Add --config-download-only

A new CLI argument, --config-download-only, has been added which can be
used to skip the stack create/update and only run the config-download
workflow to apply the software configuration.

Change-Id: I6f3e8a943d49fea65e855d76e3c3d56f9eb8e41b

releasenotes/notes/config-download-only-d82ae32e13595f93.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - A new CLI argument, --config-download-only, has been added which can be
+    used to skip the stack create/update and only run the config-download
+    workflow to apply the software configuration.

tripleoclient/tests/v1/overcloud_deploy/test_overcloud_deploy.py

@@ -1860,6 +1860,44 @@ class TestDeployOvercloud(fakes.TestDeployOvercloud):
         self.assertTrue(mock_get_overcloud_hosts.called)
         self.assertTrue(mock_config_download.called)
 
+    @mock.patch('tripleoclient.workflows.deployment.get_overcloud_hosts')
+    @mock.patch('tripleoclient.workflows.deployment.enable_ssh_admin')
+    @mock.patch('tripleoclient.workflows.deployment.get_horizon_url',
+                autospec=True)
+    @mock.patch('tripleoclient.workflows.deployment.config_download')
+    @mock.patch('tripleoclient.utils.create_tempest_deployer_input',
+                autospec=True)
+    @mock.patch('tripleoclient.utils.get_overcloud_endpoint', autospec=True)
+    @mock.patch('tripleoclient.utils.write_overcloudrc', autospec=True)
+    @mock.patch('tripleoclient.workflows.deployment.overcloudrc',
+                autospec=True)
+    @mock.patch('tripleoclient.v1.overcloud_deploy.DeployOvercloud.'
+                '_deploy_tripleo_heat_templates_tmpdir', autospec=True)
+    def test_config_download_only(
+            self, mock_deploy_tmpdir,
+            mock_overcloudrc, mock_write_overcloudrc,
+            mock_overcloud_endpoint,
+            mock_create_tempest_deployer_input,
+            mock_config_download, mock_get_horizon_url,
+            mock_enable_ssh_admin,
+            mock_get_overcloud_hosts):
+        clients = self.app.client_manager
+        orchestration_client = clients.orchestration
+        orchestration_client.stacks.get.return_value = mock.Mock()
+
+        arglist = ['--templates', '--config-download-only']
+        verifylist = [
+            ('templates', '/usr/share/openstack-tripleo-heat-templates/'),
+            ('config_download_only', True),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        self.cmd.take_action(parsed_args)
+        self.assertFalse(mock_deploy_tmpdir.called)
+        self.assertTrue(mock_enable_ssh_admin.called)
+        self.assertTrue(mock_get_overcloud_hosts.called)
+        self.assertTrue(mock_config_download.called)
+
     def test_download_missing_files_from_plan(self):
         # Restore the real function so we don't accidentally call the mock
         self.cmd._download_missing_files_from_plan = self.real_download_missing

tripleoclient/v1/overcloud_deploy.py

@@ -805,6 +805,14 @@ class DeployOvercloud(command.Command):
                    'the stack and associated OpenStack resources. No '
                    'software configuration will be applied.')
         )
+        parser.add_argument(
+            '--config-download-only',
+            action='store_true',
+            default=False,
+            help=_('Disable the stack create/update, and only run the '
+                   'config-download workflow to apply the software '
+                   'configuration.')
+        )
         parser.add_argument(
             '--output-dir',
             action='store',
@@ -891,6 +899,7 @@ class DeployOvercloud(command.Command):
             print("Validation Finished")
             return
 
+        if not parsed_args.config_download_only:
             self._deploy_tripleo_heat_templates_tmpdir(stack, parsed_args)
 
         # Get a new copy of the stack after stack update/create. If it was