mirror of
https://github.com/mudler/luet.git
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132 lines
3.1 KiB
Go
132 lines
3.1 KiB
Go
// 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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"fmt"
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"io"
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"sync"
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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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type layoutImage struct {
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path Path
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desc v1.Descriptor
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manifestLock sync.Mutex // Protects rawManifest
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rawManifest []byte
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}
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var _ partial.CompressedImageCore = (*layoutImage)(nil)
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// Image reads a v1.Image with digest h from the Path.
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func (l Path) Image(h v1.Hash) (v1.Image, error) {
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ii, err := l.ImageIndex()
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if err != nil {
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return nil, err
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}
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return ii.Image(h)
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}
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func (li *layoutImage) MediaType() (types.MediaType, error) {
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return li.desc.MediaType, nil
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}
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// Implements WithManifest for partial.Blobset.
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func (li *layoutImage) Manifest() (*v1.Manifest, error) {
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return partial.Manifest(li)
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}
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func (li *layoutImage) RawManifest() ([]byte, error) {
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li.manifestLock.Lock()
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defer li.manifestLock.Unlock()
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if li.rawManifest != nil {
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return li.rawManifest, nil
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}
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b, err := li.path.Bytes(li.desc.Digest)
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if err != nil {
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return nil, err
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}
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li.rawManifest = b
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return li.rawManifest, nil
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}
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func (li *layoutImage) RawConfigFile() ([]byte, error) {
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manifest, err := li.Manifest()
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if err != nil {
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return nil, err
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}
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return li.path.Bytes(manifest.Config.Digest)
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}
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func (li *layoutImage) LayerByDigest(h v1.Hash) (partial.CompressedLayer, error) {
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manifest, err := li.Manifest()
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if err != nil {
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return nil, err
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}
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if h == manifest.Config.Digest {
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return partial.CompressedLayer(&compressedBlob{
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path: li.path,
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desc: manifest.Config,
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}), nil
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}
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for _, desc := range manifest.Layers {
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if h == desc.Digest {
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switch desc.MediaType {
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case types.OCILayer, types.DockerLayer:
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return partial.CompressedToLayer(&compressedBlob{
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path: li.path,
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desc: desc,
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})
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default:
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// TODO: We assume everything is a compressed blob, but that might not be true.
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// TODO: Handle foreign layers.
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return nil, fmt.Errorf("unexpected media type: %v for layer: %v", desc.MediaType, desc.Digest)
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}
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}
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}
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return nil, fmt.Errorf("could not find layer in image: %s", h)
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}
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type compressedBlob struct {
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path Path
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desc v1.Descriptor
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}
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func (b *compressedBlob) Digest() (v1.Hash, error) {
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return b.desc.Digest, nil
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}
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func (b *compressedBlob) Compressed() (io.ReadCloser, error) {
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return b.path.Blob(b.desc.Digest)
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}
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func (b *compressedBlob) Size() (int64, error) {
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return b.desc.Size, nil
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}
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func (b *compressedBlob) MediaType() (types.MediaType, error) {
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return b.desc.MediaType, nil
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}
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