Re: "user with UID not found" error

[Jack Hill <jackhill@jackhill.us>]

On Mon, 1 Aug 2022, Christopher Batten wrote:

>>>>> On Jul 27, 2022, at 8:44 AM, Ricardo Wurmus <rekado@elephly.net> wrote:
>>>>>
>>>>> Hi Christopher,
>>>>>
>>>>>> Turns out we are using SSSD not NCSD on our Linux systems. It seems to be working fine:
>>>>>
>>>>> You will need to run NSCD if you want Guix software to be able to talk
>>>>> to the system’s SSSD.  The reason is that SSSD works by having
>>>>> applications load a library whereas NSCD implements a network protocol.
>>>>> Software built with Guix cannot load the system libary due to ABI
>>>>> conflict, but it *can* talk to NSCD over the network.
>>>>>
>>>>> The system NSCD talks to the system SSSD, so there’s no problem there.
>>>>>
>>>>> --
>>>>> Ricardo
>>>
>>> On Wed, Jul 27, 2022 at 12:51 PM Christopher Batten <cbatten@cornell.edu> wrote:
>>>
>>> Hmmm ... this made me think that running both was not a great idea?
>>>
>>> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system-level_authentication_guide/usingnscd-sssd
>>>
>>> But I am not an expert on any of this :) I guess the key is to just make sure you only enable caching for hosts in /etc/nscd.conf?
>>>
>>> Best,
>>> Chris
>>
>> On Jul 28, 2022, at 9:14 PM, Chris Marusich <cmmarusich@gmail.com> wrote:
>>
>> FYI: https://lists.gnu.org/archive/html/guix-devel/2022-02/msg00263.html
>
> Thanks for everyone's help! I think I understand now: the key is if we want to use guix, then we really do want to run NSCD and SSSD on these RHEL/CentOS systems if at all possible.
>
> So I think we just now need to follow the instructions here?
>
> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system-level_authentication_guide/usingnscd-sssd
>
> Or do you recommend a different way to run NSCD and SSSD at the same time on RHEL/CentOS systems?
>
> Once we figure this out maybe we should add a note about this in the Guix docs here:
>
> https://guix.gnu.org/manual/en/html_node/Application-Setup.html
>
> Especially if Fedora is intending to remove NSCD?
>
> Thanks!
> Chris

I think I've run into a similar issue trying to run packs as well (in my 
case on AlmaLinux 9). I produced a pack with

`guix pack -f tarball -RR -S /bin=bin screen sssd glibc`

and running screen from the pack reports:

"getpwuid() can't identify your account!"

screen might be a special-case of program, but it seems the problem exists 
in some way even when not trying to install Guix.

Best,
Jack