On Mon, Oct 15, 2012 at 11:56 AM, Jeff King <p...@peff.net> wrote:
> Right. The only thing that needs locking is the refs, because the object
> database is add-only for normal operations, and by definition collisions
> mean you have the same content (or are astronomically unlucky, but your
> consolation prize is that you can write a paper on how you found a sha1
> collision).

Its worth nothing that a SHA-1 collision can be identified at the
server because the server performs a byte-for-byte compare of both
copies of the object to make sure they match exactly in every way. Its
not fast, but its safe. :-)
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