qemu modularization of qemu-5.1 vs libvirt domcapabilities cache?

[Martin Wilck]

On Thu, 2020-08-20 at 11:00 +0100, Daniel P. Berrangé wrote:
> On Wed, Aug 05, 2020 at 10:19:26AM +0200, Andrea Bolognani wrote:
> > contents change.
> > 
> > That said, if upgrading QEMU results in losing features, even
> > though
> > you can recover them through additional steps I would argue that's
> > a
> > bug in the packaging that should be addressed on the QEMU side.
> 
> Potentially we can consider this a  distro packaging problem and fix
> it at the RPM level.
> 
> eg the libvirt RPM can define a trigger that runs when *any* of the
> qemu-device*  RPMs is installed/updated. This trigger can simply
> touch a file on disk somewhere, and libvirtd can monitor this one
> file, instead of having to monitor every module.

The simplest approach is to touch the qemu binaries. We discussed this
already. It has the drawback that it makes "rpm -V" complain about
wrong timestamps. It might also confuse backup software. Still, it
might be a viable short-term workaround if nothing else is available.

Cheers,
Martin