Re: Resumable clone/Gittorrent (again) - stable packs?

From: Jeff King <peff@peff.net>
Date: Jan 7, 2011, 19:17 UTC
Message-ID: <20110107191719.GA6175@sigill.intra.peff.net>
In-Reply-To: <20110107185218.GA16645@LK-Perkele-VI.localdomain>

On Fri, Jan 07, 2011 at 08:52:18PM +0200, Ilari Liusvaara wrote:

Show 21 quoted lines

> On Fri, Jan 07, 2011 at 12:31:19AM -0500, Jeff King wrote:
> > 
> >   3. people on low-bandwidth servers who fork major projects; if I write
> >      three kernel patches and host a git server, I would really like
> >      people to only fetch my patches from me and get the rest of it from
> >      kernel.org
> 
> One client-side-only feature that could be useful:
> 
> Ability to contact multiple servers in sequence, each time advertising
> everything obtained so far. Then treat the new repo as clone of the last
> address.
> 
> This would e.g. be very handy if you happen to have local mirror of say, Linux
> kernel and want to fetch some related project without messing with alternates
> or downloading everything again:
> 
> git clone --use-mirror=~/repositories/linux-2.6 git://foo.example/linux-foo
> 
> This would first fetch everything from local source and then update that
> from remote, likely being vastly faster.

I'm not clear in your example what ~/repositories/linux-2.6 is. Is it a repo? In that case, isn't that basically the same as --reference? Or is it a local mirror list?

If the latter, then yeah, I think it is a good idea. Clients should definitely be able to ignore, override, or add to mirror lists provided by servers. The server can provide hints about useful mirrors, but it is up to the client to decide which methods are useful to it and which mirrors are closest.

Of course there are some servers who will want to do more than hint (e.g., the gentoo case where they really don't want people cloning from the main machine). For those cases, though, I think it is best to provide the hint and to reject clients who don't follow it (e.g., by barfing on somebody who tries to do a full clone). You have to implement that rejection layer anyway for older clients.

-Peff