nixfiles/extras/mk-raspberry-ext-drive.nix

{
  util-linux,
  cryptsetup,
  btrfs-progs,
  writeShellApplication,
}: let
  externalDriveData = import ../data/drives/raspberryExternalDrive.nix;
in
  writeShellApplication {
    name = "mk-raspberry-ext-drive";
    runtimeInputs = [
      util-linux
      cryptsetup
      btrfs-progs
    ];
    text = ''
      if [ -z "''${1-}" ]; then
        echo "Please specify a path to device as first argument"
        exit 1
      fi

      DRIVE_PATH=$1

      if [ -z "''${2-}" ]; then
        echo "Please specify a key file to use"
        exit 1
      fi

      KEY_FILE=$2

      if [ -z "''${3-}" ]; then
        echo "Please specify a temp mountpoint to use"
        exit 1
      fi

      TEMP_MOUNTPOINT=$3

      if [ "$EUID" -ne 0 ]; then
        echo "Please run as root"
        exit
      fi
      echo "Wiping Partitions..."
      wipefs --all "$DRIVE_PATH"

      echo "Creating Encrypted Partition"
      cryptsetup luksFormat "$DRIVE_PATH" --key-file "$KEY_FILE" --label "${externalDriveData.encryptedLabel}"

      echo "Opening Encrypted Partition"
      cryptsetup open "$DRIVE_PATH" "mk-raspberry-ext-drive" --key-file "$KEY_FILE"

      echo "Formatting Encrypted Filesystem"
      mkfs.btrfs -L "${externalDriveData.unencryptedLabel}" /dev/mapper/mk-raspberry-ext-drive

      echo "Mounting Partition"
      mount -t btrfs /dev/mapper/mk-raspberry-ext-drive "$TEMP_MOUNTPOINT"

      echo "Creating Folders"
      mkdir "$TEMP_MOUNTPOINT/backups"
      mkdir "$TEMP_MOUNTPOINT/storage"
      mkdir "$TEMP_MOUNTPOINT/extras"

      echo "Unmounting"
      umount "$TEMP_MOUNTPOINT"

      echo "Closing mapper device"
      cryptsetup close "mk-raspberry-ext-drive"
    '';
  }