Include an OS::stack_id output when generating a template

When generating a template to act as a facade for an existing resource
type, include an OS::stack_id output so that doing get_resource on the
facade resource will return the physical ID of the inner resource.

Change-Id: I257e9cc2eefd2cb8153e94cd05b21fed4b03c6c7

heat/engine/attributes.py

@@ -122,6 +122,17 @@ class Attribute(object):
             }
 
 
+def _stack_id_output(resource_name, template_type='cfn'):
+    if template_type == 'hot':
+        return {
+            "value": {"get_resource": resource_name},
+        }
+    else:
+        return {
+            "Value": {"Ref": resource_name},
+        }
+
+
 @repr_wrapper
 class Attributes(collections.Mapping):
     """Models a collection of Resource Attributes."""
@@ -156,8 +167,10 @@ class Attributes(collections.Mapping):
         attr_schema.update(resource_class.base_attributes_schema)
         attribs = Attributes._make_attributes(attr_schema).items()
 
-        return dict((n, att.as_output(resource_name,
+        outp = dict((n, att.as_output(resource_name,
                                       template_type)) for n, att in attribs)
+        outp['OS::stack_id'] = _stack_id_output(resource_name, template_type)
+        return outp
 
     @staticmethod
     def schema_from_outputs(json_snippet):

heat/tests/test_attributes.py

@@ -172,6 +172,9 @@ class AttributesTest(common.HeatTestCase):
             "test3": {
                 "Value": {"Fn::GetAtt": ["test_resource", "test3"]},
                 "Description": "Test attrib 3"
+            },
+            "OS::stack_id": {
+                "Value": {"Ref": "test_resource"},
             }
         }
         MyTestResourceClass = mock.MagicMock()
@@ -202,6 +205,9 @@ class AttributesTest(common.HeatTestCase):
             "test3": {
                 "value": {"get_attr": ["test_resource", "test3"]},
                 "description": "Test attrib 3"
+            },
+            "OS::stack_id": {
+                "value": {"get_resource": "test_resource"},
             }
         }
         MyTestResourceClass = mock.MagicMock()

heat/tests/test_resource.py

@@ -1442,6 +1442,9 @@ class ResourceTest(common.HeatTestCase):
                 'show': {
                     'Description': u'Detailed information about resource.',
                     'Value': {"Fn::GetAtt": ["TestResource", "show"]}
+                },
+                'OS::stack_id': {
+                    'Value': {"Ref": "TestResource"}
                 }
             }
         }
@@ -1526,6 +1529,9 @@ class ResourceTest(common.HeatTestCase):
                 'show': {
                     'description': u'Detailed information about resource.',
                     'value': {"get_attr": ["TestResource", "show"]}
+                },
+                'OS::stack_id': {
+                    'value': {"get_resource": "TestResource"}
                 }
             }
         }