Re: [Xen-devel] [libvirt test] 65324: regressions - FAIL

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 4 Dec 2015, Ian Campbell wrote:
> On Fri, 2015-12-04 at 14:43 +0000, Stefano Stabellini wrote:
> > On Fri, 4 Dec 2015, Ian Campbell wrote:
> > > Stefano, Anthony: The debian-di-install failure has "error: Unknown
> > > driver
> > > 'vhd'" in the qemu-log. It turns out this has previously been bisected
> > > and
> > > blamed on:
> > >
> > > Â commit 3fb401edbd8e9741c611bfddf6a2032ca91f55ed
> > > Â Merge: a44c280 816609b
> > > Â Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > > Â Date:ÂÂÂMon Nov 23 16:55:36 2015 +0000
> > >
> > > ÂÂÂÂÂÂMerge remote-tracking branch 'qemu-xen/staging' into qemu-xen-4.7
> >
> > This patch should fix the QEMU vhd issue:
> >
> > http://marc.info/?i=alpine.DEB.2.02.1512041435110.24652%40kaball.uk.xenso
> > urce.com
>
> OOI what causes it?

libxl passes "vhd" when actually "vpc" is the correct string to match
the right driver in QEMU. Secondly QEMU has become more stringent in how
format recognition is done and given that the user is passing a driver
name ("vhd", which is wrong), it is not going to try to guess the right
driver for the image anymore.

In other words, it used to work by "accident".

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