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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 remote
import (
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
)
// MountableLayer wraps a v1.Layer in a shim that enables the layer to be
// "mounted" when published to another registry.
type MountableLayer struct {
v1.Layer
Reference name.Reference
}
// Descriptor retains the original descriptor from an image manifest.
// See partial.Descriptor.
func (ml *MountableLayer) Descriptor() (*v1.Descriptor, error) {
return partial.Descriptor(ml.Layer)
}
// Exists is a hack. See partial.Exists.
func (ml *MountableLayer) Exists() (bool, error) {
return partial.Exists(ml.Layer)
}
// mountableImage wraps the v1.Layer references returned by the embedded v1.Image
// in MountableLayer's so that remote.Write might attempt to mount them from their
// source repository.
type mountableImage struct {
v1.Image
Reference name.Reference
}
// Layers implements v1.Image
func (mi *mountableImage) Layers() ([]v1.Layer, error) {
ls, err := mi.Image.Layers()
if err != nil {
return nil, err
}
mls := make([]v1.Layer, 0, len(ls))
for _, l := range ls {
mls = append(mls, &MountableLayer{
Layer: l,
Reference: mi.Reference,
})
}
return mls, nil
}
// LayerByDigest implements v1.Image
func (mi *mountableImage) LayerByDigest(d v1.Hash) (v1.Layer, error) {
l, err := mi.Image.LayerByDigest(d)
if err != nil {
return nil, err
}
return &MountableLayer{
Layer: l,
Reference: mi.Reference,
}, nil
}
// LayerByDiffID implements v1.Image
func (mi *mountableImage) LayerByDiffID(d v1.Hash) (v1.Layer, error) {
l, err := mi.Image.LayerByDiffID(d)
if err != nil {
return nil, err
}
return &MountableLayer{
Layer: l,
Reference: mi.Reference,
}, nil
}
// Descriptor retains the original descriptor from an index manifest.
// See partial.Descriptor.
func (mi *mountableImage) Descriptor() (*v1.Descriptor, error) {
return partial.Descriptor(mi.Image)
}
// ConfigLayer retains the original reference so that it can be mounted.
// See partial.ConfigLayer.
func (mi *mountableImage) ConfigLayer() (v1.Layer, error) {
l, err := partial.ConfigLayer(mi.Image)
if err != nil {
return nil, err
}
return &MountableLayer{
Layer: l,
Reference: mi.Reference,
}, nil
}
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