Function ResourceUsage

pkg/imgutil/imgutil.go:398–424

ResourceUsage will return: - the Usage value of the resource referenced by ID - the cumulative Usage value of the resource, and all parents, recursively Typically, for a running container, this will equal the size of the read-write layer, plus the sum of the size of all layers in the base image

(ctx context.Context, snapshotter snapshots.Snapshotter, resourceID string)

// - the cumulative Usage value of the resource, and all parents, recursively
// Typically, for a running container, this will equal the size of the read-write layer, plus the sum of the size of all layers in the base image
func ResourceUsage(ctx context.Context, snapshotter snapshots.Snapshotter, resourceID string) (snapshots.Usage, snapshots.Usage, error) {
	first := snapshots.Usage{}
	total := snapshots.Usage{}
	var info snapshots.Info
	for next := resourceID; next != ""; next = info.Parent {
		// Get the resource usage info
		usage, err := snapshotter.Usage(ctx, next)
		if err != nil {
			return first, total, err
		}
		// In case that's the first one, store that
		if next == resourceID {
			first = usage
		}
		// And increment totals
		total.Size += usage.Size
		total.Inodes += usage.Inodes

		// Now, get the parent, if any and iterate
		info, err = snapshotter.Stat(ctx, next)
		if err != nil {
			return first, total, err
		}
	}

	return first, total, nil
}

// UnpackedImageSize is the size of the unpacked snapshots.
// Does not contain the size of the blobs in the content store. (Corresponds to Docker).