value(pool_path + ['next-pool'])
-            config.set(pool_base + [pool_name, 'next-pool'], value=next_pool)
-        if not gateway:
-            if config.exists(pool_path + ['gateway-address']):
-                gateway = config.return_value(pool_path + ['gateway-address'])
-
-    config.delete(namedpools_base)
-
-if gateway:
-    config.set(base + ['gateway-address'], value=gateway)
-if default_pool:
-    config.set(base + ['default-pool'], value=default_pool)
-# format as tag node
-config.set_tag(pool_base)
-
-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 subnet in config.return_values(pool_base + ['subnet']):
+            config.set(pool_base + [range_pool_name, 'range'], value=subnet, replace=False)
+        config.delete(pool_base + ['subnet'])
+
+    gateway = ''
+    if config.exists(base + ['gateway-address']):
+        gateway = config.return_value(base + ['gateway-address'])
+
+    #named pool migration
+    namedpools_base = pool_base + ['name']
+    if config.exists(namedpools_base):
+        if config.exists(base + ['authentication', 'mode']):
+            if config.return_value(base + ['authentication', 'mode']) == 'local':
+                if config.list_nodes(namedpools_base):
+                    default_pool = config.list_nodes(namedpools_base)[0]
+
+        for pool_name in config.list_nodes(namedpools_base):
+            pool_path = namedpools_base + [pool_name]
+            if config.exists(pool_path + ['subnet']):
+                subnet = config.return_value(pool_path + ['subnet'])
+                config.set(pool_base + [pool_name, 'range'], value=subnet, replace=False)
+            if config.exists(pool_path + ['next-pool']):
+                next_pool = config.return_value(pool_path + ['next-pool'])
+                config.set(pool_base + [pool_name, 'next-pool'], value=next_pool)
+            if not gateway:
+                if config.exists(pool_path + ['gateway-address']):
+                    gateway = config.return_value(pool_path + ['gateway-address'])
+
+        config.delete(namedpools_base)
+
+    if gateway:
+        config.set(base + ['gateway-address'], value=gateway)
+    if default_pool:
+        config.set(base + ['default-pool'], value=default_pool)
+    # format as tag node
+    config.set_tag(pool_base)
diff --git a/src/migration-scripts/pppoe-server/7-to-8 b/src/migration-scripts/pppoe-server/7-to-8
index 0381f0bf9..90e4fa053 100755..100644
--- a/src/migration-scripts/pppoe-server/7-to-8
+++ b/src/migration-scripts/pppoe-server/7-to-8
@@ -1,58 +1,40 @@
-#!/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/>.
 
 # Migrating to named ipv6 pools
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
+base = ['service', 'pppoe-server']
+pool_base = base + ['client-ipv6-pool']
 
-file_name = argv[1]
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        return
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
+    if not config.exists(pool_base):
+        return
 
-config = ConfigTree(config_file)
-base = ['service', 'pppoe-server']
-pool_base = base + ['client-ipv6-pool']
-if not config.exists(base):
-    exit(0)
-
-if not config.exists(pool_base):
-    exit(0)
-
-ipv6_pool_name = 'ipv6-pool'
-config.copy(pool_base, pool_base + [ipv6_pool_name])
-
-if config.exists(pool_base + ['prefix']):
-    config.delete(pool_base + ['prefix'])
-    config.set(base + ['default-ipv6-pool'], value=ipv6_pool_name)
-if config.exists(pool_base + ['delegate']):
-    config.delete(pool_base + ['delegate'])
-
-# format as tag node
-config.set_tag(pool_base)
-
-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)
+    ipv6_pool_name = 'ipv6-pool'
+    config.copy(pool_base, pool_base + [ipv6_pool_name])
+
+    if config.exists(pool_base + ['prefix']):
+        config.delete(pool_base + ['prefix'])
+        config.set(base + ['default-ipv6-pool'], value=ipv6_pool_name)
+    if config.exists(pool_base + ['delegate']):
+        config.delete(pool_base + ['delegate'])
+
+    # format as tag node
+    config.set_tag(pool_base)
diff --git a/src/migration-scripts/pppoe-server/8-to-9 b/src/migration-scripts/pppoe-server/8-to-9
index 4932a766f..e7e0aaa2c 100755..100644
--- a/src/migration-scripts/pppoe-server/8-to-9
+++ b/src/migration-scripts/pppoe-server/8-to-9
@@ -1,66 +1,48 @@
-#!/usr/bin/env python3
+# Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2024 VyOS maintainers and contributors
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License version 2 or later as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
+# This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
 #
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 # Change from 'ccp' to 'disable-ccp' in ppp-option section
 # Migration ipv6 options
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
-
-file_name = argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
 base = ['service', 'pppoe-server']
-if not config.exists(base):
-    exit(0)
-
-#CCP migration
-if config.exists(base + ['ppp-options', 'ccp']):
-    config.delete(base + ['ppp-options', 'ccp'])
-else:
-    config.set(base + ['ppp-options', 'disable-ccp'])
-
-#IPV6 options migrations
-if config.exists(base + ['ppp-options','ipv6-peer-intf-id']):
-    intf_peer_id = config.return_value(base + ['ppp-options','ipv6-peer-intf-id'])
-    if intf_peer_id == 'ipv4':
-        intf_peer_id = 'ipv4-addr'
-    config.set(base + ['ppp-options','ipv6-peer-interface-id'], value=intf_peer_id, replace=True)
-    config.delete(base + ['ppp-options','ipv6-peer-intf-id'])
-
-if config.exists(base + ['ppp-options','ipv6-intf-id']):
-    intf_id = config.return_value(base + ['ppp-options','ipv6-intf-id'])
-    config.set(base + ['ppp-options','ipv6-interface-id'], value=intf_id, replace=True)
-    config.delete(base + ['ppp-options','ipv6-intf-id'])
-
-if config.exists(base + ['ppp-options','ipv6-accept-peer-intf-id']):
-    config.set(base + ['ppp-options','ipv6-accept-peer-interface-id'])
-    config.delete(base + ['ppp-options','ipv6-accept-peer-intf-id'])
 
-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
+
+    #CCP migration
+    if config.exists(base + ['ppp-options', 'ccp']):
+        config.delete(base + ['ppp-options', 'ccp'])
+    else:
+        config.set(base + ['ppp-options', 'disable-ccp'])
+
+    #IPV6 options migrations
+    if config.exists(base + ['ppp-options','ipv6-peer-intf-id']):
+        intf_peer_id = config.return_value(base + ['ppp-options','ipv6-peer-intf-id'])
+        if intf_peer_id == 'ipv4':
+            intf_peer_id = 'ipv4-addr'
+        config.set(base + ['ppp-options','ipv6-peer-interface-id'], value=intf_peer_id, replace=True)
+        config.delete(base + ['ppp-options','ipv6-peer-intf-id'])
+
+    if config.exists(base + ['ppp-options','ipv6-intf-id']):
+        intf_id = config.return_value(base + ['ppp-options','ipv6-intf-id'])
+        config.set(base + ['ppp-options','ipv6-interface-id'], value=intf_id, replace=True)
+        config.delete(base + ['ppp-options','ipv6-intf-id'])
+
+    if config.exists(base + ['ppp-options','ipv6-accept-peer-intf-id']):
+        config.set(base + ['ppp-options','ipv6-accept-peer-interface-id'])
+        config.delete(base + ['ppp-options','ipv6-accept-peer-intf-id'])
diff --git a/src/migration-scripts/pppoe-server/9-to-10 b/src/migration-scripts/pppoe-server/9-to-10
index e0c782f04..d3475e8ff 100755..100644
--- a/src/migration-scripts/pppoe-server/9-to-10
+++ b/src/migration-scripts/pppoe-server/9-to-10
@@ -1,56 +1,38 @@
-#!/usr/bin/env python3
+# Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2024 VyOS maintainers and contributors
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License version 2 or later as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
+# This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
 #
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 # Migration of pado-delay options
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
-
-file_name = argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
 base = ['service', 'pppoe-server', 'pado-delay']
-if not config.exists(base):
-    exit(0)
 
-pado_delay = {}
-for delay in config.list_nodes(base):
-    sessions = config.return_value(base + [delay, 'sessions'])
-    pado_delay[delay] = sessions
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        return
 
-# need to define delay for latest sessions
-sorted_delays = dict(sorted(pado_delay.items(), key=lambda k_v: int(k_v[1])))
-last_delay = list(sorted_delays)[-1]
+    pado_delay = {}
+    for delay in config.list_nodes(base):
+        sessions = config.return_value(base + [delay, 'sessions'])
+        pado_delay[delay] = sessions
 
-# Rename last delay -> disable
-tmp = base + [last_delay]
-if config.exists(tmp):
-    config.rename(tmp, 'disable')
+    # need to define delay for latest sessions
+    sorted_delays = dict(sorted(pado_delay.items(), key=lambda k_v: int(k_v[1])))
+    last_delay = list(sorted_delays)[-1]
 
-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)
+    # Rename last delay -> disable
+    tmp = base + [last_delay]
+    if config.exists(tmp):
+        config.rename(tmp, 'disable')