feat: added option to write to logfile

main.go

@@ -21,10 +21,20 @@ const INTERVAL = 30 * time.Minute
 
 var backupDir = flag.String("backup-dir", "/srv/backups", "Directory where the backups are located")
 var version_flag = flag.Bool("version", false, "Shows the program version")
+var logfile = flag.String("logfile", "-", "Where to write the logs")
 
 func main() {
 	flag.Parse()
 
+	if *logfile != "-" {
+		f, err := os.OpenFile(*logfile, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0664)
+		if err != nil {
+			log.Fatalf("Could not open logfile: %v\n", err)
+		}
+		defer f.Close()
+		log.SetOutput(f)
+	}
+
 	if *version_flag {
 		fmt.Printf("%v\n", VERSION)
 		os.Exit(0)
@@ -49,8 +59,7 @@ func RecordMetrics(m Metrics) {
 	for {
 		entries, err := os.ReadDir(*backupDir)
 		if err != nil {
-			log.Println(err)
-			os.Exit(1)
+			log.Fatalln(err)
 		}
 
 		for _, entry := range entries {