On Thu, Sep 27, 2012 at 02:33:01PM -0700, Junio C Hamano wrote:

> Jeff King <p...@peff.net> writes:
> > So yeah, we would want to put the pack trailer sha1 into the
> > supplementary index file, and check that it matches when we open it.
> > It's a slight annoyance, but it's O(1).
> Yes.  If I am not mistaken, that is exactly how an .idx file makes
> sure that it describes the matching .pack file (it has packfile
> checksum in its trailer).  Otherwise you can repack the same set of
> objects into a new .pack file and make existing .idx very confused.

Yeah. In theory you wouldn't name the new packfile into place without
also generating a new index for it. But even if you do it right, there's
a race condition, and checking the trailer sha1 at least lets us know
that they don't match (I assume we just reject the index, then; I guess
this can result in an operation failing, but in practice it doesn't
really happen, as we don't bother packing unless there are actually new

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