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[Zhenyu Zheng <zhengzhenyu@xxxxxxxxxx>]

Public bug reported:

Currently, when rebuilding an instance with volume attached, the Nova compute manager will directly call
_detach_volume() which will skip the checks of volume status (volume_api.check_detach) and setting the
volume to 'detaching' (volume_api.begin_detaching) at Cinder side. This is different with the normal volume
detach process. 

Besides, when rebuilding, we should only allow detaching the volume with in-use status, volume in status
such as 'retyping' should not allowed.

** Affects: nova
     Importance: Undecided
     Assignee: Zhenyu Zheng (zhengzhenyu)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Zhenyu Zheng (zhengzhenyu)

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https://bugs.launchpad.net/bugs/1489304

Title:
  Lack of volume status checks when detaching volume in rebuild.

Status in OpenStack Compute (nova):
  New

Bug description:
  Currently, when rebuilding an instance with volume attached, the Nova compute manager will directly call
  _detach_volume() which will skip the checks of volume status (volume_api.check_detach) and setting the
  volume to 'detaching' (volume_api.begin_detaching) at Cinder side. This is different with the normal volume
  detach process. 

  Besides, when rebuilding, we should only allow detaching the volume with in-use status, volume in status
  such as 'retyping' should not allowed.

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