code: def _get_qemu_img(self):
          
          qemu_img_path = ""
          qemu_path_dir = os.path.dirname(self.qemu_path)
          try:
              for f in os.listdir(qemu_path_dir):
                  if f.startswith("qemu-img"):
                      qemu_img_path = os.path.join(qemu_path_dir, f)
          except OSError as e:
              raise QemuError("Error while looking for qemu-img in {}: {}".format(qemu_path_dir, e))
  
          if not qemu_img_path:
              raise QemuError("Could not find qemu-img in {}".format(qemu_path_dir))
  
          return qemu_img_path
docs: Search the qemu-img binary in the same binary of the qemu binary
          for avoiding version incompatibily.
  
          :returns: qemu-img path or raise an error