Comment 17 for bug 1608934

Reviewed: https://review.openstack.org/355415
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=d0775c50d0c2bd50a62ccd49ea7063948af6c3b3
Submitter: Jenkins
Branch: master

commit d0775c50d0c2bd50a62ccd49ea7063948af6c3b3
Author: Jens Rosenboom <email address hidden>
Date: Mon Aug 15 13:16:58 2016 +0200

    Fix resizing in imagebackend.cache()

    The Flat and Lvm backends do not create a 'base image' (the file in the
    image cache) when creating an ephemeral or swap disk. However, cache()
    expects it to exist when checking if a resize is required.

    This change ignores the resize check if the backing file doesn't exist.
    This happens to be ok, because ephemeral and swap disks are always
    created with the correct target size anyway, and therefore never need
    to be resized.

    Closes-Bug: 1608934
    Co-Authored-By: Matthew Booth <email address hidden>
    Change-Id: I46b5658efafe558dd6b28c9910fb8fde830adec0