Merge branch 'opengl-poc' into 'main'

Add support for injecting vulkan configs and libraries

See merge request nvidia/container-toolkit/container-toolkit!196

internal/modifier/graphics.go

@@ -0,0 +1,67 @@
+/**
+# Copyright (c) 2022, NVIDIA CORPORATION.  All rights reserved.
+#
+# 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 modifier
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/config"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/config/image"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/discover"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
+	"github.com/sirupsen/logrus"
+)
+
+// NewGraphicsModifier constructs a modifier that injects graphics-related modifications into an OCI runtime specification.
+// The value of the NVIDIA_DRIVER_CAPABILITIES environment variable is checked to determine if this modification should be made.
+func NewGraphicsModifier(logger *logrus.Logger, cfg *config.Config, ociSpec oci.Spec) (oci.SpecModifier, error) {
+	rawSpec, err := ociSpec.Load()
+	if err != nil {
+		return nil, fmt.Errorf("failed to load OCI spec: %v", err)
+	}
+
+	image, err := image.NewCUDAImageFromSpec(rawSpec)
+	if err != nil {
+		return nil, err
+	}
+
+	if devices := image.DevicesFromEnvvars(visibleDevicesEnvvar); len(devices) == 0 {
+		logger.Infof("No modification required; no devices requested")
+		return nil, nil
+	}
+
+	var hasGraphics bool
+	for _, c := range strings.Split(image["NVIDIA_DRIVER_CAPABILITIES"], ",") {
+		if c == "graphics" || c == "all" {
+			hasGraphics = true
+			break
+		}
+	}
+
+	if !hasGraphics {
+		logger.Debugf("Capability %q not selected", "graphics")
+		return nil, nil
+	}
+
+	d, err := discover.NewGraphicsDiscoverer(logger, cfg.NVIDIAContainerCLIConfig.Root)
+	if err != nil {
+		return nil, fmt.Errorf("failed to construct discoverer: %v", err)
+	}
+
+	return NewModifierFromDiscoverer(logger, d)
+}