1 files changed, 50 insertions, 0 deletions
diff --git a/keystone-moon/keystone/common/sql/migrate_repo/versions/096_drop_role_name_constraint.py b/keystone-moon/keystone/common/sql/migrate_repo/versions/096_drop_role_name_constraint.py
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+++ b/keystone-moon/keystone/common/sql/migrate_repo/versions/096_drop_role_name_constraint.py
@@ -0,0 +1,50 @@
+# 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 migrate
+import sqlalchemy as sql
+
+_ROLE_TABLE_NAME = 'role'
+_ROLE_NAME_COLUMN_NAME = 'name'
+
+
+def upgrade(migrate_engine):
+    meta = sql.MetaData()
+    meta.bind = migrate_engine
+
+    role_table = sql.Table(_ROLE_TABLE_NAME, meta, autoload=True)
+
+    # NOTE(morganfainberg): the `role_name` unique constraint is not
+    # guaranteed to be named 'ixu_role_name', so we need to search for the
+    # correct constraint that only affects role_table.c.name and drop
+    # that constraint.
+    #
+    # This is an idempotent change that reflects the fix to migration
+    # 88 if the role_name unique constraint was not named consistently and
+    # someone manually fixed the migrations / db without dropping the
+    # old constraint.
+    to_drop = None
+    if migrate_engine.name == 'mysql':
+        for c in role_table.indexes:
+            if (c.unique and len(c.columns) == 1 and
+                    _ROLE_NAME_COLUMN_NAME in c.columns):
+                to_drop = c
+                break
+    else:
+        for c in role_table.constraints:
+            if len(c.columns) == 1 and _ROLE_NAME_COLUMN_NAME in c.columns:
+                to_drop = c
+                break
+
+    if to_drop is not None:
+        migrate.UniqueConstraint(role_table.c.name,
+                                 name=to_drop.name).drop()