init - first working version

flake.nix

@@ -2,28 +2,38 @@
   description = "korg flake";
 
   inputs = {
-    nixpkgs.url     = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
-    nixpkgs-spin.url = "github:NixOS/nixpkgs/893c51bda8b7502b43842f137258d0128097d7ea";
   };
 
-  outputs = { self, nixpkgs, flake-utils, nixpkgs-spin, ... } @ inputs:
+  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        pkgs-spin = nixpkgs-spin.legacyPackages.${system};
-      in {
+
+        pkgs-spin = import (builtins.fetchTarball {
+          url = "https://github.com/NixOS/nixpkgs/archive/893c51bda8b7502b43842f137258d0128097d7ea.tar.gz";
+          sha256 = "0wydvj05k9cjx557gvr1am7rzl482zv9ml0p3zamxm1gx7whzja6";
+        }) { inherit system; }; 
+
+        spinPkg = pkgs-spin.spin;
+
+      in
+      {
         packages.default = pkgs.stdenv.mkDerivation {
-          pname   = "korg";
-          src     = ./.;
+          pname = "korg";
+          src = self;
+          installPhase = ''
+            mkdir -p $out/bin
+            echo "placeholder" > $out/bin/korg
+          '';
         };
 
         devShells.default = pkgs.mkShellNoCC rec {
-          buildInputs = with pkgs; [
-            # spin
-            python3
-          ] ++ [
-            pkgs-spin.spin
+          buildInputs = [
+            pkgs.python3  
+            spinPkg      
+            pkgs.python313Packages.pyyaml
           ];
 
           shellHook = ''