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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

4 files changed, 79 insertions, 130 deletions

diff --git a/src/migration-scripts/conntrack/1-to-2 b/src/migration-scripts/conntrack/1-to-2
index c4fe667fc..0a4fb3de9 100755..100644
--- a/src/migration-scripts/conntrack/1-to-2
+++ b/src/migration-scripts/conntrack/1-to-2
@@ -1,32 +1,26 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 # Delete "set system conntrack modules gre" 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]
 
-with open(file_name, 'r') as f:
-    config_file = f.read()
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['system', 'conntrack', 'modules', 'gre']):
+        return
 
-config = ConfigTree(config_file)
-
-if not config.exists(['system', 'conntrack', 'modules', 'gre']):
-    # Nothing to do
-    sys.exit(0)
-else:
     # Delete abandoned node
     config.delete(['system', 'conntrack', 'modules', 'gre'])
-
-    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/conntrack/2-to-3 b/src/migration-scripts/conntrack/2-to-3
index 6bb42be1e..5ad4e6350 100755..100644
--- a/src/migration-scripts/conntrack/2-to-3
+++ b/src/migration-scripts/conntrack/2-to-3
@@ -1,36 +1,31 @@
-#!/usr/bin/env python3
+# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 # Conntrack syntax version 3
 # Enables all conntrack modules (previous default behaviour) and omits manually disabled modules.
 
-import sys
-
 from vyos.configtree import ConfigTree
 
-if len(sys.argv) < 2:
-    print('Must specify file name!')
-    sys.exit(1)
-
-filename = sys.argv[1]
-
-with open(filename, 'r') as f:
-    config = ConfigTree(f.read())
-
 module_path = ['system', 'conntrack', 'modules']
 
-# Go over all conntrack modules available as of v1.3.0.
-for module in ['ftp', 'h323', 'nfs', 'pptp', 'sip', 'sqlnet', 'tftp']:
-    # 'disable' is being phased out.
-    if config.exists(module_path + [module, 'disable']):
-        config.delete(module_path + [module])
-    # If it wasn't manually 'disable'd, it was enabled by default.
-    else:
-        config.set(module_path + [module])
-
-try:
-    if config.exists(module_path):
-        with open(filename, 'w') as f:
-            f.write(config.to_string())
-except OSError as e:
-    print(f'Failed to save the modified config: {e}')
-    sys.exit(1)
+def migrate(config: ConfigTree) -> None:
+    # Go over all conntrack modules available as of v1.3.0.
+    for module in ['ftp', 'h323', 'nfs', 'pptp', 'sip', 'sqlnet', 'tftp']:
+        # 'disable' is being phased out.
+        if config.exists(module_path + [module, 'disable']):
+            config.delete(module_path + [module])
+        # If it wasn't manually 'disable'd, it was enabled by default.
+        else:
+            config.set(module_path + [module])
diff --git a/src/migration-scripts/conntrack/3-to-4 b/src/migration-scripts/conntrack/3-to-4
index e90c383af..679a260d5 100755..100644
--- a/src/migration-scripts/conntrack/3-to-4
+++ b/src/migration-scripts/conntrack/3-to-4
@@ -1,50 +1,30 @@
-#!/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/>.
 
 # Add support for IPv6 conntrack ignore, move existing nodes to `system conntrack ignore ipv4`
 
-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 = ['system', 'conntrack']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
 
-if config.exists(base + ['ignore', 'rule']):
-    config.set(base + ['ignore', 'ipv4'])
-    config.copy(base + ['ignore', 'rule'], base + ['ignore', 'ipv4', 'rule'])
-    config.delete(base + ['ignore', 'rule'])
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-try:
-    with open(file_name, 'w') as f:
-        f.write(config.to_string())
-except OSError as e:
-    print("Failed to save the modified config: {}".format(e))
-    exit(1)
+    if config.exists(base + ['ignore', 'rule']):
+        config.set(base + ['ignore', 'ipv4'])
+        config.copy(base + ['ignore', 'rule'], base + ['ignore', 'ipv4', 'rule'])
+        config.delete(base + ['ignore', 'rule'])
diff --git a/src/migration-scripts/conntrack/4-to-5 b/src/migration-scripts/conntrack/4-to-5
index d2e5fc5fa..775fe7480 100755..100644
--- a/src/migration-scripts/conntrack/4-to-5
+++ b/src/migration-scripts/conntrack/4-to-5
@@ -1,18 +1,17 @@
-#!/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/>.
 
 # T5779: system conntrack timeout custom
 # Before:
@@ -23,37 +22,18 @@
 #   Extend functionality to ipv6 and move ipv4 custom rules to new node:
 #       set system conntrack timeout custom [ipv4 | ipv6] rule <rule> ...
 
-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 = ['system', 'conntrack']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
-
-if config.exists(base + ['timeout', 'custom', 'rule']):
-    for rule in config.list_nodes(base + ['timeout', 'custom', 'rule']):
-        if config.exists(base + ['timeout', 'custom', 'rule', rule, 'protocol', 'tcp']):
-            config.set(base + ['timeout', 'custom', 'ipv4', 'rule'])
-            config.copy(base + ['timeout', 'custom', 'rule', rule], base + ['timeout', 'custom', 'ipv4', 'rule', rule])
-    config.delete(base + ['timeout', 'custom', 'rule'])
 
-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
+
+    if config.exists(base + ['timeout', 'custom', 'rule']):
+        for rule in config.list_nodes(base + ['timeout', 'custom', 'rule']):
+            if config.exists(base + ['timeout', 'custom', 'rule', rule, 'protocol', 'tcp']):
+                config.set(base + ['timeout', 'custom', 'ipv4', 'rule'])
+                config.copy(base + ['timeout', 'custom', 'rule', rule], base + ['timeout', 'custom', 'ipv4', 'rule', rule])
+        config.delete(base + ['timeout', 'custom', 'rule'])