6ea945e3b1
In the instance_create DB API method, it ensures the (legacy) default security group gets created for the specified project_id if it does not already exist. If the security group does not exist, it is created in a separate transaction. Later in the instance_create method, it reads the default security group back that it wrote earlier (via the same ensure default security group code). But since it was written in a separate transaction, the current transaction will not be able to see it and will get back 0 rows. So, it creates a duplicate default security group record if project_id=NULL (which it will be, if running nova-manage db online_data_migrations, which uses an anonymous RequestContext with project_id=NULL). This succeeds despite the unique constraint on project_id because in MySQL, unique constraints are only enforced on non-NULL values [1]. To avoid creation of a duplicate default security group for project_id=NULL, we can use the default security group object that was returned from the first security_group_ensure_default call earlier in instance_create method and remove the second, redundant call. This also breaks out the security groups setup code from a nested method as it was causing confusion during code review and is not being used for any particular purpose. Inspection of the original commit where it was added in 2012 [2] did not contain any comments about the nested method and it appeared to either be a way to organize the code or a way to reuse the 'models' module name as a local variable name. Closes-Bug: #1824435 [1] https://dev.mysql.com/doc/refman/8.0/en/create-index.html#create-index-unique [2] https://review.opendev.org/#/c/8973/2/nova/db/sqlalchemy/api.py@1339 Change-Id: Idb205ab5b16bbf96965418cd544016fa9cc92de9
These are hooks to be used by the OpenStack infra test system. These scripts may be called by certain jobs at important times to do extra testing, setup, etc. They are really only relevant within the scope of the OpenStack infra system and are not expected to be useful to anyone else.