[PATCH 13/21] util: virqemu: Introduce virQEMUBuildNetdevCommandlineFromJSON

[Peter Krempa]

On Mon, May 18, 2020 at 10:07:25 -0500, Eric Blake wrote:
> On 5/15/20 10:27 AM, Peter Krempa wrote:
> > In preparation for converting the generator of -netdev to generate JSON
> > which will be used to do the command line rather than the other way
> > around we need to introduce a convertor which properly configures
> > virQEMUBuildCommandLineJSON for the quirks of -netdev.
> > 
> > Signed-off-by: Peter Krempa <pkrempa at redhat.com>
> > ---
> >   src/libvirt_private.syms |  1 +
> >   src/util/virqemu.c       | 22 ++++++++++++++++++++++
> >   src/util/virqemu.h       |  3 +++
> >   3 files changed, 26 insertions(+)
> > 
> 
> > +/**
> > + * virQEMUBuildNetdevCommandlineFromJSON:
> > + * @props: JSON properties describing a netdev
> > + *
> > + * Converts @props into arguments for -netdev including all the quirks and
> > + * differences between the monitor and command line syntax.
> > + */
> > +char *
> > +virQEMUBuildNetdevCommandlineFromJSON(virJSONValuePtr props)
> > +{
> > +    const char *type = virJSONValueObjectGetString(props, "type");
> > +    g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
> > +
> > +    virBufferAsprintf(&buf, "%s,", type);
> > +
> > +    if (virQEMUBuildCommandLineJSON(props, &buf, "type", true, NULL) < 0)
> > +        return NULL;
> 
> Do we actually have to special-case "type"?

I'd have to go back and see since when we can use type= explicitly with
qemu and I didn't really feel doing that across all supported qemu
versions. Well, to be fair not even across the reasonable versions.