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

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

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

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https://bugs.launchpad.net/bugs/1339386

Title:
  Reboot should not require a Glance.show

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  When a host is rebooted, we use `resume_state_on_host_boot` to spin
  back up the instances.

  In `libvirt` this translates to a bunch of `_hard_reboot` calls.

  The problem is that, `_hard_reboot` calls `_get_guest_xml`, which then
  calls `get_image_metadata` (since no `image_meta` is passed in). This
  in turn triggers a call to `glance.show` which will fail.

  The reason the call will fail is that, the glanceclient needs user-
  credentials in order to make this call, but since we're a server-side
  triggered action (host rebooting), we don't have a user-request
  context.

  At a high-level, this is an issue of user-impersonation for server-
  side-triggered actions, which we don't have good story for yet.

  We do, however, have a work around for this particular case.

  We can use the cached image_metadata that we store with the instance.

  In fact `_hard_reboot` is already using it, so we just need to pass
  that `image_meta` into `_get_guest_xml` and it will work.

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