Information about cloning operations

[Stefano]

Hello,
I'm looking for a way to provide more information about what's going on during
cloning operations (read as: progress bar)...

As far as I can see the needed information is at revlog.py level (addgroup) but
there we don't have access to ui, while at an higher level we have
addchangegroup
(localrepo.py) but here we can just provide one progress.update before the
changesets step, another one before the manifests step etc... and the result is
not so useful.

Any ideas?

Cheers,
Stefano