[Libguestfs] [PATCH] ovf: Try to set BiosType correctly according to the oVirt sources.

[Richard W.M. Jones]

On Mon, Dec 07, 2020 at 09:58:56AM +0100, Tomáš Golembiovský wrote:
> Hi,
> 
> On Fri, Dec 04, 2020 at 12:53:06PM +0000, Richard W.M. Jones wrote:
> > Tomas, what do you think about this?
> > 
> > As far as I can tell we are not setting the BiosType correctly in any
> > current scenario.
> 
> Yes, we are.
> 
> > Mostly we set it to "0" (cluster default), and I
> > guess we can get away with that most of the time.  For UEFI guests we
> > set it to "2" which simply seems wrong.
> > 
> > The patch tries to adjust the BiosType so it actually matches what the
> > oVirt source code says.
> 
> It's not really intuitive (not to mention undocumented), but there is a
> difference from what oVirt reads from OVF and how the Bios types are
> represented internally. Basically all values are shifted by one. See the
> '+1' in [1]. The change corresponding to the hack is here [2].

Urrrgh.  Thanks Tomas, I'll adjust virt-v2v again :-)

Rich.

> When they introduced cluster default in 4.4 development they did not
> realize it is used also by others. When we spotted the mistake it was
> already quite late and changing the enum to the original state was
> already out of question. So this hack was born.
> 
> If virt-v2v wanted to set it to cluster default it can be done by
> omitting <BiosType> element altogether or by setting custom="false"
> attribute. Specifying negative value for <BiosType> should also work but
> I'd rather not rely on that.
> 
> [1] https://github.com/oVirt/ovirt-engine/blob/master/backend/manager/modules/utils/src/main/java/org/ovirt/engine/core/utils/ovf/OvfReader.java#L699
> [2] https://gerrit.ovirt.org/c/ovirt-engine/+/106692
> 
> > 
> > Am I missing something?
> > 
> > Rich.
> > 
> > 
> 
> -- 
> Tomáš Golembiovský <tgolembi at redhat.com>

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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