final: prev: {
  ensureZfsMounts = prev.writeShellApplication {
    name = "zfsEnsureMounted";
    runtimeInputs = with prev; [
      zfs
      gawk
      coreutils
    ];

    text = ''
       #!/bin/sh

       if [[ "$#" -eq "0" ]]; then
          echo "no arguments passed"
          exit 1
       fi

      MOUNTED=$(zfs list -o mountpoint,mounted -H | awk '$NF == "yes" {$NF=""; print $0}' | sed 's/[[:space:]]*$//')

       MISSING=""
       for target in "$@"; do
          if ! echo "$MOUNTED" | grep -Fxq "$target"; then
             MISSING="$MISSING $target"
          fi
       done

       if [[ -n "$MISSING" ]]; then
          echo "FAILURE, missing:$MISSING" 1>&2
          exit 1
       fi
    '';
  };

  reflac = prev.writeShellApplication {
    name = "reflac";
    runtimeInputs = with prev; [ flac ];
    excludeShellChecks = [ "2086" ];

    text = builtins.readFile (
      prev.fetchurl {
        url = "https://raw.githubusercontent.com/chungy/reflac/refs/heads/master/reflac";
        sha256 = "61c6cc8be3d276c6714e68b55e5de0e6491f50bbf195233073dbce14a1e278a7";
      }
    );
  };

  list-usb-drives = prev.writeShellApplication {
    name = "list-usb-drives";
    runtimeInputs = with prev; [
      findutils
      coreutils
    ];

    text = ''
      find "/dev/disk/by-id" -name "usb*" -not -name "*-part[0-9]" -printf "%f\n" | sed 's/^usb\-//g' | sed 's/\-[0-9]*\:/ /g' | column -t --table-columns=DRIVE,BAY | sort -n -k 2
    '';
  };
}