func gracefulShutdown(etcdDataSource datasource.DataSource) {
err := etcdDataSource.Shutdown()
if err != nil {
fmt.Fprintf(os.Stderr, "\nError while removing the instance: %s\n", err)
} else {
fmt.Fprint(os.Stderr, "\nBlacksmith is gracefully shutdown\n")
}
os.Exit(0)
}
