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162 lines
3.9 KiB
162 lines
3.9 KiB
1 year ago
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// Copyright 2018 Google LLC 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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package layout
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"os"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/partial"
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"github.com/google/go-containerregistry/pkg/v1/types"
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)
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var _ v1.ImageIndex = (*layoutIndex)(nil)
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type layoutIndex struct {
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mediaType types.MediaType
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path Path
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rawIndex []byte
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}
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// ImageIndexFromPath is a convenience function which constructs a Path and returns its v1.ImageIndex.
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func ImageIndexFromPath(path string) (v1.ImageIndex, error) {
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lp, err := FromPath(path)
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if err != nil {
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return nil, err
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}
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return lp.ImageIndex()
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}
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// ImageIndex returns a v1.ImageIndex for the Path.
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func (l Path) ImageIndex() (v1.ImageIndex, error) {
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rawIndex, err := os.ReadFile(l.path("index.json"))
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if err != nil {
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return nil, err
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}
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idx := &layoutIndex{
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mediaType: types.OCIImageIndex,
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path: l,
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rawIndex: rawIndex,
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}
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return idx, nil
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}
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func (i *layoutIndex) MediaType() (types.MediaType, error) {
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return i.mediaType, nil
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}
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func (i *layoutIndex) Digest() (v1.Hash, error) {
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return partial.Digest(i)
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}
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func (i *layoutIndex) Size() (int64, error) {
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return partial.Size(i)
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}
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func (i *layoutIndex) IndexManifest() (*v1.IndexManifest, error) {
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var index v1.IndexManifest
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err := json.Unmarshal(i.rawIndex, &index)
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return &index, err
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}
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func (i *layoutIndex) RawManifest() ([]byte, error) {
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return i.rawIndex, nil
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}
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func (i *layoutIndex) Image(h v1.Hash) (v1.Image, error) {
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// Look up the digest in our manifest first to return a better error.
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desc, err := i.findDescriptor(h)
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if err != nil {
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return nil, err
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}
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if !isExpectedMediaType(desc.MediaType, types.OCIManifestSchema1, types.DockerManifestSchema2) {
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return nil, fmt.Errorf("unexpected media type for %v: %s", h, desc.MediaType)
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}
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img := &layoutImage{
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path: i.path,
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desc: *desc,
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}
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return partial.CompressedToImage(img)
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}
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func (i *layoutIndex) ImageIndex(h v1.Hash) (v1.ImageIndex, error) {
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// Look up the digest in our manifest first to return a better error.
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desc, err := i.findDescriptor(h)
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if err != nil {
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return nil, err
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}
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if !isExpectedMediaType(desc.MediaType, types.OCIImageIndex, types.DockerManifestList) {
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return nil, fmt.Errorf("unexpected media type for %v: %s", h, desc.MediaType)
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}
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rawIndex, err := i.path.Bytes(h)
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if err != nil {
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return nil, err
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}
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return &layoutIndex{
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mediaType: desc.MediaType,
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path: i.path,
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rawIndex: rawIndex,
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}, nil
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}
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func (i *layoutIndex) Blob(h v1.Hash) (io.ReadCloser, error) {
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return i.path.Blob(h)
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}
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func (i *layoutIndex) findDescriptor(h v1.Hash) (*v1.Descriptor, error) {
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im, err := i.IndexManifest()
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if err != nil {
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return nil, err
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}
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if h == (v1.Hash{}) {
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if len(im.Manifests) != 1 {
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return nil, errors.New("oci layout must contain only a single image to be used with layout.Image")
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}
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return &(im.Manifests)[0], nil
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}
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for _, desc := range im.Manifests {
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if desc.Digest == h {
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return &desc, nil
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}
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}
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return nil, fmt.Errorf("could not find descriptor in index: %s", h)
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}
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// TODO: Pull this out into methods on types.MediaType? e.g. instead, have:
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// * mt.IsIndex()
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// * mt.IsImage()
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func isExpectedMediaType(mt types.MediaType, expected ...types.MediaType) bool {
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for _, allowed := range expected {
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if mt == allowed {
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return true
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}
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}
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return false
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}
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