Create az functionapp flex-migration commands to migrate CV1 apps to Flex Consumption

Author: kamperiadis

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

@@ -982,6 +982,33 @@
 short-summary: List available built-in stacks which can be used for function apps on the Flex Consumption plan.
 """
 
+helps['functionapp flex-migration'] = """
+type: group
+short-summary: Manage migration of Linux Consumption function apps to the Flex Consumption plan.
+"""
+
+helps['functionapp flex-migration start'] = """
+type: command
+short-summary: Create a Flex Consumption app with the same settings as the provided Linux Consumption function app.
+examples:
+  - name: Migrate a Linux Consumption function app to the Flex Consumption plan.
+    text: >
+        az functionapp flex-migration start --source-name MyLinuxConsumptionApp --source-resource-group MyLinuxConsumptionResourceGroup --name MyFunctionApp --resource-group MyResourceGroup --storage-account MyStorageAccount
+
+  - name: Migrate a Linux Consumption function app to the Flex Consumption plan without migrating managed identity configurations.
+    text: >
+        az functionapp flex-migration start --source-name MyLinuxConsumptionApp --source-resource-group MyLinuxConsumptionResourceGroup --name MyFunctionApp --resource-group MyResourceGroup --storage-account MyStorageAccount --skip-managed-identities
+"""
+
+helps['functionapp flex-migration list'] = """
+type: command
+short-summary: List all Linux Consumption function apps that are eligible for migration to the Flex Consumption plan.
+examples:
+  - name: List all Linux Consumption function apps that are eligible for migration to the Flex Consumption plan.
+    text: >
+        az functionapp flex-migration list
+"""
+
 helps['functionapp plan'] = """
 type: group
 short-summary: Manage App Service Plans for an Azure Function

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

@@ -238,6 +238,19 @@ def load_arguments(self, _):
                    help='Include the runtime details of the regions.', is_preview=True)
         c.argument('runtime', help="limit the output to just the specified runtime", is_preview=True)
 
+    with self.argument_context('functionapp flex-migration start') as c:
+        c.argument('source_resource_group', help='The resource group of the source function app to migrate from.')
+        c.argument('source_name', help='The name of the source function app to migrate from.')
+        c.argument('resource_group', help='The resource group of the target function app to migrate to.')
+        c.argument('name', help='The name of the target function app to migrate to.')
+        c.argument('storage_account', help='The storage account to use for the target function app. If no storage account is provided, the storage account of the source function app will be used.')
+        c.argument('maximum_instance_count', type=int, help="The maximum number of instances.")
+        c.argument('skip_managed_identities', options_list=['--skip-managed-identities', '--smi'], arg_type=get_three_state_flag(return_label=True), help="Skip migrating managed identities.")
+        c.argument('skip_access_restrictions', options_list=['--skip-access-restrictions', '--sar'], arg_type=get_three_state_flag(return_label=True), help="Skip migrating access restrictions.")
+        c.argument('skip_storage_mount', options_list=['--skip-storage-mount', '--ssm'], arg_type=get_three_state_flag(return_label=True), help="Skip migrating storage mounts.")
+        c.argument('skip_hostnames', options_list=['--skip-hostnames', '--sh'], arg_type=get_three_state_flag(return_label=True), help="Skip migrating hostnames.")
+        c.argument('skip_cors', options_list=['--skip-cors', '--sc'], arg_type=get_three_state_flag(return_label=True), help="Skip migrating CORS settings.")
+
     with self.argument_context('webapp deleted list') as c:
         c.argument('name', arg_type=webapp_name_arg_type, id_part=None)
         c.argument('slot', options_list=['--slot', '-s'], help='Name of the deleted web app slot.')

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

@@ -345,6 +345,10 @@ def load_command_table(self, _):
                                  custom_func_name='update_functionapp', getter_type=appservice_custom, setter_type=appservice_custom, command_type=webapp_sdk,
                                  validator=validate_functionapp_on_containerapp_update)
 
+    with self.command_group('functionapp flex-migration') as g:
+        g.custom_command('start', 'migrate_consumption_to_flex', exception_handler=ex_handler_factory())
+        g.custom_command('list', 'list_flex_migration_candidates', exception_handler=ex_handler_factory())
+
     with self.command_group('functionapp deployment config') as g:
         g.custom_command('set', 'update_deployment_configs', exception_handler=ex_handler_factory(), validator=validate_is_flex_functionapp)
         g.custom_show_command('show', 'get_deployment_configs', exception_handler=ex_handler_factory(), validator=validate_is_flex_functionapp)