{
  squashfsTools,

  closureInfo,
  runCommand
}:
{
  filename ? "image",
  storeContents ? [],
  comp ? "xz -Xdict-size 100%"
}:
let
  compFlag = if comp == null then "-no-compression" else "-comp ${comp}";
in runCommand "${filename}.squashfs" {
  nativeBuildInputs = [ squashfsTools ];
} ''
  closureInfo=${closureInfo { rootPaths = storeContents; }}
  cp $closureInfo/registration nix-path-registration

  mksquashfs nix-path-registration $(cat $closureInfo/store-paths) $out \
      -no-hardlinks -keep-as-directory -all-root -b 1048576 ${compFlag} \
      -processors $NIX_BUILD_CORES
''