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package toc
import (
"errors"
"github.com/containers/storage/pkg/chunked/internal/minimal"
digest "github.com/opencontainers/go-digest"
)
// tocJSONDigestAnnotation is the annotation key for the digest of the estargz
// TOC JSON.
// It is defined in github.com/containerd/stargz-snapshotter/estargz as TOCJSONDigestAnnotation
// Duplicate it here to avoid a dependency on the package.
const tocJSONDigestAnnotation = "containerd.io/snapshot/stargz/toc.digest"
// GetTOCDigest returns the digest of the TOC as recorded in the annotations.
// This function retrieves a digest that represents the content of a
// table of contents (TOC) from the image's annotations.
// This is an experimental feature and may be changed/removed in the future.
func GetTOCDigest(annotations map[string]string) (*digest.Digest, error) {
d1, ok1 := annotations[tocJSONDigestAnnotation]
d2, ok2 := annotations[minimal.ManifestChecksumKey]
switch {
case ok1 && ok2:
return nil, errors.New("both zstd:chunked and eStargz TOC found")
case ok1:
d, err := digest.Parse(d1)
if err != nil {
return nil, err
}
return &d, nil
case ok2:
d, err := digest.Parse(d2)
if err != nil {
return nil, err
}
return &d, nil
default:
return nil, nil
}
}
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