From 7d81ceb898e374f37c95b01ddd5c4f6f1203502f Mon Sep 17 00:00:00 2001
From: Maximilian Wilhelm <max@sdn.clinic>
Date: Sun, 30 Aug 2020 22:38:38 +0200
Subject: [PATCH] link executor: Only create dummy interface when not present.

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>
---
 executor-scripts/linux/link | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/executor-scripts/linux/link b/executor-scripts/linux/link
index 4d21381..e50b928 100755
--- a/executor-scripts/linux/link
+++ b/executor-scripts/linux/link
@@ -34,6 +34,13 @@ is_vlan() {
 case "$PHASE" in
 pre-up)
 	if [ "${IF_LINK_TYPE}" = "dummy" ]; then
+		if [ -d "/sys/class/net/${IFACE}" ]; then
+			iface_type=$(ip -d link show dev "${IFACE}" | head -n3 | tail -n1 | awk '{ print $1 }')
+			if [ "${iface_type}" = 'dummy' ]; then
+				exit 0
+			fi
+		fi
+
 		ip link add "${IFACE}" type dummy
 	fi
 	;;