Updated flake

nix-modpack/flake.nix

@@ -2,14 +2,14 @@
   description = "Create nix derivations from a packwiz modpack";
 
   inputs = {
-    nix-minecraft.url = "github:Jan-Bulthuis/nix-minecraft";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
   };
 
   outputs =
-    { nix-minecraft, ... }:
+    { nixpkgs, nix-minecraft, ... }:
     let
       lib = import ./lib {
-        inherit nix-minecraft;
+        inherit nixpkgs nix-minecraft;
       };
     in
     {

nix-modpack/lib/default.nix

@@ -1,20 +1,30 @@
-{ nix-minecraft, ... }:
+{ nixpkgs, ... }:
 
 let
+  lib = nixpkgs.lib;
+
+  eachSystem =
+    fn: lib.genAttrs lib.systems.flakeExposed (system: fn (import nixpkgs { inherit system; }));
+
   mkModpack =
-    { inputs }:
+    builder:
     let
-      nixpkgs = inputs.nixpkgs;
-      lib = nixpkgs.lib;
+      mkPackages =
+        pkgs:
+        let
+          bootstrap = pkgs.fetchurl {
+            url = "https://github.com/packwiz/packwiz-installer-bootstrap/releases/download/v0.0.3/packwiz-installer-bootstrap.jar";
+            sha256 = "qPuyTcYEJ46X9GiOgtPZGjGLmO/AjV2/y8vKtkQ9EWw=";
+          };
 
-      eachSystem =
-        fn: lib.genAttrs lib.systems.flakeExposed (system: fn (import nixpkgs { inherit system; }));
-
-      mkPackages = pkgs: {
-        modpack = nix-minecraft.legacyPackages.${pkgs.system}.fetchPackwizModpack {
-          url = inputs.self;
+          buildInfo = builder pkgs.system;
+        in
+        lib.trace buildInfo {
+          server = pkgs.writeShellScriptBin "minecraft-server" ''
+            ${lib.getExe pkgs.jre} -jar ${bootstrap} -g -s server ${buildInfo.packUrl}
+            # ${buildInfo.server}/bin/minecraft-server
+          '';
         };
-      };
 
       overlay = final: prev: mkPackages prev;
     in