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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 41 insertions, 59 deletions

diff --git a/src/migration-scripts/dhcpv6-server/1-to-2 b/src/migration-scripts/dhcpv6-server/1-to-2
index cc5a8900a..ad307495c 100755..100644
--- a/src/migration-scripts/dhcpv6-server/1-to-2
+++ b/src/migration-scripts/dhcpv6-server/1-to-2
@@ -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/>.
 
 # T3316: Migrate to Kea
 # - Kea was meant to have support for key "prefix-highest" under PD which would allow an address range
@@ -20,67 +19,50 @@
 #   Ref: https://lists.isc.org/pipermail/kea-users/2022-November/003686.html
 # - Remove prefix temporary value, convert to multi leafNode (https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp6-srv.html#dhcpv6-server-limitations)
 
-import sys
 from vyos.configtree import ConfigTree
 from vyos.utils.network import ipv6_prefix_length
 
-if (len(sys.argv) < 1):
-    print("Must specify file name!")
-    sys.exit(1)
-
-file_name = sys.argv[1]
-
-with open(file_name, 'r') as f:
-    config_file = f.read()
-
 base = ['service', 'dhcpv6-server', 'shared-network-name']
-config = ConfigTree(config_file)
-
-if not config.exists(base):
-    # Nothing to do
-    exit(0)
 
-for network in config.list_nodes(base):
-    if not config.exists(base + [network, 'subnet']):
-        continue
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
 
-    for subnet in config.list_nodes(base + [network, 'subnet']):
-        # Delete temporary value under address-range prefix, convert tagNode to leafNode multi
-        if config.exists(base + [network, 'subnet', subnet, 'address-range', 'prefix']):
-            prefix_base = base + [network, 'subnet', subnet, 'address-range', 'prefix']
-            prefixes = config.list_nodes(prefix_base)
-            
-            config.delete(prefix_base)
+    for network in config.list_nodes(base):
+        if not config.exists(base + [network, 'subnet']):
+            continue
 
-            for prefix in prefixes:
-                config.set(prefix_base, value=prefix, replace=False)
+        for subnet in config.list_nodes(base + [network, 'subnet']):
+            # Delete temporary value under address-range prefix, convert tagNode to leafNode multi
+            if config.exists(base + [network, 'subnet', subnet, 'address-range', 'prefix']):
+                prefix_base = base + [network, 'subnet', subnet, 'address-range', 'prefix']
+                prefixes = config.list_nodes(prefix_base)
+                
+                config.delete(prefix_base)
 
-        if config.exists(base + [network, 'subnet', subnet, 'prefix-delegation', 'prefix']):
-            prefix_base = base + [network, 'subnet', subnet, 'prefix-delegation', 'prefix']
+                for prefix in prefixes:
+                    config.set(prefix_base, value=prefix, replace=False)
 
-            config.set(prefix_base)
-            config.set_tag(prefix_base)
+            if config.exists(base + [network, 'subnet', subnet, 'prefix-delegation', 'prefix']):
+                prefix_base = base + [network, 'subnet', subnet, 'prefix-delegation', 'prefix']
 
-            for start in config.list_nodes(base + [network, 'subnet', subnet, 'prefix-delegation', 'start']):
-                path = base + [network, 'subnet', subnet, 'prefix-delegation', 'start', start]
+                config.set(prefix_base)
+                config.set_tag(prefix_base)
 
-                delegated_length = config.return_value(path + ['prefix-length'])
-                stop = config.return_value(path + ['stop'])
+                for start in config.list_nodes(base + [network, 'subnet', subnet, 'prefix-delegation', 'start']):
+                    path = base + [network, 'subnet', subnet, 'prefix-delegation', 'start', start]
 
-                prefix_length = ipv6_prefix_length(start, stop)
+                    delegated_length = config.return_value(path + ['prefix-length'])
+                    stop = config.return_value(path + ['stop'])
 
-                # This range could not be converted into a simple prefix length and must be skipped
-                if not prefix_length:
-                    continue
+                    prefix_length = ipv6_prefix_length(start, stop)
 
-                config.set(prefix_base + [start, 'delegated-length'], value=delegated_length)
-                config.set(prefix_base + [start, 'prefix-length'], value=prefix_length)
+                    # This range could not be converted into a simple prefix length and must be skipped
+                    if not prefix_length:
+                        continue
 
-            config.delete(base + [network, 'subnet', subnet, 'prefix-delegation', 'start'])
+                    config.set(prefix_base + [start, 'delegated-length'], value=delegated_length)
+                    config.set(prefix_base + [start, 'prefix-length'], value=prefix_length)
 
-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)
+                config.delete(base + [network, 'subnet', subnet, 'prefix-delegation', 'start'])