[libvirt] [PATCH] qemu: Allow empty script path to <interface/>

[Daniel P. Berrange]

On Thu, Feb 02, 2017 at 02:49:48PM +0100, Michal Privoznik wrote:
> Before 9c17d665fdc5f (v1.3.2 - I know, right?) it was possible to
> have the following interface configuration:
> 
>   <interface type='ethernet'/>
>     <script path=''/>
>   </interface>
> 
> This resulted in -netdev tap,script=,.. Fortunately, qemu helped
> us to get away with this as it just ignored the empty script
> path. However, after the commit mentioned above it's libvirtd
> who is executing the script. Unfortunately without special
> case-ing empty script path.
> 
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>

This was always invalid input and the fact that it happened
to work in the past is just luck. Since this has been broken since
1.3.2 there's plenty of libvirt releases that reject this, and so
any app realistically has to be fixed to omit the <script> entirely
if they want any portability. As such I don't think we need to "fix"
this.

Regards,
Daniel
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