Fix bug when using just-in-time CDI spec generation

This change fixes a bug when using just-in-time CDI spec generation for the
NVIDIA Container Runtime for specific devices (i.e. not 'all').
Instead of unconditionally using the default nvsandboxutils library -- leading
to errors due to undefined symbols -- we check whether the library can be
properly initialised before continuing.

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

Author: elezar

pkg/nvcdi/lib-nvml.go

@@ -103,7 +103,7 @@ func (l *nvmllib) GetDeviceSpecsByID(ids ...string) ([]specs.Device, error) {
 	return l.GetDeviceSpecsBy(identifiers...)
 }
 
-// GetDeviceSpecsBy is not supported for the gdslib specs.
+// GetDeviceSpecsBy returns the device specs for devices with the specified identifiers.
 func (l *nvmllib) GetDeviceSpecsBy(identifiers ...device.Identifier) ([]specs.Device, error) {
 	for _, id := range identifiers {
 		if id == "all" {
@@ -118,10 +118,23 @@ func (l *nvmllib) GetDeviceSpecsBy(identifiers ...device.Identifier) ([]specs.De
 	}
 	defer func() {
 		if r := l.nvmllib.Shutdown(); r != nvml.SUCCESS {
-			l.logger.Warningf("failed to shutdown NVML: %w", r)
+			l.logger.Warningf("failed to shutdown NVML: %v", r)
 		}
 	}()
 
+	if l.nvsandboxutilslib != nil {
+		if r := l.nvsandboxutilslib.Init(l.driverRoot); r != nvsandboxutils.SUCCESS {
+			l.logger.Warningf("Failed to init nvsandboxutils: %v; ignoring", r)
+			l.nvsandboxutilslib = nil
+		}
+		defer func() {
+			if l.nvsandboxutilslib == nil {
+				return
+			}
+			_ = l.nvsandboxutilslib.Shutdown()
+		}()
+	}
+
 	nvmlDevices, err := l.getNVMLDevicesByID(identifiers...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get NVML device handles: %w", err)