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// Copyright 2023 Sylabs Inc. All rights reserved.
//
// SPDX-License-Identifier: Apache-2.0
package sif
import (
"bytes"
"encoding/json"
"errors"
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
"github.com/sylabs/sif/v2/pkg/sif"
)
var _ v1.ImageIndex = (*imageIndex)(nil)
// ImageIndexFromFileImage returns a v1.ImageIndex corresponding to f.
func ImageIndexFromFileImage(fi *sif.FileImage) (v1.ImageIndex, error) {
f := &fileImage{fi}
return f.ImageIndex()
}
type imageIndex struct {
f *fileImage
desc *v1.Descriptor
rawManifest []byte
}
// ImageIndex returns a v1.ImageIndex from f.
func (f *fileImage) ImageIndex() (v1.ImageIndex, error) {
d, err := f.GetDescriptor(
sif.WithDataType(sif.DataOCIRootIndex),
)
if err != nil {
return nil, err
}
b, err := d.GetData()
if err != nil {
return nil, err
}
digest, size, err := v1.SHA256(bytes.NewReader(b))
if err != nil {
return nil, err
}
return &imageIndex{
f: f,
desc: &v1.Descriptor{
MediaType: types.OCIImageIndex,
Size: size,
Digest: digest,
},
rawManifest: b,
}, nil
}
// MediaType of this image's manifest.
func (ix *imageIndex) MediaType() (types.MediaType, error) {
return ix.desc.MediaType, nil
}
// Digest returns the sha256 of this index's manifest.
func (ix *imageIndex) Digest() (v1.Hash, error) {
return ix.desc.Digest, nil
}
// Size returns the size of the manifest.
func (ix *imageIndex) Size() (int64, error) {
return ix.desc.Size, nil
}
// IndexManifest returns this image index's manifest object.
func (ix *imageIndex) IndexManifest() (*v1.IndexManifest, error) {
var im v1.IndexManifest
err := json.Unmarshal(ix.rawManifest, &im)
return &im, err
}
// RawManifest returns the serialized bytes of IndexManifest().
func (ix *imageIndex) RawManifest() ([]byte, error) {
return ix.rawManifest, nil
}
// Descriptor returns the original descriptor from an index manifest. See partial.Descriptor.
func (ix *imageIndex) Descriptor() (*v1.Descriptor, error) {
return ix.desc, nil
}
var errUnexpectedMediaType = errors.New("unexpected media type")
// Image returns a v1.Image that this ImageIndex references.
func (ix *imageIndex) Image(h v1.Hash) (v1.Image, error) {
desc, err := ix.findDescriptor(h)
if err != nil {
return nil, err
}
if mt := desc.MediaType; !mt.IsImage() {
return nil, fmt.Errorf("%w for %v: %v", errUnexpectedMediaType, h, desc.MediaType)
}
b, err := ix.f.Bytes(h)
if err != nil {
return nil, err
}
img := image{
f: ix.f,
desc: desc,
rawManifest: b,
}
return &img, nil
}
// ImageIndex returns a v1.ImageIndex that this ImageIndex references.
func (ix *imageIndex) ImageIndex(h v1.Hash) (v1.ImageIndex, error) {
desc, err := ix.findDescriptor(h)
if err != nil {
return nil, err
}
if mt := desc.MediaType; !mt.IsIndex() {
return nil, fmt.Errorf("%w for %v: %v", errUnexpectedMediaType, h, desc.MediaType)
}
b, err := ix.f.Bytes(h)
if err != nil {
return nil, err
}
return &imageIndex{
f: ix.f,
desc: desc,
rawManifest: b,
}, nil
}
var errDescriptorNotFoundInIndex = errors.New("descriptor not found in index")
// findDescriptor returns the descriptor with the supplied digest.
func (ix *imageIndex) findDescriptor(h v1.Hash) (*v1.Descriptor, error) {
im, err := ix.IndexManifest()
if err != nil {
return nil, err
}
for _, desc := range im.Manifests {
if desc.Digest == h {
return &desc, nil
}
}
return nil, fmt.Errorf("%w: %s", errDescriptorNotFoundInIndex, h)
}
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