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[jichenjc <jichenjc@xxxxxxxxxx>]

Public bug reported:

we had some problem when migrate from older release from L to N (it's
not kvm driver)


we had this error in virt layer in finish_migration function when we use following code in virt layer's finish_migration

image_meta = self._image_api.get(context, image_meta.id)

2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]     self.obj_load_attr(name)
2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 627, in obj_load_attr
2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]     _("Cannot load '%s' in the base class") % attrname)
2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416] NotImplementedError: Cannot load 'id' in the base class
2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]

so the problem is seems we didn't have image_meta.id set if it's an old
instance because old instance image_meta comes from system_metadata, I
think this image.id should be set when we create ImageMeta in any case?

e.g 
https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L4006

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1647347

Title:
  image_meta code migration in finish_migraiton  from older release

Status in OpenStack Compute (nova):
  New

Bug description:
  we had some problem when migrate from older release from L to N (it's
  not kvm driver)

  
  we had this error in virt layer in finish_migration function when we use following code in virt layer's finish_migration

  image_meta = self._image_api.get(context, image_meta.id)

  2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]     self.obj_load_attr(name)
  2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 627, in obj_load_attr
  2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]     _("Cannot load '%s' in the base class") % attrname)
  2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416] NotImplementedError: Cannot load 'id' in the base class
  2016-12-01 07:09:14.600 35918 ERROR nova.compute.manager [instance: c7c2adff-6e33-4b3f-b5e3-74327ea80416]

  so the problem is seems we didn't have image_meta.id set if it's an
  old instance because old instance image_meta comes from
  system_metadata, I think this image.id should be set when we create
  ImageMeta in any case?

  e.g 
  https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L4006

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