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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

The referenced change was backported to ocata so marking this as
affecting pike and ocata:

https://review.openstack.org/#/c/441037/

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Also affects: nova/pike
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1728603

Title:
  Resize a boot-from-volume instance with NFS destroys instance

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) ocata series:
  New
Status in OpenStack Compute (nova) pike series:
  New

Bug description:
  Turns out that the fix for
  https://bugs.launchpad.net/nova/+bug/1666831 accidentally broke boot-
  from-volume setups that use NFS. In particular, this line:

  https://github.com/openstack/nova/blob/stable/ocata/nova/virt/libvirt/driver.py#L1149

          if os.path.exists(inst_base) and not root_disk.exists():
              try:
                  shutil.rmtree(inst_base)
              except OSError as e:
                  if e.errno != errno.ENOENT:
                      raise

  Causes the instance basedir which includes the instances libvirt.XML
  file to be deleted.

  The above needs to be changed to this in order to prevent BFV
  instances from being destroyed on resize...

   if os.path.exists(inst_base) and not root_disk.exists() and not
  compute_utils.is_volume_backed_instance(instance._context, instance):

  This bug was reported and the fix confirmed by Joris S'heeran

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