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