make-iso9660-image: use `__structuredAttrs`

stdenv.mkDerivation {

  name = isoName;

  builder = ./make-iso9660-image.sh;

  __structuredAttrs = true;

  buildCommandPath = ./make-iso9660-image.sh;

  nativeBuildInputs = [ xorriso syslinux zstd libossp_uuid ];

  inherit isoName bootable bootImage compressImage volumeID efiBootImage efiBootable isohybridMbrImage usbBootable;

  # !!! should use XML.

  sources = map (x: x.source) contents;

  targets = map (x: x.target) contents;

  # !!! should use XML.

  objects = map (x: x.object) storeContents;

  symlinks = map (x: x.symlink) storeContents;

source $stdenv/setup

sources_=($sources)

targets_=($targets)

objects=($objects)

symlinks=($symlinks)

# Remove the initial slash from a path, since genisofs likes it that way.

stripSlash() {

    res="$1"

    # The -boot-info-table option modifies the $bootImage file, so

    # find it in `contents' and make a copy of it (since the original

    # is read-only in the Nix store...).

    for ((i = 0; i < ${#targets_[@]}; i++)); do

        stripSlash "${targets_[$i]}"

    for ((i = 0; i < ${#targets[@]}; i++)); do

        stripSlash "${targets[$i]}"

        if test "$res" = "$bootImage"; then

            echo "copying the boot image ${sources_[$i]}"

            cp "${sources_[$i]}" boot.img

            echo "copying the boot image ${sources[$i]}"

            cp "${sources[$i]}" boot.img

            chmod u+w boot.img

            sources_[$i]=boot.img

            sources[$i]=boot.img

        fi

    done

# Add the individual files.

for ((i = 0; i < ${#targets_[@]}; i++)); do

    stripSlash "${targets_[$i]}"

    addPath "$res" "${sources_[$i]}"

for ((i = 0; i < ${#targets[@]}; i++)); do

    stripSlash "${targets[$i]}"

    addPath "$res" "${sources[$i]}"

done