per-user git daemon service

 userv-git-daemon allows users to publish git repositories which will
 be published via the git protocol on 9418. This is a bit like
 git-daemon except that the actual reading of each user's repositories
 is done as that user.
 .
 The default configuration does nothing: you must (a) manually copy
 the line from /usr/share/doc/examples/userv-git-daemon.inetd into
 /etc/inetd.conf and (b) specifically list hostnames and target
 directories in /etc/userv/git-urlmap.