Remove uf2conv Python propagated input

flake.nix

@@ -86,9 +86,5 @@
       formatter = pkgs.alejandra;
     });
   in
-    # Recursive-merge attrsets to compose the final flake outputs attrset.
-    builtins.foldl' nixpkgs.lib.attrsets.recursiveUpdate {} [
-      no_system_outputs
-      all_system_outputs
-    ];
+    no_system_outputs // all_system_outputs;
 }

pkgs/default.nix

@@ -5,8 +5,7 @@
   pkgs,
   inputs,
   ...
-}:
-rec {
+}: rec {
   ncurses5-fhs = pkgs.callPackage ./ncurses5-fhs.nix {};
   fpga-udev-rules = pkgs.callPackage ./fpga-udev-rules {};
 
@@ -30,8 +29,6 @@ rec {
   veridian = pkgs.callPackage ./veridian/default.nix {inherit sv-lang_6;};
 
   riscv64-gcc = pkgs.pkgsCross.riscv64.buildPackages.gcc;
-}
-// pkgs.lib.optionalAttrs (pkgs.system == "x86_64-linux") {
   lowrisc-toolchain-gcc-rv32imcb = pkgs.callPackage ./lowrisc-toolchain-gcc-rv32imcb.nix {};
   lowrisc-toolchain-gcc-rv64imac = pkgs.callPackage ./lowrisc-toolchain-gcc-rv64imac.nix {};
 }

pkgs/lowrisc-toolchain-gcc-rv32imcb.nix

@@ -31,4 +31,8 @@ stdenv.mkDerivation rec {
       patchelf --set-rpath ${lib.makeLibraryPath ["$out" stdenv.cc.cc ncurses5]} "$f" || true
     done
   '';
+
+  meta = {
+    platforms = ["x86_64-linux"];
+  };
 }

pkgs/lowrisc-toolchain-gcc-rv64imac.nix

@@ -31,4 +31,8 @@ stdenv.mkDerivation rec {
       patchelf --set-rpath ${lib.makeLibraryPath ["$out" stdenv.cc.cc ncurses5]} "$f" || true
     done
   '';
+
+  meta = {
+    platforms = ["x86_64-linux"];
+  };
 }

pkgs/sv-lang.nix

@@ -73,6 +73,7 @@ in
       license = licenses.mit;
       maintainers = with maintainers; [sharzy];
       mainProgram = "slang";
+      broken = stdenv.system == "x86_64-darwin";
       platforms = platforms.all;
     };
   }

pkgs/uf2conv.nix

@@ -4,20 +4,32 @@
 {
   python3Packages,
   fetchFromGitHub,
+  stdenv,
   lib,
-}:
-python3Packages.buildPythonPackage rec {
-  name = "uf2conv";
-  version = "0.0.1";
-  src = fetchFromGitHub {
-    owner = "makerdiary";
-    repo = "uf2utils";
-    rev = "61d9f3ff4913461b9813e666cce62b022652144a";
-    hash = "sha256-3mXOvzkHmTV0k8qoy2k5TGBFX2l9EgPuaZPLyTdBHzQ=";
+}: let
+  app = python3Packages.buildPythonApplication rec {
+    name = "uf2conv";
+    version = "0.0.1";
+    src = fetchFromGitHub {
+      owner = "makerdiary";
+      repo = "uf2utils";
+      rev = "61d9f3ff4913461b9813e666cce62b022652144a";
+      hash = "sha256-3mXOvzkHmTV0k8qoy2k5TGBFX2l9EgPuaZPLyTdBHzQ=";
+    };
+    meta = {
+      description = "uf2conv is an open source Python based tool for packing and unpacking UF2 files.";
+      homepage = "https://github.com/makerdiary/uf2utils";
+      license = lib.licenses.mit;
+    };
   };
-  meta = {
-    description = "uf2conv is an open source Python based tool for packing and unpacking UF2 files.";
-    homepage = "https://github.com/makerdiary/uf2utils";
-    license = lib.licenses.mit;
-  };
-}
+in
+  # `buildPythonApplication` sets `propagatedBuildInputs` which in turn pulls Python into path
+  # when used in `mkShell`. Launder it through custom derivation to remove it.
+  stdenv.mkDerivation {
+    inherit (app) name version meta;
+    dontUnpack = true;
+    installPhase = ''
+      mkdir -p $out/bin
+      ln -s ${app}/bin/uf2conv $out/bin
+    '';
+  }