Check for updates

  # TODO: Auto-update agent

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

  rm -f /tmp/agent.sh

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

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

      fi

    fi

  fi

  sleep 5

fi