From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 07 Jul 2011 19:34:37 GMT
Subject: Re: generation numbers
Message-ID: <7vliw9hoky.fsf@alter.siamese.dyndns.org>
In-Reply-To: <20110707185908.GB12044@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

> You could "cheat" and instead of storing the sha1 of a blob object in
> the notes tree, use the lower 32 bits to store an actual value. I don't
> think that currently breaks any assumptions in the notes code, but it
> definitely is against the intent of it.

I highly suspect that it would break fsck rather badly.  You may not even
be able to repack a repository with such a notes tree.

> For a local lookup cache, I would use a fixed-size binary integer just
> to keep the lookup data structure simple (then you know the width of
> each record ahead of time). For a generation commit header, obviously we
> would go with the ascii representation as we do for other headers.

Yes.