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// Copyright 2018 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package layout
import (
"fmt"
"io"
"os"
"sync"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
type layoutImage struct {
path Path
desc v1.Descriptor
manifestLock sync.Mutex // Protects rawManifest
rawManifest []byte
}
var _ partial.CompressedImageCore = (*layoutImage)(nil)
// Image reads a v1.Image with digest h from the Path.
func (l Path) Image(h v1.Hash) (v1.Image, error) {
ii, err := l.ImageIndex()
if err != nil {
return nil, err
}
return ii.Image(h)
}
func (li *layoutImage) MediaType() (types.MediaType, error) {
return li.desc.MediaType, nil
}
// Implements WithManifest for partial.Blobset.
func (li *layoutImage) Manifest() (*v1.Manifest, error) {
return partial.Manifest(li)
}
func (li *layoutImage) RawManifest() ([]byte, error) {
li.manifestLock.Lock()
defer li.manifestLock.Unlock()
if li.rawManifest != nil {
return li.rawManifest, nil
}
b, err := li.path.Bytes(li.desc.Digest)
if err != nil {
return nil, err
}
li.rawManifest = b
return li.rawManifest, nil
}
func (li *layoutImage) RawConfigFile() ([]byte, error) {
manifest, err := li.Manifest()
if err != nil {
return nil, err
}
return li.path.Bytes(manifest.Config.Digest)
}
func (li *layoutImage) LayerByDigest(h v1.Hash) (partial.CompressedLayer, error) {
manifest, err := li.Manifest()
if err != nil {
return nil, err
}
if h == manifest.Config.Digest {
return &compressedBlob{
path: li.path,
desc: manifest.Config,
}, nil
}
for _, desc := range manifest.Layers {
if h == desc.Digest {
return &compressedBlob{
path: li.path,
desc: desc,
}, nil
}
}
return nil, fmt.Errorf("could not find layer in image: %s", h)
}
type compressedBlob struct {
path Path
desc v1.Descriptor
}
func (b *compressedBlob) Digest() (v1.Hash, error) {
return b.desc.Digest, nil
}
func (b *compressedBlob) Compressed() (io.ReadCloser, error) {
return b.path.Blob(b.desc.Digest)
}
func (b *compressedBlob) Size() (int64, error) {
return b.desc.Size, nil
}
func (b *compressedBlob) MediaType() (types.MediaType, error) {
return b.desc.MediaType, nil
}
// Descriptor implements partial.withDescriptor.
func (b *compressedBlob) Descriptor() (*v1.Descriptor, error) {
return &b.desc, nil
}
// See partial.Exists.
func (b *compressedBlob) Exists() (bool, error) {
_, err := os.Stat(b.path.blobPath(b.desc.Digest))
if os.IsNotExist(err) {
return false, nil
}
return err == nil, err
}
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