log info when plugin is disabled

client/devicemanager/instance.go

@@ -336,7 +336,11 @@ START:
 
 	// Start fingerprinting
 	fingerprintCh, err := devicePlugin.Fingerprint(i.ctx)
-	if err != nil {
+	if err == device.ErrPluginDisabled {
+		i.logger.Info("fingerprinting failed: plugin is not enabled")
+		i.handleFingerprintError()
+		return
+	} else if err != nil {
 		i.logger.Error("fingerprinting failed", "error", err)
 		i.handleFingerprintError()
 		return

devices/gpu/nvidia/device.go

@@ -70,8 +70,6 @@ var (
 			hclspec.NewLiteral("\"1m\""),
 		),
 	})
-
-	errDeviceNotEnabled = fmt.Errorf("Nvidia device is not enabled")
 )
 
 // Config contains configuration information for the plugin.
@@ -160,7 +158,7 @@ func (d *NvidiaDevice) SetConfig(cfg *base.Config) error {
 // devices health changes, messages will be emitted.
 func (d *NvidiaDevice) Fingerprint(ctx context.Context) (<-chan *device.FingerprintResponse, error) {
 	if !d.enabled {
-		return nil, errDeviceNotEnabled
+		return nil, device.ErrPluginDisabled
 	}
 
 	outCh := make(chan *device.FingerprintResponse)
@@ -184,7 +182,7 @@ func (d *NvidiaDevice) Reserve(deviceIDs []string) (*device.ContainerReservation
 		return &device.ContainerReservation{}, nil
 	}
 	if !d.enabled {
-		return nil, errDeviceNotEnabled
+		return nil, device.ErrPluginDisabled
 	}
 
 	// Due to the asynchronous nature of NvidiaPlugin, there is a possibility
@@ -221,7 +219,7 @@ func (d *NvidiaDevice) Reserve(deviceIDs []string) (*device.ContainerReservation
 // Stats streams statistics for the detected devices.
 func (d *NvidiaDevice) Stats(ctx context.Context, interval time.Duration) (<-chan *device.StatsResponse, error) {
 	if !d.enabled {
-		return nil, errDeviceNotEnabled
+		return nil, device.ErrPluginDisabled
 	}
 
 	outCh := make(chan *device.StatsResponse)

plugins/device/device.go

@@ -15,6 +15,11 @@ const (
 	DeviceTypeGPU = "gpu"
 )
 
+var (
+	// ErrPluginDisabled indicates that the device plugin is disabled
+	ErrPluginDisabled = fmt.Errorf("device is not enabled")
+)
+
 // DevicePlugin is the interface for a plugin that can expose detected devices
 // to Nomad and inform it how to mount them.
 type DevicePlugin interface {