[Pkg-libvirt-maintainers] Bug#707201: Bug#707201: update cgroup layout

[Guido Günther]

On Wed, Oct 30, 2013 at 05:41:08PM +0100, Lorenzo M. Catucci wrote:
> Hi all;
> 	after getting the same cgroup errors after a test-upgrade of libvirt,
> I stumbled upon the wishlist report from Daniel Baumann archived at
> 
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=601757

This looks a bit like what we're adding to libvirt-bin atm:

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=725261
> 
> and tried the mountcgroupsubsys.sh script proposed by Marcus Osdoba as
> archived at
> 
> http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=45;filename=mountcgroupsubsys.sh;att=1;bug=601757
> 
> At least on my system, this restored libvirt/qemu functionality
> without doing any harm to lxc guests.

The problem here is different though, it's not the mounting per se
that's the problem - it's the newer libvirt that requires a different
cgroup layout. So if somebody wants to help fixing this (I haven't had
time to even reproduce it) one would need to check what we need to do in
the preinst/postinst to make the upgrade work automatically. If this
can't be done we need to abort the upgrade and ask the user to shutdown
all vms.
Cheers,
 -- Guido