pkgs.vmTools.debClosureGenerator

The following is the current implementation of this function.

debClosureGenerator =
    {
      name,
      packagesLists,
      urlPrefix,
      packages,
    }:

    runCommand "${name}.nix"
      {
        nativeBuildInputs = [
          buildPackages.perl
          buildPackages.dpkg
          pkgs.nixfmt-rfc-style
        ];
      }
      ''
        for i in ${toString packagesLists}; do
          echo "adding $i..."
          case $i in
            *.xz | *.lzma)
              xz -d < $i >> ./Packages
              ;;
            *.bz2)
              bunzip2 < $i >> ./Packages
              ;;
            *.gz)
              gzip -dc < $i >> ./Packages
              ;;
          esac
        done

        perl -w ${deb/deb-closure.pl} \
          ./Packages ${urlPrefix} ${toString packages} > $out
        nixfmt $out
      '';