Fix zap levels to align with logr

Author: bharathi-tenneti

pkg/log/zap/flags.go

@@ -34,6 +34,12 @@ var levelStrings = map[string]zapcore.Level{
 	"error": zap.ErrorLevel,
 }
 
+var stackLevelStrings = map[string]zapcore.Level{
+	"disabled": zap.FatalLevel,
+	"info":     zap.InfoLevel,
+	"error":    zap.ErrorLevel,
+}
+
 type encoderFlag struct {
 	setFunc func(zapcore.Encoder)
 	value   string
@@ -87,7 +93,7 @@ func (ev *levelFlag) Set(flagValue string) error {
 		if err != nil {
 			return fmt.Errorf("invalid log level \"%s\"", flagValue)
 		}
-		if logLevel > 0 {
+		if logLevel >= 0 {
 			intLevel := -1 * logLevel
 			ev.setFunc(zap.NewAtomicLevelAt(zapcore.Level(int8(intLevel))))
 		} else {
@@ -116,7 +122,7 @@ type stackTraceFlag struct {
 var _ pflag.Value = &stackTraceFlag{}
 
 func (ev *stackTraceFlag) Set(flagValue string) error {
-	level, validLevel := levelStrings[strings.ToLower(flagValue)]
+	level, validLevel := stackLevelStrings[strings.ToLower(flagValue)]
 	if !validLevel {
 		return fmt.Errorf("invalid stacktrace level \"%s\"", flagValue)
 	}