Re: [PATCH] prune: --expire=time

Junio C Hamano [off-list ref] wrote:

The way we might want to address this would be when 'clone -s'
makes a new repository that borrows from an existing repository,
we could make a symlink under .git/refs/borrowers/ in the
original repository that points at .git/refs directory of the
cloned repository -- you can do that by hand today and it would
be much nicer than having to specify the other repository when
running 'git prune' as the example suggests.

Unrelated topic: We may also want to consider doing the reverse,
that is symlink '.git/refs/borrows-from' of the cloned repository
to '.git/refs' in the original repository.  This way pushing into
the cloned repository can avoid uploading objects which the cloned
repository already has access to via its objects/info/alternates
setup.

This would especially be nice with project forks, such as on
repo.or.cz.  I don't need to upload all of 'master' if it has
already been uploaded by pasky's mirror job, for example.

-- 
Shawn.