nixos/vms: Extract vfio-pci-bind to separate package

pkgs/default.nix

@@ -5,4 +5,5 @@ in
 {
   # yeah turns out this is in nixpkgs now... we'll leave it as a sample i guess lol
   monocraft' = callPackage ./monocraft.nix { };
-}
+  vfio-pci-bind = callPackage ./vfio-pci-bind.nix { };
+}

pkgs/vfio-pci-bind.nix

@@ -0,0 +1,22 @@
+{ stdenv, kmod, ... }:
+stdenv.mkDerivation rec {
+  pname = "vfio-pci-bind";
+  version = "b41e4545b21de434fc51a34a9bf1d72e3ac66cc8";
+
+  src = fetchGit {
+    url = "https://github.com/andre-richter/vfio-pci-bind";
+    rev = version;
+  };
+
+  prePatch = ''
+    substituteInPlace vfio-pci-bind.sh \
+      --replace modprobe ${kmod}/bin/modprobe
+    substituteInPlace 25-vfio-pci-bind.rules \
+      --replace vfio-pci-bind.sh "$out"/bin/vfio-pci-bind.sh
+  '';
+  installPhase = ''
+    mkdir -p "$out"/bin/ "$out"/lib/udev/rules.d
+    cp vfio-pci-bind.sh "$out"/bin/
+    cp 25-vfio-pci-bind.rules "$out"/lib/udev/rules.d/
+  '';
+}