[Openstack-operators] [nova] Are we happy with libvirt-python >= 1.2.0 ?

John Garbutt john at johngarbutt.com
Fri May 15 13:45:06 UTC 2015

On 15 May 2015 at 13:28, Daniel P. Berrange <berrange at redhat.com> wrote:
> On Fri, May 15, 2015 at 11:51:22AM +0100, Daniel P. Berrange wrote:
>> On Thu, May 14, 2015 at 02:23:25PM -0500, Matt Riedemann wrote:
>> > There are some workarounds in the code [3] I'd like to see removed by
>> > bumping the minimum required version.
>> Sure, its nice to remove workarounds from a cleanliness POV, but I'm generally
>> pretty conservative about doing so, because in the majority of case (while it
>> looks ugly) it is not really a significant burden on maintainers to keep it
>> around.
>> This example is really just that. It certainly looks ugly, but we have the
>> code there now, it is doing the job for people who have that problem and it
>> isn't really having any measurable impact on our ability to maintain the
>> libvirt code. Removing this code won't lessen our maintainance burden in
>> any way, but it will unquestionably impact our users by removing support for
>> the platform they may be currently deployed on.
> BTW, the code you quote here:
>    http://git.openstack.org/cgit/openstack/nova/tree/nova/virt/libvirt/host.py?id=2015.1.0#n754
> is not actually working around a bug the libvirt hypervisor. It is in fact
> a bug in the libvirt-python API binding. As such we don't actually need to
> increase the min required libvirt to be able to remove that check. In fact
> increasing the min required libvirt is the wrong thing todo, because it is
> possible for someone to have the min required libvirt, but by accessing it
> via an older libvirt-python which still has the bug.
> So what's really needed is a dep on libvirt-python >= 1.2.0, not libvirt.
> We don't express min required versions for libvirt-python in the
> requirements.txt file though, since it is an optional package and we
> don't have any mechanism for recording min versions for those AFAIK.

Does this mean we can drop the above [3] code?


[3] http://git.openstack.org/cgit/openstack/nova/tree/nova/virt/libvirt/host.py?id=2015.1.0#n754

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