That repo is extremely out of date. The lsub.org guys (http://lsub.org/ls/nix.html) decided they'd prefer to roll their own "code review" system, and the nix-os repo was essentially abandoned. Apparently they've recently decided to stop using their own code review thing, and just make changes directly in their local tree while taking emailed diffs from everyone else, so there's that.

Edit: oh, and Erik Quanstrom has started shipping the Nix kernel with his own set of patches in the 9atom distribution, if you can handle the hour+ download time for his ISO. There are some other nice improvements in 9atom, too.

Not to be confused with "NixOS", no dash, a Linux distro based on the Nix package manager. Sheesh, how many annoying names can we get into one thread? http://nixos.org/nixos/