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[OpenStack Infra <1563101@xxxxxxxxxxxxxxxxxx>]

** Changed in: keystone
       Status: Opinion => In Progress

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https://bugs.launchpad.net/bugs/1563101

Title:
  Remove backend dependency on core

Status in OpenStack Identity (keystone):
  In Progress

Bug description:
  Remove dependencies where backend code references code in the core.  For example, identity backends imports identity:
  https://github.com/openstack/keystone/blob/master/keystone/identity/backends/sql.py#L24

  The reasoning being that the core should know about the backend
  interface, but the backends should not know anything about the core
  (separation of concerns).

  And part of the risk here is a potential for circular dependencies.
  Backend code could reference code in the core, as well as other higher
  level modules inside identity; thus, creating a circular dependency.

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