apple/t2: add tiny-dfr service

apple/t2/pkgs/tiny-dfr.nix

@@ -0,0 +1,51 @@
+{ pkgs, fetchFromGitHub, rustPlatform, ... }:
+
+let
+  repo = fetchFromGitHub {
+      owner = "kekrby";
+      repo = "tiny-dfr";
+      rev = "8a5d413cb1dbe2a25b77a9e7f3cb5b9c88ef3ffb";
+      hash = "sha256-l4D7aePz/CYpkRorrvsgIYrvSzoZl59OGcFGJqqJftk=";
+  };
+
+in
+rustPlatform.buildRustPackage rec {
+  pname = "tiny-dfr";
+  version = repo.rev;
+
+  src = repo;
+
+  cargoLock.lockFile = "${src}/Cargo.lock";
+
+  nativeBuildInputs = with pkgs; [
+    pkg-config
+  ];
+
+  buildInputs = with pkgs; [
+    udev
+    glib
+    pango
+    cairo
+    gdk-pixbuf
+    libxml2
+    libinput
+  ];
+
+  postPatch = ''
+    substituteInPlace src/main.rs --replace "/usr/share/tiny-dfr/" "$out/share/tiny-dfr/"
+  '';
+
+  postInstall = ''
+    mkdir -p $out/etc $out/share
+
+    cp -r etc/udev $out/etc/
+    cp -r share/tiny-dfr $out/share/
+  '';
+
+  meta = with pkgs.lib; {
+    description = "The most basic dynamic function row daemon possible";
+    homepage = "https://github.com/kekrby/tiny-dfr";
+    license = with licenses; [ asl20 bsd3 cc0 isc lgpl21Plus mit mpl20 unicode-dfs-2016 asl20 asl20-llvm mit unlicense ];
+    maintainers = [];
+  };
+}