89 lines
2.8 KiB
Go
89 lines
2.8 KiB
Go
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/*
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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 docker
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/images"
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"github.com/containerd/containerd/log"
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"github.com/containerd/containerd/remotes"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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// LegacyConfigMediaType should be replaced by OCI image spec.
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//
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// More detail: docker/distribution#1622
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const LegacyConfigMediaType = "application/octet-stream"
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// ConvertManifest changes application/octet-stream to schema2 config media type if need.
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//
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// NOTE:
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// 1. original manifest will be deleted by next gc round.
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// 2. don't cover manifest list.
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func ConvertManifest(ctx context.Context, store content.Store, desc ocispec.Descriptor) (ocispec.Descriptor, error) {
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if !(desc.MediaType == images.MediaTypeDockerSchema2Manifest ||
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desc.MediaType == ocispec.MediaTypeImageManifest) {
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log.G(ctx).Warnf("do nothing for media type: %s", desc.MediaType)
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return desc, nil
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}
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// read manifest data
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mb, err := content.ReadBlob(ctx, store, desc)
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if err != nil {
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return ocispec.Descriptor{}, errors.Wrap(err, "failed to read index data")
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}
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var manifest ocispec.Manifest
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if err := json.Unmarshal(mb, &manifest); err != nil {
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return ocispec.Descriptor{}, errors.Wrap(err, "failed to unmarshal data into manifest")
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}
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// check config media type
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if manifest.Config.MediaType != LegacyConfigMediaType {
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return desc, nil
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}
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manifest.Config.MediaType = images.MediaTypeDockerSchema2Config
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data, err := json.MarshalIndent(manifest, "", " ")
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if err != nil {
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return ocispec.Descriptor{}, errors.Wrap(err, "failed to marshal manifest")
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}
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// update manifest with gc labels
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desc.Digest = digest.Canonical.FromBytes(data)
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desc.Size = int64(len(data))
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labels := map[string]string{}
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for i, c := range append([]ocispec.Descriptor{manifest.Config}, manifest.Layers...) {
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labels[fmt.Sprintf("containerd.io/gc.ref.content.%d", i)] = c.Digest.String()
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}
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ref := remotes.MakeRefKey(ctx, desc)
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if err := content.WriteBlob(ctx, store, ref, bytes.NewReader(data), desc, content.WithLabels(labels)); err != nil {
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return ocispec.Descriptor{}, errors.Wrap(err, "failed to update content")
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}
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return desc, nil
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}
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