Implement "crowdsec -fatal" flag; change help message (#2266)

The -trace...-fatal flags do not change the log destination but only the
verbosity. This change reflects that, and implements "-fatal" which was missing.

cmd/crowdsec/main.go

@@ -52,11 +52,14 @@ var (
 
 type Flags struct {
 	ConfigFile     string
-	TraceLevel     bool
-	DebugLevel     bool
-	InfoLevel      bool
-	WarnLevel      bool
-	ErrorLevel     bool
+
+	LogLevelTrace  bool
+	LogLevelDebug  bool
+	LogLevelInfo   bool
+	LogLevelWarn   bool
+	LogLevelError  bool
+	LogLevelFatal  bool
+
 	PrintVersion   bool
 	SingleFileType string
 	Labels         map[string]string
@@ -140,11 +143,14 @@ func (l labelsMap) Set(label string) error {
 
 func (f *Flags) Parse() {
 	flag.StringVar(&f.ConfigFile, "c", csconfig.DefaultConfigPath("config.yaml"), "configuration file")
-	flag.BoolVar(&f.TraceLevel, "trace", false, "VERY verbose")
-	flag.BoolVar(&f.DebugLevel, "debug", false, "print debug-level on stderr")
-	flag.BoolVar(&f.InfoLevel, "info", false, "print info-level on stderr")
-	flag.BoolVar(&f.WarnLevel, "warning", false, "print warning-level on stderr")
-	flag.BoolVar(&f.ErrorLevel, "error", false, "print error-level on stderr")
+
+	flag.BoolVar(&f.LogLevelTrace, "trace", false, "set log level to 'trace' (VERY verbose)")
+	flag.BoolVar(&f.LogLevelDebug, "debug", false, "set log level to 'debug'")
+	flag.BoolVar(&f.LogLevelInfo, "info", false, "set log level to 'info'")
+	flag.BoolVar(&f.LogLevelWarn, "warning", false, "set log level to 'warning'")
+	flag.BoolVar(&f.LogLevelError, "error", false, "set log level to 'error'")
+	flag.BoolVar(&f.LogLevelFatal, "fatal", false, "set log level to 'fatal'")
+
 	flag.BoolVar(&f.PrintVersion, "version", false, "display version")
 	flag.StringVar(&f.OneShotDSN, "dsn", "", "Process a single data source in time-machine")
 	flag.StringVar(&f.Transform, "transform", "", "expr to apply on the event after acquisition")
@@ -172,16 +178,18 @@ func newLogLevel(curLevelPtr *log.Level, f *Flags) *log.Level {
 
 	// override from flags
 	switch {
-	case f.TraceLevel:
+	case f.LogLevelTrace:
 		ret = log.TraceLevel
-	case f.DebugLevel:
+	case f.LogLevelDebug:
 		ret = log.DebugLevel
-	case f.InfoLevel:
+	case f.LogLevelInfo:
 		ret = log.InfoLevel
-	case f.WarnLevel:
+	case f.LogLevelWarn:
 		ret = log.WarnLevel
-	case f.ErrorLevel:
+	case f.LogLevelError:
 		ret = log.ErrorLevel
+	case f.LogLevelFatal:
+		ret = log.FatalLevel
 	default:
 	}