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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Tags added: liberty-backport-potential

** Also affects: nova/liberty
   Importance: Critical
     Assignee: Matt Riedemann (mriedem)
       Status: In Progress

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https://bugs.launchpad.net/bugs/1501831

Title:
  Evacuate libvirt instance failed with error 'Cannot load 'disk_format'
  in the base class'

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) liberty series:
  In Progress

Bug description:
  openstack-nova-12.0.0-201509202117

  When evacuate a libvirt instance, it failed with the following error:
  NotImplementedError: Cannot load 'disk_format' in the base class

  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2431, in spawn
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher     block_device_info)
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/blockinfo.py", line 630, in get_disk_info
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher     rescue)
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/blockinfo.py", line 537, in get_disk_mapping
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher     disk_bus, cdrom_bus, root_device_name)
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/blockinfo.py", line 432, in get_root_info
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher     if image_meta.disk_format == 'iso':
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 66, in getter
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher     self.obj_load_attr(name)
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 555, in obj_load_attr
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher     _("Cannot load '%s' in the base class") % attrname)
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher NotImplementedError: Cannot load 'disk_format' in the base class
  2015-09-30 08:04:47.484 19026 ERROR oslo_messaging.rpc.dispatcher

  When libvirt instance is evacuated, the image_meta is passed in with
  {}. So, the disk_format is not populated with the ImageMeta object.

  It's unclear to me what's the right way to fix this issue. Should
  change ImageMeta's from_dict to make sure 'disk_format' is always
  populated or we should add obj_load_attr method to ImageMeta

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