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layout.go
140 lines (121 loc) · 3.31 KB
/
layout.go
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/*
* Copyright (c) 2019-Present Pivotal Software, Inc. 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 ggcr
import (
"fmt"
"github.com/pivotal/image-relocation/pkg/registry"
"os"
"github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/layout"
"github.com/pivotal/image-relocation/pkg/image"
)
const (
outputDirPermissions = 0755
refNameAnnotation = "org.opencontainers.image.ref.name"
)
func (r *client) NewLayout(path string) (registry.Layout, error) {
if _, err := os.Stat(path); err != nil {
if !os.IsNotExist(err) {
return nil, err
}
if err := os.MkdirAll(path, outputDirPermissions); err != nil {
return nil, err
}
}
lp, err := layout.Write(path, empty.Index)
if err != nil {
return nil, err
}
return &imageLayout{
registryClient: r,
layoutPath: lp,
}, nil
}
func (r *client) ReadLayout(path string) (registry.Layout, error) {
lp, err := layout.FromPath(path)
if err != nil {
return nil, err
}
return &imageLayout{
registryClient: r,
layoutPath: lp,
}, nil
}
type imageLayout struct {
registryClient *client
layoutPath registry.LayoutPath
}
func NewImageLayout(registryClient *client, layoutPath registry.LayoutPath) registry.Layout {
return &imageLayout{
registryClient: registryClient,
layoutPath: layoutPath,
}
}
func (l *imageLayout) Add(n image.Name) (image.Digest, error) {
img, err := l.registryClient.readRemoteImage(n)
if err != nil {
return image.EmptyDigest, err
}
annotations := map[string]string{
refNameAnnotation: n.String(),
}
if err:= img.AppendToLayout(l.layoutPath, layout.WithAnnotations(annotations)); err != nil {
return image.EmptyDigest, err
}
hash, err := img.Digest()
if err != nil {
return image.EmptyDigest, err
}
return image.NewDigest(hash.String())
}
func (l *imageLayout) Push(digest image.Digest, n image.Name) error {
hash, err := v1.NewHash(digest.String())
if err != nil {
return err
}
imageIndex, err := l.layoutPath.ImageIndex()
if err != nil {
return err
}
i, err := imageIndex.Image(hash)
if err != nil {
return err
}
return l.registryClient.writeRemoteImage(i, n)
}
func (l *imageLayout) Find(n image.Name) (image.Digest, error) {
imageIndex, err := l.layoutPath.ImageIndex()
if err != nil {
return image.EmptyDigest, err
}
indexMan, err := imageIndex.IndexManifest()
if err != nil {
return image.EmptyDigest, err
}
for _, imageMan := range indexMan.Manifests {
if ref, ok := imageMan.Annotations[refNameAnnotation]; ok {
r, err := image.NewName(ref)
if err != nil {
return image.EmptyDigest, err
}
if r == n {
return image.NewDigest(imageMan.Digest.String())
}
}
}
return image.EmptyDigest, fmt.Errorf("image %v not found in layout", n)
}