nmdc-log-service: add warning message if on TLS verification disabled

src/nmdc-log-service/main.go

@@ -37,7 +37,7 @@ func LogMessage(hub, message string) {
 	// Produce a timestamp
 	timeStamp := instant.Format("2006-01-02 15:04:05")
 
-	fh, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE, 0644)
+	fh, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "Couldn't open file '%s': %s\n", logFilePath, err.Error())
 		return
@@ -112,13 +112,17 @@ func main() {
 	// Assert dir exists
 	dinfo, err := os.Stat(BaseDir)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "FATAL: %s", err.Error())
+		fmt.Fprintf(os.Stderr, "FATAL: %s\n", err.Error())
 		os.Exit(1)
 	}
 	if !dinfo.IsDir() {
 		fmt.Fprintf(os.Stderr, "FATAL: Path '%s' is not a directory\n", BaseDir)
 	}
 
+	if !VerifyTLS {
+		fmt.Fprintf(os.Stderr, "WARNING: TLS certificates will not be verified!\n")
+	}
+
 	// Launch loggers
 	all_hubs := strings.Split(*hubs, ",")
 	launch_ct := 0