pkgs.vmTools.extractFs

The following is the current implementation of this function.

{
      file,
      fs ? null,
    }:
    runInLinuxVM (
      stdenv.mkDerivation {
        name = "extract-file";
        buildInputs = [ util-linux ];
        buildCommand = ''
          ln -s ${kernelModules}/lib /lib
          ${kmod}/bin/modprobe loop
          ${kmod}/bin/modprobe ext4
          ${kmod}/bin/modprobe hfs
          ${kmod}/bin/modprobe hfsplus
          ${kmod}/bin/modprobe squashfs
          ${kmod}/bin/modprobe iso9660
          ${kmod}/bin/modprobe ufs
          ${kmod}/bin/modprobe cramfs

          mkdir -p $out
          mkdir -p tmp
          mount -o loop,ro,ufstype=44bsd ${lib.optionalString (fs != null) "-t ${fs} "}${file} tmp ||
            mount -o loop,ro ${lib.optionalString (fs != null) "-t ${fs} "}${file} tmp
          cp -Rv tmp/* $out/ || exit 0
        '';
      }
    )