[libvirt] [PATCH 1/1] conf: handle empty string in interface target name

[Peter Krempa]

On Wed, Sep 25, 2019 at 12:42:07 +0000, Nikolay Shirokovskiy wrote:
> 
> 
> On 23.09.2019 17:44, Peter Krempa wrote:
> > On Mon, Sep 23, 2019 at 11:21:33 -0300, Daniel Henrique Barboza wrote:
> >>
> >>
> >> On 9/23/19 8:55 AM, Nikolay Shirokovskiy wrote:
> >>> Empty name is not allowed by schema but qemu is able to start with such
> >>> a config (and I guess some other hypervisors too). As a result name will
> >>> be generated by kernel and have form 'tap<N>'. At the same time if
> >>> target element is ommited in config the name will be generated by
> >>> libvirt and have form 'vnet<N>'. Let's have only the latter pattern
> >>> for autogenerated names by treating empty name as ommited.
> >>>
> >>> Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
> >>> ---
> >>
> >> Reviewed-by: Daniel Henrique Barboza <danielhb413 at gmail.com>
> > 
> > Change like this usually requires a test XML addition so that we can
> > validate and prevent regressions.
> > 
> 
> I would like to, but seems it requires mocking syscalls for
> dealing with taps/interfaces which is a good deal of work
> so I guess next time...

The XML2XML test which does not invoke any preparation code should be
enough in this case.

Also rather than mocking syscalls libvirt's prepare steps were split up
so that tests can skip steps which would actually modify the host so
possibly you'll just need to refactor the setup code to be executed in a
different place.