Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:
% git remote add channels git://github.com/NixOS/nixpkgs-channels.git
For stability and maximum binary package support, it is recommended to maintain custom changes on top of one of the channels, e.g.
nixos-18.03 for the latest release and
nixos-unstable for the latest successful build of master:
% git remote update channels % git rebase channels/nixos-18.03
For pull-requests, please rebase onto nixpkgs
NixOS Linux distribution source code is located inside