firefox: support for native messaging hosts in wrapper

pkgs/applications/networking/browsers/firefox/env_var_for_system_dir.patch

@@ -0,0 +1,14 @@
+diff --git a/toolkit/xre/nsXREDirProvider.cpp b/toolkit/xre/nsXREDirProvider.cpp
+index 380c1c1..255539f 100644
+--- a/toolkit/xre/nsXREDirProvider.cpp
++++ b/toolkit/xre/nsXREDirProvider.cpp
+@@ -306,7 +306,8 @@ GetSystemParentDirectory(nsIFile** aFile)
+                            "/usr/lib/mozilla"
+ #endif
+                            );
+-  rv = NS_NewNativeLocalFile(dirname, false, getter_AddRefs(localDir));
++  const char* pathVar = PR_GetEnv("MOZ_SYSTEM_DIR");
++  rv = NS_NewNativeLocalFile((pathVar && *pathVar) ? nsDependentCString(pathVar) : reinterpret_cast<const nsCString&>(dirname), false, getter_AddRefs(localDir));
+ #endif
+ 
+   if (NS_SUCCEEDED(rv)) {

pkgs/applications/networking/browsers/firefox/packages.nix

@@ -13,7 +13,7 @@ rec {
     };
 
     patches =
-      [ ./no-buildconfig.patch ]
+      [ ./no-buildconfig.patch ./env_var_for_system_dir.patch ]
       ++ lib.optional stdenv.isi686 (fetchpatch {
         url = "https://hg.mozilla.org/mozilla-central/raw-rev/15517c5a5d37";
         sha256 = "1ba487p3hk4w2w7qqfxgv1y57vp86b8g3xhav2j20qd3j3phbbn7";
@@ -38,6 +38,9 @@ rec {
       sha512 = "d80c7219548391d8a47b6e404662ea41e6acfa264a67d69365e76dd8943077e388ab24b030850919f8fc6681c11486bdbaaf170d441c861f4a12cedbe08955ab";
     };
 
+    patches =
+      [ ./env_var_for_system_dir.patch ];
+
     meta = firefox.meta // {
       description = "A web browser built from Firefox Extended Support Release source tree";
     };
@@ -128,6 +131,9 @@ in rec {
       rev   = "tor-browser-52.3.0esr-7.0-1-slnos";
       sha256 = "0szbf8gjbl4dnrb4igy4mq5858i1y6ki4skhdw63iqqdd8w9v4yv";
     };
+
+    patches =
+      [ ./env_var_for_system_dir.patch ];
   } // commonAttrs) {};
 
   tor-browser = tor-browser-7-0;

pkgs/applications/networking/browsers/firefox/wrapper.nix

@@ -1,4 +1,4 @@
-{ stdenv, lib, makeDesktopItem, makeWrapper, config
+{ stdenv, lib, makeDesktopItem, makeWrapper, lndir, config
 
 ## various stuff that can be plugged in
 , flashplayer, hal-flash
@@ -47,6 +47,9 @@ let
       ++ lib.optional (cfg.enableEsteid or false) esteidfirefoxplugin
       ++ lib.optional (cfg.enableVLC or false) vlc_npapi
      );
+  nativeMessagingHosts =
+     ([ ]
+     );
   libs = (if ffmpegSupport then [ ffmpeg ] else with gst_all; [ gstreamer gst-plugins-base ])
          ++ lib.optional gssSupport kerberos
          ++ lib.optionals (cfg.enableQuakeLive or false)
@@ -98,6 +101,7 @@ in stdenv.mkDerivation {
         --prefix-contents PATH ':' "$(filterExisting $(addSuffix /extra-bin-path $plugins))" \
         --suffix PATH ':' "$out/bin" \
         --set MOZ_APP_LAUNCHER "${browserName}${nameSuffix}" \
+        --set MOZ_SYSTEM_DIR "$out/lib/mozilla" \
         ${lib.optionalString (!ffmpegSupport)
             ''--prefix GST_PLUGIN_SYSTEM_PATH : "$GST_PLUGIN_SYSTEM_PATH"''
         + lib.optionalString (browser ? gtk3)
@@ -117,6 +121,11 @@ in stdenv.mkDerivation {
 
     install -D -t $out/share/applications $desktopItem/share/applications/*
 
+    mkdir -p $out/lib/mozilla
+    for ext in ${toString nativeMessagingHosts}; do
+        ${lndir}/bin/lndir -silent $ext/lib/mozilla $out/lib/mozilla
+    done
+
     # For manpages, in case the program supplies them
     mkdir -p $out/nix-support
     echo ${browser} > $out/nix-support/propagated-user-env-packages