Use nvcdi.spec package to write and validate spec

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

cmd/nvidia-ctk/cdi/generate/generate.go

@@ -18,7 +18,6 @@ package generate
 
 import (
 	"fmt"
-	"io"
 	"os"
 	"path/filepath"
 	"strings"
@@ -26,13 +25,13 @@ import (
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/discover"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/edits"
 	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi"
+	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/spec"
 	"github.com/container-orchestrated-devices/container-device-interface/pkg/cdi"
 	specs "github.com/container-orchestrated-devices/container-device-interface/specs-go"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvlib/device"
 	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvml"
-	"sigs.k8s.io/yaml"
 )
 
 const (
@@ -118,7 +117,8 @@ func (m command) build() *cli.Command {
 	return &c
 }
 
-func (m command) validateFlags(r *cli.Context, cfg *config) error {
+func (m command) validateFlags(c *cli.Context, cfg *config) error {
+
 	cfg.format = strings.ToLower(cfg.format)
 	switch cfg.format {
 	case formatJSON:
@@ -143,31 +143,6 @@ func (m command) validateFlags(r *cli.Context, cfg *config) error {
 
 	cfg.nvidiaCTKPath = discover.FindNvidiaCTK(m.logger, cfg.nvidiaCTKPath)
 
-	return nil
-}
-
-func (m command) run(c *cli.Context, cfg *config) error {
-	spec, err := m.generateSpec(cfg)
-	if err != nil {
-		return fmt.Errorf("failed to generate CDI spec: %v", err)
-	}
-
-	var outputTo io.Writer
-	if cfg.output == "" {
-		outputTo = os.Stdout
-	} else {
-		err := createParentDirsIfRequired(cfg.output)
-		if err != nil {
-			return fmt.Errorf("failed to create parent folders for output file: %v", err)
-		}
-		outputFile, err := os.Create(cfg.output)
-		if err != nil {
-			return fmt.Errorf("failed to create output file: %v", err)
-		}
-		defer outputFile.Close()
-		outputTo = outputFile
-	}
-
 	if outputFileFormat := formatFromFilename(cfg.output); outputFileFormat != "" {
 		m.logger.Debugf("Inferred output format as %q from output file name", outputFileFormat)
 		if !c.IsSet("format") {
@@ -177,25 +152,29 @@ func (m command) run(c *cli.Context, cfg *config) error {
 		}
 	}
 
-	data, err := yaml.Marshal(spec)
+	return nil
-	if err != nil {
+}
-		return fmt.Errorf("failed to marshal CDI spec: %v", err)
-	}
 
-	if strings.ToLower(cfg.format) == formatJSON {
+func (m command) run(c *cli.Context, cfg *config) error {
-		data, err = yaml.YAMLToJSONStrict(data)
+	spec, err := m.generateSpec(cfg)
 	if err != nil {
-			return fmt.Errorf("failed to convert CDI spec from YAML to JSON: %v", err)
+		return fmt.Errorf("failed to generate CDI spec: %v", err)
+	}
+	m.logger.Infof("Generated CDI spec with version", spec.Raw().Version)
+
+	if cfg.output == "" {
+		_, err := spec.WriteTo(os.Stdout)
+		if err != nil {
+			return fmt.Errorf("failed to write CDI spec to STDOUT: %v", err)
 		}
 		return nil
 	}
 
-	err = writeToOutput(cfg.format, data, outputTo)
+	err = createParentDirsIfRequired(cfg.output)
 	if err != nil {
-		return fmt.Errorf("failed to write output: %v", err)
+		return fmt.Errorf("failed to create parent folders for output file: %v", err)
 	}
-
+	return spec.Save(cfg.output)
-	return nil
 }
 
 func formatFromFilename(filename string) string {
@@ -212,22 +191,7 @@ func formatFromFilename(filename string) string {
 	return ""
 }
 
-func writeToOutput(format string, data []byte, output io.Writer) error {
+func (m command) generateSpec(cfg *config) (spec.Interface, error) {
-	if format == formatYAML {
-		_, err := output.Write([]byte("---\n"))
-		if err != nil {
-			return fmt.Errorf("failed to write YAML separator: %v", err)
-		}
-	}
-	_, err := output.Write(data)
-	if err != nil {
-		return fmt.Errorf("failed to write data: %v", err)
-	}
-
-	return nil
-}
-
-func (m command) generateSpec(cfg *config) (*specs.Spec, error) {
 	deviceNamer, err := nvcdi.NewDeviceNamer(cfg.deviceNameStrategy)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create device namer: %v", err)
@@ -275,23 +239,13 @@ func (m command) generateSpec(cfg *config) (*specs.Spec, error) {
 		return nil, fmt.Errorf("failed to create edits common for entities: %v", err)
 	}
 
-	// We construct the spec and determine the minimum required version based on the specification.
+	return spec.New(
-	spec := specs.Spec{
+		spec.WithVendor("nvidia.com"),
-		Version:        "NOT_SET",
+		spec.WithClass("gpu"),
-		Kind:           "nvidia.com/gpu",
+		spec.WithDeviceSpecs(deviceSpecs),
-		Devices:        deviceSpecs,
+		spec.WithEdits(*commonEdits.ContainerEdits),
-		ContainerEdits: *commonEdits.ContainerEdits,
+		spec.WithFormat(cfg.format),
-	}
+	)
-
-	minVersion, err := cdi.MinimumRequiredVersion(&spec)
-	if err != nil {
-		return nil, fmt.Errorf("failed to get minumum required CDI spec version: %v", err)
-	}
-	m.logger.Infof("Using minimum required CDI spec version: %s", minVersion)
-
-	spec.Version = minVersion
-
-	return &spec, nil
 }
 
 // MergeDeviceSpecs creates a device with the specified name which combines the edits from the previous devices.