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

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

** Changed in: nova
    Milestone: None => icehouse-2

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https://bugs.launchpad.net/bugs/1261636

Title:
  Need set compute driver's flag capabilities correctly

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  1.Back ground:
  Class ComputeDriver, base of all compute drivers, has dictionary capabilities
  to indicate if the compute driver implements some functions. The 'supports_recreate'
  flag needs the driver to support the evacuate operation. The 'has_imagecache' flag
  needs the driver to implement the 'manage_image_cache' method.[1] Compute manger will
  check this with capabilities['has_imagecache'] [2]or capabilities['supports_recreate']
  [3]directly.

  2. Problems:
  1)Docker does not currently support these two functions, so the capabilities flags
  should not be set.[4]
  2)Baremetal only set 'has_imagecache', there is code path leading KeyError.
  Need set capabilities explicitly to avoid this.[5]

  3.Solution:
  Set or unset compute driver's capabilities explicitly.

  [1] https://github.com/openstack/nova/blob/master/nova/virt/driver.py#L128
  [2] https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L5168
  [3] https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L2142
  [4] https://github.com/openstack/nova/blob/master/nova/virt/docker/driver.py#L62
  [5] https://github.com/openstack/nova/blob/master/nova/virt/baremetal/driver.py#L114

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