From 2a99a2a597106cd7347ccb8e5984881419a20efb Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Mon, 19 Oct 2015 13:49:42 +0000
Subject: [PATCH] Don't fail if the arg we're looking for isn't there

---
 weave | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/weave b/weave
index 231a4d33..110bc01d 100755
--- a/weave
+++ b/weave
@@ -1477,8 +1477,8 @@ launch_router() {
 # Recreate the parameter values that are set when the router is first launched
 fetch_router_args() {
     CONTAINER_ARGS=$(docker inspect -f '{{.Args}}' $CONTAINER_NAME)
-    IPRANGE=$(echo $CONTAINER_ARGS | grep -o -e '-ipalloc-range [^ ]*')
-    NO_DNS_OPT=$(echo $CONTAINER_ARGS | grep -o -e '--no-dns')
+    IPRANGE=$(echo $CONTAINER_ARGS | grep -o -e '-ipalloc-range [^ ]*') || true
+    NO_DNS_OPT=$(echo $CONTAINER_ARGS | grep -o -e '--no-dns') || true
 }
 
 attach_router() {