From dced4e3d6fea501dde1ff73e1a995106e571df48 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bryan@Bryans-MacBook-Air.local>
Date: Thu, 28 Aug 2014 17:20:17 +0100
Subject: [PATCH] add a test to see whether ethtool is available before trying
 to run it

---
 weaver/weave | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/weaver/weave b/weaver/weave
index 2e97b726..92939eb1 100755
--- a/weaver/weave
+++ b/weaver/weave
@@ -87,7 +87,12 @@ ip netns exec $NSPID ip link set $GUEST_IFNAME name $CONTAINER_IFNAME
 ip netns exec $NSPID ip addr add $IPADDR dev $CONTAINER_IFNAME
 ip netns exec $NSPID ip link set $CONTAINER_IFNAME up
 
-ip netns exec $NSPID ethtool -K $IFACE tx off > /dev/null
+if [ command -v ethtool >/dev/null 2>&1 ]
+then
+    ip netns exec $NSPID ethtool -K $IFACE tx off > /dev/null
+else
+    echo "Unable to run ethtool command; continuing without it" >&2
+fi
 
 [ -f /var/run/netns/$NSPID ] && rm -f /var/run/netns/$NSPID