bug#22626: Postgres service fails on adding user

[Christopher Allan Webber]

Ludovic Courtès writes:

> Christopher Allan Webber <address@hidden> skribis:
>
>> Heya all... guix system config attached.  I tried doing a guix system
>> reconfigure and it failboat'ed.  Here's what happened:
>>
>>   adding user 'postgres'...
>>   useradd: group 'postgres' does not exist
>
> Normally just above that there should be:
>
>   adding group 'postgres'
>
> Could it be that adding the group silently failed?  What does /etc/group
> shows?

Well, it looks like it does do that.  I didn't show my full output
because there's a lot of garbage... maybe it turns out that this garbage
is related:

The following derivation will be built:
   /gnu/store/kil0p7xg6qrvvkf3mp0j0xii09s1cqx7-grub.cfg.drv
/gnu/store/qsgrb7inl2mkrnccxf524faqax63dbs4-system
/gnu/store/1b31ydr0yrc3jdl6i4chaccsbapzq0m5-grub.cfg
/gnu/store/sx2xqvr3s033bl60s09zs6jjbs73n791-grub-2.00
activating system...
setting up setuid programs in '/run/setuid-programs'...
populating /etc from /gnu/store/piaczch5x7vczy9z7yjq4z8631rh828p-etc...
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
adding group 'postgres'...
groupadd: existing lock file /etc/group.lock without a PID
groupadd: cannot lock /etc/group; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
adding user 'ntpd'...
useradd: existing lock file /etc/group.lock without a PID
useradd: cannot lock /etc/group; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: no changes
usermod: no changes
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
usermod: existing lock file /etc/shadow.lock without a PID
usermod: cannot lock /etc/shadow; try again later.
adding user 'postgres'...
useradd: group 'postgres' does not exist

Anyway /etc/group does not show postgres but I suppose it wouldn't
without the "guix system reconfigure" succeeding?

> (When testing in ‘guix system vm’, everything works well.)

I can't tell whether or not "guix system vm" would be fine; I assume it
probably would because I got to the point where qemu must have been
invoked, since my system crashed.  See my last bug.

It definitely does not work with "guix system reconfigure" though.