Set minimum version on save

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

pkg/nvcdi/spec/api.go

@@ -24,6 +24,8 @@ import (
 
 const (
 	// DetectMinimumVersion is a constant that triggers a spec to detect the minimum required version.
+	//
+	// Deprecated: DetectMinimumVersion is deprecated and will be removed.
 	DetectMinimumVersion = "DETECT_MINIMUM_VERSION"
 
 	// FormatJSON indicates a JSON output format

pkg/nvcdi/spec/builder.go

@@ -39,6 +39,8 @@ type builder struct {
 	mergedDeviceOptions []transform.MergedDeviceOption
 	noSimplify          bool
 	permissions         os.FileMode
+
+	transformOnSave transform.Transformer
 }
 
 // newBuilder creates a new spec builder with the supplied options
@@ -47,15 +49,23 @@ func newBuilder(opts ...Option) *builder {
 	for _, opt := range opts {
 		opt(s)
 	}
+
 	if s.raw != nil {
 		s.noSimplify = true
 		vendor, class := parser.ParseQualifier(s.raw.Kind)
+		if s.vendor == "" {
 			s.vendor = vendor
+		}
+		if s.class == "" {
 			s.class = class
 		}
-
+		if s.version == "" || s.version == DetectMinimumVersion {
-	if s.version == "" {
+			s.version = s.raw.Version
-		s.version = DetectMinimumVersion
+		}
+	}
+	if s.version == "" || s.version == DetectMinimumVersion {
+		s.transformOnSave = &setMinimumRequiredVersion{}
+		s.version = cdi.CurrentVersion
 	}
 	if s.vendor == "" {
 		s.vendor = "nvidia.com"
@@ -83,13 +93,8 @@ func (o *builder) Build() (*spec, error) {
 			ContainerEdits: o.edits,
 		}
 	}
-
+	if raw.Version == "" {
-	if raw.Version == DetectMinimumVersion {
+		raw.Version = o.version
-		minVersion, err := cdi.MinimumRequiredVersion(raw)
-		if err != nil {
-			return nil, fmt.Errorf("failed to get minimum required CDI spec version: %v", err)
-		}
-		raw.Version = minVersion
 	}
 
 	if !o.noSimplify {
@@ -113,8 +118,8 @@ func (o *builder) Build() (*spec, error) {
 		Spec:            raw,
 		format:          o.format,
 		permissions:     o.permissions,
+		transformOnSave: o.transformOnSave,
 	}
-
 	return &s, nil
 }
 

pkg/nvcdi/spec/set-minimum-version.go

@@ -0,0 +1,35 @@
+/**
+# Copyright 2024 NVIDIA CORPORATION
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package spec
+
+import (
+	"fmt"
+
+	"tags.cncf.io/container-device-interface/pkg/cdi"
+	"tags.cncf.io/container-device-interface/specs-go"
+)
+
+type setMinimumRequiredVersion struct{}
+
+func (d setMinimumRequiredVersion) Transform(spec *specs.Spec) error {
+	minVersion, err := cdi.MinimumRequiredVersion(spec)
+	if err != nil {
+		return fmt.Errorf("failed to get minimum required CDI spec version: %v", err)
+	}
+	spec.Version = minVersion
+	return nil
+}

pkg/nvcdi/spec/spec.go

@@ -24,12 +24,15 @@ import (
 
 	"tags.cncf.io/container-device-interface/pkg/cdi"
 	"tags.cncf.io/container-device-interface/specs-go"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/transform"
 )
 
 type spec struct {
 	*specs.Spec
 	format          string
 	permissions     os.FileMode
+	transformOnSave transform.Transformer
 }
 
 var _ Interface = (*spec)(nil)
@@ -41,6 +44,12 @@ func New(opts ...Option) (Interface, error) {
 
 // Save writes the spec to the specified path and overwrites the file if it exists.
 func (s *spec) Save(path string) error {
+	if s.transformOnSave != nil {
+		err := s.transformOnSave.Transform(s.Raw())
+		if err != nil {
+			return fmt.Errorf("error applying transform: %w", err)
+		}
+	}
 	path, err := s.normalizePath(path)
 	if err != nil {
 		return fmt.Errorf("failed to normalize path: %w", err)

pkg/nvcdi/spec/spec_test.go

@@ -0,0 +1,181 @@
+/**
+# Copyright 2024 NVIDIA CORPORATION
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package spec
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"tags.cncf.io/container-device-interface/specs-go"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/transform"
+	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/transform/root"
+)
+
+func TestSpec(t *testing.T) {
+	testCases := []struct {
+		description      string
+		options          []Option
+		expectedNewError error
+		transform        transform.Transformer
+		expectedSpec     string
+	}{
+		{
+			description: "default options return empty spec",
+			expectedSpec: `---
+cdiVersion: 0.3.0
+containerEdits: {}
+devices: null
+kind: nvidia.com/gpu
+`,
+		},
+		{
+			description: "version is overridden",
+			options:     []Option{WithVersion("0.5.0")},
+			expectedSpec: `---
+cdiVersion: 0.5.0
+containerEdits: {}
+devices: null
+kind: nvidia.com/gpu
+`,
+		},
+		{
+			description: "raw spec is used as is",
+			options: []Option{WithRawSpec(
+				&specs.Spec{
+					Version: "0.5.0",
+					Kind:    "nvidia.com/gpu",
+					ContainerEdits: specs.ContainerEdits{
+						Env: []string{"FOO=bar"},
+					},
+				},
+			)},
+			expectedSpec: `---
+cdiVersion: 0.5.0
+containerEdits:
+  env:
+  - FOO=bar
+devices: null
+kind: nvidia.com/gpu
+`,
+		},
+		{
+			description: "raw spec with no version uses minimum version",
+			options: []Option{WithRawSpec(
+				&specs.Spec{
+					Kind: "nvidia.com/gpu",
+					ContainerEdits: specs.ContainerEdits{
+						Env: []string{"FOO=bar"},
+					},
+				},
+			)},
+			expectedSpec: `---
+cdiVersion: 0.3.0
+containerEdits:
+  env:
+  - FOO=bar
+devices: null
+kind: nvidia.com/gpu
+`,
+		},
+		{
+			description: "spec with host dev path uses 0.5.0 version",
+			options: []Option{WithRawSpec(
+				&specs.Spec{
+					Kind: "nvidia.com/gpu",
+					ContainerEdits: specs.ContainerEdits{
+						Env: []string{"FOO=bar"},
+						DeviceNodes: []*specs.DeviceNode{
+							{
+								HostPath: "/some/dev/dev0",
+								Path:     "/dev/dev0",
+							},
+						},
+					},
+				},
+			)},
+			expectedSpec: `---
+cdiVersion: 0.5.0
+containerEdits:
+  deviceNodes:
+  - hostPath: /some/dev/dev0
+    path: /dev/dev0
+  env:
+  - FOO=bar
+devices: null
+kind: nvidia.com/gpu
+`,
+		},
+		{
+			description: "transformed spec uses minimum version",
+			options: []Option{WithRawSpec(
+				&specs.Spec{
+					Kind: "nvidia.com/gpu",
+					ContainerEdits: specs.ContainerEdits{
+						Env: []string{"FOO=bar"},
+						DeviceNodes: []*specs.DeviceNode{
+							{
+								HostPath: "/some/dev/dev0",
+								Path:     "/dev/dev0",
+							},
+						},
+					},
+				},
+			)},
+			transform: transform.Merge(
+				root.New(
+					root.WithRoot("/some/dev/"),
+					root.WithTargetRoot("/dev/"),
+					root.WithRelativeTo("host"),
+				),
+				transform.NewSimplifier(),
+			),
+			expectedSpec: `---
+cdiVersion: 0.5.0
+containerEdits:
+  deviceNodes:
+  - hostPath: /dev/dev0
+    path: /dev/dev0
+  env:
+  - FOO=bar
+devices: null
+kind: nvidia.com/gpu
+`,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+
+			s, err := New(tc.options...)
+			require.ErrorIs(t, err, tc.expectedNewError)
+
+			if tc.transform != nil {
+				err := tc.transform.Transform(s.Raw())
+				require.NoError(t, err)
+			}
+
+			buf := new(bytes.Buffer)
+
+			_, err = s.WriteTo(buf)
+			require.NoError(t, err)
+
+			require.EqualValues(t, tc.expectedSpec, buf.String())
+		})
+	}
+}