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 +982,37 @@
 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 new 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 configuring 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
+
+  - name: List all Linux Consumption function apps that are eligible for migration to the Flex Consumption plan, ignoring if they have slots configured. Please note that slots are not supported in the Flex Consumption plan.
+    text: >
+        az functionapp flex-migration list --ignore-slots
+"""
+
 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

@@ -232,6 +232,25 @@ 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 list') as c:
+        c.argument('ignore_slots', arg_type=get_three_state_flag(return_label=True),
+                   help="Skip the check for slots for the existing function app. Please note that Flex Consumption does not support slots, so this should only be used if you do not intend to use slots.")
+
+    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.')
+        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 managed identities migration.")
+        c.argument('skip_access_restrictions', options_list=['--skip-access-restrictions', '--sar'], arg_type=get_three_state_flag(return_label=True), help="Skip access restrictions migration.")
+        c.argument('skip_storage_mount', options_list=['--skip-storage-mount', '--ssm'], arg_type=get_three_state_flag(return_label=True), help="Skip storage mount migration.")
+        c.argument('skip_hostnames', options_list=['--skip-hostnames', '--sh'], arg_type=get_three_state_flag(return_label=True), help="Skip hostnames migration.")
+        c.argument('skip_cors', options_list=['--skip-cors', '--sc'], arg_type=get_three_state_flag(return_label=True), help="Skip CORS migration.")
+        c.argument('ignore_slots', arg_type=get_three_state_flag(return_label=True),
+                   help="Skip the check for slots for the existing function app. Please note that Flex Consumption does not support slots, so this should only be used if you do not intend to use slots.")
+
     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

@@ -344,6 +344,10 @@ 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)