126 lines
4.1 KiB
Go
126 lines
4.1 KiB
Go
/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 containerd
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import (
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"context"
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"fmt"
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"runtime"
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tasks "github.com/containerd/containerd/api/services/tasks/v1"
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"github.com/containerd/containerd/containers"
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"github.com/containerd/containerd/diff"
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"github.com/containerd/containerd/rootfs"
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"github.com/containerd/containerd/runtime/v2/runc/options"
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"github.com/containerd/typeurl"
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imagespec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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var (
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// ErrCheckpointRWUnsupported is returned if the container runtime does not support checkpoint
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ErrCheckpointRWUnsupported = errors.New("rw checkpoint is only supported on v2 runtimes")
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// ErrMediaTypeNotFound returns an error when a media type in the manifest is unknown
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ErrMediaTypeNotFound = errors.New("media type not found")
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// ErrCheckpointIndexImageNameNotFound is returned when the checkpoint image name is not present in the index
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ErrCheckpointIndexImageNameNotFound = errors.New("image name not present in index")
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// ErrCheckpointIndexRuntimeNameNotFound is returned when the checkpoint runtime name is not present in the index
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ErrCheckpointIndexRuntimeNameNotFound = errors.New("runtime name not present in index")
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)
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// CheckpointOpts are options to manage the checkpoint operation
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type CheckpointOpts func(context.Context, *Client, *containers.Container, *imagespec.Index, *options.CheckpointOptions) error
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// WithCheckpointImage includes the container image in the checkpoint
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func WithCheckpointImage(ctx context.Context, client *Client, c *containers.Container, index *imagespec.Index, copts *options.CheckpointOptions) error {
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ir, err := client.ImageService().Get(ctx, c.Image)
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if err != nil {
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return err
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}
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index.Manifests = append(index.Manifests, ir.Target)
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return nil
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}
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// WithCheckpointTask includes the running task
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func WithCheckpointTask(ctx context.Context, client *Client, c *containers.Container, index *imagespec.Index, copts *options.CheckpointOptions) error {
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any, err := typeurl.MarshalAny(copts)
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if err != nil {
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return nil
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}
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task, err := client.TaskService().Checkpoint(ctx, &tasks.CheckpointTaskRequest{
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ContainerID: c.ID,
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Options: any,
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})
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if err != nil {
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return err
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}
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for _, d := range task.Descriptors {
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index.Manifests = append(index.Manifests, imagespec.Descriptor{
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MediaType: d.MediaType,
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Size: d.Size_,
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Digest: d.Digest,
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Platform: &imagespec.Platform{
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OS: runtime.GOOS,
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Architecture: runtime.GOARCH,
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},
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})
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}
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return nil
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}
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// WithCheckpointRW includes the rw in the checkpoint
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func WithCheckpointRW(ctx context.Context, client *Client, c *containers.Container, index *imagespec.Index, copts *options.CheckpointOptions) error {
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cnt, err := client.LoadContainer(ctx, c.ID)
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if err != nil {
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return err
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}
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info, err := cnt.Info(ctx)
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if err != nil {
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return err
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}
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diffOpts := []diff.Opt{
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diff.WithReference(fmt.Sprintf("checkpoint-rw-%s", info.SnapshotKey)),
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}
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rw, err := rootfs.CreateDiff(ctx,
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info.SnapshotKey,
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client.SnapshotService(info.Snapshotter),
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client.DiffService(),
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diffOpts...,
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)
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if err != nil {
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return err
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}
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rw.Platform = &imagespec.Platform{
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OS: runtime.GOOS,
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Architecture: runtime.GOARCH,
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}
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index.Manifests = append(index.Manifests, rw)
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return nil
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}
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// GetIndexByMediaType returns the index in a manifest for the specified media type
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func GetIndexByMediaType(index *imagespec.Index, mt string) (*imagespec.Descriptor, error) {
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for _, d := range index.Manifests {
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if d.MediaType == mt {
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return &d, nil
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}
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}
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return nil, ErrMediaTypeNotFound
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}
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