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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

5 files changed, 154 insertions, 257 deletions

diff --git a/src/migration-scripts/bgp/0-to-1 b/src/migration-scripts/bgp/0-to-1
index 5b8e8a163..a2f3343d8 100755..100644
--- a/src/migration-scripts/bgp/0-to-1
+++ b/src/migration-scripts/bgp/0-to-1
@@ -1,60 +1,40 @@
-#!/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/>.
 
 # T3417: migrate BGP tagNode to node as we can only have one BGP process
 
-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) or not config.is_tag(base):
-    # Nothing to do
-    exit(0)
+def migrate(config: ConfigTree) -> None:
+    base = ['protocols', 'bgp']
 
-# Only one BGP process is supported, thus this operation is savea
-asn = config.list_nodes(base)
-bgp_base = base + asn
+    if not config.exists(base) or not config.is_tag(base):
+        # Nothing to do
+        return
 
-# We need a temporary copy of the config
-tmp_base = ['protocols', 'bgp2']
-config.copy(bgp_base, tmp_base)
+    # Only one BGP process is supported, thus this operation is savea
+    asn = config.list_nodes(base)
+    bgp_base = base + asn
 
-# Now it's save to delete the old configuration
-config.delete(base)
+    # We need a temporary copy of the config
+    tmp_base = ['protocols', 'bgp2']
+    config.copy(bgp_base, tmp_base)
 
-# Rename temporary copy to new final config and set new "local-as" option
-config.rename(tmp_base, 'bgp')
-config.set(base + ['local-as'], value=asn[0])
+    # Now it's save to delete the old configuration
+    config.delete(base)
 
-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)
+    # Rename temporary copy to new final config and set new "local-as" option
+    config.rename(tmp_base, 'bgp')
+    config.set(base + ['local-as'], value=asn[0])
diff --git a/src/migration-scripts/bgp/1-to-2 b/src/migration-scripts/bgp/1-to-2
index a40d86e67..c0fc3b05a 100755..100644
--- a/src/migration-scripts/bgp/1-to-2
+++ b/src/migration-scripts/bgp/1-to-2
@@ -1,84 +1,64 @@
-#!/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/>.
 
 # T3741: no-ipv4-unicast is now enabled by default
 # T5937: Migrate IPv6 BGP Neighbor Peer Groups
 
-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]
+base = ['protocols', 'bgp']
 
-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
 
-base = ['protocols', 'bgp']
-config = ConfigTree(config_file)
+    # This is now a default option - simply delete it.
+    # As it was configured explicitly - we can also bail out early as we need to
+    # do nothing!
+    if config.exists(base + ['parameters', 'default', 'no-ipv4-unicast']):
+        config.delete(base + ['parameters', 'default', 'no-ipv4-unicast'])
 
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
+        # Check if the "default" node is now empty, if so - remove it
+        if len(config.list_nodes(base + ['parameters', 'default'])) == 0:
+            config.delete(base + ['parameters', 'default'])
 
-# This is now a default option - simply delete it.
-# As it was configured explicitly - we can also bail out early as we need to
-# do nothing!
-if config.exists(base + ['parameters', 'default', 'no-ipv4-unicast']):
-    config.delete(base + ['parameters', 'default', 'no-ipv4-unicast'])
+        # Check if the "default" node is now empty, if so - remove it
+        if len(config.list_nodes(base + ['parameters'])) == 0:
+            config.delete(base + ['parameters'])
+    else:
+        # As we now install a new default option into BGP we need to migrate all
+        # existing BGP neighbors and restore the old behavior
+        if config.exists(base + ['neighbor']):
+            for neighbor in config.list_nodes(base + ['neighbor']):
+                peer_group = base + ['neighbor', neighbor, 'peer-group']
+                if config.exists(peer_group):
+                    peer_group_name = config.return_value(peer_group)
+                    # peer group enables old behavior for neighbor - bail out
+                    if config.exists(base + ['peer-group', peer_group_name, 'address-family', 'ipv4-unicast']):
+                        continue
 
-    # Check if the "default" node is now empty, if so - remove it
-    if len(config.list_nodes(base + ['parameters', 'default'])) == 0:
-        config.delete(base + ['parameters', 'default'])
+                afi_ipv4 = base + ['neighbor', neighbor, 'address-family', 'ipv4-unicast']
+                if not config.exists(afi_ipv4):
+                    config.set(afi_ipv4)
 
-    # Check if the "default" node is now empty, if so - remove it
-    if len(config.list_nodes(base + ['parameters'])) == 0:
-        config.delete(base + ['parameters'])
-else:
-    # As we now install a new default option into BGP we need to migrate all
-    # existing BGP neighbors and restore the old behavior
+    # Migrate IPv6 AFI peer-group
     if config.exists(base + ['neighbor']):
         for neighbor in config.list_nodes(base + ['neighbor']):
-            peer_group = base + ['neighbor', neighbor, 'peer-group']
-            if config.exists(peer_group):
-                peer_group_name = config.return_value(peer_group)
-                # peer group enables old behavior for neighbor - bail out
-                if config.exists(base + ['peer-group', peer_group_name, 'address-family', 'ipv4-unicast']):
-                    continue
-
-            afi_ipv4 = base + ['neighbor', neighbor, 'address-family', 'ipv4-unicast']
-            if not config.exists(afi_ipv4):
-                config.set(afi_ipv4)
-
-# Migrate IPv6 AFI peer-group
-if config.exists(base + ['neighbor']):
-    for neighbor in config.list_nodes(base + ['neighbor']):
-        tmp_path = base + ['neighbor', neighbor, 'address-family', 'ipv6-unicast', 'peer-group']
-        if config.exists(tmp_path):
-            peer_group = config.return_value(tmp_path)
-            config.set(base + ['neighbor', neighbor, 'peer-group'], value=peer_group)
-            config.delete(tmp_path)
-
-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)
+            tmp_path = base + ['neighbor', neighbor, 'address-family', 'ipv6-unicast', 'peer-group']
+            if config.exists(tmp_path):
+                peer_group = config.return_value(tmp_path)
+                config.set(base + ['neighbor', neighbor, 'peer-group'], value=peer_group)
+                config.delete(tmp_path)
diff --git a/src/migration-scripts/bgp/2-to-3 b/src/migration-scripts/bgp/2-to-3
index 34d321a96..d8bc34db6 100755..100644
--- a/src/migration-scripts/bgp/2-to-3
+++ b/src/migration-scripts/bgp/2-to-3
@@ -1,51 +1,30 @@
-#!/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/>.
 
 # T4257: Discussion on changing BGP autonomous system number syntax
 
-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)
-
-# Check if BGP is even configured. Then check if local-as exists, then add the system-as, then remove the local-as. This is for global configuration.
-if config.exists(['protocols', 'bgp']):
-    if config.exists(['protocols', 'bgp', 'local-as']):
-        config.rename(['protocols', 'bgp', 'local-as'], 'system-as')
-
-# Check if vrf names are configured. Then check if local-as exists inside of a name, then add the system-as, then remove the local-as. This is for vrf configuration.
-if config.exists(['vrf', 'name']):
-    for vrf in config.list_nodes(['vrf', 'name']):
-        if config.exists(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as']):
-            config.rename(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as'], 'system-as')
-
-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:
+    # Check if BGP is even configured. Then check if local-as exists, then add the system-as, then remove the local-as. This is for global configuration.
+    if config.exists(['protocols', 'bgp']):
+        if config.exists(['protocols', 'bgp', 'local-as']):
+            config.rename(['protocols', 'bgp', 'local-as'], 'system-as')
+
+    # Check if vrf names are configured. Then check if local-as exists inside of a name, then add the system-as, then remove the local-as. This is for vrf configuration.
+    if config.exists(['vrf', 'name']):
+        for vrf in config.list_nodes(['vrf', 'name']):
+            if config.exists(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as']):
+                config.rename(['vrf', f'name {vrf}', 'protocols', 'bgp', 'local-as'], 'system-as')
diff --git a/src/migration-scripts/bgp/3-to-4 b/src/migration-scripts/bgp/3-to-4
index 894cdda2b..842aef0ce 100755..100644
--- a/src/migration-scripts/bgp/3-to-4
+++ b/src/migration-scripts/bgp/3-to-4
@@ -1,64 +1,43 @@
-#!/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)
-
-bgp_base = ['protocols', 'bgp']
-# Check if BGP is configured - if so, migrate the CLI node
-if config.exists(bgp_base):
-    if config.exists(bgp_base + ['route-map']):
-        tmp = config.return_value(bgp_base + ['route-map'])
-
-        config.set(['system', 'ip', 'protocol', 'bgp', 'route-map'], value=tmp)
-        config.set_tag(['system', 'ip', 'protocol'])
-        config.delete(bgp_base + ['route-map'])
-
-
-# Check if vrf names are configured. Check if BGP is configured - if so, migrate
-# the CLI node(s)
-if config.exists(['vrf', 'name']):
-    for vrf in config.list_nodes(['vrf', 'name']):
-        vrf_base = ['vrf', 'name', vrf]
-        if config.exists(vrf_base + ['protocols', 'bgp', 'route-map']):
-            tmp = config.return_value(vrf_base + ['protocols', 'bgp', 'route-map'])
-
-            config.set(vrf_base + ['ip', 'protocol', 'bgp', 'route-map'], value=tmp)
-            config.set_tag(vrf_base + ['ip', 'protocol', 'bgp'])
-            config.delete(vrf_base + ['protocols', 'bgp', '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)
+def migrate(config: ConfigTree) -> None:
+    bgp_base = ['protocols', 'bgp']
+    # Check if BGP is configured - if so, migrate the CLI node
+    if config.exists(bgp_base):
+        if config.exists(bgp_base + ['route-map']):
+            tmp = config.return_value(bgp_base + ['route-map'])
+
+            config.set(['system', 'ip', 'protocol', 'bgp', 'route-map'], value=tmp)
+            config.set_tag(['system', 'ip', 'protocol'])
+            config.delete(bgp_base + ['route-map'])
+
+
+    # Check if vrf names are configured. Check if BGP is configured - if so, migrate
+    # the CLI node(s)
+    if config.exists(['vrf', 'name']):
+        for vrf in config.list_nodes(['vrf', 'name']):
+            vrf_base = ['vrf', 'name', vrf]
+            if config.exists(vrf_base + ['protocols', 'bgp', 'route-map']):
+                tmp = config.return_value(vrf_base + ['protocols', 'bgp', 'route-map'])
+
+                config.set(vrf_base + ['ip', 'protocol', 'bgp', 'route-map'], value=tmp)
+                config.set_tag(vrf_base + ['ip', 'protocol', 'bgp'])
+                config.delete(vrf_base + ['protocols', 'bgp', 'route-map'])
diff --git a/src/migration-scripts/bgp/4-to-5 b/src/migration-scripts/bgp/4-to-5
index c4eb9ec72..d779eb11e 100755..100644
--- a/src/migration-scripts/bgp/4-to-5
+++ b/src/migration-scripts/bgp/4-to-5
@@ -1,67 +1,46 @@
-#!/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/>.
 
 # Delete 'protocols bgp address-family ipv6-unicast route-target vpn
 # import/export', if 'protocols bgp address-family ipv6-unicast
 # route-target vpn both' exists
 
-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)
-
-bgp_base = ['protocols', 'bgp']
-# Delete 'import/export' in default vrf if 'both' exists
-if config.exists(bgp_base):
-    for address_family in ['ipv4-unicast', 'ipv6-unicast']:
-        rt_path = bgp_base + ['address-family', address_family, 'route-target',
-                              'vpn']
-        if config.exists(rt_path + ['both']):
-            if config.exists(rt_path + ['import']):
-                config.delete(rt_path + ['import'])
-            if config.exists(rt_path + ['export']):
-                config.delete(rt_path + ['export'])
-
-# Delete import/export in vrfs if both exists
-if config.exists(['vrf', 'name']):
-    for vrf in config.list_nodes(['vrf', 'name']):
-        vrf_base = ['vrf', 'name', vrf]
+def migrate(config: ConfigTree) -> None:
+    bgp_base = ['protocols', 'bgp']
+    # Delete 'import/export' in default vrf if 'both' exists
+    if config.exists(bgp_base):
         for address_family in ['ipv4-unicast', 'ipv6-unicast']:
-            rt_path = vrf_base + bgp_base + ['address-family', address_family,
-                                             'route-target', 'vpn']
+            rt_path = bgp_base + ['address-family', address_family, 'route-target',
+                                  'vpn']
             if config.exists(rt_path + ['both']):
                 if config.exists(rt_path + ['import']):
                     config.delete(rt_path + ['import'])
                 if config.exists(rt_path + ['export']):
                     config.delete(rt_path + ['export'])
 
-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 import/export in vrfs if both exists
+    if config.exists(['vrf', 'name']):
+        for vrf in config.list_nodes(['vrf', 'name']):
+            vrf_base = ['vrf', 'name', vrf]
+            for address_family in ['ipv4-unicast', 'ipv6-unicast']:
+                rt_path = vrf_base + bgp_base + ['address-family', address_family,
+                                                 'route-target', 'vpn']
+                if config.exists(rt_path + ['both']):
+                    if config.exists(rt_path + ['import']):
+                        config.delete(rt_path + ['import'])
+                    if config.exists(rt_path + ['export']):
+                        config.delete(rt_path + ['export'])