oci-image 0.1.0

OCI container images on disk: image references, sha256 digests, one-pass layer unpack (whiteouts and opaque directories), gzip (parallel via lgz when the stream allows it, streaming zlib-rs otherwise) and zstd layers, a content-addressed store of blobs and per-layer directories in overlayfs format (each layer unpacked once, shared between images, refcounted, collected), overlay snapshot prep, and an optional anonymous registry pull.