From: Shawn O. Pearce <spearce@spearce.org>
Date: Wed, 26 Aug 2009 08:22:56 GMT
Subject: Re: [PATCH] fix simple deepening of a repo
Message-ID: <20090826082256.GO1033@spearce.org>
In-Reply-To: <4A94DF84.4050906@viscovery.net>

Johannes Sixt <j.sixt@viscovery.net> wrote:
> Shawn O. Pearce schrieb:
> >  static void upload_pack(void)
> >  {
> >  	reset_timeout();
> > -	head_ref(send_ref, NULL);
> > -	for_each_ref(send_ref, NULL);
> > -	packet_flush(1);
> > +	head_ref(scan_ref, NULL);
> > +	for_each_ref(scan_ref, NULL);
> > +
> > +	push_advertise("HEAD");
> > +	push_advertise("refs/heads/*");
> > +	push_advertise("refs/tags/*");
> > +	send_refs();
> > +
> 
> How will this mesh with 'git clone --mirror'?

Not well.

> Is the client expected to
> ask with 'expand refs/*'?

If the client is new enough to understand the "expand" extension,
yes, it would ask for "expand refs/*" and get everthing, allowing
it to complete a full mirror.

If the client is older and doesn't know this extension, then it
is hopeless.  The server isn't advertising refs/*, doesn't know
that the client can't ask for refs/*, and the client doesn't know
it is missing refs when it makes the mirror.

This backwards incompatible breakage is something I have no real
solution for.  :-|

-- 
Shawn.