Re: Help with DBus Tests Failing for Python Package

[Maxim Cournoyer]

Hi,

Jaft <jaft.r@outlook.com> writes:

>  On Tuesday, December 27, 2022 at 11:49:31 AM CST, Maxim Cournoyer 
> <maxim.cournoyer@gmail.com> wrote: 
>> I bet this is because of the expectation of python-dbus on the processes
>> being reaped by PID 1 instead of staying around as zombies, as currently
>> happens in the Guix build container (see:
>> https://issues.guix.gnu.org/30948).
>>
>> The current workaround currently used in Guix involves the use of tini
>> and of a forked process... it's not very pretty (see 'guix edit mutter'
>> for such an example).
>
> Thanks a ton for the pointer, Maxim.
>
> Unfortunately, I still seem to be getting the same result. At first, I tried 
> a simple approach of ~(execlp "tini" "--" "python" "setup.py" "test")~; I 
> think it wound up still requiring the =dbus= package, to run.
>
> That failing, I decided to try something closer to what =mutter= was doing 
> with

[...]

>>                            (match (primitive-fork)
>>                              (0                    ;child process
>>                               (set-child-subreaper!)
>>                               ;; XXX: Tini provides proper PID1-like signal 
>>handling that
>>                               ;; reaps zombie processes, necessary for the
>>                               ;; 'test_shutdown_subprocesses' test to pass.
>>
>>                               ;; TODO: Complete 
>>https://issues.guix.gnu.org/30948.
>>                               ;; (execlp "tini" "--" "python" "setup.py" 
>>"test")
>>                               (execlp "tini" "--"
>>                                       "dbus-run-session" "--"
>>                                       "xvfb-run" "-a" "-s" (getenv 
>>"XVFB_SERVER_ARGS")
>>                                       "python" "setup.py" "test"))
>>                              (pid
>>                               (match (waitpid pid)
>>                                 ((_ . status)
>>                                  (unless (zero? status)
>>                                    (error "`pytest' exited with status"
>>                                           status))))))))))))
>
> I know some bits there are definitely not relevant; I figured I could clean 
> it up, after, if things worked but I'm still getting the exact same errors.
>
> Just to make sure /I'm/ not doing something incorrectly, is this within what 
> you meant? Or did I do anything that's obviously not correct, in this setup?

The important bits are the fork, the (set-child-subreaper!) in the
child process (forked) and the (execlp "tini" "--" your-test-commands).

If this doesn't improve things, the problem may be elsewhere.

-- 
Thanks,
Maxim