Re: [PATCH] Teach receive-pack how to keep pack files when unpacklooseobjects = 0.

Nicolas Pitre [off-list ref] writes:

Why not just parse the pack header in receive-pack / fetch-pack, and 
decide on the first-hand information?  Sure the pack header is then 
gone, but then the only thing that is needed is an extra flag to both 
unpack-objects and index-pack to tell them that we've already parsed the 
pack header and that the pack version is x and the number of objects is 
y.  Simply something like --pack_header=x,y.  No protocol extension 
needed, no extra rev-list, no reliance on the remote server providing 
the needed info.

I like it.

Because that approach assumes recieve-pack and unpack-objects
and index-pack are from the same vintage (otherwise your
receive-pack would need to have a way to see if unpack-objects
and index-pack would grok --pack_header argument), we could even
get away without passing the pack version if we wanted to.