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// Copyright 2019 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 mutate
import (
"encoding/json"
"fmt"
"github.com/google/go-containerregistry/pkg/logs"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/match"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
func computeDescriptor(ia IndexAddendum) (*v1.Descriptor, error) {
desc, err := partial.Descriptor(ia.Add)
if err != nil {
return nil, err
}
// The IndexAddendum allows overriding Descriptor values.
if ia.Descriptor.Size != 0 {
desc.Size = ia.Descriptor.Size
}
if string(ia.Descriptor.MediaType) != "" {
desc.MediaType = ia.Descriptor.MediaType
}
if ia.Descriptor.Digest != (v1.Hash{}) {
desc.Digest = ia.Descriptor.Digest
}
if ia.Descriptor.Platform != nil {
desc.Platform = ia.Descriptor.Platform
}
if len(ia.Descriptor.URLs) != 0 {
desc.URLs = ia.Descriptor.URLs
}
if len(ia.Descriptor.Annotations) != 0 {
desc.Annotations = ia.Descriptor.Annotations
}
if ia.Descriptor.Data != nil {
desc.Data = ia.Descriptor.Data
}
return desc, nil
}
type index struct {
base v1.ImageIndex
adds []IndexAddendum
// remove is removed before adds
remove match.Matcher
computed bool
manifest *v1.IndexManifest
annotations map[string]string
mediaType *types.MediaType
imageMap map[v1.Hash]v1.Image
indexMap map[v1.Hash]v1.ImageIndex
layerMap map[v1.Hash]v1.Layer
subject *v1.Descriptor
}
var _ v1.ImageIndex = (*index)(nil)
func (i *index) MediaType() (types.MediaType, error) {
if i.mediaType != nil {
return *i.mediaType, nil
}
return i.base.MediaType()
}
func (i *index) Size() (int64, error) { return partial.Size(i) }
func (i *index) compute() error {
// Don't re-compute if already computed.
if i.computed {
return nil
}
i.imageMap = make(map[v1.Hash]v1.Image)
i.indexMap = make(map[v1.Hash]v1.ImageIndex)
i.layerMap = make(map[v1.Hash]v1.Layer)
m, err := i.base.IndexManifest()
if err != nil {
return err
}
manifest := m.DeepCopy()
manifests := manifest.Manifests
if i.remove != nil {
var cleanedManifests []v1.Descriptor
for _, m := range manifests {
if !i.remove(m) {
cleanedManifests = append(cleanedManifests, m)
}
}
manifests = cleanedManifests
}
for _, add := range i.adds {
desc, err := computeDescriptor(add)
if err != nil {
return err
}
manifests = append(manifests, *desc)
if idx, ok := add.Add.(v1.ImageIndex); ok {
i.indexMap[desc.Digest] = idx
} else if img, ok := add.Add.(v1.Image); ok {
i.imageMap[desc.Digest] = img
} else if l, ok := add.Add.(v1.Layer); ok {
i.layerMap[desc.Digest] = l
} else {
logs.Warn.Printf("Unexpected index addendum: %T", add.Add)
}
}
manifest.Manifests = manifests
if i.mediaType != nil {
manifest.MediaType = *i.mediaType
}
if i.annotations != nil {
if manifest.Annotations == nil {
manifest.Annotations = map[string]string{}
}
for k, v := range i.annotations {
manifest.Annotations[k] = v
}
}
manifest.Subject = i.subject
i.manifest = manifest
i.computed = true
return nil
}
func (i *index) Image(h v1.Hash) (v1.Image, error) {
if img, ok := i.imageMap[h]; ok {
return img, nil
}
return i.base.Image(h)
}
func (i *index) ImageIndex(h v1.Hash) (v1.ImageIndex, error) {
if idx, ok := i.indexMap[h]; ok {
return idx, nil
}
return i.base.ImageIndex(h)
}
type withLayer interface {
Layer(v1.Hash) (v1.Layer, error)
}
// Workaround for #819.
func (i *index) Layer(h v1.Hash) (v1.Layer, error) {
if layer, ok := i.layerMap[h]; ok {
return layer, nil
}
if wl, ok := i.base.(withLayer); ok {
return wl.Layer(h)
}
return nil, fmt.Errorf("layer not found: %s", h)
}
// Digest returns the sha256 of this image's manifest.
func (i *index) Digest() (v1.Hash, error) {
if err := i.compute(); err != nil {
return v1.Hash{}, err
}
return partial.Digest(i)
}
// Manifest returns this image's Manifest object.
func (i *index) IndexManifest() (*v1.IndexManifest, error) {
if err := i.compute(); err != nil {
return nil, err
}
return i.manifest.DeepCopy(), nil
}
// RawManifest returns the serialized bytes of Manifest()
func (i *index) RawManifest() ([]byte, error) {
if err := i.compute(); err != nil {
return nil, err
}
return json.Marshal(i.manifest)
}
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