mbpfan: new package

Daemon that uses input from coretemp module and sets the fan speed using
the applesmc module

pkgs/os-specific/linux/mbpfan/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, lib, fetchFromGitHub, gnugrep, kmod }:
+
+stdenv.mkDerivation rec {
+  name = "mbpfan-${version}";
+  version = "1.9.0";
+  src = fetchFromGitHub {
+    owner = "dgraziotin";
+    repo = "mbpfan";
+    rev = "v${version}";
+    sha256 = "15nm1d0a0c0lzxqngrpn2qpsydsmglnn6d20djl7brpsq26j24h9";
+  };
+  patches = [ ./fixes.patch ];
+  postPatch = ''
+    substituteInPlace src/main.c \
+      --replace '@GREP@' '${gnugrep}/bin/grep' \
+      --replace '@LSMOD@' '${kmod}/bin/lsmod'
+  '';
+  installPhase = ''
+    mkdir -p $out/bin $out/etc
+    cp bin/mbpfan $out/bin
+    cp mbpfan.conf $out/etc
+  '';
+  meta = with lib; {
+    description = "Daemon that uses input from coretemp module and sets the fan speed using the applesmc module";
+    homepage = "https://github.com/dgraziotin/mbpfan";
+    license = licenses.gpl3;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ cstrahan ];
+  };
+}