mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
7627d48a5c
Signed-off-by: Tariq Ibrahim <tibrahim@nvidia.com> Signed-off-by: Evan Lezar <elezar@nvidia.com>
117 lines
3.3 KiB
Go
117 lines
3.3 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 root
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import (
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"fmt"
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"strings"
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"tags.cncf.io/container-device-interface/specs-go"
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"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/transform"
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)
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// hostRootTransformer transforms the roots of host paths in a CDI spec.
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type hostRootTransformer transformer
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var _ transform.Transformer = (*hostRootTransformer)(nil)
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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 hostRootTransformer) 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 hostRootTransformer) applyToEdits(edits *specs.ContainerEdits) error {
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for i, dn := range edits.DeviceNodes {
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edits.DeviceNodes[i] = t.transformDeviceNode(dn)
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}
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for i, hook := range edits.Hooks {
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edits.Hooks[i] = t.transformHook(hook)
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}
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for i, mount := range edits.Mounts {
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edits.Mounts[i] = t.transformMount(mount)
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}
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return nil
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}
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func (t hostRootTransformer) transformDeviceNode(dn *specs.DeviceNode) *specs.DeviceNode {
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if dn.HostPath == "" {
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dn.HostPath = dn.Path
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}
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dn.HostPath = t.transformPath(dn.HostPath)
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return dn
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}
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func (t hostRootTransformer) transformHook(hook *specs.Hook) *specs.Hook {
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// The Path in the startContainer hook MUST resolve in the container namespace.
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if hook.HookName != "startContainer" {
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hook.Path = t.transformPath(hook.Path)
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}
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// The createContainer and startContainer hooks MUST execute in the container namespace.
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if hook.HookName == "createContainer" || hook.HookName == "startContainer" {
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return hook
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}
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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.SplitN(arg, "::", 2)
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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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return hook
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}
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func (t hostRootTransformer) transformMount(mount *specs.Mount) *specs.Mount {
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mount.HostPath = t.transformPath(mount.HostPath)
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return mount
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}
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func (t hostRootTransformer) transformPath(path string) string {
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return (transformer)(t).transformPath(path)
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}
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