[libvirt] [PATCH] qemu: Specify format= iff disk source is not empty

[Martin Kletzander]

On Sat, Jan 02, 2016 at 01:24:08PM +0100, Michal Privoznik wrote:
>Just recently, qemu forbade specifying format for sourceless
>disks (qemu commit 39c4ae941ed992a3bb5). It kind of makes sense.
>If there's no file to open, why specify its format. Anyway, I
>have a domain like this:
>
>    <disk type='file' device='cdrom'>
>      <driver name='qemu' type='raw'/>
>      <target dev='hda' bus='ide'/>
>      <readonly/>
>      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>    </disk>
>
>and obviously I am unable to start it. Therefore, a fix on our
>side is needed too.
>

ACK.
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