initial version

flake.nix

@@ -0,0 +1,46 @@
+{
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "nixpkgs/release-22.05";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    utils,
+  }:
+    utils.lib.eachDefaultSystem (system: let
+      pkgs = (import nixpkgs) {
+        inherit system;
+      };
+      rev = "0fa9170";
+      hash = "sha256-+BkDUfVqqYMAG62OarNPJiNfghvHpOhhMlS5H+SV1dQ=";
+    in rec {
+      # `nix develop`
+      devShell = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [jq patch];
+      };
+
+      extract = pkgs.callPackage ./extract.nix {};
+      createPatch = prefix: driverPackage: rev: hash: driverPackage.overrideAttrs ({
+        version,
+        preFixup ? "",
+        ...
+      }: let
+        inherit (nixpkgs.lib) importJSON traceVal;
+        jsons = extract rev hash;
+        patchList = importJSON "${jsons}/${prefix}patch-list.json";
+        objectList = importJSON "${jsons}/${prefix}object-list.json";
+        object = (traceVal objectList.${version});
+        patch = (traceVal patchList.${version});
+      in {
+        preFixup =
+          preFixup
+          + ''
+            sed -i '${patch}' $out/lib/${object}.${version}
+          '';
+      });
+      patchNvenc = createPatch "";
+      patchFbc = createPatch "fbc-";
+    });
+}