Setup wireguard interface over ssh and return public key

wg-setup

#!/bin/bash

apt-get update &>/dev/null

if [[ "$(lsmod | grep wireguard)" -n ]]; then
    export HAS_WG_MODULE=1
else 
    apt-get install wireguard wireguard-tools -y &>/dev/null
    modprobe wireguard
fi 

if [[ $(which wg &>/dev/null ; echo $?) -eq 0 ]]; then
    export HAS_WG_BIN=1
else 
    apt-get install wireguard-tools -y &>/dev/null
fi 

cd /etc/wireguard
wg genkey | tee private_key | wg pubkey > public_key
chmod 400 private_key public_key

ip link add wg0 type wireguard &>/dev/null
ip addr add $1 dev wg0 &>/dev/null
wg set private-key private_key listen-port $2 allowed-ips $3 &>/dev/null
ip link set up wg0 &>/dev/null
wg showconf wg0 > wg0.conf
chmod 600 wg0.conf

echo "$(cat /etc/wireguard/public_key)"