Add hostname to defaults if possible

main.go

@@ -31,8 +31,12 @@ type IP struct {
 }
 
 func init() {
+	test, err := os.Hostname()
+	if err == nil {
+		host = test
+	}
 	flag.StringVar(&configFile, "c", "/etc/sssd/sssd.conf", "Path to SSSD Config.")
-	flag.StringVar(&host, "h", host, "Host ID for DNS (relativeDomainName)")
+	flag.StringVar(&host, "h", "", "Host ID for DNS (relativeDomainName)")
 	flag.StringVar(&domain, "d", "", "Domain for DNS (zoneName)")
 	flag.Parse()
 }