fix for #13291- az webapp deployment slot swap should support preserv…

…eVnet

src/azure-cli/azure/cli/command_modules/appservice/_params.py

@@ -389,6 +389,8 @@ def load_arguments(self, _):
         c.argument('auto_swap_slot', help='target slot to auto swap', default='production')
         c.argument('disable', help='disable auto swap', action='store_true')
         c.argument('target_slot', help="target slot to swap, default to 'production'")
+        c.argument('preserve_vnet', help="preserve Virtual Network to the slot during swap, default to 'true'",
+                   arg_type=get_three_state_flag(return_label=True))
     with self.argument_context('webapp deployment slot create') as c:
         c.argument('configuration_source',
                    help="source slot to clone configurations from. Use web app's name to refer to the production slot")

src/azure-cli/azure/cli/command_modules/appservice/custom.py

@@ -2197,19 +2197,22 @@ def list_slots(cmd, resource_group_name, webapp):
     return slots
 
 
-def swap_slot(cmd, resource_group_name, webapp, slot, target_slot=None, action='swap'):
+def swap_slot(cmd, resource_group_name, webapp, slot, target_slot=None, preserve_vnet=None, action='swap'):
     client = web_client_factory(cmd.cli_ctx)
+    isPreserveVnet = preserve_vnet if preserve_vnet is not None else 'true'
+    # converstion from string to Boolean
+    isPreserveVnet = bool(isPreserveVnet == 'true')
     if action == 'swap':
         poller = client.web_apps.swap_slot_slot(resource_group_name, webapp,
-                                                slot, (target_slot or 'production'), True)
+                                                slot, (target_slot or 'production'), isPreserveVnet)
         return poller
     if action == 'preview':
         if target_slot is None:
             result = client.web_apps.apply_slot_config_to_production(resource_group_name,
-                                                                     webapp, slot, True)
+                                                                     webapp, slot, isPreserveVnet)
         else:
             result = client.web_apps.apply_slot_configuration_slot(resource_group_name, webapp,
-                                                                   slot, target_slot, True)
+                                                                   slot, target_slot, isPreserveVnet)
         return result
     # we will reset both source slot and target slot
     if target_slot is None: