bug#57827: Shepherd 0.9.2 possible regressions

[Christopher Baines]

Mathieu Othacehe <othacehe@gnu.org> writes:

> Since Shepherd 0.9.2 the following tests are failing:
>
> * cgit: https://ci.guix.gnu.org/build/1427375/details
> * gitile https://ci.guix.gnu.org/build/1427377/details
>
> It seems that an unexpected #<eof> object is received on the marionette
> socket.

I had a look at the cgit system test, and it seems like this #<eof> is
coming from the NGinx pid file being empty.

Since empty files is a possibility with wait-for-file, I've sent a patch
to [1] which prevents the eof issue, plus another change to make it
easier to debug.

1: https://issues.guix.gnu.org/57850

With that change, both of the above tests seem to pass for me.

This could be related to the Shepherd upgrade, but only indirectly, as I
think the failure at least for cgit was also timing dependent.

Chris

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