Introduce container_cli parameter for undercloud.conf

This parameter, default to 'docker' for now, can be changed to 'podman'
if we want to deploy an Undercloud with Podman instead of Docker.

blueprint podman-support

Change-Id: I8e83a3903f6c67087d4e18734a61661dbd597185

tripleoclient/config/standalone.py

@@ -188,6 +188,10 @@ class StandaloneConfig(BaseConfig):
                         help=_('Used to add custom insecure registries in '
                                '/etc/sysconfig/docker.')
                         ),
+            cfg.StrOpt('container_cli',
+                       default='docker',
+                       help=_('Container CLI used for deployment; '
+                              'Can be docker or podman.')),
         ]
         return self.sort_opts(_base_opts + _opts)
 

tripleoclient/tests/config/test_config_standalone.py

@@ -26,6 +26,7 @@ class TestStandaloneConfig(base.TestCase):
     def test_get_base_opts(self):
         ret = self.config.get_base_opts()
         expected = ['cleanup',
+                    'container_cli',
                     'container_images_file',
                     'custom_env_files',
                     'deployment_user',
@@ -84,6 +85,7 @@ class TestStandaloneConfig(base.TestCase):
     def test_get_opts(self):
         ret = self.config.get_opts()
         expected = ['cleanup',
+                    'container_cli',
                     'container_images_file',
                     'custom_env_files',
                     'deployment_user',

tripleoclient/tests/config/test_config_undercloud.py

@@ -29,6 +29,7 @@ class TestUndercloudConfig(base.TestCase):
                     'certificate_generation_ca',
                     'clean_nodes',
                     'cleanup',
+                    'container_cli',
                     'container_images_file',
                     'custom_env_files',
                     'deployment_user',
@@ -79,6 +80,7 @@ class TestUndercloudConfig(base.TestCase):
                     'certificate_generation_ca',
                     'clean_nodes',
                     'cleanup',
+                    'container_cli',
                     'container_images_file',
                     'custom_env_files',
                     'deployment_user',

tripleoclient/v1/undercloud_config.py

@@ -321,6 +321,8 @@ def prepare_undercloud_deploy(upgrade=False, no_validations=False,
     env_data['DockerInsecureRegistryAddress'].extend(
         CONF['docker_insecure_registries'])
 
+    env_data['ContainerCli'] = CONF['container_cli']
+
     if CONF.get('docker_registry_mirror', None):
         env_data['DockerRegistryMirror'] = CONF['docker_registry_mirror']