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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1152748

Title:
  libvirt imagebackend cache code encapsulation needs refactoring

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  libvirt.imagebackend.cache needs to be refactored to eliminate the
  callback to call_if_not_exists().  The only way it could meet all the
  requirements while remaining a callback is if the os.path.exists()
  check were removed from the function, which would then require path
  checks in each of the backend classes where prepare_template() is
  called.  Ultimately, this is a lot more code than simply adding a
  backend-specific call to each class.

  There's too much risk associated with such a refactor at such a late
  stage for Grizzly, so we'll look to tackle this for Havana.

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