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[Dan Smith <dms@xxxxxxxxxxxxx>]

I think we determined this was related to a bad backport via mailing
list convo. Re-open if not.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1308805

Title:
  object backport doesn't work

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  The code to backport an object doesn't work at all. This code is only
  called in one place.

  In nova/objects/base.py in _process_object

  If the version is incompatible it tries to backport it:

      def _process_object(self, context, objprim):
          try:
              objinst = NovaObject.obj_from_primitive(objprim, context=context)
          except exception.IncompatibleObjectVersion as e:
              objinst = self.conductor.object_backport(context, objprim,
                                                       e.kwargs['supported'])
          return objinst

  
  You'll note here the object_backport is being passed in a primitive and a supported version and expecting back an object.

  However the object_backport method does:

      def object_backport(self, context, objinst, target_version):
          return objinst.obj_to_primitive(target_version=target_version)

  
  You'll see here it is expecting to be passed in an object and will return a primitive. Exactly the opposite of the only code in nova that calls this code.

  This is meaning we can't have Icehouse and Havana working together
  when trying to upgrade.

  Any ideas?

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