[systemd-devel] Requires and After

[Jonathon Kowalski]

a.service will just not stop after it gets activated, and b.service fails.
Otherwise, the start job is cancelled with a JOB_DEPENDENCY job result. If
you need those semantics (and people often do), use After=, so that the
start job for a waits for the running job of b to complete (note that if
you have other things it needs to wait on, it will infact wait on them and
may even produce results you get with After=).

There may be a case made about installing a job of type JOB_STOP if and
ever b.service's *activation* fails, even after a.service activates
successfully, but I wonder if people are already using Requires= alone to
just cause the explicit stop requests (which is why they might not be usinf
PartOf=) of the required unit to take down their service, and startup
dependencies don't really matter. With this change, you'd break that then.

On Thursday, January 3, 2019, Jérémy Rosen <jeremy.rosen at smile.fr> wrote:

>
> Make of that what you will. I was expecting a.service to stop because
> b.service failed, but apparently my understanding of this isn't quite
> right.
>
>
> And that's kinda my point... most people (me included until recently)
> expect that behaviour
>
> I think the overall conclusion of that conversation is that... everything
> is very confusing and everybody is very confused.
>
>
> I'll try to clarify the docs and create a PR for that... It seems to be
> severely needed.
>
> --
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