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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 partial
import (
"bytes"
"io"
"sync"
"github.com/google/go-containerregistry/internal/gzip"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// UncompressedLayer represents the bare minimum interface a natively
// uncompressed layer must implement for us to produce a v1.Layer
type UncompressedLayer interface {
// DiffID returns the Hash of the uncompressed layer.
DiffID() (v1.Hash, error)
// Uncompressed returns an io.ReadCloser for the uncompressed layer contents.
Uncompressed() (io.ReadCloser, error)
// Returns the mediaType for the compressed Layer
MediaType() (types.MediaType, error)
}
// uncompressedLayerExtender implements v1.Image using the uncompressed base properties.
type uncompressedLayerExtender struct {
UncompressedLayer
// Memoize size/hash so that the methods aren't twice as
// expensive as doing this manually.
hash v1.Hash
size int64
hashSizeError error
once sync.Once
}
// Compressed implements v1.Layer
func (ule *uncompressedLayerExtender) Compressed() (io.ReadCloser, error) {
u, err := ule.Uncompressed()
if err != nil {
return nil, err
}
return gzip.ReadCloser(u), nil
}
// Digest implements v1.Layer
func (ule *uncompressedLayerExtender) Digest() (v1.Hash, error) {
ule.calcSizeHash()
return ule.hash, ule.hashSizeError
}
// Size implements v1.Layer
func (ule *uncompressedLayerExtender) Size() (int64, error) {
ule.calcSizeHash()
return ule.size, ule.hashSizeError
}
func (ule *uncompressedLayerExtender) calcSizeHash() {
ule.once.Do(func() {
var r io.ReadCloser
r, ule.hashSizeError = ule.Compressed()
if ule.hashSizeError != nil {
return
}
defer r.Close()
ule.hash, ule.size, ule.hashSizeError = v1.SHA256(r)
})
}
// UncompressedToLayer fills in the missing methods from an UncompressedLayer so that it implements v1.Layer
func UncompressedToLayer(ul UncompressedLayer) (v1.Layer, error) {
return &uncompressedLayerExtender{UncompressedLayer: ul}, nil
}
// UncompressedImageCore represents the bare minimum interface a natively
// uncompressed image must implement for us to produce a v1.Image
type UncompressedImageCore interface {
ImageCore
// LayerByDiffID is a variation on the v1.Image method, which returns
// an UncompressedLayer instead.
LayerByDiffID(v1.Hash) (UncompressedLayer, error)
}
// UncompressedToImage fills in the missing methods from an UncompressedImageCore so that it implements v1.Image.
func UncompressedToImage(uic UncompressedImageCore) (v1.Image, error) {
return &uncompressedImageExtender{
UncompressedImageCore: uic,
}, nil
}
// uncompressedImageExtender implements v1.Image by extending UncompressedImageCore with the
// appropriate methods computed from the minimal core.
type uncompressedImageExtender struct {
UncompressedImageCore
lock sync.Mutex
manifest *v1.Manifest
}
// Assert that our extender type completes the v1.Image interface
var _ v1.Image = (*uncompressedImageExtender)(nil)
// Digest implements v1.Image
func (i *uncompressedImageExtender) Digest() (v1.Hash, error) {
return Digest(i)
}
// Manifest implements v1.Image
func (i *uncompressedImageExtender) Manifest() (*v1.Manifest, error) {
i.lock.Lock()
defer i.lock.Unlock()
if i.manifest != nil {
return i.manifest, nil
}
b, err := i.RawConfigFile()
if err != nil {
return nil, err
}
cfgHash, cfgSize, err := v1.SHA256(bytes.NewReader(b))
if err != nil {
return nil, err
}
m := &v1.Manifest{
SchemaVersion: 2,
MediaType: types.DockerManifestSchema2,
Config: v1.Descriptor{
MediaType: types.DockerConfigJSON,
Size: cfgSize,
Digest: cfgHash,
},
}
ls, err := i.Layers()
if err != nil {
return nil, err
}
m.Layers = make([]v1.Descriptor, len(ls))
for i, l := range ls {
desc, err := Descriptor(l)
if err != nil {
return nil, err
}
m.Layers[i] = *desc
}
i.manifest = m
return i.manifest, nil
}
// RawManifest implements v1.Image
func (i *uncompressedImageExtender) RawManifest() ([]byte, error) {
return RawManifest(i)
}
// Size implements v1.Image
func (i *uncompressedImageExtender) Size() (int64, error) {
return Size(i)
}
// ConfigName implements v1.Image
func (i *uncompressedImageExtender) ConfigName() (v1.Hash, error) {
return ConfigName(i)
}
// ConfigFile implements v1.Image
func (i *uncompressedImageExtender) ConfigFile() (*v1.ConfigFile, error) {
return ConfigFile(i)
}
// Layers implements v1.Image
func (i *uncompressedImageExtender) Layers() ([]v1.Layer, error) {
diffIDs, err := DiffIDs(i)
if err != nil {
return nil, err
}
ls := make([]v1.Layer, 0, len(diffIDs))
for _, h := range diffIDs {
l, err := i.LayerByDiffID(h)
if err != nil {
return nil, err
}
ls = append(ls, l)
}
return ls, nil
}
// LayerByDiffID implements v1.Image
func (i *uncompressedImageExtender) LayerByDiffID(diffID v1.Hash) (v1.Layer, error) {
ul, err := i.UncompressedImageCore.LayerByDiffID(diffID)
if err != nil {
return nil, err
}
return UncompressedToLayer(ul)
}
// LayerByDigest implements v1.Image
func (i *uncompressedImageExtender) LayerByDigest(h v1.Hash) (v1.Layer, error) {
diffID, err := BlobToDiffID(i, h)
if err != nil {
return nil, err
}
return i.LayerByDiffID(diffID)
}
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