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

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

** Changed in: nova
    Milestone: None => juno-3

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https://bugs.launchpad.net/bugs/1346385

Title:
  libvirt: live migration stopped working after shared storage pacthes

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Live migration has stopped working with NFS shared storage, after this patch has been submitted:
  https://review.openstack.org/#/c/91722, as one of the new checks doesn't take into account the file based shared storage.

  2014-07-17 16:14:14.276 50785 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: local variable 'instance_dir' referenced before assignment
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 393, in decorated_function
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     payload)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 303, in decorated_function
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     e, sys.exc_info())
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 290, in decorated_function
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 4465, in pre_live_migration
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     migrate_data)
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 4585, in pre_live_migration
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher     self._create_images_and_backing(context, instance, instance_dir,
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher UnboundLocalError: local variable 'instance_dir' referenced before assignment
  2014-07-17 16:14:14.276 50785 TRACE oslo.messaging.rpc.dispatcher
  2014-07-17 16:14:14.280 50785 ERROR oslo.messaging._drivers.common [-] Returning exception local variable 'instance_dir' referenced before assignment to caller
  2014-07-17 16:14:14.280 50785 ERROR oslo.messaging._drivers.common [-] ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line

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