[Development] Using Git notes to reflect actual cherry-picks

[Oswald Buddenhagen]

On Fri, Feb 11, 2022 at 11:04:25PM -0800, Thiago Macieira wrote:
>(I don't think qtbase is the right place for this)
>
yeah, probably somewhere in qtqa/.

>I'd like to propose we use Git notes to include information into 
>commits about successful cherry-picks.
>
yay, i've been arguing for that before the cherry-pick bot even got 
deployed, see QTQAINFRA-3382. oh, and i filed a gerrit upstream request: 
https://bugs.chromium.org/p/gerrit/issues/detail?id=13743 .

>I have the scripts done, see above.
>All we need is that they are run weekly or the results pushed into the 
>repository.
>
we can do better than that - with a plugin, gerrit supports git-like 
server-side hooks just fine. see 
https://gerrit.googlesource.com/plugins/hooks/ .
alternatively, it'd also possible to monitor the gerrit event stream; 
see 
https://codereview.qt-project.org/Documentation/cmd-stream-events.html 
(that's the mechanism the sanity bot relies on; you can find it in 
qtrepotools//git-hooks/gerrit-bot (that location is historical and 
violates current guidelines)).