raw_template hot parameter type data migration

Changes were made to the hot syntax which prevent invalid templates
already present in the database from being loaded as part of a stack
list. This database migration forces the parameter schema type to
be lowercase.

Change-Id: Iaa4b16e9b5188e6e99cda95e1c7fb0dc11c206f7
Partial-Bug: #1274288

heat/db/sqlalchemy/migrate_repo/versions/037_migrate_hot_template.py

@@ -0,0 +1,58 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import copy
+from migrate.versioning import util as migrate_util
+from sqlalchemy.orm import sessionmaker
+
+from heat.openstack.common.gettextutils import _
+from heat.db.sqlalchemy import models
+from heat.engine.hot import HOTParamSchema
+
+
+def upgrade(migrate_engine):
+    Session = sessionmaker(bind=migrate_engine)
+    session = Session()
+
+    raw_templates = session.query(models.RawTemplate).all()
+
+    for raw_template in raw_templates:
+        if ('heat_template_version' in raw_template.template
+                and 'parameters' in raw_template.template):
+
+            template = copy.deepcopy(raw_template.template)
+            for parameter, schema in template['parameters'].iteritems():
+                changed = False
+
+                def _commit_schema(parameter, schema):
+                    template['parameters'][parameter] = schema
+                    raw_template.template = template
+                    session.commit()
+
+                if 'Type' in schema:
+                    schema['type'] = schema['Type']
+                    del schema['Type']
+                    changed = True
+
+                if (schema.get('type') not in HOTParamSchema.TYPES
+                        and schema['type'].istitle()):
+                    schema['type'] = schema['type'].lower()
+                    changed = True
+
+                if changed:
+                    _commit_schema(parameter, schema)
+
+
+def downgrade(migrate_engine):
+    migrate_util.log.warning(_('This version cannot be downgraded because '
+                               'it involves a data migration to the '
+                               'raw_template table.'))