mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 08:18:32 +00:00
127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
/**
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# Copyright (c) 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 transform
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import (
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"fmt"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/edits"
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"tags.cncf.io/container-device-interface/pkg/cdi"
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"tags.cncf.io/container-device-interface/pkg/parser"
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"tags.cncf.io/container-device-interface/specs-go"
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)
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const (
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allDeviceName = "all"
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)
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type mergedDevice struct {
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name string
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skipIfExists bool
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simplifier Transformer
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}
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var _ Transformer = (*mergedDevice)(nil)
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// MergedDeviceOption is a function that configures a merged device
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type MergedDeviceOption func(*mergedDevice)
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// WithName sets the name of the merged device
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func WithName(name string) MergedDeviceOption {
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return func(m *mergedDevice) {
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m.name = name
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}
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}
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// WithSkipIfExists sets whether to skip adding the merged device if it already exists
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func WithSkipIfExists(skipIfExists bool) MergedDeviceOption {
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return func(m *mergedDevice) {
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m.skipIfExists = skipIfExists
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}
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}
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// NewMergedDevice creates a transformer with the specified options
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func NewMergedDevice(opts ...MergedDeviceOption) (Transformer, error) {
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m := &mergedDevice{}
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for _, opt := range opts {
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opt(m)
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}
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if m.name == "" {
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m.name = allDeviceName
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}
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m.simplifier = NewSimplifier()
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if err := parser.ValidateDeviceName(m.name); err != nil {
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return nil, fmt.Errorf("invalid device name %q: %v", m.name, err)
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}
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return m, nil
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}
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// Transform adds a merged device to the spec
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func (m mergedDevice) Transform(spec *specs.Spec) error {
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if spec == nil {
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return nil
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}
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mergedDevice, err := mergeDeviceSpecs(spec.Devices, m.name)
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if err != nil {
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return fmt.Errorf("failed to generate merged device %q: %v", m.name, err)
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}
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if mergedDevice == nil {
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if m.skipIfExists {
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return nil
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}
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return fmt.Errorf("device %q already exists", m.name)
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}
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spec.Devices = append(spec.Devices, *mergedDevice)
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if err := m.simplifier.Transform(spec); err != nil {
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return fmt.Errorf("failed to simplify spec after merging device %q: %v", m.name, err)
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}
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return nil
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}
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// mergeDeviceSpecs creates a device with the specified name which combines the edits from the previous devices.
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// If a device of the specified name already exists, no device is created and nil is returned.
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func mergeDeviceSpecs(deviceSpecs []specs.Device, mergedDeviceName string) (*specs.Device, error) {
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for _, d := range deviceSpecs {
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if d.Name == mergedDeviceName {
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return nil, nil
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}
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}
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mergedEdits := edits.NewContainerEdits()
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for _, d := range deviceSpecs {
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d := d
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edit := cdi.ContainerEdits{
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ContainerEdits: &d.ContainerEdits,
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}
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mergedEdits.Append(&edit)
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}
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merged := specs.Device{
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Name: mergedDeviceName,
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ContainerEdits: *mergedEdits.ContainerEdits,
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}
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return &merged, nil
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}
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