Inspect constructor values and contexts without unrelated derivation closures (#931)

source-qualification.nix

@@ -5,8 +5,7 @@
 }:
 let
   comparisonIdentity = import ../tools/local-first/derivation-identity.nix;
-  # Inspect the actual .drv as data, without its derivation-deep output context.
-  productionDerivation = builtins.unsafeDiscardOutputDependency library.drvPath;
+  inspect = import ./source-qualification-metadata.nix;
   source = pkgs.lib.fileset.toSource {
     root = ./.;
     fileset = pkgs.lib.fileset.unions [
@@ -23,6 +22,7 @@ let
       ./tsconfig.build.json
       ./tsconfig.test.json
       ./default.nix
+      ./source-qualification-metadata.nix
       ./yarn-project.nix
       ./flake.nix
       ./README.md
@@ -30,23 +30,19 @@ let
   };
   inputs = pkgs.writeText "protocol-source-inputs.json" (
     builtins.toJSON {
-      inherit source nixpkgsNarHash productionDerivation;
+      inherit source nixpkgsNarHash;
       narHashContext = builtins.getContext nixpkgsNarHash;
       evaluatorVersion = builtins.nixVersion;
       pinnedNixVersion = pkgs.nix.version;
       nixpkgs = pkgs.path;
       system = pkgs.stdenv.hostPlatform.system;
       expected = comparisonIdentity library;
+      expectedMetadata = inspect library;
       expectedSource = builtins.unsafeDiscardStringContext (toString library.src);
       yarn = comparisonIdentity library.yarn-freestanding;
     }
   );
-  closure = pkgs.closureInfo {
-    rootPaths = [
-      pkgs.path
-      productionDerivation
-    ];
-  };
+  closure = pkgs.closureInfo { rootPaths = [ pkgs.path ]; };
 in
 pkgs.runCommand "quixos-protocol-source-check"
   {