[buildd-tools-devel] Bug#728422: Bug#728422: sbuild: fails to getent group sbuild when running with init=/bin/systemd

[Roger Leigh]

On Fri, Nov 01, 2013 at 03:14:05AM +0100, Cyril Brulebois wrote:
> The last bit failed with:
> | D: Running command: schroot -d / -c sid-amd64-sbuild-59d745d4-bd00-4c4d-82cb-1b21032d8205 --run-session -q -u root -p -- getent group sbuild
> | /bin/sh: 1: cannot create /var/lib/schroot/mount/sid-amd64-sbuild-59d745d4-bd00-4c4d-82cb-1b21032d8205/etc/group: Permission denied
> | E: Failed to create group sbuild
> | Failed to set up chroot
> 
> Looking at the "mount" output, that reminded me I was running under
> systemd, so I wondered whether switching it off would help. And it
> helped indeed!
> 
> I suspect there's some interference between some schroot things and
> systemd, but filing it against sbuild for now, since that's where I
> hit the bug so far.

The failure is trying to run

  getent group sbuild >> ${chroot}/etc/group

However, this only works as root, and it's only used as a fallback
in the unusual case that the passwd/group databases in the chroot
are out of sync with the base system.  The real question here is
why the system databases weren't copied over during the session
setup.

I would suggest trying to run schroot without sbuild and see that
if you start a new session with

  schroot -b -n test -c sid-amd64-sbuild -v --debug=notice

and see if there is anything group-related in the output.
After this completes, is there a group file in the schroot
directory?  Does

  schroot -r -c test -- getent group sbuild

succeed or fail?

Does "getent group sbuild" work correctly on the base system when
systemd is running?  How about "getent group"?

sbuild and schroot don't really do anything which should be
affected by the init system in use.  Both just make use of
standard POSIX interfaces, and if systemd causes changes in
how these basic libc calls function, that's a bit worrying.
The schroot db copy is as simple as

  getent $db >> $chroot/etc/$db

Any more information you could provide regarding the above would
be much appreciated.


Regards,
Roger

-- 
  .''`.  Roger Leigh
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