Struct LayerRef 

pub struct LayerRef {
    pub digest: String,
    pub media_type: String,
    pub size: i64,
    pub urls: Vec<String>,
}

One base-image layer reference threaded into BuildSkeleton.

Mirrors the subset of an OCI layer descriptor the WCOW builder needs: the digest (content-addressable hash of the compressed blob), the media type (drives decompression + foreign-layer detection), the byte size, and the optional mirror URL list (non-empty for MCR foreign Windows base layers). Subsequent tasks 4.D/4.E pass these descriptors through to the final manifest unchanged.

Fields

digest: String

sha256:... digest of the compressed blob.

media_type: String

OCI media type — e.g. application/vnd.docker.image.rootfs.foreign.diff.tar.gzip for MCR foreign Windows layers, or application/vnd.oci.image.layer.v1.tar+gzip for ordinary OCI layers.

size: i64

Compressed size in bytes (i64 because that’s the type oci-client uses for descriptor size — keeping the same shape avoids lossy casts on round-trip).

urls: Vec<String>

Optional mirror URLs (foreign layer urls[] per the OCI spec). Non-empty for MCR Windows base layers; empty for ordinary registry-resident layers. Preserved verbatim through to the emitted manifest in task 4.D.

Trait Implementations

impl Clone for LayerRef

fn clone(&self) -> LayerRef

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LayerRef

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.