Guard chmod at the end.

diff --git a/configs/keygen.sh b/configs/keygen.sh
index 0729fe3..5ae60db 100755 (executable)
--- a/configs/keygen.sh
+++ b/configs/keygen.sh
@@ -66,5 +66,8 @@ else
     openssl req -config sp-cert.cnf -new -x509 -days $DAYS -keyout sp-key.pem -out sp-cert.pem 2> /dev/null
 fi
 
-chmod 600 sp-key.pem
 rm sp-cert.cnf
+
+if  [ -s sp-key.pem ] ; then
+    chmod 600 sp-key.pem
+fi