Comment 13 for bug 1728603

Reviewed: https://review.openstack.org/517390
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=64f773ab96619b97de2bc521fdfc8400fdb7bd3d
Submitter: Zuul
Branch: stable/ocata

commit 64f773ab96619b97de2bc521fdfc8400fdb7bd3d
Author: Matt Riedemann <email address hidden>
Date: Mon Oct 30 12:49:31 2017 -0400

    libvirt: do not remove inst_base when volume-backed during resize

    When confirming a resize, the libvirt driver on the source host checks
    to see if the instance base directory (which contains the domain xml
    files, etc) exists and if the root disk image does not, it removes the
    instance base directory.

    However, the root image disk won't exist on local storage for a
    volume-backed instance and if the instance base directory is on shared
    storage, e.g. NFS or Ceph, between the source and destination host, the
    instance base directory is incorrectly deleted.

    This adds a check to see if the instance is volume-backed when checking
    to see if the instance base directory should be removed from the source
    host when confirming a resize.

    Change-Id: I29fac80d08baf64bf69e54cf673e55123174de2a
    Closes-Bug: #1728603
    (cherry picked from commit f02afc6569bd930114a4b56413dbd6becc5e7e75)
    (cherry picked from commit d5d81a29050966f47050f0f77001273b1aa55116)