Re: Probing Meson for build configurations (was: [PATCH v2 3/6] tests/acceptance: allow a "graceful" failing for virtio-gpu test)

["Daniel P. Berrangé" <berrange@redhat.com>]

On Mon, Feb 22, 2021 at 12:44:37PM -0300, Wainer dos Santos Moschetta wrote:
> Hi Paolo,
> 
> Last week I was chatting with Cleber about probing configured features so
> that tests could be skipped (just like on this case). He has a
> implementation which never landed in, and is based on the old build system.
> Now with Meson, I am wondering if it has some sort of API for probing, or
> parsing the JSON files in build/meson-info/ is the proper way to inspect the
> build configuration.

Probing build configuration is the wrong approach.

We need to be querying the QEMU binary to ask if it has the logical
feature we need.  In this case

{
  "execute": "device-list-properties",
  "arguments": {
    "typename": "virtio-gpu-pci"
  },
}


the response will include "virgl" property, if QEMU was compiled
with VirGL. This is how libvirt detects VirGL support in QEMU
today.

> On 2/22/21 7:14 AM, Alex Bennée wrote:
> > This is a band-aid with a TODO for cases when QEMU doesn't start due
> > to missing VirGL. Longer term we could do with some proper feature
> > probing.
> > 
> > Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> > Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> > Reviewed-by: Willian Rampazzo <willianr@redhat.com>
> > Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
> > Message-Id: <20210217121932.19986-7-alex.bennee@linaro.org>
> > ---
> >   tests/acceptance/virtio-gpu.py | 7 ++++++-
> >   1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tests/acceptance/virtio-gpu.py b/tests/acceptance/virtio-gpu.py
> > index ab1a4c1a71..ab18cddbb7 100644
> > --- a/tests/acceptance/virtio-gpu.py
> > +++ b/tests/acceptance/virtio-gpu.py
> > @@ -85,7 +85,12 @@ def test_virtio_vga_virgl(self):
> >               "-append",
> >               kernel_command_line,
> >           )
> > -        self.vm.launch()
> > +        try:
> > +            self.vm.launch()
> > +        except:
> > +            # TODO: probably fails because we are missing the VirGL features
> > +            self.cancel("VirGL not enabled?")
> > +
> >           self.wait_for_console_pattern("as init process")
> >           exec_command_and_wait_for_pattern(
> >               self, "/usr/sbin/modprobe virtio_gpu", ""

Regards,
Daniel
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