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

(cherry picked from commit 26740a8d583f64dc0a27b59dd4ae303056972c0b)

1 files changed, 99 insertions, 103 deletions

diff --git a/src/migration-scripts/dhcp-server/4-to-5 b/src/migration-scripts/dhcp-server/4-to-5
index d15e0baf5..a655515dc 100755..100644
--- a/src/migration-scripts/dhcp-server/4-to-5
+++ b/src/migration-scripts/dhcp-server/4-to-5
@@ -1,122 +1,118 @@
 #!/usr/bin/env python3
 
+# Copyright 2018-2024 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/>.
+
 # Removes boolean operator from:
 #   - "set service dhcp-server shared-network-name <xyz> subnet 172.31.0.0/24 ip-forwarding enable (true|false)"
 #   - "set service dhcp-server shared-network-name <xyz> authoritative (true|false)"
 #   - "set service dhcp-server disabled (true|false)"
 
-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()
-
-config = ConfigTree(config_file)
-
-if not config.exists(['service', 'dhcp-server']):
-    # Nothing to do
-    sys.exit(0)
-else:
-    base = ['service', 'dhcp-server']
-    # Make node "set service dhcp-server dynamic-dns-update enable (true|false)" valueless
-    if config.exists(base + ['dynamic-dns-update']):
-        bool_val = config.return_value(base + ['dynamic-dns-update', 'enable'])
-
-        # Delete the node with the old syntax
-        config.delete(base + ['dynamic-dns-update'])
-        if str(bool_val) == 'true':
-            # Enable dynamic-dns-update with new syntax
-            config.set(base + ['dynamic-dns-update'], value=None)
-
-    # Make node "set service dhcp-server disabled (true|false)" valueless
-    if config.exists(base + ['disabled']):
-        bool_val = config.return_value(base + ['disabled'])
-
-        # Delete the node with the old syntax
-        config.delete(base + ['disabled'])
-        if str(bool_val) == 'true':
-            # Now disable DHCP server with the new syntax
-            config.set(base + ['disable'], value=None)
-
-    # Make node "set service dhcp-server hostfile-update (enable|disable) valueless
-    if config.exists(base + ['hostfile-update']):
-        bool_val = config.return_value(base + ['hostfile-update'])
-
-        # Delete the node with the old syntax incl. all subnodes
-        config.delete(base + ['hostfile-update'])
-        if str(bool_val) == 'enable':
-            # Enable hostfile update with new syntax
-            config.set(base + ['hostfile-update'], value=None)
-
-    # Run this for every instance if 'shared-network-name'
-    for network in config.list_nodes(base + ['shared-network-name']):
-        base_network = base + ['shared-network-name', network]
-        # format as tag node to avoid loading problems
-        config.set_tag(base + ['shared-network-name'])
-
-        # Run this for every specified 'subnet'
-        for subnet in config.list_nodes(base_network + ['subnet']):
-            base_subnet = base_network + ['subnet', subnet]
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['service', 'dhcp-server']):
+        # Nothing to do
+        return
+    else:
+        base = ['service', 'dhcp-server']
+        # Make node "set service dhcp-server dynamic-dns-update enable (true|false)" valueless
+        if config.exists(base + ['dynamic-dns-update']):
+            bool_val = config.return_value(base + ['dynamic-dns-update', 'enable'])
+
+            # Delete the node with the old syntax
+            config.delete(base + ['dynamic-dns-update'])
+            if str(bool_val) == 'true':
+                # Enable dynamic-dns-update with new syntax
+                config.set(base + ['dynamic-dns-update'], value=None)
+
+        # Make node "set service dhcp-server disabled (true|false)" valueless
+        if config.exists(base + ['disabled']):
+            bool_val = config.return_value(base + ['disabled'])
+
+            # Delete the node with the old syntax
+            config.delete(base + ['disabled'])
+            if str(bool_val) == 'true':
+                # Now disable DHCP server with the new syntax
+                config.set(base + ['disable'], value=None)
+
+        # Make node "set service dhcp-server hostfile-update (enable|disable) valueless
+        if config.exists(base + ['hostfile-update']):
+            bool_val = config.return_value(base + ['hostfile-update'])
+
+            # Delete the node with the old syntax incl. all subnodes
+            config.delete(base + ['hostfile-update'])
+            if str(bool_val) == 'enable':
+                # Enable hostfile update with new syntax
+                config.set(base + ['hostfile-update'], value=None)
+
+        # Run this for every instance if 'shared-network-name'
+        for network in config.list_nodes(base + ['shared-network-name']):
+            base_network = base + ['shared-network-name', network]
             # format as tag node to avoid loading problems
-            config.set_tag(base_network + ['subnet'])
+            config.set_tag(base + ['shared-network-name'])
 
-            # Make node "set service dhcp-server shared-network-name <xyz> subnet 172.31.0.0/24 ip-forwarding enable" valueless
-            if config.exists(base_subnet + ['ip-forwarding', 'enable']):
-                bool_val = config.return_value(base_subnet + ['ip-forwarding', 'enable'])
-                # Delete the node with the old syntax
-                config.delete(base_subnet + ['ip-forwarding'])
-                if str(bool_val) == 'true':
-                    # Recreate node with new syntax
-                    config.set(base_subnet + ['ip-forwarding'], value=None)
-
-            # Rename node "set service dhcp-server shared-network-name <xyz> subnet 172.31.0.0/24 start <172.16.0.4> stop <172.16.0.9>
-            if config.exists(base_subnet + ['start']):
-                # This is the new "range" id for DHCP lease ranges
-                r_id = 0
-                for range in config.list_nodes(base_subnet + ['start']):
-                    range_start = range
-                    range_stop = config.return_value(base_subnet + ['start', range_start, 'stop'])
+            # Run this for every specified 'subnet'
+            for subnet in config.list_nodes(base_network + ['subnet']):
+                base_subnet = base_network + ['subnet', subnet]
+                # format as tag node to avoid loading problems
+                config.set_tag(base_network + ['subnet'])
 
+                # Make node "set service dhcp-server shared-network-name <xyz> subnet 172.31.0.0/24 ip-forwarding enable" valueless
+                if config.exists(base_subnet + ['ip-forwarding', 'enable']):
+                    bool_val = config.return_value(base_subnet + ['ip-forwarding', 'enable'])
                     # Delete the node with the old syntax
-                    config.delete(base_subnet + ['start', range_start])
+                    config.delete(base_subnet + ['ip-forwarding'])
+                    if str(bool_val) == 'true':
+                        # Recreate node with new syntax
+                        config.set(base_subnet + ['ip-forwarding'], value=None)
+
+                # Rename node "set service dhcp-server shared-network-name <xyz> subnet 172.31.0.0/24 start <172.16.0.4> stop <172.16.0.9>
+                if config.exists(base_subnet + ['start']):
+                    # This is the new "range" id for DHCP lease ranges
+                    r_id = 0
+                    for range in config.list_nodes(base_subnet + ['start']):
+                        range_start = range
+                        range_stop = config.return_value(base_subnet + ['start', range_start, 'stop'])
+
+                        # Delete the node with the old syntax
+                        config.delete(base_subnet + ['start', range_start])
+
+                        # Create the node for the new syntax
+                        # Note: range is a tag node, counter is its child, not a value
+                        config.set(base_subnet + ['range', r_id])
+                        config.set(base_subnet + ['range', r_id, 'start'], value=range_start)
+                        config.set(base_subnet + ['range', r_id, 'stop'], value=range_stop)
+
+                        # format as tag node to avoid loading problems
+                        config.set_tag(base_subnet + ['range'])
+
+                        # increment range id for possible next range definition
+                        r_id += 1
 
-                    # Create the node for the new syntax
-                    # Note: range is a tag node, counter is its child, not a value
-                    config.set(base_subnet + ['range', r_id])
-                    config.set(base_subnet + ['range', r_id, 'start'], value=range_start)
-                    config.set(base_subnet + ['range', r_id, 'stop'], value=range_stop)
+                    # Delete the node with the old syntax
+                    config.delete(['service', 'dhcp-server', 'shared-network-name', network, 'subnet', subnet, 'start'])
 
-                    # format as tag node to avoid loading problems
-                    config.set_tag(base_subnet + ['range'])
 
-                    # increment range id for possible next range definition
-                    r_id += 1
+            # Make node "set service dhcp-server shared-network-name <xyz> authoritative" valueless
+            if config.exists(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative']):
+                authoritative = config.return_value(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative'])
 
                 # Delete the node with the old syntax
-                config.delete(['service', 'dhcp-server', 'shared-network-name', network, 'subnet', subnet, 'start'])
+                config.delete(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative'])
 
-
-        # Make node "set service dhcp-server shared-network-name <xyz> authoritative" valueless
-        if config.exists(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative']):
-            authoritative = config.return_value(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative'])
-
-            # Delete the node with the old syntax
-            config.delete(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative'])
-
-            # Recreate node with new syntax - if required
-            if authoritative == "enable":
-                config.set(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative'])
-
-    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)
+                # Recreate node with new syntax - if required
+                if authoritative == "enable":
+                    config.set(['service', 'dhcp-server', 'shared-network-name', network, 'authoritative'])