On Mon, Oct 15, 2012 at 6:05 PM, Matthieu Moy
> Angelo Borsotti <angelo.borso...@gmail.com> writes:
>> the push command checks first if the tips of the branches match those
>> of the remote references, and if it does uploads the snapshot.
> The update does two things: upload objects to the database, and then
> update the reference. Adding objects to the database does not change the
> repository until the objects are reachable from a ref. Updating the ref
> is usually done giving the expected old sha1, and locks the ref, so it
> can't change in the meantime.
> I don't know this part of the code very well, but check refs.c for the C
> part, and "git update-ref" for the plumbing interface.
I think it's lock_any_ref_for_update(), which is called inside
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