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

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Message #26 received at 37162 <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Ludovic Courtès <ludovic.courtes <at> inria.fr>
Cc: Ricardo Wurmus <rekado <at> elephly.net>, 37162 <at> debbugs.gnu.org
Subject: Re: bug#37162: ‘guix pack -f docker’ creates an image without /etc/passwd
Date: Sun, 01 Sep 2019 00:02:32 +0900

Hello! Sorry for the late reply.

Ludovic Courtès <ludovic.courtes <at> inria.fr> writes:

> 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).

I see! I understand better the source of the annoyance now, thanks!

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

It seems OK to me to add those small files since make the experience
better.

Maxim

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