bug#45830: Assert, that user and group names are unique -> breaks guix system reconfigure

[Leo Prikler]

Hi Jonathan,

Am Mittwoch, den 13.01.2021, 00:03 +0100 schrieb Jonathan Brielmaier:
> Hi Leo,
> 
> your commit a3002104:
> system: Assert, that user and group names are unique.
> 
> breaks `guix system reconfigure` for me and other people (at least
> two
> in IRC).
> 
> $ guix system reconfigure config.scm
> guix system: error: the following groups appear more than once: lp
> 
> $ sudo grep lp /etc/group
> lp:x:989:
> 
> lpadmin:x:975:
> 
> $ sudo grep lp /etc/passwd
> lp:!:18467::::::
It would seem you have two or more services adding an lp group then. 
Or one service and a manually defined one.

> The same happend on my server with the `nginx` group.
Same problem here; you're probably adding an nginx group twice in some
way.  This is especially concerning, given that it's groups twice – for
some reason nothing is adding additional users or else that check would
have been triggered first.

> I reverted it for the mean time, as I find it pretty grave...
I would have preferred, if you could instead have demoted it to a
warning.  I understand, that stuff suddenly breaking can be
frustrating, but I doubt the configurations you're using are fine.

> ~Jonathan
Regards,
Leo