New tests: GTK3 platform accessibility

[Colomban Wendling]

Le 13/09/2023 à 22:56, Michael Weghorn a écrit :
> On 2023-09-12 10:49, Colomban Wendling wrote:
>> All that is a bit confusing to me, but let me try ton understand:
>> - On a system using dbus-broker, when logged in under GNOME, test fails?
>> - On *the same system*, but logging-in through SSH works!??
> 
> Yes, that's what I've observed in a Fedora 38 VM.
> 
>> That's worrying, as it suggests the running environment has too much 
>> influence on the test run, which is not good.
>>
>> However, IIUC you suggest it might be a dbus/dbus-borken conflict 
>> somehow?
> 
> That's what it looked like to me during first analysis.
> 
> What might be happening is that at-spi-bus-launcher detects a systemd 
> environment that makes it think running dbus-broker should work, but 
> something about the systemd/D-Bus environment in the virtual X session 
> provided by xfvb-run and dbus-launch doesn't match what's 
> expected/required.
> 
> […]

Ah, makes some sense indeed.  I guess if at-spi itself is not using the 
same DBus implementation as the app is it might not work indeed…  and 
IIUC here the ap will be using the dbus-launch one, which IIUC is gonna 
be dbus-daemon, and at-spi2 is using dbus-broker.

I am not knowledgeable about that, but maybe we could run in a separate 
cgroup to escape this?

Or maybe we could have a dbus-broker compatibility, either as you 
mention below (that I don't fully follow without diving deeper), or 
simply emulating the bits we need like --exit-with-session which should 
not be that hard to mimic (basically watch the Xvfb session lifetime, 
e.g. with `xprop -root -spy` and terminate our own dbus-broker when it 
exits).

> I'm on vacation this week, but could give this another try in my Fedora 
> VM sometime afterwards. Or, if you're also attending LibreOffice 
> conference next week in person, we could also take a look at it together 
> then for example.

I'll be there, we can indeed try and pull some hairs together on this 
then :)