enpass: fix install to work with firefox webextensions

With new Firefox 57 and WebExtensions, the new addon uses Firefox'
Native Messaging mechanism to communicate with local programs (here
the main enpass program). This commit activates EnpassNMHost, a binary
that bootstraps communication between the two.

pkgs/tools/security/enpass/default.nix

@@ -67,12 +67,13 @@ let
       cp -r usr/* $out
       rm $out/bin/runenpass.sh
       cp $out/bin/EnpassHelper/EnpassHelper{,.untampered}
+      cp $out/bin/EnpassHelper/EnpassNMHost{,.untampered}
 
       sed \
       	-i s@/opt/Enpass/bin/runenpass.sh@$out/bin/Enpass@ \
       	$out/share/applications/enpass.desktop
 
-      for i in $out/bin/{Enpass,EnpassHelper/EnpassHelper}; do
+      for i in $out/bin/{Enpass,EnpassHelper/{EnpassHelper,EnpassNMHost}}; do
         patchelf --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) $i
       done
 
@@ -85,8 +86,15 @@ let
         --set QT_XKB_CONFIG_ROOT "${xkeyboardconfig}/share/X11/xkb" \
         --set HIDE_TOOLBAR_LINE 0 \
         --set LD_PRELOAD "${libredirect}/lib/libredirect.so" \
-        --set NIX_REDIRECTS "$out/bin/EnpassHelper/EnpassHelper=$out/bin/EnpassHelper/EnpassHelper.untampered" \
+        --set NIX_REDIRECTS "$out/bin/EnpassHelper/EnpassHelper=$out/bin/EnpassHelper/EnpassHelper.untampered:$out/bin/EnpassHelper/EnpassNMHost=$out/bin/EnpassHelper/EnpassNMHost.untampered" \
         --prefix PATH : ${lsof}/bin
+
+      makeWrapper $out/bin/EnpassHelper/{EnpassNMHost,runNativeMessaging.sh} \
+        --set LD_LIBRARY_PATH "${libPath}:$out/lib:$out/plugins/sqldrivers" \
+        --set QT_PLUGIN_PATH "$out/plugins" \
+        --set QT_QPA_PLATFORM_PLUGIN_PATH "$out/plugins/platforms" \
+        --set QT_XKB_CONFIG_ROOT "${xkeyboardconfig}/share/X11/xkb" \
+        --set HIDE_TOOLBAR_LINE 0
     '';
   };
   updater = {