git peer-to-peer project: info needed

hi folks,

[please could you kindly cc on responses because i am subscribed with "no mail" set]

i need some guidance on what i should be doing, to add peer-to-peer networking to "git fetch". i can take care of the peer-to-peer networking side: the bit i'm unsure about is what sequence of events are required to happen. i'm presently looking at the use of walker_fetch in builtin-http-fetch.c which gives me some idea. however as i aim to implement this first in python not c, i need to be using git via command-line only.

perhaps... does anyone know of an implementation of "git fetch" in say... shell-script (or perhaps in python) or just absolutely any language _other_ than c?

i believe... i believe i may need the git rev-list and git pack-objects commands, would that be right? rev-list gives the list of commit revisions; pack-objects, if i can merely transfer the .pack file and .index file over the peer-to-peer network, the job's half done, am i right?

(the only missing step is to have a way to find the list of objects at the remote end - i know how to do that)

following that, i can do "git unpack-objects" on the .pack file(s)

and... i've just done a test on that (manually, by running git-pack-objects --thin --all --stdout and then git-unpack-objects) ... um.... :) i'm missing the "tag updating", aren't i? the objects are now in the .git repo but they're "hanging about", as can be seen with git fsck:

$ git fsck dangling commit af87b49b9fbcae28ae19b86ca04af5bd4a9f6778

so... my next step iis... ermm... update the head ref? err? :) i see that gitpython is simply writing [the above ref] into .git/ref/heads/master or whereever is specified (must begin with refs) which is kinda cheating but perfectly reasonable... err.. but wait... i'm into what "git-pull.sh" is doing at this point, aren't i?

soo... i kinda don't have to worry about that bit, am i right? as long as i get to complete the "git-unpack-objects" stage, the rest can be handled by git-pull.sh, am i right?

much obliged some answers so that i can get this done, as free software, and provide people with a peer-to-peer distributed version of git.

l.