From 3c4b0b3a4b2f22824db7870ac812d12e63471810 Mon Sep 17 00:00:00 2001
From: braginini <bangvalo@gmail.com>
Date: Thu, 26 Aug 2021 18:04:19 +0200
Subject: [PATCH] fix: remove existing wiretrustee interface if existed

---
 iface/iface_linux.go | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/iface/iface_linux.go b/iface/iface_linux.go
index 2cb3af72f..f2c0300e3 100644
--- a/iface/iface_linux.go
+++ b/iface/iface_linux.go
@@ -30,8 +30,27 @@ func CreateWithKernel(iface string, address string) error {
 		attrs: &attrs,
 	}
 
+	// check if interface exists
+	l, err := netlink.LinkByName(WgInterfaceDefault)
+	if err != nil {
+		switch err.(type) {
+		case netlink.LinkNotFoundError:
+			break
+		default:
+			return err
+		}
+	}
+
+	// remove if interface exists
+	if l != nil {
+		err = netlink.LinkDel(&link)
+		if err != nil {
+			return err
+		}
+	}
+
 	log.Debugf("adding device: %s", iface)
-	err := netlink.LinkAdd(&link)
+	err = netlink.LinkAdd(&link)
 	if os.IsExist(err) {
 		log.Infof("interface %s already exists. Will reuse.", iface)
 	} else if err != nil {