Use logger.Interface when resolving auto mode

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-container-runtime-hook/main.go

@@ -14,6 +14,7 @@ import (
 	"syscall"
 
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/info"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
 )
 
@@ -188,11 +189,11 @@ func main() {
 	}
 }
 
-// logInterceptor implements the info.Logger interface to allow for logging from this function.
+// logInterceptor implements the logger.Interface to allow for logging from executable.
-type logInterceptor struct{}
+type logInterceptor struct {
+	logger.NullLogger
+}
 
 func (l *logInterceptor) Infof(format string, args ...interface{}) {
 	log.Printf(format, args...)
 }
-
-func (l *logInterceptor) Debugf(format string, args ...interface{}) {}

internal/info/auto.go

@@ -16,17 +16,13 @@
 
 package info
 
-import "gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvlib/info"
+import (
-
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
-// Logger is a basic interface for logging to allow these functions to be called
+	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvlib/info"
-// from code where logrus is not used.
+)
-type Logger interface {
-	Infof(string, ...interface{})
-	Debugf(string, ...interface{})
-}
 
 // ResolveAutoMode determines the correct mode for the platform if set to "auto"
-func ResolveAutoMode(logger Logger, mode string) (rmode string) {
+func ResolveAutoMode(logger logger.Interface, mode string) (rmode string) {
 	if mode != "auto" {
 		return mode
 	}

internal/logger/lib.go

@@ -22,3 +22,29 @@ import "github.com/sirupsen/logrus"
 func New() Interface {
 	return logrus.StandardLogger()
 }
+
+// NullLogger is a logger that does nothing
+type NullLogger struct{}
+
+var _ Interface = (*NullLogger)(nil)
+
+// Debugf is a no-op for the null logger
+func (l *NullLogger) Debugf(string, ...interface{}) {}
+
+// Errorf is a no-op for the null logger
+func (l *NullLogger) Errorf(string, ...interface{}) {}
+
+// Info is a no-op for the null logger
+func (l *NullLogger) Info(...interface{}) {}
+
+// Infof is a no-op for the null logger
+func (l *NullLogger) Infof(string, ...interface{}) {}
+
+// Warn is a no-op for the null logger
+func (l *NullLogger) Warn(...interface{}) {}
+
+// Warnf is a no-op for the null logger
+func (l *NullLogger) Warnf(string, ...interface{}) {}
+
+// Warningf is a no-op for the null logger
+func (l *NullLogger) Warningf(string, ...interface{}) {}