On Fri, 30 Mar 2018 20:23:49 +0100
James Le Cuirot <chewi@gentoo.org> wrote:

> I did just have a lightbulb moment though. I've been playing with
> unshare recently and I wondered if we could leverage it here.
> 
>   $ sudo unshare -m /bin/sh -c "mount --bind /mnt/somewhere/etc /etc && groupadd foo"
>   groupadd: Cannot determine your user name.

Aha! I was trying to do this against an NFS share for a system with a
different architecture. If I use a local mount with a compatible
architecture, it actually does work. I'll explore this some more.

-- 
James Le Cuirot (chewi)
Gentoo Linux Developer