[libvirt] [RFC] Image Fleecing for Libvirt (BZ 955734, 905125)

[Daniel P. Berrange]

On Tue, Jul 23, 2013 at 10:22:23PM -0600, Eric Blake wrote:
> On 07/15/2013 03:04 PM, Richard W.M. Jones wrote:
> > On Mon, Jul 15, 2013 at 05:57:12PM +0800, Fam Zheng wrote:
> >> Hi all,
> >>
> >> QEMU-KVM BZ 955734, and libvirt BZ 905125 are about feature "Read-only
> >> point-in-time throwaway snapshot". The development is ongoing on
> >> upstream, which implements the core functionality by QMP command
> >> drive-backup. I want to demonstrate the HMP/QMP commands here for image
> >> fleecing tasks (again) and make sure this interface looks ready and
> >> satisfying from Libvirt point of view.
> 
> I'm wondering if we can still get something committed in time for the
> freeze for 1.1.1.  At this point, we're close enough to the freeze, and
> with no patches submitted in libvirt and the qemu design still under
> discussion, that I'm worried about whether we are rushing things too
> much to take a new interface this late in a libvirt release cycle, or
> whether we should wait until after 1.1.1 before attempting to add
> things.  On the other hand, if we can agree on a sane design now (or at
> least before rc2, if we miss rc1), then we can commit to that design for
> this libvirt release, and downstream distros can use libvirt 1.1.1 as a
> starting point for rebases without worrying about so-name compatibility,
> by signing up to the efforts of backporting actual implementation from
> future upstream qemu and libvirt releases.

IMHO we've missed the boat for adding new APIs in this release, particularly
given that there isn't even an finalized design & implementation ready to
review.

Daniel
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