From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#37967: guix environment -CN: Operation not permitted mounting
 host's /var/run/nscd
Date: Fri, 01 Nov 2019 15:26:27 +0100
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 i. Balaguer's message of "Tue, 29 Oct 2019 18:47:14 -0400")
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To: Ivan Vilata i Balaguer <ivan@selidor.net>
Cc: 37967@debbugs.gnu.org

Ivan Vilata i Balaguer <ivan@selidor.net> skribis:

> Salut Ludovic=C2=A0!

Hola!  :-)

> Ludovic Court=C3=A8s (2019-10-29 23:16:49 +0100) wrote:
>
>> Bon dia Ivan,
>>=20
>> Ivan Vilata i Balaguer <ivan@selidor.net> skribis:
>>=20
>> > Hi!  While using Guix commit `c9fc03a3` on Debian unstable, whenever I=
 run
>> > `guix environment -CN` (either as a normal user or as root) I get an e=
rror
>> > like this:
>> >
>> >     guix environment: error: mount: mount "/var/run/nscd" on "/tmp/gui=
x-directory.6kBgXe//var/run/nscd": Operation not permitted
>> >
>> > nscd is installed and working in my host machine.
>>=20
>> What does =E2=80=98uname -rs=E2=80=99 return?
>
>     $ uname -rs
>     Linux 5.2.0-3-amd64
>
>> What about =E2=80=98ls -ld /var/run/nscd=E2=80=99?
>
>     $ ls -ld /var/run/nscd
>     drwxr-xr-x 2 root root 60 Oct 29 15:58 /var/run/nscd

Hmm, what does this command return:

  mkdir /tmp/tt
  unshare -mUr mount --bind /var/run/nscd /tmp/tt

?

What about a read-only bind mount like this:

  unshare -mUr mount --bind -o ro /var/run/nscd /tmp/tt

?

What if you try bind-mounting a directory owned by your user?

  mkdir /tmp/mine
  unshare -mUr mount --bind /tmp/mine /tmp/tt

?

Thanks in advance,
Ludo=E2=80=99.