backward compatibility

weave

@@ -264,6 +264,12 @@ case "$COMMAND" in
         # (eth0, wlan0, etc) so the name becomes stable across host
         # restarts.
         MACADDR=`cat /sys/class/net/$BRIDGE/address`
+        # Backward compatibility... Note that the regexp here is far
+        # from precise, but good enough.
+        if echo "$1" | grep -E '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}/[0-9]{1,2}$' >/dev/null ; then
+            echo "WARNING: $1 parameter swallowed; 'weave launch' no longer takes a CIDR as the first parameter" >&2
+            shift 1
+        fi
         # Set WEAVE_DOCKER_ARGS in the environment in order to supply
         # additional parameters, such as resource limits, to docker
         # when launching the weave container.