# Pkgs-independent nix2container layer helpers, shared across the parity image
# repos (ii-agent, ii-researcher, temporal-based-ci, mempalace image,
# ComfyUI, …) so the reproducible=false rationale lives in exactly one place.
{
  # foldImageLayers buildLayer layers
  #
  #   buildLayer : nix2container's buildLayer function. Pass whichever attr the
  #                consumer's nix2container input exposes —
  #                `n2c.nix2container.buildLayer` or `n2c.buildLayer`.
  #   layers     : list of buildLayer component attrsets (deps / copyToRoot /
  #                perms / …) in base→top order.
  #
  # Each layer is built referencing all prior layers, with reproducible = false.
  # That is a DELIBERATE choice: it materialises each layer tar into the store so
  # the image streams verbatim from any host (remote-builder + binary-cache safe)
  # and avoids the cross-host "Digest did not match" that non-reproducible layer
  # deps (fenix rust, libllvm, …) otherwise trigger via nix2container's lazy tar
  # regeneration. Parity is asserted at the published digest, not byte-identical
  # tars — mkNix2ContainerPublish enforces that contract downstream.
  foldImageLayers =
    buildLayer: layers:
    let
      mergeToLayer =
        priorLayers: component:
        priorLayers
        ++ [
          (buildLayer (
            component
            // {
              layers = priorLayers;
              reproducible = false;
            }
          ))
        ];
    in
    builtins.foldl' mergeToLayer [ ] layers;
}