From 2d8318b1584b84a7148367f46c59ee6dc55d79a5 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Tue, 23 Sep 2014 13:53:20 +0100
Subject: [PATCH] Improved test for blank string

---
 weaver/weave | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/weaver/weave b/weaver/weave
index 80d220c1..d7a617ed 100755
--- a/weaver/weave
+++ b/weaver/weave
@@ -187,7 +187,7 @@ detach() {
     EXITCODE=1
     if ip netns exec $NSPID ip addr del $2 dev $CONTAINER_IFNAME ; then
         # if no inet addresses remain then delete the veth
-        if [ $(ip netns exec $NSPID ip -f inet addr show dev ethwe | wc -c) -eq 0 ] ; then
+        if [ -z "$(ip netns exec $NSPID ip -f inet addr list dev ethwe)" ] ; then
             if ip link del $LOCAL_IFNAME type veth ; then
                 EXITCODE=0
             else