#!/bin/bash
set -e

TMP_FILE="/etc/wireguard/secret/wg0.conf"
WG_FILE="/etc/wireguard/wg0.conf"

function ifup {
    typeset output
    output=$(ip link show "$1" up) && [[ -n $output ]]
}

until [ -f "$TMP_FILE" ]
do
    echo "waiting for wireguard secret to sync" 
    sleep 5
done

cp "$TMP_FILE" "$WG_FILE"

if ifup wg0; then
    echo "wg0 is online"
else
    echo "setting up wg0"
    wg-quick up wg0
fi

while true; do
    sleep 10;

    if diff -q "$TMP_FILE" "$WG_FILE" > /dev/null; then
        continue # no change to config
    fi

    echo "running wireguard sync"
    cp "$TMP_FILE" "$WG_FILE"
    wg-quick strip wg0 > /tmp/wg0-quick.conf && wg syncconf wg0 /tmp/wg0-quick.conf
    rm -f /tmp/wg0-quick.conf
    echo "wireguard sync complete"
done