Added 'weave version' command per Issue #56

weaver/weave

@@ -8,6 +8,7 @@ usage() {
     echo "weave expose <ipaddr>/<subnet>"
     echo "weave hide   <ipaddr>/<subnet>"
     echo "weave status"
+    echo "weave version"
     echo "weave stop"
     exit 1
 }
@@ -122,6 +123,17 @@ case "$COMMAND" in
         fi
         exit 0
         ;;
+    version)
+		# Try the running container first; if no luck try the image
+        if ! DOCKERIMAGE=$(docker inspect --format='{{ .Image }}' weave 2>/dev/null) ; then
+            if ! DOCKERIMAGE=$(docker inspect --format='{{ .Id }}' zettio/weave 2>/dev/null) ; then
+                echo "Unable to find zettio/weave image." >&2
+                exit 1
+            fi
+        fi
+        docker images --no-trunc | grep $DOCKERIMAGE | grep -v latest | tr -s ' ' | cut -d ' ' -f 2
+        exit 0
+        ;;
     run)
         [ $# -gt 0 ] || usage
         IPADDR=$1