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[melanie witt <1808248@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Noticed this while working on a patch, when boot-from-volume instance
build fails during the _prep_block_device step, the message in the
instance.fault looks like this during a 'nova show':

 {"message": "Build of instance ec8f00c3-49a5-4ae0-9c93-1a813b17bf4c
aborted: Failure prepping block device.", "code": 500, "created":
"2018-12-12T22:06:22Z"}

where the underlying exception raised from _prep_block_device is absent.

We can see the error message being squashed here when
BuildAbortException is raised:

https://github.com/openstack/nova/blob/c72dafad8011198b78fd906f2fc7d1126e3f79f3/nova/compute/manager.py#L2341-L2343

We can provide more information for users if we include the exception
message from the exception raised in _prep_block_device in the
BuildAbortException, which will end up in the instance.fault.

** Affects: nova
     Importance: Undecided
     Assignee: melanie witt (melwitt)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1808248

Title:
  Exceptions raised from _prep_block_device not included in
  instance.fault

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Noticed this while working on a patch, when boot-from-volume instance
  build fails during the _prep_block_device step, the message in the
  instance.fault looks like this during a 'nova show':

   {"message": "Build of instance ec8f00c3-49a5-4ae0-9c93-1a813b17bf4c
  aborted: Failure prepping block device.", "code": 500, "created":
  "2018-12-12T22:06:22Z"}

  where the underlying exception raised from _prep_block_device is
  absent.

  We can see the error message being squashed here when
  BuildAbortException is raised:

  https://github.com/openstack/nova/blob/c72dafad8011198b78fd906f2fc7d1126e3f79f3/nova/compute/manager.py#L2341-L2343

  We can provide more information for users if we include the exception
  message from the exception raised in _prep_block_device in the
  BuildAbortException, which will end up in the instance.fault.

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