Current situation of amarok, and of latex tools

[Christopher James Halse Rogers]

On Mon, 2009-05-25 at 03:03 +0100, Dmitrijs Ledkovs wrote:
> 2009/5/25 Christopher James Halse Rogers <raof at ubuntu.com>:
> > Having some sort of "roll back to previous package version" button might
> > be a nice idea, though it would need to be designed in such a way that
> > made it clear there was no guarantee that it'd work.  I'm not sure
> > whether we'd be doing users a favour here.
> >
> 
> There is a technology to do this but it's not GPL...
> 
> OpenSolaris and Nexetra use ZFS which supports snapshots. Before each
> package installation transaction (i.e. one upgrade of N packages) they
> take a snapshot of a system, do the upgrade. If the user doesn't like
> it, they can rollback to any of the previous snapshots because they
> are available.

Won't that only be an acceptable solution if the user is willing to
throw away all the work they've done since the package upgrade?  ZFS is
cool and all, but this doesn't seem to address any of the hard parts of
why downgrades aren't supported now.