Add nvidia-container-runtime.runtimes config option

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

cmd/nvidia-container-runtime/main_test.go

@@ -24,6 +24,10 @@ const (
 	unmodifiedSpecFileSuffix = "test/input/test_spec.json"
 )
 
+const (
+	runcExecutableName = "runc"
+)
+
 type testConfig struct {
 	root    string
 	binPath string

cmd/nvidia-container-runtime/runtime_factory.go

@@ -26,15 +26,9 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-const (
-	dockerRuncExecutableName = "docker-runc"
-	runcExecutableName       = "runc"
-)
-
 // newNVIDIAContainerRuntime is a factory method that constructs a runtime based on the selected configuration and specified logger
 func newNVIDIAContainerRuntime(logger *logrus.Logger, cfg *config.Config, argv []string) (oci.Runtime, error) {
-	lowLevelRuntimeCandidates := []string{dockerRuncExecutableName, runcExecutableName}
-	lowLevelRuntime, err := oci.NewLowLevelRuntime(logger, lowLevelRuntimeCandidates)
+	lowLevelRuntime, err := oci.NewLowLevelRuntime(logger, cfg.NVIDIAContainerRuntimeConfig.Runtimes)
 	if err != nil {
 		return nil, fmt.Errorf("error constructing low-level runtime: %v", err)
 	}

cmd/nvidia-container-runtime/runtime_factory_test.go

@@ -38,10 +38,19 @@ func TestFactoryMethod(t *testing.T) {
 		expectedError bool
 	}{
 		{
-			description: "empty config no error",
+			description: "empty config raises error",
 			cfg: &config.Config{
 				NVIDIAContainerRuntimeConfig: config.RuntimeConfig{},
 			},
+			expectedError: true,
+		},
+		{
+			description: "config with runtime raises no error",
+			cfg: &config.Config{
+				NVIDIAContainerRuntimeConfig: config.RuntimeConfig{
+					Runtimes: []string{"runc"},
+				},
+			},
 		},
 		{
 			description: "experimental flag supported",
@@ -49,6 +58,7 @@ func TestFactoryMethod(t *testing.T) {
 				NVIDIAContainerRuntimeConfig: config.RuntimeConfig{
 					Experimental: true,
 					DiscoverMode: "legacy",
+					Runtimes:     []string{"runc"},
 				},
 			},
 			spec: &specs.Spec{