Re: weird errors; shepherd

[Danny Milosavljevic <dannym@scratchpost.org>]

Hi Ludo,

On Wed, 24 Jan 2018 15:47:16 +0100
ludo@gnu.org (Ludovic Courtès) wrote:

> I’m not sure what you mean.  There’s no notion of dependencies among
> activation snippets, let alone between activation snippets and service
> starts (when booting, activation snippets run *before* shepherd is
> started).  Perhaps there’s a misunderstanding here?

Yeah, if it's intended that way, that's fine.  So it's like /etc/rc.local
and it just runs the snippets in any order?

Now, I just do both the trytond DB-upgrading and the service starting at the
"start" action because postgres isn't running yet otherwise.

> >   As far as I understand make-forkexec-constructor takes special care not
> >   to kill stderr.  As long there's no log-file specified it should leave stdout
> >   and stderr alone.  So where does the text go?  
> 
> To PID 1’s stdout/stderr, i.e., /dev/console (which sucks).

Really?  I don't see it in the marionette os output (for make check-system) - 
I just tried it again, stdout is nowhere to be seen with check-system.
(I just put a program-file as shepherd start action and called "display" there)

Also tried
                    (marionette-eval '(current-output-port
                                                 (open-file "/dev/console" "w0"))
                                                                            marionette)
                    (marionette-eval '(current-error-port
                                                 (open-file "/dev/console" "w0"))
                                                                            marionette)

but that didn't change anything either...

> > I've had other problems like:
> >
> > * root's shepherd hangs sometimes and herd can't connect to it anymore.  
> 
> That’s a serious bug.  Can you reproduce it?

I'll try.

> That’s inconvenient but “expected” in the sense that the ‘start’ method
> is called right from shepherd.conf.  Perhaps we should call ‘start’ at a
> later stage.

Well, as it is it makes the system very brittle.

Once one service does that... oops.