{ pkgs ? import <nixpkgs> {}
, dir
, rebuildarg
, moreargs ? ""
}:

let
  diskId = (import ((builtins.getEnv "PWD")+"/${dir}/hw.nix") {}).hardware.encryptedDisk.diskId;
  GIT_ROOT=''''$(git rev-parse --show-toplevel)'';

in {
  rebuild = pkgs.writeScript "script" ''
    #!/usr/bin/env bash
    set -xe

    pushd ${GIT_ROOT}/${dir}
    export NIXOS_CONFIG="$PWD"/configuration.nix
    export INSTALL_ROOT="/mnt/$ID-root"

    [[ -e "''${NIXOS_CONFIG}" ]]

    nixos-rebuild -I nixos-config=''${NIXOS_CONFIG} ${rebuildarg} ${moreargs}
    if test -L result; then
      rm result
    fi
  '';

  diskMount = pkgs.writeScript "script" ''
    #!/usr/bin/env bash
    set -xe
    ID=${diskId}
    echo Mounting $ID
    set -xe
    cryptsetup luksOpen /dev/disk/by-partlabel/$ID-part3 $ID-part3
    vgchange -ay $ID
    mkdir -p /mnt/$ID-root
    mount /dev/$ID/root /mnt/$ID-root -o subvol=nixos
    mount /dev/$ID/root /mnt/$ID-root/home -o subvol=home
    mount /dev/disk/by-partlabel/$ID-part2 /mnt/$ID-root/boot
  '';

  diskUmount = pkgs.writeScript "script" ''
    #!/usr/bin/env bash
    set -xe
      ID=${diskId}
    umount -R /mnt/$ID-root
    rmdir /mnt/$ID-root
    vgchange -an $ID
    cryptsetup luksClose $ID-part3
    sync
  '';

  diskInstall = pkgs.writeScript "script" ''
    #!/usr/bin/env bash
    set -xe
    ID=${diskId}
    pushd ${GIT_ROOT}/${dir}
    export NIXOS_CONFIG="$PWD"/configuration.nix
    export INSTALL_ROOT="/mnt/$ID-root"

    [[ -e "''${NIXOS_CONFIG}" ]]
    [[ -e "''${INSTALL_ROOT}" ]]

    nixos-install --max-jobs 5 --cores 4  --no-channel-copy --no-root-passwd --root "''${INSTALL_ROOT}"
  '';
}