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

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

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

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https://bugs.launchpad.net/bugs/1481220

Title:
  Cannot boot from volume-backed instance snapshot

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Since that https://review.openstack.org/#/c/188789/ is merged, Nova
  fails to boot an instance from a volume-backed instance snapshot.

  Steps to reproduce against DevStack:
  1 boot an instance from a volume:
  nova boot inst --block-device source=image,dest=volume,size=1,bootindex=0,id=<xxx> --flavor m1.nano

  2 create a volume-backed snapshot
  nova image-create inst volback

  3 boot a new instance from the snapshot
  nova boot inst1 --image volback --flavor m1.nano

  Expected result: the new instance attributes.
  Actual result:
  ERROR (ClientException): The server has either erred or is incapable of performing the requested operation. (HTTP 500)

  n-api log:
     File "/opt/stack/nova/nova/compute/api.py", line 1488, in create
       check_server_group_quota=check_server_group_quota)
     File "/opt/stack/nova/nova/compute/api.py", line 1097, in _create_instance
       auto_disk_config, reservation_id, max_count)
     File "/opt/stack/nova/nova/compute/api.py", line 854, in _validate_and_build_base_options
       image_meta = objects.ImageMeta.from_dict(boot_meta)
     File "/opt/stack/nova/nova/objects/image_meta.py", line 91, in from_dict
       return cls(**image_meta)
     File "/opt/stack/nova/nova/objects/base.py", line 188, in __init__
       setattr(self, key, kwargs[key])
     File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 70, in setter
       field_value = field.coerce(self, name, value)
     File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/fields.py", line 184, in coerce
       return self._null(obj, attr)
     File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/fields.py", line 162, in _null
       raise ValueError(_("Field `%s' cannot be None") % attr)
   ValueError: Field `container_format' cannot be None

  !!! This blocks gating of stackforge/ec2-api project !!!

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