Improve robustness

weaver/weave

@@ -60,7 +60,7 @@ create_bridge() {
         ip link del dev v${CONTAINER_IFNAME}du
         # disable offloading
         check_command_and_run ethtool ethtool -K $BRIDGE tx off >/dev/null
-        # Work round the situation where there are no rules allowing traffic
+        # Work around the situation where there are no rules allowing traffic
         # across our bridge. E.g. ufw
         add_iptables_rule filter FORWARD -i weave -o weave -j ACCEPT
     }
@@ -71,7 +71,7 @@ destroy_bridge() {
     if [ -d /sys/class/net/$BRIDGE ] ; then
         ip link del dev $BRIDGE
     fi
-    iptables -t filter -D FORWARD -i weave -o weave -j ACCEPT 2>/dev/null || true
+    run_iptables -t filter -D FORWARD -i weave -o weave -j ACCEPT 2>/dev/null || true
 }
 
 run_iptables() {
@@ -97,7 +97,7 @@ add_iptables_rule() {
 }
 
 add_nat_rule() {
-    add_iptables_rule nat $@
+    add_iptables_rule nat "$@"
 }
 
 setup_masquerading() {