[buildd-tools-devel] Bug#563957: Bug#563957: schroot should support aufs for chroots

[Roger Leigh]

On Wed, Jan 06, 2010 at 05:20:30PM +0100, Julian Andres Klode wrote:
> Package: schroot
> Severity: wishlist
> 
> It seems that aufs would be a good idea to support in schroot. It's faster
> and more efficient than LVM; and should be equally reliable. We are shipping
> it in our kernel (mostly because Debian Live needs it) and it just works.

Completely agreed.  If you check out the version of schroot in
experimental (1.3.2-1), this has support for unionfs/aufs
overlays.  This support is new and should work just fine, but
I would be very grateful for any feedback regarding it--even
just to let me know it's working OK!  See schroot.conf(5) for
the additional union options you need to add to your existing
configuration.

This should go into unstable and then testing in the next few
weeks, since it's believed to be stable and fully functional.

The only limitation is that the union overlay under
/var/lib/schroot/overlay must not be the same physical filesystem
as the underlying mount (bind mounted under
/var/lib/schroot/underlay).  AFAIK this is due to a limitation in
aufs which requires separate filesystems.  If you have a separate
/var this shouldn't be an issue, but if you have directory chroots
on the same filesystem, you might run into issues (this is again
something I would like to know more about--I'll put in
appropriate diagnostics if you can confirm this is the case).


Regards,
Roger

-- 
  .''`.  Roger Leigh
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