introduce 'weave hide'

README.md

@@ -198,7 +198,8 @@ application containers. On $HOST2 we run
 
     host2# weave expose 10.0.1.102/24
 
-choosing an unused IP address in the application subnet.
+choosing an unused IP address in the application subnet. (There is a
+corresponding 'hide' command to revert this step.)
 
 Now
 

weaver/weave

@@ -6,6 +6,7 @@ usage() {
     echo "weave launch <ipaddr>/<subnet> [-passwd <passwd>] <peer_host> ..."
     echo "weave run    <ipaddr>/<subnet> <docker run args> ..."
     echo "weave expose <ipaddr>/<subnet>"
+    echo "weave hide   <ipaddr>/<subnet>"
     echo "weave stop"
     exit 1
 }
@@ -89,6 +90,16 @@ case "$COMMAND" in
         fi
         exit 0
         ;;
+    hide)
+        [ $# -gt 0 ] || usage
+        IPADDR=$1
+        shift 1
+        if ip addr list dev $BRIDGE | grep -qF $IPADDR
+        then
+            ip addr del dev $BRIDGE $IPADDR
+        fi
+        exit 0
+        ;;
     stop)
         docker kill weave > /dev/null
         docker rm weave > /dev/null