Refactor

  # Auto update the agent

  if curl -s -f -k -m 5 -o "${TMP}" https://raw.githubusercontent.com/kroese/virtual-dsm/master/agent/agent.sh; then

    if [ -f "${TMP}" ]; then

  if ! curl -s -f -k -m 5 -o "${TMP}" https://raw.githubusercontent.com/kroese/virtual-dsm/master/agent/agent.sh; then

    echo "$HEADER: update error: $?" && return

  fi

  if [ ! -f "${TMP}" ]; then

    echo "$HEADER: update error, file not found.." && return

  fi

  line=$(head -1 "${TMP}")

      if [ "$line" == "#!/usr/bin/env bash" ]; then

  if [ "$line" != "#!/usr/bin/env bash" ]; then

    echo "$HEADER: update error, invalid header: $line" && return

  fi

  SCRIPT=$(readlink -f ${BASH_SOURCE[0]})

  if ! cmp --silent -- "${TMP}" "${SCRIPT}"; then

    mv -f "${TMP}" "${SCRIPT}"

    chmod +x "${SCRIPT}"

    echo "$HEADER: succesfully installed update."

  else

    echo "$HEADER: Update not needed."

  fi

      else

         echo "$HEADER: update error, invalid header: $line"

      fi

    else

      echo "$HEADER: update error, file not found.."

    fi

  else

    echo "$HEADER: update error, curl error: $?"

  fi

}

function installPackages {