mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-29 07:21:46 +00:00
115 lines
3.0 KiB
Go
115 lines
3.0 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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"path/filepath"
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"strings"
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"tags.cncf.io/container-device-interface/specs-go"
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)
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type rootTransformer struct {
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root string
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targetRoot string
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}
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var _ Transformer = (*rootTransformer)(nil)
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// NewRootTransformer creates a new transformer for modifying
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// the root for paths in a CDI spec. If both roots are identical,
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// this tranformer is a no-op.
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func NewRootTransformer(root string, targetRoot string) Transformer {
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if root == targetRoot {
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return NewNoopTransformer()
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}
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t := rootTransformer{
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root: root,
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targetRoot: targetRoot,
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}
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return t
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}
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// Transform replaces the root in a spec with a new root.
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// It walks the spec and replaces all host paths that start with root with the target root.
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func (t rootTransformer) 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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for _, d := range spec.Devices {
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d := d
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if err := t.applyToEdits(&d.ContainerEdits); err != nil {
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return fmt.Errorf("failed to apply root transform to device %s: %w", d.Name, err)
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}
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}
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if err := t.applyToEdits(&spec.ContainerEdits); err != nil {
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return fmt.Errorf("failed to apply root transform to spec: %w", err)
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}
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return nil
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}
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func (t rootTransformer) applyToEdits(edits *specs.ContainerEdits) error {
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for i, dn := range edits.DeviceNodes {
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dn.HostPath = t.transformPath(dn.HostPath)
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edits.DeviceNodes[i] = dn
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}
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for i, hook := range edits.Hooks {
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hook.Path = t.transformPath(hook.Path)
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var args []string
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for _, arg := range hook.Args {
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if !strings.Contains(arg, "::") {
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args = append(args, t.transformPath(arg))
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continue
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}
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// For the 'create-symlinks' hook, special care is taken for the
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// '--link' flag argument which takes the form <target>::<link>.
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// Both paths, the target and link paths, are transformed.
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split := strings.Split(arg, "::")
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if len(split) != 2 {
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return fmt.Errorf("unexpected number of '::' separators in hook argument")
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}
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split[0] = t.transformPath(split[0])
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split[1] = t.transformPath(split[1])
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args = append(args, strings.Join(split, "::"))
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}
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hook.Args = args
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edits.Hooks[i] = hook
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}
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for i, mount := range edits.Mounts {
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mount.HostPath = t.transformPath(mount.HostPath)
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edits.Mounts[i] = mount
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}
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return nil
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}
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func (t rootTransformer) transformPath(path string) string {
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if !strings.HasPrefix(path, t.root) {
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return path
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}
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return filepath.Join(t.targetRoot, strings.TrimPrefix(path, t.root))
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}
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