-system("certtool --generate-privkey --outfile key.pem");
-system("certtool --generate-self-signed --load-privkey key.pem --outfile cert.pem --template certtool.template");
+if ( (my $status = system("certtool --generate-privkey --outfile key.pem")) ne 0) { return 1; }
+if ( (my $status = system("certtool --generate-self-signed --load-privkey key.pem --outfile cert.pem --template certtool.template")) ne 0) { return 1; }