Exec upload-pack on remote with what parameters to get direntries.

Hi,

I've got a custom ssh library which I use to make a connection to a
git server like www.github.com, user stefbon.

Now I want to get the direntries of a remote repo, and I know I have
to use upload-pack for that, but with what parameters?

I want to use the outcome to make a fuse fs, user can browse the
files. Possibly the user can also view the contents.

Stef