sublime3: add pkexec and gksudo support

pkgs/applications/editors/sublime3/default.nix

@@ -1,10 +1,15 @@
-{ fetchurl, stdenv, glib, xorg, cairo, gtk, pango, makeWrapper, openssl, bzip2 }:
+{ fetchurl, stdenv, glib, xorg, cairo, gtk, pango, makeWrapper, openssl, bzip2,
+  pkexecPath ? "/var/setuid-wrappers/pkexec", libredirect,
+  gksuSupport ? false, gksu}:
 
 assert stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux";
+assert gksuSupport -> gksu != null;
 
 let
   build = "3083";
   libPath = stdenv.lib.makeLibraryPath [glib xorg.libX11 gtk cairo pango];
+  redirects = [ "/usr/bin/pkexec=${pkexecPath}" ]
+    ++ stdenv.lib.optional gksuSupport "/usr/bin/gksudo=${gksu}/bin/gksudo";
 in let
   # package with just the binaries
   sublime = stdenv.mkDerivation {
@@ -35,6 +40,9 @@ in let
           --set-rpath ${libPath}:${stdenv.cc.cc}/lib${stdenv.lib.optionalString stdenv.is64bit "64"} \
           $i
       done
+
+      # Rewrite pkexec|gksudo argument. Note that we can't delete bytes in binary.
+      sed -i -e 's,/bin/cp\x00,cp\x00\x00\x00\x00\x00\x00,g' sublime_text
     '';
 
     installPhase = ''
@@ -44,6 +52,10 @@ in let
       mkdir -p $out
       cp -prvd * $out/
 
+      wrapProgram $out/sublime_text \
+        --set LD_PRELOAD "${libredirect}/lib/libredirect.so" \
+        --set NIX_REDIRECTS ${builtins.concatStringsSep ":" redirects}
+
       # Without this, plugin_host crashes, even though it has the rpath
       wrapProgram $out/plugin_host --prefix LD_PRELOAD : ${stdenv.cc.cc}/lib${stdenv.lib.optionalString stdenv.is64bit "64"}/libgcc_s.so.1:${openssl}/lib/libssl.so:${bzip2}/lib/libbz2.so
     '';