Nasal security: give a more user-friendly error on self-check fail

https://sourceforge.net/p/flightgear/mailman/message/34701972/

diff --git a/src/Main/util.cxx b/src/Main/util.cxx
index cfc12cb5fa2aeee1c9c9e852f457ed9ce6405066..a661a5212045524a89f75b589f1dcb048e936d2b 100644 (file)
--- a/src/Main/util.cxx
+++ b/src/Main/util.cxx
@@ -149,8 +149,8 @@ void fgInitAllowedPaths()
         fgValidatePath(globals->get_fg_home() + "/aircraft-data/yes..xml",true).empty() ||
         fgValidatePath(globals->get_fg_root() + "/.\\yes.bmp",false).empty()) {
             flightgear::fatalMessageBox("Nasal initialization error",
-                                    "fgInitAllowedPaths() does not work",
-                                    "");
+                                    "The FG_HOME directory must not be inside any of the FG_ROOT, FG_AIRCRAFT or FG_SCENERY directories",
+                                    "(check that you have not accidentally included an extra :, as an empty part means the current directory)");
             exit(-1);
     }
 }