quixos-protocol/nix/package-context.nix

# Workspace composition may reevaluate this projection after any graph edit.
# Only the canonical, source-free value becomes a package compilation input.
{
  pkgs,
  protocol,
  plan ? null,
  contexts ? null,
  contextData ? null,
  packageRevisionId,
}:
let
  projected = pkgs.runCommand "camino-package-context.json" { } ''
    ${pkgs.nodejs_24}/bin/node ${./package-context.mjs} \
      ${protocol}/libexec/quixos-protocol/execution-world.mjs ${plan} \
      ${pkgs.lib.escapeShellArg packageRevisionId} > "$out"
  '';
  context =
    if contextData != null then
      contextData
    else if contexts == null then
      builtins.fromJSON (builtins.readFile projected)
    else
      (builtins.fromJSON (builtins.readFile contexts)).${packageRevisionId};
in
{
  # This is typed semantic data (nominal IDs, types and generated source), never
  # Nix artifact paths. Remove the projection derivation's string context, not
  # any code/toolchain dependency. Those are separate explicit helper arguments.
  buildContract = builtins.toFile "camino-package-contract.json" (
    builtins.unsafeDiscardStringContext (builtins.toJSON context.contract)
  );
  sourceDigest = builtins.unsafeDiscardStringContext context.sourceDigest;
}