/
image_ref_descriptors.go
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/
image_ref_descriptors.go
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// Copyright 2024 The Carvel Authors.
// SPDX-License-Identifier: Apache-2.0
package imagedesc
import (
"encoding/json"
"fmt"
"io"
"sort"
"strings"
"sync"
"carvel.dev/imgpkg/pkg/imgpkg/internal/util"
regname "github.com/google/go-containerregistry/pkg/name"
regv1 "github.com/google/go-containerregistry/pkg/v1"
regremote "github.com/google/go-containerregistry/pkg/v1/remote"
regtran "github.com/google/go-containerregistry/pkg/v1/remote/transport"
regtypes "github.com/google/go-containerregistry/pkg/v1/types"
"golang.org/x/sync/errgroup"
)
type Registry interface {
Get(regname.Reference) (*regremote.Descriptor, error)
Digest(regname.Reference) (regv1.Hash, error)
Index(regname.Reference) (regv1.ImageIndex, error)
Image(regname.Reference) (regv1.Image, error)
}
type Metadata struct {
Ref regname.Reference
Tag string
Labels map[string]string
OrigRef string
}
type ImageRefDescriptors struct {
registry Registry
descs []ImageOrImageIndexDescriptor
imageLayersLock sync.Mutex
imageLayers map[ImageLayerDescriptor]regv1.Layer
}
func NewImageRefDescriptorsFromBytes(data []byte) (*ImageRefDescriptors, error) {
var descs []ImageOrImageIndexDescriptor
err := json.Unmarshal(data, &descs)
if err != nil {
return nil, err
}
return &ImageRefDescriptors{descs: descs}, nil
}
func NewImageRefDescriptors(refs []Metadata, registry Registry) (*ImageRefDescriptors, error) {
registry = errRegistry{registry}
imageRefDescs := &ImageRefDescriptors{
registry: registry,
imageLayers: map[ImageLayerDescriptor]regv1.Layer{},
}
var imageRefDescsLock sync.Mutex
var wg errgroup.Group
buildThrottle := util.NewThrottle(10)
for _, ref := range refs {
ref := ref //copy
wg.Go(func() error {
buildThrottle.Take()
defer buildThrottle.Done()
regDesc, err := registry.Get(ref.Ref)
if err != nil {
return err
}
var td ImageOrImageIndexDescriptor
if imageRefDescs.isImageIndex(regDesc.Descriptor) {
imgIndexTd, err := imageRefDescs.buildImageIndex(ref, regDesc.Descriptor)
if err != nil {
return err
}
td = ImageOrImageIndexDescriptor{ImageIndex: &imgIndexTd}
} else {
img, err := imageRefDescs.buildImage(ref)
if err != nil {
return err
}
td = ImageOrImageIndexDescriptor{Image: &img}
}
imageRefDescsLock.Lock()
imageRefDescs.descs = append(imageRefDescs.descs, td)
imageRefDescsLock.Unlock()
return nil
})
}
err := wg.Wait()
return imageRefDescs, err
}
func (ids *ImageRefDescriptors) Descriptors() []ImageOrImageIndexDescriptor {
return ids.descs
}
func (ids *ImageRefDescriptors) buildImageIndex(ref Metadata, regDesc regv1.Descriptor) (ImageIndexDescriptor, error) {
td := ImageIndexDescriptor{
Refs: []string{ref.Ref.Name()},
MediaType: string(regDesc.MediaType),
Digest: regDesc.Digest.String(),
Tag: ref.Tag,
Labels: ref.Labels,
OrigRef: ref.OrigRef,
}
imgIndex, err := ids.registry.Index(ref.Ref)
if err != nil {
return td, err
}
rawManifest, err := imgIndex.RawManifest()
if err != nil {
return td, err
}
td.Raw = string(rawManifest)
imgIndexManifest, err := imgIndex.IndexManifest()
if err != nil {
return td, err
}
for _, manDesc := range imgIndexManifest.Manifests {
if ids.isImageIndex(manDesc) {
imgIndexTd, err := ids.buildImageIndex(Metadata{ids.buildRef(ref.Ref, manDesc.Digest.String()), ref.Tag, ref.Labels, ref.OrigRef}, manDesc)
if err != nil {
return ImageIndexDescriptor{}, err
}
td.Indexes = append(td.Indexes, imgIndexTd)
} else {
imgTd, err := ids.buildImage(Metadata{ids.buildRef(ref.Ref, manDesc.Digest.String()), ref.Tag, ref.Labels, ref.OrigRef})
if err != nil {
return ImageIndexDescriptor{}, err
}
td.Images = append(td.Images, imgTd)
}
}
return td, nil
}
func (ids *ImageRefDescriptors) buildImage(ref Metadata) (ImageDescriptor, error) {
td := ImageDescriptor{}
img, err := ids.registry.Image(ref.Ref)
if err != nil {
return td, err
}
cfgDigest, err := img.ConfigName()
if err != nil {
return td, err
}
cfgBlob, err := img.RawConfigFile()
if err != nil {
return td, err
}
manifestMediaType, err := img.MediaType()
if err != nil {
return td, err
}
manifestDigest, err := img.Digest()
if err != nil {
return td, err
}
manifestBlob, err := img.RawManifest()
if err != nil {
return td, err
}
td = ImageDescriptor{
Refs: []string{ref.Ref.String()},
Config: ConfigDescriptor{
Digest: cfgDigest.String(),
Raw: string(cfgBlob),
},
Manifest: ManifestDescriptor{
MediaType: string(manifestMediaType),
Digest: manifestDigest.String(),
Raw: string(manifestBlob),
},
Tag: ref.Tag,
Labels: ref.Labels,
OrigRef: ref.OrigRef,
}
layers, err := img.Layers()
if err != nil {
return td, err
}
for _, layer := range layers {
layerMediaType, err := layer.MediaType()
if err != nil {
return td, err
}
layerDigest, err := layer.Digest()
if err != nil {
return td, err
}
layerDiffID := ""
if layerMediaType.IsLayer() {
lDiffID, err := layer.DiffID()
if err != nil {
return td, err
}
layerDiffID = lDiffID.String()
}
layerSize, err := layer.Size()
if err != nil {
return td, err
}
layerTD := ImageLayerDescriptor{
MediaType: string(layerMediaType),
Digest: layerDigest.String(),
DiffID: layerDiffID,
Size: layerSize,
}
td.Layers = append(td.Layers, layerTD)
ids.imageLayersLock.Lock()
ids.imageLayers[layerTD] = layer
ids.imageLayersLock.Unlock()
}
return td, nil
}
func (*ImageRefDescriptors) isImageIndex(regDesc regv1.Descriptor) bool {
switch regDesc.MediaType {
case regtypes.OCIImageIndex, regtypes.DockerManifestList:
return true
}
return false
}
type wrappedCompressedLayerContents struct {
layer regv1.Layer
}
var _ LayerContents = wrappedCompressedLayerContents{}
func (lc wrappedCompressedLayerContents) Open() (io.ReadCloser, error) {
rc, err := lc.layer.Compressed()
if err != nil {
return nil, fmt.Errorf("Getting compressed layer: %s", err)
}
return rc, nil
}
func (ids *ImageRefDescriptors) FindLayer(layerTD ImageLayerDescriptor) (LayerContents, error) {
ids.imageLayersLock.Lock()
defer ids.imageLayersLock.Unlock()
layer, found := ids.imageLayers[layerTD]
if !found {
panic(fmt.Sprintf("Expected to find stream for %#v", layerTD))
}
return wrappedCompressedLayerContents{layer}, nil
}
func (ids *ImageRefDescriptors) AsBytes() ([]byte, error) {
// Ensure result is deterministic
sort.Slice(ids.descs, func(i, j int) bool {
return ids.descs[i].SortKey() < ids.descs[j].SortKey()
})
return json.Marshal(ids.descs)
}
func (ids *ImageRefDescriptors) buildRef(otherRef regname.Reference, digest string) regname.Reference {
newRef, err := regname.NewDigest(fmt.Sprintf("%s@%s", otherRef.Context().Name(), digest))
if err != nil {
panic(fmt.Sprintf("Building new ref"))
}
return newRef
}
type errRegistry struct {
delegate Registry
}
func (m errRegistry) Get(ref regname.Reference) (*regremote.Descriptor, error) {
regDesc, err := m.delegate.Get(ref)
return regDesc, m.betterErr(ref, err)
}
func (m errRegistry) Digest(ref regname.Reference) (regv1.Hash, error) {
regDesc, err := m.delegate.Digest(ref)
return regDesc, m.betterErr(ref, err)
}
func (m errRegistry) Index(ref regname.Reference) (regv1.ImageIndex, error) {
idx, err := m.delegate.Index(ref)
return idx, m.betterErr(ref, err)
}
func (m errRegistry) Image(ref regname.Reference) (regv1.Image, error) {
img, err := m.delegate.Image(ref)
return img, m.betterErr(ref, err)
}
func (m errRegistry) betterErr(ref regname.Reference, err error) error {
if err != nil {
if strings.Contains(err.Error(), string(regtran.ManifestUnknownErrorCode)) {
err = fmt.Errorf("Encountered an error most likely because this image is in Docker Registry v1 format; only v2 or OCI image format is supported (underlying error: %s)", err)
}
err = fmt.Errorf("Working with %s: %s", ref.Name(), err)
}
return err
}