Re: Linux 2.6.15-rc2

From: Junio C Hamano <junkio@cox.net>
Date: Nov 24, 2005, 21:02 UTC
Message-ID: <7vveyhpxmy.fsf@assigned-by-dhcp.cox.net>
In-Reply-To: <Pine.LNX.4.64.0511241154340.13959@g5.osdl.org>

Linus Torvalds <torvalds@osdl.org> writes:

> Since git-pack-objects has to generate the pack _anyway_, it might as well 
> save it away when it does - so that if you have lots of people doing 
> clones or pulling, you'd only need to run it once for a particular set of 
> objects, and you'd not have to do any extra (or unnecessary) maintenance.

Caching itself is relatively easy (just implement an equivalent of tee inside pack-objects ourselves). More problematic is pruning. We could do it from cron based on atime _if_ the filesystem is not mounted noatime but without arranging a reasonably way for automated pruning this would become a disk hog and extra maintenance burden, which is why I did not implement the dynamic caching part in the initial round.

Since git-daemon would be the primary user of pack-cache/, this implies a repository writable by git-daemon user on public machine (not master), which is an extra thing to note.