From 5b97751a8f7edd122d13eeea33146b72b4629761 Mon Sep 17 00:00:00 2001
From: Matej Cotman <cotman.matej@gmail.com>
Date: Fri, 25 Jul 2014 12:43:46 +0200
Subject: [PATCH] fix e18 cpufreq module: set setuid to freqset

---
 .../services/x11/desktop-managers/e18.nix        |  7 +++++--
 pkgs/desktops/e18/enlightenment.nix              | 16 +++++++++++++++-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/nixos/modules/services/x11/desktop-managers/e18.nix b/nixos/modules/services/x11/desktop-managers/e18.nix
index e59b7f426837..cb717eea909c 100644
--- a/nixos/modules/services/x11/desktop-managers/e18.nix
+++ b/nixos/modules/services/x11/desktop-managers/e18.nix
@@ -6,6 +6,7 @@ let
 
   xcfg = config.services.xserver;
   cfg = xcfg.desktopManager.e18;
+  e18_enlightenment = pkgs.e18.enlightenment.override { set_freqset_setuid = true; };
 
 in
 
@@ -23,18 +24,20 @@ in
   config = mkIf (xcfg.enable && cfg.enable) {
 
     environment.systemPackages = [
-      pkgs.e18.efl pkgs.e18.evas pkgs.e18.emotion pkgs.e18.elementary pkgs.e18.enlightenment
+      pkgs.e18.efl pkgs.e18.evas pkgs.e18.emotion pkgs.e18.elementary e18_enlightenment
       pkgs.e18.terminology pkgs.e18.econnman
     ];
 
     services.xserver.desktopManager.session = [
     { name = "E18";
       start = ''
-        ${pkgs.e18.enlightenment}/bin/enlightenment_start
+        ${e18_enlightenment}/bin/enlightenment_start
         waitPID=$!
       '';
     }];
 
+    security.setuidPrograms = [ "e18_freqset" ];
+
   };
 
 }
diff --git a/pkgs/desktops/e18/enlightenment.nix b/pkgs/desktops/e18/enlightenment.nix
index fde939c146ae..ab374ad23346 100644
--- a/pkgs/desktops/e18/enlightenment.nix
+++ b/pkgs/desktops/e18/enlightenment.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, e18, xlibs, libffi, pam, alsaLib, luajit }:
+{ stdenv, fetchurl, pkgconfig, e18, xlibs, libffi, pam, alsaLib, luajit, set_freqset_setuid ? false }:
 stdenv.mkDerivation rec {
   name = "enlightenment-${version}";
   version = "0.18.8";
@@ -10,6 +10,20 @@ stdenv.mkDerivation rec {
   preConfigure = ''
     export NIX_CFLAGS_COMPILE="-I${e18.efl}/include/eo-1 -I${e18.efl}/include/ecore-imf-1 -I${e18.efl}/include/ethumb-client-1 -I${e18.efl}/include/ethumb-1 $NIX_CFLAGS_COMPILE"
   '';
+
+  # this is a hack and without this cpufreq module is not working:
+  #   when set_freqset_setuid is true and "e18_freqset" is set in setuidPrograms (this is taken care of in e18 NixOS module),
+  #   then this postInstall does the folowing:
+  #   1. moves the "freqset" binary to "e18_freqset",
+  #   2. linkes "e18_freqset" to enlightenment/bin so that,
+  #   3. setuidPrograms detects it and makes appropriate stuff to /var/setuid-wrappers/e18_freqset,
+  #   4. and finaly, linkes /var/setuid-wrappers/e18_freqset to original destination where enlightenment wants it
+  postInstall = if set_freqset_setuid then ''
+    export CPUFREQ_DIRPATH=`readlink -f $out/lib/enlightenment/modules/cpufreq/linux-gnu-*`;
+    mv $CPUFREQ_DIRPATH/freqset $CPUFREQ_DIRPATH/e18_freqset
+    ln -sv $CPUFREQ_DIRPATH/e18_freqset $out/bin/e18_freqset
+    ln -sv /var/setuid-wrappers/e18_freqset $CPUFREQ_DIRPATH/freqset
+  '' else "";
   meta = {
     description = "The Compositing Window Manager and Desktop Shell";
     homepage = http://enlightenment.org/;