From d75c69d7a6a20f650f8657c96f307090af848879 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aleix=20Bon=C3=A9?= <aleix.boneribo@bsc.es>
Date: Mon, 6 Oct 2025 16:48:56 +0200
Subject: [PATCH] Add nix-support/private to unfree derivation outputs

---
 overlay.nix | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/overlay.nix b/overlay.nix
index 3b02ae30..05a40774 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -7,6 +7,32 @@ let
   callPackage = final.callPackage;
 
   bscPkgs = {
+
+    # override stdenv to add a sentinel to know if a derivation comes
+    # from unfree sources.
+    stdenv = prev.stdenv // {
+      mkDerivation =
+        args:
+        let
+          originalDrv = prev.stdenv.mkDerivation args;
+          checkLicense = l: if builtins.isAttrs l then !(l.free or true) else false;
+
+          licenses = if builtins.isList args.meta.license then args.meta.license else [ args.meta.license ];
+
+          hasUnfreeLicense =
+            if args ? meta && args.meta ? license then builtins.any checkLicense licenses else false;
+        in
+        if hasUnfreeLicense then
+          originalDrv.overrideAttrs (old: {
+            postInstall = (old.postInstall or "") + ''
+              mkdir -p $out/nix-support
+              touch $out/nix-support/private
+            '';
+          })
+        else
+          originalDrv;
+    };
+
     agenix = prev.callPackage ./pkgs/agenix/default.nix { };
     amd-uprof = prev.callPackage ./pkgs/amd-uprof/default.nix { };
     bench6 = callPackage ./pkgs/bench6/default.nix { };