[ADDED] Print the config file being used in startup banner

server/gateway_test.go

@@ -2501,16 +2501,17 @@ func TestGatewaySendRemoteQSubs(t *testing.T) {
 	// Server sb1 should not have qsub in its sub interest map
 	checkFor(t, time.Second, 15*time.Millisecond, func() error {
 		var entry *sitally
+		var err error
 		sb1.gateway.pasi.Lock()
 		asim := sb1.gateway.pasi.m[globalAccountName]
 		if asim != nil {
 			entry = asim["foo bar"]
 		}
-		sb1.gateway.pasi.Unlock()
 		if entry != nil {
-			return fmt.Errorf("Map should not have an entry, got %#v", entry)
+			err = fmt.Errorf("Map should not have an entry, got %#v", entry)
 		}
-		return nil
+		sb1.gateway.pasi.Unlock()
+		return err
 	})
 
 	// Let's wait for A to receive the unsubscribe

server/server.go

@@ -1244,6 +1244,10 @@ func (s *Server) Start() {
 	// Snapshot server options.
 	opts := s.getOpts()
 
+	if opts.ConfigFile != _EMPTY_ {
+		s.Noticef("Using configuration file: %s", opts.ConfigFile)
+	}
+
 	hasOperators := len(opts.TrustedOperators) > 0
 	if hasOperators {
 		s.Noticef("Trusted Operators")

server/server_test.go

@@ -1747,3 +1747,37 @@ func TestReconnectErrorReports(t *testing.T) {
 		})
 	}
 }
+
+func TestServerLogsConfigurationFile(t *testing.T) {
+	tmpDir, err := ioutil.TempDir("", "_nats-server")
+	if err != nil {
+		t.Fatal("Could not create tmp dir")
+	}
+	defer os.RemoveAll(tmpDir)
+
+	file, err := ioutil.TempFile(tmpDir, "nats_server_log_")
+	if err != nil {
+		t.Fatalf("Could not create the temp file: %v", err)
+	}
+	file.Close()
+
+	conf := createConfFile(t, []byte(fmt.Sprintf(`
+	port: -1
+	logfile: "%s"
+	`, file.Name())))
+	defer os.Remove(conf)
+
+	o := LoadConfig(conf)
+	o.ConfigFile = file.Name()
+	o.NoLog = false
+	s := RunServer(o)
+	s.Shutdown()
+
+	log, err := ioutil.ReadFile(file.Name())
+	if err != nil {
+		t.Fatalf("Error reading log file: %v", err)
+	}
+	if !bytes.Contains(log, []byte(fmt.Sprintf("Using configuration file: %s", file.Name()))) {
+		t.Fatalf("Config file location was not reported in log: %s", log)
+	}
+}