#  Version 1.0:
#  Created 2024 by Tim Eertmoed, Christian Hampp @ WiS IT-Solutions GmbH, Germany to work on Raspian as custom pxe init script.

#!/bin/bash
watchdog=$(sudo cat /var/lib/dhcp/* | grep -a "option watchdog" | tail -1 | \
awk '{for (i=3; i<=NF; i++) printf "%s ", $i}' | tr -d '";')
IFS=' ' read -r -a ip_array <<< "$watchdog"
config_file="/etc/watchdog.conf"
sudo cp "$config_file" "$config_file.bak"
sudo sed -i '/ping/d' "$config_file"
sudo sed -i '/^interval/d' "$config_file"
echo "interval = 60" | sudo tee -a "$config_file" > /dev/null
if [ ${#ip_array[@]} -eq 0 ]; then
    sudo sed -i '/interval/d' "$config_file"
    echo "No IP addresses found. Watchdog configuration cleared." >&2
    sudo systemctl stop watchdog
else
    for ip in "${ip_array[@]}"; do
        echo "ping = $ip" | sudo tee -a "$config_file" > /dev/null
    done
fi
sudo systemctl restart watchdog