Re: Upgrading Shepherd services

[Attila Lendvai]

> I have a lot of custom Shepherd services. Every so often I make a
> mistake that stalls the step in 'guix deploy' that upgrades Shepherd
> services, but without any error messages.
> 
> Unfortunately, I can also no longer run 'herd status', which likewise
> hangs, or 'reboot'. How may I debug such issues in my operating-system
> declaration, please?


Ludo,

this is the kind of issue for which extensive logging is needed. i.e. there's 
no self-contained reproducer (or is there, Felix?), and it requires a live 
environment to experience it.

and i suspect that i may even have fixed this in one of the commits that cleans 
up shepherd's error handling. one of the issues i remember is that an exception 
from the start (or stop?) GEXP of a service sometimes brought shepherd into a 
non-responsive state (without any sign of it in its logs).

Felix,

i'm planning to rebase my branch on Ludo's devel branch. it's not trivial 
because Ludo continues hacking shepherd, but i'll hopefully do it in the next 
few days. after that you may give it a try and see if you experience this issue 
again, and if you do then you can have plenty of logs to give you a clue 
why/how it happens.

if you do have a reproducer, then i'd be interested in adding it as a test in 
the shepherd codebase.

https://codeberg.org/attila-lendvai-patches/shepherd/commits/branch/various

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