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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

3 files changed, 71 insertions, 130 deletions

diff --git a/src/migration-scripts/isis/0-to-1 b/src/migration-scripts/isis/0-to-1
index 0149c0c1f..e24288558 100755..100644
--- a/src/migration-scripts/isis/0-to-1
+++ b/src/migration-scripts/isis/0-to-1
@@ -1,56 +1,36 @@
-#!/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 IS-IS tagNode to node as we can only have one IS-IS 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', 'isis']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
 
-# We need a temporary copy of the config
-tmp_base = ['protocols', 'isis2']
-config.copy(base, tmp_base)
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-# Now it's save to delete the old configuration
-config.delete(base)
+    # We need a temporary copy of the config
+    tmp_base = ['protocols', 'isis2']
+    config.copy(base, tmp_base)
 
-# Rename temporary copy to new final config (IS-IS domain key is static and no
-# longer required to be set via CLI)
-config.rename(tmp_base, 'isis')
+    # 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 (IS-IS domain key is static and no
+    # longer required to be set via CLI)
+    config.rename(tmp_base, 'isis')
diff --git a/src/migration-scripts/isis/1-to-2 b/src/migration-scripts/isis/1-to-2
index 9c110bf2a..0fc92a6de 100755..100644
--- a/src/migration-scripts/isis/1-to-2
+++ b/src/migration-scripts/isis/1-to-2
@@ -1,46 +1,27 @@
-#!/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/>.
 
 # T4739 refactor, and remove "on" from segment routing from the 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()
-
-config = ConfigTree(config_file)
-
-# Check if ISIS segment routing is configured. Then check if segment routing "on" exists, then delete the "on" as it is no longer needed. This is for global configuration.
-if config.exists(['protocols', 'isis']):
-    if config.exists(['protocols', 'isis', 'segment-routing']):
-        if config.exists(['protocols', 'isis', 'segment-routing', 'enable']):
-            config.delete(['protocols', 'isis', 'segment-routing', 'enable'])
-
-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 ISIS segment routing is configured. Then check if segment
+    # routing "on" exists, then delete the "on" as it is no longer needed.
+    # This is for global configuration.
+    if config.exists(['protocols', 'isis']):
+        if config.exists(['protocols', 'isis', 'segment-routing']):
+            if config.exists(['protocols', 'isis', 'segment-routing', 'enable']):
+                config.delete(['protocols', 'isis', 'segment-routing', 'enable'])
diff --git a/src/migration-scripts/isis/2-to-3 b/src/migration-scripts/isis/2-to-3
index 78e3c1715..afb9f2340 100755..100644
--- a/src/migration-scripts/isis/2-to-3
+++ b/src/migration-scripts/isis/2-to-3
@@ -1,63 +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)
-
 isis_base = ['protocols', 'isis']
-# Check if IS-IS is configured - if so, migrate the CLI node
-if config.exists(isis_base):
-    if config.exists(isis_base + ['route-map']):
-        tmp = config.return_value(isis_base + ['route-map'])
-
-        config.set(['system', 'ip', 'protocol', 'isis', 'route-map'], value=tmp)
-        config.set_tag(['system', 'ip', 'protocol'])
-        config.delete(isis_base + ['route-map'])
-
-# Check if vrf names are configured. Check if IS-IS 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', 'isis', 'route-map']):
-            tmp = config.return_value(vrf_base + ['protocols', 'isis', 'route-map'])
-
-            config.set(vrf_base + ['ip', 'protocol', 'isis', 'route-map'], value=tmp)
-            config.set_tag(vrf_base + ['ip', 'protocol', 'isis'])
-            config.delete(vrf_base + ['protocols', 'isis', '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:
+    # Check if IS-IS is configured - if so, migrate the CLI node
+    if config.exists(isis_base):
+        if config.exists(isis_base + ['route-map']):
+            tmp = config.return_value(isis_base + ['route-map'])
+
+            config.set(['system', 'ip', 'protocol', 'isis', 'route-map'], value=tmp)
+            config.set_tag(['system', 'ip', 'protocol'])
+            config.delete(isis_base + ['route-map'])
+
+    # Check if vrf names are configured. Check if IS-IS 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', 'isis', 'route-map']):
+                tmp = config.return_value(vrf_base + ['protocols', 'isis', 'route-map'])
+
+                config.set(vrf_base + ['ip', 'protocol', 'isis', 'route-map'], value=tmp)
+                config.set_tag(vrf_base + ['ip', 'protocol', 'isis'])
+                config.delete(vrf_base + ['protocols', 'isis', 'route-map'])