From: Junio C Hamano <junkio@cox.net>
Date: Thu, 10 Nov 2005 00:15:17 GMT
Subject: Re: [PATCH 0/4] Add git-pack-intersect
Message-ID: <7vy83x73ze.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <43728523.1040209@etek.chalmers.se>

Lukas Sandström <lukass@etek.chalmers.se> writes:

> Perhaps if git-daemon ever does caching of packfiles, removing the smaller
> packfiles might not be optimal.

Ah, that reminds me of something.

I did not advertise it too much, but you can put a prepackaged
packs in $GIT_DIR/pack-cache/ and it is used when upload-pack
notices it is creating that exact pack.

This is useless for ordinary repository, but can be useful for
historical repositories whose heads/tags never change (e.g. the
Linux kernel repository resurrected from bkcvs).  There you
could:

	$ git repack -a -d
	$ ln $GIT_DIR/objects/pack/pack-* $GIT_DIR/pack-cache/.

and a clone request would feed the pack, without regenerating
the pack data from scratch.  upload-pack still reads, sorts and
computes SHA1 hash of the list of objects to find the pack name,
but that is a fairly quick operation, compared to the rest of
the pack generation process.