cloudformation - use mutually_exclusive for on_create_failure and disable_rollback (#65629)

* cloudformation - use mutually_exclusive for on_create_failure and disable_rollback

* cloudformation - remove unit test test_disable_rollback_and_on_failure_defined

lib/ansible/modules/cloud/amazon/cloudformation.py

@@ -399,15 +399,11 @@ def create_stack(module, stack_params, cfn, events_limit):
 
     # 'DisableRollback', 'TimeoutInMinutes', 'EnableTerminationProtection' and
     # 'OnFailure' only apply on creation, not update.
-    #
-    # 'OnFailure' and 'DisableRollback' are incompatible with each other, so
-    # throw error if both are defined
-    if module.params.get('on_create_failure') is None:
-        stack_params['DisableRollback'] = module.params['disable_rollback']
-    else:
-        if module.params['disable_rollback']:
-            module.fail_json(msg="You can specify either 'on_create_failure' or 'disable_rollback', but not both.")
+    if module.params.get('on_create_failure') is not None:
         stack_params['OnFailure'] = module.params['on_create_failure']
+    else:
+        stack_params['DisableRollback'] = module.params['disable_rollback']
+
     if module.params.get('create_timeout') is not None:
         stack_params['TimeoutInMinutes'] = module.params['create_timeout']
     if module.params.get('termination_protection') is not None:
@@ -675,7 +671,8 @@ def main():
 
     module = AnsibleModule(
         argument_spec=argument_spec,
-        mutually_exclusive=[['template_url', 'template', 'template_body']],
+        mutually_exclusive=[['template_url', 'template', 'template_body'],
+                            ['disable_rollback', 'on_create_failure']],
         supports_check_mode=True
     )
     if not HAS_BOTO3:

test/units/modules/cloud/amazon/test_cloudformation.py

@@ -146,25 +146,6 @@ def test_missing_template_body():
     assert "Either 'template', 'template_body' or 'template_url' is required when the stack does not exist." == m.exit_kwargs['msg']
 
 
-def test_disable_rollback_and_on_failure_defined():
-    m = FakeModule(
-        on_create_failure='DELETE',
-        disable_rollback=True,
-    )
-    with pytest.raises(Exception) as exc_info:
-        cfn_module.create_stack(
-            module=m,
-            stack_params={'TemplateBody': ''},
-            cfn=None,
-            events_limit=default_events_limit
-        )
-        pytest.fail('Expected module to fail with both on_create_failure and disable_rollback defined')
-
-    assert exc_info.match('FAIL')
-    assert not m.exit_args
-    assert "You can specify either 'on_create_failure' or 'disable_rollback', but not both." == m.exit_kwargs['msg']
-
-
 def test_on_create_failure_delete(maybe_sleep, placeboify):
     m = FakeModule(
         on_create_failure='DELETE',