44 lines
1.5 KiB
Nix
44 lines
1.5 KiB
Nix
# Provide an initial copy of the NixOS channel so that the user
|
|
# doesn't need to run "nix-channel --update" first.
|
|
|
|
{ config, pkgs, ... }:
|
|
|
|
with pkgs.lib;
|
|
|
|
let
|
|
|
|
# We need a copy of the Nix expressions for Nixpkgs and NixOS on the
|
|
# CD. These are installed into the "nixos" channel of the root
|
|
# user, as expected by nixos-rebuild/nixos-install.
|
|
channelSources = pkgs.runCommand "nixos-${config.system.nixosVersion}"
|
|
{ expr = readFile ../../../lib/channel-expr.nix; }
|
|
''
|
|
mkdir -p $out/nixos
|
|
cp -prd ${pkgs.path} $out/nixos/nixpkgs
|
|
ln -s nixpkgs/nixos $out/nixos/nixos
|
|
chmod -R u+w $out/nixos
|
|
rm -rf $out/nixos/nixpkgs/.git
|
|
echo -n ${config.system.nixosVersion} > $out/nixos/nixpkgs/.version
|
|
echo -n "" > $out/nixos/nixpkgs/.version-suffix
|
|
echo "$expr" > $out/nixos/default.nix
|
|
'';
|
|
|
|
in
|
|
|
|
{
|
|
# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
|
|
# for nixos-install.
|
|
boot.postBootCommands =
|
|
''
|
|
if ! [ -e /var/lib/nixos/did-channel-init ]; then
|
|
echo "unpacking the NixOS/Nixpkgs sources..."
|
|
mkdir -p /nix/var/nix/profiles/per-user/root
|
|
${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels \
|
|
-i ${channelSources} --quiet --option use-substitutes false
|
|
mkdir -m 0700 -p /root/.nix-defexpr
|
|
ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels
|
|
mkdir -m 0755 -p /var/lib/nixos
|
|
touch /var/lib/nixos/did-channel-init
|
|
fi
|
|
'';
|
|
}
|