This helper uses specified file descriptors to connect to a remote Git server.
This is not meant for end users but for programs and scripts calling git
fetch, push, or archive.
If only <infd> is given, it is assumed to be a bidirectional socket connected
to a remote Git server (git-upload-pack, git-receive-pack, or
git-upload-archive). If both <infd> and <outfd> are given, they are assumed
to be pipes connected to a remote Git server (<infd> being the inbound pipe
and <outfd> being the outbound pipe).
It is assumed that any handshaking procedures have already been completed
(such as sending service request for git://) before this helper is started.
<anything> can be any string. It is ignored. It is meant for providing
information to the user in the URL in case that URL is displayed in some
context.