Add choices for option '--policy'

When creating server group, the '--policy' option is required, but
valid choice is 'affinity' or 'anti-affinity', adding multiple
policies will produce an error. This patch add choices and default
value for option '--policy', and remove the former help message.

Change-Id: I312680af384363b3e9a7de9aa1f0946643e193e2
Closes-Bug: #1662771

doc/source/command-objects/server-group.rst

@@ -15,13 +15,13 @@ Create a new server group
 .. code-block:: bash
 
     openstack server group create
-        --policy <policy> [--policy <policy>] ...
+        --policy <policy>
         <name>
 
 .. option:: --policy <policy>
 
     Add a policy to :ref:`\<name\> <server_group_create-name>`
-    (repeat option to add multiple policies)
+    ('affinity' or 'anti-affinity', default to 'affinity')
 
 .. _server_group_create-name:
 .. describe:: <name>

openstackclient/compute/v2/server_group.py

@@ -55,10 +55,11 @@ class CreateServerGroup(command.ShowOne):
         parser.add_argument(
             '--policy',
             metavar='<policy>',
-            action='append',
+            choices=['affinity', 'anti-affinity'],
-            required=True,
+            default='affinity',
             help=_("Add a policy to <name> "
-                   "(repeat option to add multiple policies)")
+                   "('affinity' or 'anti-affinity', "
+                   "default to 'affinity')")
         )
         return parser
 
@@ -67,7 +68,7 @@ class CreateServerGroup(command.ShowOne):
         info = {}
         server_group = compute_client.server_groups.create(
             name=parsed_args.name,
-            policies=parsed_args.policy)
+            policies=[parsed_args.policy])
         info.update(server_group._info)
 
         columns = _get_columns(info)

openstackclient/tests/unit/compute/v2/test_server_group.py

@@ -63,54 +63,23 @@ class TestServerGroupCreate(TestServerGroup):
 
     def test_server_group_create(self):
         arglist = [
-            '--policy', 'affinity',
+            '--policy', 'anti-affinity',
             'affinity_group',
         ]
         verifylist = [
-            ('policy', ['affinity']),
+            ('policy', 'anti-affinity'),
             ('name', 'affinity_group'),
         ]
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
         columns, data = self.cmd.take_action(parsed_args)
         self.server_groups_mock.create.assert_called_once_with(
             name=parsed_args.name,
-            policies=parsed_args.policy,
+            policies=[parsed_args.policy],
         )
 
         self.assertEqual(self.columns, columns)
         self.assertEqual(self.data, data)
 
-    def test_server_group_create_with_multiple_policies(self):
-        arglist = [
-            '--policy', 'affinity',
-            '--policy', 'soft-affinity',
-            'affinity_group',
-        ]
-        verifylist = [
-            ('policy', ['affinity', 'soft-affinity']),
-            ('name', 'affinity_group'),
-        ]
-        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
-        columns, data = self.cmd.take_action(parsed_args)
-        self.server_groups_mock.create.assert_called_once_with(
-            name=parsed_args.name,
-            policies=parsed_args.policy,
-        )
-
-        self.assertEqual(self.columns, columns)
-        self.assertEqual(self.data, data)
-
-    def test_server_group_create_no_policy(self):
-        arglist = [
-            'affinity_group',
-        ]
-        verifylist = None
-        self.assertRaises(tests_utils.ParserException,
-                          self.check_parser,
-                          self.cmd,
-                          arglist,
-                          verifylist)
-
 
 class TestServerGroupDelete(TestServerGroup):