Factor out CIDR arg parsing

weave

@@ -138,6 +138,16 @@ validate_cidr() {
     fi
 }
 
+collect_cidr_args() {
+    CIDR_ARGS=""
+    CIDR_COUNT=0
+    while is_cidr "$1"; do
+        CIDR_ARGS="$CIDR_ARGS $1"
+        CIDR_COUNT=$(($CIDR_COUNT + 1))
+        shift 1
+    done
+}
+
 run_iptables() {
     # -w is recent addition to iptables
     if [ -z "$CHECKED_IPTABLES_W" ] ; then
@@ -660,18 +670,15 @@ case "$COMMAND" in
             DNS_ARGS=$(exec_remote dns-args "$@")
             [ "$1" = "--with-dns" ] && shift 1
         fi
-        CIDRS=""
-        while is_cidr "$1"; do
-            CIDRS="$CIDRS $1"
-            shift 1
-        done
+        collect_cidr_args "$@"
+        shift $CIDR_COUNT
         CONTAINER=$(docker run $DNS_ARGS -d "$@")
         if [ "$LOCAL" = "--local" ]; then
             create_bridge
-            with_container_netns $CONTAINER attach $CIDRS >/dev/null
-            tell_dns PUT $CONTAINER_ID $CIDRS
+            with_container_netns $CONTAINER attach $CIDR_ARGS >/dev/null
+            tell_dns PUT $CONTAINER_ID $CIDR_ARGS
         else
-            exec_remote attach $CIDRS $CONTAINER
+            exec_remote attach $CIDR_ARGS $CONTAINER
         fi
         echo $CONTAINER
         ;;
@@ -681,40 +688,31 @@ case "$COMMAND" in
         ;;
     start)
         [ $# -gt 1 ] || usage
-        CIDRS=""
-        while is_cidr "$1"; do
-            CIDRS="$CIDRS $1"
-            shift 1
-        done
+        collect_cidr_args "$@"
+        shift $CIDR_COUNT
         CONTAINER_ID="$1"
         create_bridge
         CONTAINER=$(docker start $CONTAINER_ID)
-        with_container_netns $CONTAINER_ID attach $CIDRS >/dev/null
-        tell_dns PUT $CONTAINER_ID $CIDRS
+        with_container_netns $CONTAINER_ID attach $CIDR_ARGS >/dev/null
+        tell_dns PUT $CONTAINER_ID $CIDR_ARGS
         echo $CONTAINER
         ;;
     attach)
         [ $# -gt 1 ] || usage
-        CIDRS=""
-        while is_cidr "$1"; do
-            CIDRS="$CIDRS $1"
-            shift 1
-        done
+        collect_cidr_args "$@"
+        shift $CIDR_COUNT
         CONTAINER_ID="$1"
         create_bridge
-        with_container_netns $CONTAINER_ID attach $CIDRS >/dev/null
-        tell_dns PUT $CONTAINER_ID $CIDRS
+        with_container_netns $CONTAINER_ID attach $CIDR_ARGS >/dev/null
+        tell_dns PUT $CONTAINER_ID $CIDR_ARGS
         ;;
     detach)
         [ $# -gt 1 ] || usage
-        CIDRS=""
-        while is_cidr "$1"; do
-            CIDRS="$CIDRS $1"
-            shift 1
-        done
+        collect_cidr_args "$@"
+        shift $CIDR_COUNT
         CONTAINER_ID="$1"
-        with_container_netns $CONTAINER_ID detach $CIDRS >/dev/null
-        tell_dns DELETE $CONTAINER_ID $CIDRS
+        with_container_netns $CONTAINER_ID detach $CIDR_ARGS >/dev/null
+        tell_dns DELETE $CONTAINER_ID $CIDR_ARGS
         ;;
     expose)
         [ $# -eq 1 ] || usage