Auto update

  # TODO: Auto-update agent

  echo "Checking for updates.." > /dev/ttyS0

  rm -f /tmp/agent.sh

  TMP="/tmp/agent.sh"

  rm -f "${TMP}"

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

    if [ -f "/tmp/agent.sh" ]; then

      line=$(read -r FIRSTLINE < /tmp/agent.sh)

  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

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

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

         echo "Update found.." > /dev/ttyS0

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

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

         echo "Moved from ${TMP} to ${SCRIPT}" > /dev/ttyS0

      else

         echo "Update error 1.. $line" > /dev/ttyS0

         echo "Update error, invalid header: $line" > /dev/ttyS0

      fi

    else

      echo "Update error 2.." > /dev/ttyS0

      echo "Update error, file not found.." > /dev/ttyS0

    fi

  else

    echo "Update error 3.. $?" > /dev/ttyS0

    echo "Update error, curl error: $?" > /dev/ttyS0

  fi

  sleep 5