stargzutil

func HasNonStargzLayer ¶

func HasNonStargzLayer(ctx context.Context, resolver remotes.Resolver, matcher platforms.MatchComparer, ref string) (bool, error)

HasNonStargzLayer traverses a manifest by resolving the reference and walking over its children to see if there's any non-stargz layers.

If ref points to a manifest list, the platform matcher is used to only consider the current platform. Although BuildKit supports building manifest lists, and multi-platform conversion is technically possible client side, it requires pulling blobs locally (not via BuildKit) which is undesirable.

See: https://github.com/containerd/stargz-snapshotter/blob/v0.6.4/nativeconverter/estargz/estargz.go