mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-12-01 16:52:54 +00:00
121 lines
3.5 KiB
Go
121 lines
3.5 KiB
Go
/**
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# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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**/
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package modifier
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import (
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"fmt"
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"strings"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/config"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/config/image"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
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cdi "github.com/container-orchestrated-devices/container-device-interface/pkg/cdi"
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"github.com/opencontainers/runtime-spec/specs-go"
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"github.com/sirupsen/logrus"
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)
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type cdiModifier struct {
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logger *logrus.Logger
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devices []string
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}
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// NewCDIModifier creates an OCI spec modifier that determines the modifications to make based on the
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// CDI specifications available on the system. The NVIDIA_VISIBLE_DEVICES enviroment variable is
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// used to select the devices to include.
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func NewCDIModifier(logger *logrus.Logger, cfg *config.Config, ociSpec oci.Spec) (oci.SpecModifier, error) {
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devices, err := getDevicesFromSpec(ociSpec)
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if err != nil {
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return nil, fmt.Errorf("failed to get required devices from OCI specification: %v", err)
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}
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if len(devices) == 0 {
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logger.Debugf("No devices requested; no modification required.")
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return nil, nil
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}
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m := cdiModifier{
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logger: logger,
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devices: devices,
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}
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return m, nil
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}
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func getDevicesFromSpec(ociSpec oci.Spec) ([]string, error) {
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rawSpec, err := ociSpec.Load()
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if err != nil {
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return nil, fmt.Errorf("failed to load OCI spec: %v", err)
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}
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image, err := image.NewCUDAImageFromSpec(rawSpec)
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if err != nil {
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return nil, err
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}
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envDevices := image.DevicesFromEnvvars(visibleDevicesEnvvar)
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_, annotationDevices, err := cdi.ParseAnnotations(rawSpec.Annotations)
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if err != nil {
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return nil, fmt.Errorf("failed to parse container annotations: %v", err)
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}
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uniqueDevices := make(map[string]struct{})
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for _, name := range append(envDevices, annotationDevices...) {
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if !cdi.IsQualifiedName(name) {
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name = cdi.QualifiedName("nvidia.com", "gpu", name)
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}
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uniqueDevices[name] = struct{}{}
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}
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var devices []string
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for name := range uniqueDevices {
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devices = append(devices, name)
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}
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return devices, nil
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}
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// Modify loads the CDI registry and injects the specified CDI devices into the OCI runtime specification.
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func (m cdiModifier) Modify(spec *specs.Spec) error {
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registry := cdi.GetRegistry(
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cdi.WithAutoRefresh(false),
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)
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if errs := registry.GetErrors(); len(errs) > 0 {
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m.logger.Debugf("The following errors were triggered when creating the CDI registry: %v", errs)
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}
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devices := m.devices
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for _, d := range devices {
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if d == "nvidia.com/gpu=all" {
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devices = []string{}
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for _, candidate := range registry.DeviceDB().ListDevices() {
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if strings.HasPrefix(candidate, "nvidia.com/gpu=") {
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devices = append(devices, candidate)
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}
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}
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break
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}
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}
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m.logger.Debugf("Injecting devices using CDI: %v", devices)
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_, err := registry.InjectDevices(spec, devices...)
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if err != nil {
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return fmt.Errorf("failed to inject CDI devices: %v", err)
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}
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return nil
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}
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