make-{iso9660-image,squashfs,system-tarball}: drop references to build closure (#425700)

  name = isoName;

  __structuredAttrs = true;

  # the image will be self-contained so we can drop references

  # to the closure that was used to build it

  unsafeDiscardReferences.out = true;

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

  nativeBuildInputs = [

    xorriso

  name = "${fileName}${lib.optionalString (!hydraBuildProduct) ".img"}";

  __structuredAttrs = true;

  # the image will be self-contained so we can drop references

  # to the closure that was used to build it

  unsafeDiscardReferences.out = true;

  nativeBuildInputs = [ squashfsTools ];

  buildCommand = ''

stdenv.mkDerivation {

  name = "tarball";

  builder = ./make-system-tarball.sh;

  __structuredAttrs = true;

  # the tarball will be self-contained so we can drop references

  # to the closure that was used to build it

  unsafeDiscardReferences.out = true;

  buildCommandPath = ./make-system-tarball.sh;

  nativeBuildInputs = extraInputs;

  inherit

    compressCommand

    ;

  # !!! should use XML.

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

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

  # !!! should use XML.

  inherit symlinks objects;

  closureInfo = closureInfo {

sources_=($sources)

targets_=($targets)

objects=($objects)

symlinks=($symlinks)

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

stripSlash() {

    res="$1"

}

# Add the individual files.

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

    stripSlash "${targets_[$i]}"

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

    stripSlash "${targets[$i]}"

    mkdir -p "$(dirname "$res")"

    cp -a "${sources_[$i]}" "$res"

    cp -a "${sources[$i]}" "$res"

done