nix: strip ghc dependencies from output

1 files changed, 12 insertions, 1 deletions

diff --git a/default.nix b/default.nix
index 73021ff..a8c75d8 100644
--- a/default.nix
+++ b/default.nix
@@ -53,4 +53,15 @@ let
 
   drv = variant (haskellPackages.callPackage f {});
 
-in drv
+  # this removes the /lib directory from the built derivation, which depends on ghc.
+  # this dramatically reduces closure size
+  stripLib = drv: pkgs.stdenv.mkDerivation {
+    name = drv.name + "-without-lib";
+    src = drv.outPath;
+    buildPhase = ''
+      mkdir -p $out
+      cp -r $src/bin $out
+    '';
+    phases = [ "buildPhase" ];
+  };
+in stripLib drv