Merge pull request #57 from bboreham/56_display_version

Added 'weave version' command

Fixes #56

README.md

@@ -349,6 +349,15 @@ quickly enough.
 
 ## Troubleshooting
 
+Check what version of weave you are running: 
+
+    weave version
+
+and compare against https://registry.hub.docker.com/u/zettio/weave/tags/manage/.
+If you don't have the latest released version you can download it with:
+
+    docker pull zettio/weave
+
 Check the weave container logs with
 
     docker logs weave

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"
     echo "weave reset"
     exit 1
@@ -185,6 +186,16 @@ case "$COMMAND" in
             exit 1
         fi
         ;;
+    version)
+        # Try the running container first; if no luck try the image
+        if ! DOCKERIMAGE=$(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
+        ;;
     run)
         [ $# -gt 0 ] || usage
         IPADDR=$1