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package layout
import (
"encoding/json"
"fmt"
"os"
"path/filepath"
"github.com/containers/image/v5/types"
imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
)
// This file is named reader.go for consistency with other transports’
// handling of “image containers”, but we don’t actually need a stateful reader object.
// ListResult wraps the image reference and the manifest for loading
type ListResult struct {
Reference types.ImageReference
ManifestDescriptor imgspecv1.Descriptor
}
// List returns a slice of manifests included in the archive
func List(dir string) ([]ListResult, error) {
var res []ListResult
indexJSON, err := os.ReadFile(filepath.Join(dir, imgspecv1.ImageIndexFile))
if err != nil {
return nil, err
}
var index imgspecv1.Index
if err := json.Unmarshal(indexJSON, &index); err != nil {
return nil, err
}
for manifestIndex, md := range index.Manifests {
refName := md.Annotations[imgspecv1.AnnotationRefName]
index := -1
if refName == "" {
index = manifestIndex
}
ref, err := newReference(dir, refName, index)
if err != nil {
return nil, fmt.Errorf("error creating image reference: %w", err)
}
reference := ListResult{
Reference: ref,
ManifestDescriptor: md,
}
res = append(res, reference)
}
return res, nil
}
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