nixpkgs/modules/installer/tools/nixos-checkout.nix

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# This module generates the nixos-checkout script, which replaces the
# NixOS and Nixpkgs source trees in /etc/nixos/{nixos,nixpkgs} with
# Subversion 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
prefix="$1"
if [ -z "$prefix" ]; then prefix=/etc/nixos; fi
mkdir -p "$prefix"
cd "$prefix"
# Move any old nixos or nixpkgs directories out of the way.
backupTimestamp=$(date "+%Y%m%d%H%M%S")
if test -e nixos -a ! -e nixos/.svn; then
mv nixos nixos-$backupTimestamp
fi
if test -e nixpkgs -a ! -e nixpkgs/.svn; then
mv nixpkgs nixpkgs-$backupTimestamp
fi
# Check out the NixOS and Nixpkgs sources.
${pkgs.subversion}/bin/svn co https://nixos.org/repos/nix/nixos/trunk nixos
${pkgs.subversion}/bin/svn co https://nixos.org/repos/nix/nixpkgs/trunk nixpkgs
'';
};
in
{
environment.systemPackages =
[ nixosCheckout
# Since the checkout script depends on Subversion, we may as
# well put it in $PATH.
pkgs.subversion
];
}