From 51afd5e9c6f1b357729d227034d322b539ed0b54 Mon Sep 17 00:00:00 2001
From: Matthias Radestock <matthias.radestock@gmail.com>
Date: Thu, 11 Sep 2014 07:56:26 +0100
Subject: [PATCH] make 'weave launch' cope gracefully with existing 'weave'
 containers Fixed #31

---
 weaver/weave | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/weaver/weave b/weaver/weave
index 76fb260d..5dab5d9b 100755
--- a/weaver/weave
+++ b/weaver/weave
@@ -82,6 +82,23 @@ case "$COMMAND" in
         # (eth0, wlan0, etc) so the name becomes stable across host
         # restarts.
         MACADDR=`cat /sys/class/net/$BRIDGE/address`
+        case $(docker inspect --format '{{ .State.Running }} {{ .Config.Image }}' weave 2>/dev/null) in
+            "true zettio/weave")
+                echo "Weave is already running." >&2
+                exit 1
+                ;;
+            "false zettio/weave")
+                docker rm weave >/dev/null
+                ;;
+            true*)
+                echo "Found another running container named 'weave'. Aborting." >&2
+                exit 1
+                ;;
+            false*)
+                echo "Found another container named 'weave'. Aborting." >&2
+                exit 1
+                ;;
+        esac
         CONTAINER=$(docker run --privileged -d --name=weave -p 6783:6783/tcp -p 6783:6783/udp $WEAVE_DOCKER_ARGS zettio/weave -name $MACADDR "$@")
         echo $CONTAINER
         IFACE=eth0