Comment 4 for bug 1195877

Reviewed: https://review.openstack.org/35133
Committed: http://github.com/openstack/nova/commit/65386c91910ee03d947c2b8bcc226a53c30e060a
Submitter: Jenkins
Branch: master

commit 65386c91910ee03d947c2b8bcc226a53c30e060a
Author: Jan Grant <email address hidden>
Date: Mon Jul 1 14:18:46 2013 +0100

    libvirt: Fix spurious backing file existence check.

    Bug 1195877

    The problem lies with the truncation of backing file names at the
    first underscore character. On a reboot, nova-compute checks the
    backing images exist. Typically, they will do; however, instead
    of looking for an "ephemeral_XXX" file, it hunts for "ephemeral".
    This won't exist, triggering code that attempts to pull the whole
    image again from glance(!)

    Lacking credentials, the attempt to fetch the image will fail,
    ultimately resulting in the instance going to an ERROR state.

    Change-Id: Iabcc7a1ffd248c22a747a1ddc7863d2b386d409a