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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

9 files changed, 261 insertions, 451 deletions

diff --git a/src/migration-scripts/quagga/10-to-11 b/src/migration-scripts/quagga/10-to-11
index 0ed4f5df6..15dbbb193 100755..100644
--- a/src/migration-scripts/quagga/10-to-11
+++ b/src/migration-scripts/quagga/10-to-11
@@ -1,51 +1,31 @@
-#!/usr/bin/env python3
+# Copyright 2023-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2023 VyOS maintainers and contributors
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License version 2 or later as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
+# This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
 #
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 # T5150: Rework CLI definitions to apply route-maps between routing daemons
 #        and zebra/kernel
 
-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)
-
 static_base = ['protocols', 'static']
-# Check if static routes are configured - if so, migrate the CLI node
-if config.exists(static_base):
-    if config.exists(static_base + ['route-map']):
-        tmp = config.return_value(static_base + ['route-map'])
 
-        config.set(['system', 'ip', 'protocol', 'static', 'route-map'], value=tmp)
-        config.set_tag(['system', 'ip', 'protocol'])
-        config.delete(static_base + ['route-map'])
+def migrate(config: ConfigTree) -> None:
+    # Check if static routes are configured - if so, migrate the CLI node
+    if config.exists(static_base):
+        if config.exists(static_base + ['route-map']):
+            tmp = config.return_value(static_base + ['route-map'])
 
-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)
+            config.set(['system', 'ip', 'protocol', 'static', 'route-map'], value=tmp)
+            config.set_tag(['system', 'ip', 'protocol'])
+            config.delete(static_base + ['route-map'])
diff --git a/src/migration-scripts/quagga/2-to-3 b/src/migration-scripts/quagga/2-to-3
index 96b56da70..d62c387ba 100755..100644
--- a/src/migration-scripts/quagga/2-to-3
+++ b/src/migration-scripts/quagga/2-to-3
@@ -1,37 +1,21 @@
-#!/usr/bin/env python3
+# Copyright 2018-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2018 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.
 #
-
-import sys
+# 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 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)
-
 def migrate_neighbor(config, neighbor_path, neighbor):
     if config.exists(neighbor_path):
         neighbors = config.list_nodes(neighbor_path)
@@ -117,10 +101,11 @@ def migrate_neighbor(config, neighbor_path, neighbor):
                 config.delete(neighbor_path + [neighbor, 'disable-send-community'])
 
 
-if not config.exists(['protocols', 'bgp']):
-    # Nothing to do
-    sys.exit(0)
-else:
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['protocols', 'bgp']):
+        # Nothing to do
+        return
+
     # Just to avoid writing it so many times
     af_path = ['address-family', 'ipv4-unicast']
 
@@ -132,7 +117,7 @@ else:
         bgp_path = ['protocols', 'bgp', asn]
     else:
         # There's actually no BGP, just its empty shell
-        sys.exit(0)
+        return
 
     ## Move global IPv4-specific BGP options to "address-family ipv4-unicast"
 
@@ -194,10 +179,3 @@ else:
                 config.set(bgp_path + af_path + ['redistribute', redistribute, 'route-map'], value=redist_route_map)
 
         config.delete(redistribute_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))
-        sys.exit(1)
diff --git a/src/migration-scripts/quagga/3-to-4 b/src/migration-scripts/quagga/3-to-4
index 1e8c8e2f2..81cf139f6 100755..100644
--- a/src/migration-scripts/quagga/3-to-4
+++ b/src/migration-scripts/quagga/3-to-4
@@ -1,20 +1,17 @@
-#!/usr/bin/env python3
+# Copyright 2019-2024 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.
-#
-# 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/>.
 
 # Between 1.2.3 and 1.2.4, FRR added per-neighbor enforce-first-as option.
 # Unfortunately they also removed the global enforce-first-as option,
@@ -23,26 +20,14 @@
 # To emulate the effect of the original option, we insert it in every neighbor
 # if the config used to have the original global option
 
-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]
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['protocols', 'bgp']):
+        # Nothing to do
+        return
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
-
-if not config.exists(['protocols', 'bgp']):
-    # Nothing to do
-    sys.exit(0)
-else:
     # Check if BGP is actually configured and obtain the ASN
     asn_list = config.list_nodes(['protocols', 'bgp'])
     if asn_list:
@@ -50,7 +35,7 @@ else:
         asn = asn_list[0]
     else:
         # There's actually no BGP, just its empty shell
-        sys.exit(0)
+        return
 
     # Check if BGP enforce-first-as option is set
     enforce_first_as_path = ['protocols', 'bgp', asn, 'parameters', 'enforce-first-as']
@@ -64,13 +49,4 @@ else:
             config.set(['protocols', 'bgp', asn, 'neighbor', p, 'enforce-first-as'])
     else:
         # Do nothing
-        sys.exit(0)
-
-    # Save a new configuration 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)
-
+        return
diff --git a/src/migration-scripts/quagga/4-to-5 b/src/migration-scripts/quagga/4-to-5
index fcb496a9c..27b995431 100755..100644
--- a/src/migration-scripts/quagga/4-to-5
+++ b/src/migration-scripts/quagga/4-to-5
@@ -1,41 +1,26 @@
-#!/usr/bin/env python3
+# Copyright 2020-2024 VyOS maintainers and contributors <maintainers@vyos.io>
 #
-# Copyright (C) 2019 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.
 #
-#
-
-import sys
+# 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 vyos.configtree import ConfigTree
 
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['protocols', 'bgp']):
+        # Nothing to do
+        return
 
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
-
-if not config.exists(['protocols', 'bgp']):
-    # Nothing to do
-    sys.exit(0)
-else:
     # Check if BGP is actually configured and obtain the ASN
     asn_list = config.list_nodes(['protocols', 'bgp'])
     if asn_list:
@@ -43,7 +28,7 @@ else:
         asn = asn_list[0]
     else:
         # There's actually no BGP, just its empty shell
-        sys.exit(0)
+        return
 
     # Check if BGP scan-time parameter exist
     scan_time_param = ['protocols', 'bgp', asn, 'parameters', 'scan-time']
@@ -52,12 +37,4 @@ else:
         config.delete(scan_time_param)
     else:
         # Do nothing
-        sys.exit(0)
-
-    # Save a new configuration 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)
+        return
diff --git a/src/migration-scripts/quagga/5-to-6 b/src/migration-scripts/quagga/5-to-6
index f075fc2e7..08fd070de 100755..100644
--- a/src/migration-scripts/quagga/5-to-6
+++ b/src/migration-scripts/quagga/5-to-6
@@ -1,42 +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/>.
-
-# * Remove parameter 'disable-network-import-check' which, as implemented,
-#   had no effect on boot.
-
-import sys
+# 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 vyos.configtree import ConfigTree
 
 
-if len(sys.argv) < 2:
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['protocols', 'bgp']):
+        # Nothing to do
+        return
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
-config = ConfigTree(config_file)
-
-if not config.exists(['protocols', 'bgp']):
-    # Nothing to do
-    sys.exit(0)
-else:
     # Check if BGP is actually configured and obtain the ASN
     asn_list = config.list_nodes(['protocols', 'bgp'])
     if asn_list:
@@ -44,7 +28,7 @@ else:
         asn = asn_list[0]
     else:
         # There's actually no BGP, just its empty shell
-        sys.exit(0)
+        return
 
     # Check if BGP parameter disable-network-import-check exists
     param = ['protocols', 'bgp', asn, 'parameters', 'disable-network-import-check']
@@ -53,11 +37,4 @@ else:
         config.delete(param)
     else:
         # Do nothing
-        sys.exit(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)
+        return
diff --git a/src/migration-scripts/quagga/6-to-7 b/src/migration-scripts/quagga/6-to-7
index ed295a95c..095baac03 100755..100644
--- a/src/migration-scripts/quagga/6-to-7
+++ b/src/migration-scripts/quagga/6-to-7
@@ -1,116 +1,97 @@
-#!/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/>.
 
 # - T3037, BGP address-family ipv6-unicast capability dynamic does not exist in
 #   FRR, there is only a base, per neighbor dynamic capability, migrate config
 
-from sys import argv
-from sys import exit
 from vyos.configtree import ConfigTree
 from vyos.template import is_ipv4
 from vyos.template import is_ipv6
 
-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 = ['protocols', 'bgp']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-# Check if BGP is actually configured and obtain the ASN
-asn_list = config.list_nodes(base)
-if asn_list:
-    # There's always just one BGP node, if any
-    bgp_base = base + [asn_list[0]]
-
-    for neighbor_type in ['neighbor', 'peer-group']:
-        if not config.exists(bgp_base + [neighbor_type]):
-            continue
-        for neighbor in config.list_nodes(bgp_base + [neighbor_type]):
-            # T2844 - add IPv4 AFI disable-send-community support
-            send_comm_path = bgp_base + [neighbor_type, neighbor, 'disable-send-community']
-            if config.exists(send_comm_path):
-                new_base = bgp_base + [neighbor_type, neighbor, 'address-family', 'ipv4-unicast']
-                config.set(new_base)
-                config.copy(send_comm_path, new_base + ['disable-send-community'])
-                config.delete(send_comm_path)
-
-            cap_dynamic = False
-            peer_group = None
-            for afi in ['ipv4-unicast', 'ipv6-unicast']:
-                afi_path = bgp_base + [neighbor_type, neighbor, 'address-family', afi]
-                # Exit loop early if AFI does not exist
-                if not config.exists(afi_path):
-                    continue
-
-                cap_path = afi_path + ['capability', 'dynamic']
-                if config.exists(cap_path):
-                    cap_dynamic = True
-                    config.delete(cap_path)
-
-                    # We have now successfully migrated the address-family
-                    # specific dynamic capability to the neighbor/peer-group
-                    # level. If this has been the only option under the
-                    # address-family nodes, we can clean them up by checking if
-                    # no other nodes are left under that tree and if so, delete
-                    # the parent.
-                    #
-                    # We walk from the most inner node to the most outer one.
-                    cleanup = -1
-                    while len(config.list_nodes(cap_path[:cleanup])) == 0:
-                        config.delete(cap_path[:cleanup])
-                        cleanup -= 1
-
-                peer_group_path = afi_path + ['peer-group']
-                if config.exists(peer_group_path):
-                    if ((is_ipv4(neighbor) and afi == 'ipv4-unicast') or
-                        (is_ipv6(neighbor) and afi == 'ipv6-unicast')):
-                        peer_group = config.return_value(peer_group_path)
-
-                    config.delete(peer_group_path)
-
-                    # We have now successfully migrated the address-family
-                    # specific peer-group to the neighbor level. If this has
-                    # been the only option under the address-family nodes, we
-                    # can clean them up by checking if no other nodes are left
-                    # under that tree and if so, delete the parent.
-                    #
-                    # We walk from the most inner node to the most outer one.
-                    cleanup = -1
-                    while len(config.list_nodes(peer_group_path[:cleanup])) == 0:
-                        config.delete(peer_group_path[:cleanup])
-                        cleanup -= 1
-
-            if cap_dynamic:
-                config.set(bgp_base + [neighbor_type, neighbor, 'capability', 'dynamic'])
-            if peer_group:
-                config.set(bgp_base + [neighbor_type, neighbor, 'peer-group'], value=peer_group)
 
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print("Failed to save the modified config: {}".format(e))
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    # Check if BGP is actually configured and obtain the ASN
+    asn_list = config.list_nodes(base)
+    if asn_list:
+        # There's always just one BGP node, if any
+        bgp_base = base + [asn_list[0]]
+
+        for neighbor_type in ['neighbor', 'peer-group']:
+            if not config.exists(bgp_base + [neighbor_type]):
+                continue
+            for neighbor in config.list_nodes(bgp_base + [neighbor_type]):
+                # T2844 - add IPv4 AFI disable-send-community support
+                send_comm_path = bgp_base + [neighbor_type, neighbor, 'disable-send-community']
+                if config.exists(send_comm_path):
+                    new_base = bgp_base + [neighbor_type, neighbor, 'address-family', 'ipv4-unicast']
+                    config.set(new_base)
+                    config.copy(send_comm_path, new_base + ['disable-send-community'])
+                    config.delete(send_comm_path)
+
+                cap_dynamic = False
+                peer_group = None
+                for afi in ['ipv4-unicast', 'ipv6-unicast']:
+                    afi_path = bgp_base + [neighbor_type, neighbor, 'address-family', afi]
+                    # Exit loop early if AFI does not exist
+                    if not config.exists(afi_path):
+                        continue
+
+                    cap_path = afi_path + ['capability', 'dynamic']
+                    if config.exists(cap_path):
+                        cap_dynamic = True
+                        config.delete(cap_path)
+
+                        # We have now successfully migrated the address-family
+                        # specific dynamic capability to the neighbor/peer-group
+                        # level. If this has been the only option under the
+                        # address-family nodes, we can clean them up by checking if
+                        # no other nodes are left under that tree and if so, delete
+                        # the parent.
+                        #
+                        # We walk from the most inner node to the most outer one.
+                        cleanup = -1
+                        while len(config.list_nodes(cap_path[:cleanup])) == 0:
+                            config.delete(cap_path[:cleanup])
+                            cleanup -= 1
+
+                    peer_group_path = afi_path + ['peer-group']
+                    if config.exists(peer_group_path):
+                        if ((is_ipv4(neighbor) and afi == 'ipv4-unicast') or
+                            (is_ipv6(neighbor) and afi == 'ipv6-unicast')):
+                            peer_group = config.return_value(peer_group_path)
+
+                        config.delete(peer_group_path)
+
+                        # We have now successfully migrated the address-family
+                        # specific peer-group to the neighbor level. If this has
+                        # been the only option under the address-family nodes, we
+                        # can clean them up by checking if no other nodes are left
+                        # under that tree and if so, delete the parent.
+                        #
+                        # We walk from the most inner node to the most outer one.
+                        cleanup = -1
+                        while len(config.list_nodes(peer_group_path[:cleanup])) == 0:
+                            config.delete(peer_group_path[:cleanup])
+                            cleanup -= 1
+
+                if cap_dynamic:
+                    config.set(bgp_base + [neighbor_type, neighbor, 'capability', 'dynamic'])
+                if peer_group:
+                    config.set(bgp_base + [neighbor_type, neighbor, 'peer-group'], value=peer_group)
diff --git a/src/migration-scripts/quagga/7-to-8 b/src/migration-scripts/quagga/7-to-8
index 8f11bf390..d9de26d15 100755..100644
--- a/src/migration-scripts/quagga/7-to-8
+++ b/src/migration-scripts/quagga/7-to-8
@@ -1,61 +1,42 @@
-#!/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/>.
 
 # - T3391: Migrate "maximum-paths" setting from "protocols bgp asn maximum-paths"
 #   under the IPv4 address-family tree. Reason is we currently have no way in
 #   configuring this for IPv6 address-family. This mimics the FRR configuration.
 
-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 = ['protocols', 'bgp']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-# Check if BGP is actually configured and obtain the ASN
-asn_list = config.list_nodes(base)
-if asn_list:
-    # There's always just one BGP node, if any
-    bgp_base = base + [asn_list[0]]
-
-    maximum_paths = bgp_base + ['maximum-paths']
-    if config.exists(maximum_paths):
-        for bgp_type in ['ebgp', 'ibgp']:
-            if config.exists(maximum_paths + [bgp_type]):
-                new_base =  bgp_base + ['address-family', 'ipv4-unicast', 'maximum-paths']
-                config.set(new_base)
-                config.copy(maximum_paths + [bgp_type], new_base + [bgp_type])
-        config.delete(maximum_paths)
 
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print("Failed to save the modified config: {}".format(e))
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    # Check if BGP is actually configured and obtain the ASN
+    asn_list = config.list_nodes(base)
+    if asn_list:
+        # There's always just one BGP node, if any
+        bgp_base = base + [asn_list[0]]
+
+        maximum_paths = bgp_base + ['maximum-paths']
+        if config.exists(maximum_paths):
+            for bgp_type in ['ebgp', 'ibgp']:
+                if config.exists(maximum_paths + [bgp_type]):
+                    new_base =  bgp_base + ['address-family', 'ipv4-unicast', 'maximum-paths']
+                    config.set(new_base)
+                    config.copy(maximum_paths + [bgp_type], new_base + [bgp_type])
+            config.delete(maximum_paths)
diff --git a/src/migration-scripts/quagga/8-to-9 b/src/migration-scripts/quagga/8-to-9
index 0f683d5a1..eece6c15d 100755..100644
--- a/src/migration-scripts/quagga/8-to-9
+++ b/src/migration-scripts/quagga/8-to-9
@@ -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/>.
 
 # - T2450: drop interface-route and interface-route6 from "protocols static"
 
-from sys import argv
-from sys import exit
-
 from vyos.configtree import ConfigTree
 
 def migrate_interface_route(config, base, path, route_route6):
@@ -84,54 +80,38 @@ def migrate_route(config, base, path, route_route6):
                         config.rename(vrf_path, 'vrf')
 
 
-if len(argv) < 2:
-    print("Must specify file name!")
-    exit(1)
+base = ['protocols', 'static']
 
-file_name = argv[1]
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
+    # Migrate interface-route into route
+    migrate_interface_route(config, base, ['interface-route'], 'route')
 
-base = ['protocols', 'static']
+    # Migrate interface-route6 into route6
+    migrate_interface_route(config, base, ['interface-route6'], 'route6')
 
-config = ConfigTree(config_file)
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
+    # Cleanup nodes inside route
+    migrate_route(config, base, ['route'], 'route')
 
-# Migrate interface-route into route
-migrate_interface_route(config, base, ['interface-route'], 'route')
+    # Cleanup nodes inside route6
+    migrate_route(config, base, ['route6'], 'route6')
 
-# Migrate interface-route6 into route6
-migrate_interface_route(config, base, ['interface-route6'], 'route6')
+    #
+    # PBR table cleanup
+    table_path = base + ['table']
+    if config.exists(table_path):
+        for table in config.list_nodes(table_path):
+            # Migrate interface-route into route
+            migrate_interface_route(config, table_path + [table], ['interface-route'], 'route')
 
-# Cleanup nodes inside route
-migrate_route(config, base, ['route'], 'route')
+            # Migrate interface-route6 into route6
+            migrate_interface_route(config, table_path + [table], ['interface-route6'], 'route6')
 
-# Cleanup nodes inside route6
-migrate_route(config, base, ['route6'], 'route6')
+            # Cleanup nodes inside route
+            migrate_route(config, table_path + [table], ['route'], 'route')
 
-#
-# PBR table cleanup
-table_path = base + ['table']
-if config.exists(table_path):
-    for table in config.list_nodes(table_path):
-        # Migrate interface-route into route
-        migrate_interface_route(config, table_path + [table], ['interface-route'], 'route')
-
-        # Migrate interface-route6 into route6
-        migrate_interface_route(config, table_path + [table], ['interface-route6'], 'route6')
-
-        # Cleanup nodes inside route
-        migrate_route(config, table_path + [table], ['route'], 'route')
-
-        # Cleanup nodes inside route6
-        migrate_route(config, table_path + [table], ['route6'], 'route6')
-
-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)
+            # Cleanup nodes inside route6
+            migrate_route(config, table_path + [table], ['route6'], 'route6')
diff --git a/src/migration-scripts/quagga/9-to-10 b/src/migration-scripts/quagga/9-to-10
index 3731762f7..4ac1f0b7d 100755..100644
--- a/src/migration-scripts/quagga/9-to-10
+++ b/src/migration-scripts/quagga/9-to-10
@@ -1,62 +1,42 @@
-#!/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/>.
 
 # re-organize route-map as-path
 
-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 = ['policy', 'route-map']
 
-config = ConfigTree(config_file)
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-for route_map in config.list_nodes(base):
-    # Bail out Early
-    if not config.exists(base + [route_map, 'rule']):
-        continue
-
-    for rule in config.list_nodes(base + [route_map, 'rule']):
-        rule_base = base + [route_map, 'rule', rule]
-        if config.exists(rule_base + ['set', 'as-path-exclude']):
-            tmp = config.return_value(rule_base + ['set', 'as-path-exclude'])
-            config.delete(rule_base + ['set', 'as-path-exclude'])
-            config.set(rule_base + ['set', 'as-path', 'exclude'], value=tmp)
-
-        if config.exists(rule_base + ['set', 'as-path-prepend']):
-            tmp = config.return_value(rule_base + ['set', 'as-path-prepend'])
-            config.delete(rule_base + ['set', 'as-path-prepend'])
-            config.set(rule_base + ['set', 'as-path', 'prepend'], value=tmp)
-
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print("Failed to save the modified config: {}".format(e))
-    exit(1)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    for route_map in config.list_nodes(base):
+        # Bail out Early
+        if not config.exists(base + [route_map, 'rule']):
+            continue
+
+        for rule in config.list_nodes(base + [route_map, 'rule']):
+            rule_base = base + [route_map, 'rule', rule]
+            if config.exists(rule_base + ['set', 'as-path-exclude']):
+                tmp = config.return_value(rule_base + ['set', 'as-path-exclude'])
+                config.delete(rule_base + ['set', 'as-path-exclude'])
+                config.set(rule_base + ['set', 'as-path', 'exclude'], value=tmp)
+
+            if config.exists(rule_base + ['set', 'as-path-prepend']):
+                tmp = config.return_value(rule_base + ['set', 'as-path-prepend'])
+                config.delete(rule_base + ['set', 'as-path-prepend'])
+                config.set(rule_base + ['set', 'as-path', 'prepend'], value=tmp)