diff options
Diffstat (limited to 'nixos/modules/installer/cd-dvd/channel.nix')
-rw-r--r-- | nixos/modules/installer/cd-dvd/channel.nix | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/nixos/modules/installer/cd-dvd/channel.nix b/nixos/modules/installer/cd-dvd/channel.nix new file mode 100644 index 000000000000..bcf3dbb3f735 --- /dev/null +++ b/nixos/modules/installer/cd-dvd/channel.nix @@ -0,0 +1,44 @@ +# 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 = builtins.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 + ''; +} |