libvirt resizes of instances with ephemeral or swap defined fail

[Rafi Khardalian]

Using the current master tree, attempting to resize an instance with the libvirt driver, which has an ephemeral or swap disk will throw an exception. This is a result of my commit:

https://github.com/openstack/nova/commit/6e768363450774cfee90e41aa5c40af780d3e04a

The code was not properly guarding against backing files not existing with QCOW2 images. As such, get_disk_backing_file() would return None, then the subsequent call to basename() on None would cause an exception.

[Rafi Khardalian (rkhardalian)]

Patch is ready.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/33007
Committed: http://github.com/openstack/nova/commit/cf3cf3c8e5137e775eec9939e88aa1df339ba1bf
Submitter: Jenkins
Branch: master

commit cf3cf3c8e5137e775eec9939e88aa1df339ba1bf
Author: Rafi Khardalian <email address hidden>
Date: Fri Jun 14 06:47:57 2013 +0000

    libvirt fix resize/migrates with swap or ephemeral

    Fixes bug 1191608

    The code was not properly guarding against backing files not
    existing with QCOW2 images. As such, get_disk_backing_file() would
    return None, then the subsequent call to basename() on None would
    cause an exception.

    This bug was introduced with the fix for bug 1185588 and commit
    6e768363.

    Change-Id: I4b1237ddf01b9398bfdc141180260136b36cae5a