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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.
// This is an EXPERIMENTAL package, and may change in arbitrary ways without notice.
package layout
import (
"fmt"
"io/fs"
"path/filepath"
"strings"
v1 "github.com/google/go-containerregistry/pkg/v1"
)
// GarbageCollect removes unreferenced blobs from the oci-layout
//
// This is an experimental api, and not subject to any stability guarantees
// We may abandon it at any time, without prior notice.
// Deprecated: Use it at your own risk!
func (l Path) GarbageCollect() ([]v1.Hash, error) {
idx, err := l.ImageIndex()
if err != nil {
return nil, err
}
blobsToKeep := map[string]bool{}
if err := l.garbageCollectImageIndex(idx, blobsToKeep); err != nil {
return nil, err
}
blobsDir := l.path("blobs")
removedBlobs := []v1.Hash{}
err = filepath.WalkDir(blobsDir, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
rel, err := filepath.Rel(blobsDir, path)
if err != nil {
return err
}
hashString := strings.Replace(rel, "/", ":", 1)
if present := blobsToKeep[hashString]; !present {
h, err := v1.NewHash(hashString)
if err != nil {
return err
}
removedBlobs = append(removedBlobs, h)
}
return nil
})
if err != nil {
return nil, err
}
return removedBlobs, nil
}
func (l Path) garbageCollectImageIndex(index v1.ImageIndex, blobsToKeep map[string]bool) error {
idxm, err := index.IndexManifest()
if err != nil {
return err
}
h, err := index.Digest()
if err != nil {
return err
}
blobsToKeep[h.String()] = true
for _, descriptor := range idxm.Manifests {
if descriptor.MediaType.IsImage() {
img, err := index.Image(descriptor.Digest)
if err != nil {
return err
}
if err := l.garbageCollectImage(img, blobsToKeep); err != nil {
return err
}
} else if descriptor.MediaType.IsIndex() {
idx, err := index.ImageIndex(descriptor.Digest)
if err != nil {
return err
}
if err := l.garbageCollectImageIndex(idx, blobsToKeep); err != nil {
return err
}
} else {
return fmt.Errorf("gc: unknown media type: %s", descriptor.MediaType)
}
}
return nil
}
func (l Path) garbageCollectImage(image v1.Image, blobsToKeep map[string]bool) error {
h, err := image.Digest()
if err != nil {
return err
}
blobsToKeep[h.String()] = true
h, err = image.ConfigName()
if err != nil {
return err
}
blobsToKeep[h.String()] = true
ls, err := image.Layers()
if err != nil {
return err
}
for _, l := range ls {
h, err := l.Digest()
if err != nil {
return err
}
blobsToKeep[h.String()] = true
}
return nil
}
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