wait_for_dependencies

gistfile1.txt

#!/bin/sh

SERVICES=$(echo "$DEPENDENCIES" | tr "|" "\n")

resolve()
{
    for SERVICE in $SERVICES; do

        ip=$(nslookup "$SERVICE" | awk '/^Address: / { print $2 }')

        if echo "$ip" | grep -Eq "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b"; then
            echo "$SERVICE ===> $ip"
          else
            echo "can not revolve $SERVICE --XX--"
            sleep 0.1
            resolve
        fi

    done
}

resolve

exec "$@"