From 09abbdfcf07f2e4e021bc47bf4f3f767ff17a219 Mon Sep 17 00:00:00 2001
From: Arminas <armisss4@gmail.com>
Date: Fri, 10 Feb 2023 15:23:15 +0200
Subject: [PATCH] Created restart-wg.sh file

Created wireguard restart script, which compares wg0.conf part between [Interface] and first peer with previous version for changes, and, if there is any - restarts whole wireguard, if the only changes are done to peers, it calls "wg syncconf", eliminating client disconnection after pressing apply config problem.
---
 restart-wg.sh | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 restart-wg.sh

diff --git a/restart-wg.sh b/restart-wg.sh
new file mode 100644
index 0000000..dbbe864
--- /dev/null
+++ b/restart-wg.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+config="/etc/wireguard/wg0.conf"
+old_config="/etc/wireguard/wg0.conf.old"
+
+if [ ! -f $old_config ]; then
+    awk '/Interface/,/# ID:/' $config | head -n -1 | tail -n +2 > $old_config
+    echo "No old config found, restarting wireguard (wg-quick)"
+    wg-quick down wg0
+    systemctl restart wg-quick@wg0.service
+    exit 0
+fi
+
+difference=$(diff <(awk '/Interface/,/# ID:/' $config | head -n -1 | tail -n +2) <(cat $old_config))
+
+if [ -n "$difference" ]; then
+    awk '/Interface/,/# ID:/' $config | head -n -1 | tail -n +2 > $old_config
+    echo "Changes to interface detected, restarting wireguard (wg-quick)"
+    wg-quick down wg0
+    systemctl restart wg-quick@wg0.service
+    exit 0
+else
+    awk '/Interface/,/# ID:/' $config | head -n -1 | tail -n +2 > $old_config
+    echo "No changes to interface detected, restarting wireguard (wg syncconf)"
+    wg syncconf wg0 <(wg-quick strip wg0)
+    exit 0
+fi