[buildd-tools-devel] Bug#783701: sbuild: sbuild-createchroot copies /etc/passwd from host?

[Johannes Schauer]

Control: tag -1 + unreproducible moreinfo

Hi,

On Wed, 29 Apr 2015 11:25:49 +0100 Edmund Grimley Evans <edmund.grimley.evans at gmail.com> wrote:
> A chroot created with sbuild-createchroot seems to inherit /etc/passwd and
> /etc/group from the host. In a couple of cases this resulted in packages
> failing to build in the chroot:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783695
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=783698
> 
> I think it would be better if the chroot got a fresh, minimal
> /etc/passwd and /etc/group.
> 
> I can't find the code that copies /etc/passwd, so perhaps there's already an
> option to modify that behaviour that I am unaware of.

after running:

$ sudo sbuild-createchroot --make-sbuild-tarball=/srv/chroot/unstable-amd64.tar.gz unstable tmp http://httpredir.debian.org/debian

I see:

$ tar --to-stdout -xf /srv/chroot/unstable-amd64.tar.gz ./etc/passwd
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false
systemd-network:x:101:103:systemd Network Management,,,:/run/systemd/netif:/bin/false
systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd/resolve:/bin/false
systemd-bus-proxy:x:103:105:systemd Bus Proxy,,,:/run/systemd:/bin/false
_apt:x:104:65534::/nonexistent:/bin/false
sbuild:x:108:113:Debian source builder,,,:/var/lib/sbuild:/bin/bash


This is *not* the /etc/passwd from my system.

Can you show me how you ended up with a chroot that inherited your /etc/passwd?

Thanks!

cheers, josch
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