From 856150866e7ddff5455ec576a4588fef8d6b8f6c Mon Sep 17 00:00:00 2001
From: Leo Antunes <leo@costela.net>
Date: Wed, 27 Mar 2019 22:48:54 +0100
Subject: [PATCH] avoid downing non-existent iface

---
 wireguard.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wireguard.go b/wireguard.go
index 041ba4a..3ef2b5c 100644
--- a/wireguard.go
+++ b/wireguard.go
@@ -84,6 +84,9 @@ func (wg *wgState) writeConf(nodes []node) error {
 }
 
 func (wg *wgState) downInterface() error {
+	if err := exec.Command("wg", "show", wg.iface).Run(); err != nil {
+		return nil // assume a failure means the interface is not there
+	}
 	return exec.Command("wg-quick", "down", wg.iface).Run()
 }