#!/bin/bash

if [ "$EUID" -ne 0 ]
  then
  echo "Please run as root"
  exit
fi

# set static ip address
if [[ ! -d /etc/cloud ]]
    then
        read -r -p "Enter Static IP Address with subnet prefix: " staticip
        read -r -p "Enter Gateway IP Address: " gatewayip
        read -r -p "Enter DNS IP Address (separated by commas): " dnsip
        # get adapter name
        name=$(basename /sys/class/net/e*)
        # backup original netplan yaml file
        mv /etc/netplan/00-installer-config.yaml /etc/netplan/00-installer-config.yaml.bak > /dev/null 2>&1
        rm /etc/netplan/01-network-manager-all.yaml > /dev/null 2>&1
        # create new netplan yaml file
        cat >> /etc/netplan/01-network-manager-all.yaml <<HERE
network:
    version: 2
    renderer: networkd
    ethernets:
        $name:
            addresses:
                - $staticip
            nameservers:
                addresses: [$dnsip]
            routes:
                - to: default
                via: $gatewayip
HERE
        # apply netplan
        sudo netplan apply
        echo "Static IP set successfully."
    else
        echo "Static IP not set on cloud image."
fi