GNU bug report logs - #37162
‘guix pack -f docker’ creates an image without /etc/passwd

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From: Ludovic Courtès <ludovic.courtes <at> inria.fr>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: Ricardo Wurmus <rekado <at> elephly.net>, 37162 <at> debbugs.gnu.org
Subject: bug#37162: ‘guix pack -f docker’ creates an image without /etc/passwd
Date: Mon, 26 Aug 2019 09:37:52 +0200

Hi Maxim,

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> skribis:

> Ricardo Wurmus <rekado <at> elephly.net> writes:
>
>> Hi Maxim,
>>
>>> Ludovic Courtès <ludovic.courtes <at> inria.fr> writes:
>>>
>>>> ‘guix pack -f docker’ currently creates an image without
>>>> /etc/{passwd,group,shadow}.
>>>>
>>>> It’s OK most of the time, but again it looks like a gratuitous annoyance
>>>> for those cases where having them around matters (that’s also the reason
>>>> why guix-daemon creates them.)
>>>
>>> Would that include the files required for PAM authentication to work
>>> correctly? I remember struggling with this use case: using the Docker
>>> image with CQFD wrapper, which must be able to create a user and
>>> sudo'ing (or 'su') to it in the docker container.
>>
>> I wonder if at this point it wouldn’t be better to build a whole system
>> container.  Isn’t that outside the scope of “guix pack” and rather a
>> task for “guix system”?

I think so.

> Probably! But then one has to wonder if adding some base files to `guix
> pack' is not one of those slippery slopes where users come back
> expecting more stuff to be there?
>
> What use case(s) exactly depend on the presence of the
> /etc/{passwd,group,shadow} files?

Generally, absent these files, getpw(3) and co. won’t give useful
results, and some applications will behave poorly (e.g., the PS1 prompt
in Bash can’t show the user name; ‘id’ fails).

Most of the time it’s just a minor inconvenience.

Ludo’.

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