Re: More precise tag following

Junio C Hamano [off-list ref] writes:

What if (I know, this discussion does not belong here until
1.5.0 final) we had a "reverse" database that keeps track of
what tag references which object, and "git rev-list" knows how
to exploit it?  That is, just like generating a list of objects
that are reachable with --objects option, if we can add a new
option --with-tag very cheaply to list tag objects that would
reach what are in the generated list of objects?
...
Just an idle thought.

Nah, that would not work.  Please disregard.

The thing is, you cannot sanely traverse and transfer objects
that have such reverse connectivity.  The other end can annotate
a commit long after you acquired it, and trying to make
git-fetch to retrieve newly created annotations would mean
breaking "things reachable from your local refs are complete and
there is nothing missing from them" invariant.  Pushing into
somebody else after annotating an old commit that already exists
at the other end has the same issue.