git protocol specification

[Tom Werner <pubsub@xxxxxxxxxxxxxxxxx>]

I'm working on a flexible Erlang replacement for git-daemon and would 
like to know if there is a specification available for the protocol that 
git-upload-pack and git-receive-pack use. I've reverse engineered it but 
have come across some points that seem inconsistent. Before I dig into 
the C code in earnest I wanted to see if there's anything like spec 
document for the system. Thanks!

--
Tom Preston-Werner
github.com/mojombo

begin:vcard
fn:Tom Preston-Werner
n:Preston-Werner;Tom
email;internet:tom@xxxxxxxxxxx
tel;cell:760.672.0832
x-mozilla-html:FALSE
version:2.1
end:vcard