More moving out of overlays

Moved homebrew installer package out of overlays
Removed ITG specific Python packages entirely

pkgs/default.nix

@@ -9,6 +9,7 @@ in
     #iso = top.self.nixosConfigurations.iso.config.system.build.isoImage;
     #iso-beta = self.nixosConfigurations.iso-beta.config.system.build.isoImage;
     aacs = c ./aacs.nix { };
+    brew = c ./homebrew.nix { };
     create_ssl = c ./create_ssl.nix { };
     inject-darwin = c ./inject-darwin.nix { };
     inject = c ./inject.nix { };

pkgs/homebrew.nix

@@ -0,0 +1,48 @@
+{
+  lib,
+  fetchFromGitHub,
+  stdenv,
+  bash,
+  curl,
+  git,
+  ruby,
+  ...
+}:
+
+stdenv.mkDerivation rec {
+  pname = "homebrew-installer";
+  version = "20230531";
+
+  src = fetchFromGitHub {
+    owner = "Homebrew";
+    repo = "install";
+    rev = "716a1d024f32890ef75ea82c18a769abc24e9475";
+    sha256 = "sha256-xhxWWeCJm49bDzmBT2GHSC0CK1SoQArBhfh5sltGY5o=";
+  };
+
+  buildInputs = [
+    bash
+    curl
+    git
+    ruby
+  ];
+
+  installPhase = ''
+    mkdir -p $out/bin/
+    cp ${src}/install.sh $out/bin/install-homebrew.sh
+    cp ${src}/uninstall.sh $out/bin/uninstall-homebrew.sh
+  '';
+
+  meta = with lib; {
+    description = "Runs the homebrew installer";
+    homepage = "https://github.com/Homebrew/";
+    license = licenses.bsd2;
+    platforms = [
+      "aarch64-darwin"
+      "x86_64-darwin"
+      "x86_64-linux"
+      "aarch64-linux"
+    ];
+    maintainers = [ maintainers.greg ];
+  };
+}