Use extra-packages in modules/hackage-project.nix

Author: hamishmack

compiler/ghc/default.nix

@@ -290,6 +290,7 @@ let
           cd hadrian
         '';
       }];
+      cabalProject = builtins.readFile (src + "/hadrian/cabal.project");
       cabalProjectLocal = null;
       cabalProjectFreeze = null;
       src = haskell-nix.haskellLib.cleanSourceWith {

lib/load-cabal-plan.nix

@@ -100,7 +100,9 @@ in {
                     then import (nixFilesDir + "/cabal-files/${p.pkg-name}.nix")
                   else if builtins.pathExists (nixFilesDir + "/.plan.nix/${p.pkg-name}.nix")
                     then import (nixFilesDir + "/.plan.nix/${p.pkg-name}.nix")
-                  else (((hackage.${p.pkg-name}).${p.pkg-version}).revisions).default) (args // { hsPkgs = {}; });
+                  else
+                    # TODO make this an error?
+                    __trace "WARNING no `.nix` file for ${p.pkg-name} in ${nixFilesDir}." {}) (args // { hsPkgs = {}; });
               in pkgs.lib.optionalAttrs (p ? pkg-src-sha256) {
                 sha256 = p.pkg-src-sha256;
               } // pkgs.lib.optionalAttrs (p.pkg-src.type or "" == "source-repo") {