Log of test code and output.

dulwich_fetch.log

$ cat test.py 
from dulwich.client import TCPGitClient
from dulwich.repo import Repo
from dulwich.server import DictBackend, TCPGitServer
import sys
import threading

repo = Repo.init("remote", mkdir=True)
cid = repo.do_commit("message", committer="Jelmer <jelmer@samba.org>")
backend = DictBackend({'/': repo})
dul_server = TCPGitServer(backend, 'localhost', 0)
threading.Thread(target=dul_server.serve).start()
server_address, server_port = dul_server.socket.getsockname()

client = TCPGitClient(server_address, server_port)

local = Repo.init("local", mkdir=True)
remote_refs = client.fetch("/", local, progress=sys.stdout.write)

dul_server.shutdown()

$ python test.py 
dul-daemon says what
counting objects: 2, done.
how was that, then?