# This module generates the nixos-checkout script, which replaces the # NixOS and Nixpkgs source trees in /etc/nixos/{nixos,nixpkgs} with # Git checkouts. {config, pkgs, ...}: with pkgs.lib; let nixosCheckout = pkgs.substituteAll { name = "nixos-checkout"; dir = "bin"; isExecutable = true; src = pkgs.writeScript "nixos-checkout" '' #! ${pkgs.stdenv.shell} -e if [ -z "$1" ] || [ "$1" == "-h" ] || [ "$1" == "--help" ]; then echo "Usage: `basename $0` PREFIX. See NixOS Manual for more info." exit 0 fi prefix="$1" if [ -z "$prefix" ]; then prefix=/etc/nixos; fi mkdir -p "$prefix" cd "$prefix" if [ -z "$(type -P git)" ]; then echo "installing Git..." nix-env -iA nixos.pkgs.git || nix-env -i git fi # Move any old nixos or nixpkgs directories out of the way. backupTimestamp=$(date "+%Y%m%d%H%M%S") if [ -e nixos -a ! -e nixos/.git ]; then mv nixos nixos-$backupTimestamp fi if [ -e nixpkgs -a ! -e nixpkgs/.git ]; then mv nixpkgs nixpkgs-$backupTimestamp fi # Check out the NixOS and Nixpkgs sources. git clone git://github.com/NixOS/nixos.git nixos git clone git://github.com/NixOS/nixpkgs.git nixpkgs ''; }; in { environment.systemPackages = [ nixosCheckout ]; }