Make nc time out in a known amount of time instead of hanging

Author: ikatz-drizly

wait-for

@@ -32,7 +32,8 @@ USAGE
 
 wait_for() {
   for i in `seq $TIMEOUT` ; do
-    nc -z "$HOST" "$PORT" > /dev/null 2>&1
+    # use a 1-second timeout, but still sleep 0.1 seconds after just to be safe
+    nc -w 1 -z "$HOST" "$PORT" > /dev/null 2>&1
 
     result=$?
     if [ $result -eq 0 ] ; then
@@ -41,7 +42,7 @@ wait_for() {
       fi
       exit 0
     fi
-    sleep 1
+    sleep 0.1
   done
   echo "Operation timed out" >&2
   if [ $result -ne 0 ] && [ $STRICT -ne 1 ] ; then