function check_mysql(){
    // script for checking mysql
    return status
}
mysqlstatus = check_mysql()
while mysqlstatus == false {
    mysqlstatus = check_mysql()
}
// once mysqlstatus == true
// my main script
// my main script
// my main script
// my main script

# Returns true once mysql can connect.
    mysql_ready() {
        mysqladmin ping --host=database --user=root --password=MYSQL_ROOT_PASSWORD > /dev/null 2>&1
    }

    while !(mysql_ready)
    do
       sleep 3
       echo "waiting for mysql ..."
    done

while !(mysqladmin ping)
do
   sleep 3
   echo "waiting for mysql ..."
done
echo "starting the main script"
#main script
#main script
#main script