On Tue, Feb 04, 2014 at 03:40:15PM -0800, Junio C Hamano wrote:

>  * Somehow this came to my private mailbox without Cc to list, so I
>    am forwarding it.
> 
>    I think with 1190a1ac (pack-objects: name pack files after
>    trailer hash, 2013-12-05), repacking the same set of objects may
>    have less chance of producing colliding names, especially if you
>    are on a box with more than one core, but it still would be a
>    good idea to get this part right in the upcoming release.

Actually, since 1190a1ac, if you have repacked and gotten the same pack
name, then you do not have to do any rename dance at all; you can throw
away what you just generated because you know that it is byte-for-byte
identical.

You could collide with a pack created by an older version of git that
used the original scheme, but that is quite unlikely (on the order of
2^-160).

-Peff
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