starting using guix

starting using guix

[Aleix Conchillo Flaqué]

Hi,

just started using guix yesterday by following "info guix". I found a
couple of problems:

1. After adding guix build groupd and users, as suggested:

     # groupadd guix-builder
     # for i in `seq 1 10`;
       do
         useradd -g guix-builder -d /var/empty -s `which nologin` \
                 -c "Guix build user $i" guix-builder$i;
       done

I get this error when trying to build a package "guix-package -i guile":

error: build failed: the build users group `guix-builder' has no members

To solved this I have manually added guild-builder users in
guix-builder group in /etc/group:

guix-builder:x:1001:guix-builder1

I am not sure why the former doesn't work by default.

2. Once this was solved I ran into:

error: build failed: builder does not have write permission to
`/nix/store'; try `chgrp 1001 /nix/store; chmod 1775 /nix/store'

Which is solved by the recommendation in the message.

After that, I've been able to continue the process.

I am not sure if I missed to do something before starting using guix,
or these errors are common and have to be fixed manually.

Thanks,

Aleix

Re: starting using guix

[Aleix Conchillo Flaqué]

On Sat, Jan 19, 2013 at 3:11 PM, Aleix Conchillo Flaqué
<aconchillo@gmail.com> wrote:

>      # groupadd guix-builder
>      # for i in `seq 1 10`;
>        do
>          useradd -g guix-builder -d /var/empty -s `which nologin` \
>                  -c "Guix build user $i" guix-builder$i;
>        done
>
> I get this error when trying to build a package "guix-package -i guile":
>
> error: build failed: the build users group `guix-builder' has no members
>

I think this is because nix uses "getgrnam"
(nix/libstore/build.cc:472) which returns information only from
/etc/group not from /etc/passwd where the main group is stored. By
default, if you specify -g in useradd that would be the primary group
and is only stored in /etc/passwd.

So, the solution is:

useradd -g guix-builder -G guix-builder  ....

This will set the primary group in /etc/passwd and will also add the
user in guix-builder group in /etc/group. You might not specify -g
guix-builder which is OK, but it will generate an additional group for
each user.

Aleix

Re: starting using guix

[Ludovic Courtès]

Hi,

Aleix Conchillo Flaqué <aconchillo@gmail.com> skribis:

> So, the solution is:
>
> useradd -g guix-builder -G guix-builder  ....
>
> This will set the primary group in /etc/passwd and will also add the
> user in guix-builder group in /etc/group. You might not specify -g
> guix-builder which is OK, but it will generate an additional group for
> each user.

Oh, good catch.  Commit 091196b updates the manual accordingly.

Thanks!

Ludo’.