cdba-server: provide fallbacks for the username value

We use the CDBA_USER value as a way to pass info from cdba-shell to
cdba-server. However if it is not provide (e.g. because the cdba-server
is started directly by shell) add a fallback to the system's USER
variable. And if that's also not set, provide a safe default of
'nobody'.

Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: lumag

cdba-server.c

@@ -356,6 +356,10 @@ int main(int argc, char **argv)
 	signal(SIGPIPE, sigpipe_handler);
 
 	username = getenv("CDBA_USER");
+	if (!username)
+		username = getenv("USER");
+	if (!username)
+		username = "nobody";
 
 	ret = device_parser(".cdba");
 	if (ret) {