libs/web: make dispatcher faults more verbose

diff --git a/libs/web/luasrc/dispatcher.lua b/libs/web/luasrc/dispatcher.lua
index 4cbbe58ce0e2a770fe6b16decd9664af26184b2f..8da10812b9557019048568bf5369aeaefd82b43c 100644 (file)
--- a/libs/web/luasrc/dispatcher.lua
+++ b/libs/web/luasrc/dispatcher.lua
@@ -269,7 +269,12 @@ function dispatch(request)
        end
 
        track.dependent = (track.dependent ~= false)
-       assert(not track.dependent or not track.auto, "Access Violation")
+       assert(not track.dependent or not track.auto,
+               "Access Violation\nThe page at '" .. table.concat(request, "/") .. "/' " ..
+               "has no parent node so the access to this location has been denied.\n" ..
+               "This is a software bug, please report this message at " ..
+               "http://luci.subsignal.org/trac/newticket"
+       )
 
        if track.sysauth then
                local sauth = require "luci.sauth"
@@ -386,7 +391,16 @@ function dispatch(request)
                        target(unpack(args))
                end
        else
-               error404()
+               local root = node()
+               if not root or not root.target then
+                       error404("No root node was registered, this usually happens if no module was installed.\n" ..
+                                "Install luci-admin-full and retry. " ..
+                                "If the module is already installed, try removing the /tmp/luci-indexcache file.")
+               else
+                       error404("No page is registered at '" .. table.concat(request, "/") .. "/'.\n" ..
+                                "If this url belongs to an extension, make sure it is properly installed.\n" ..
+                                "If the extension was recently installed, try removing the /tmp/luci-indexcache file.")
+               end
        end
 end