From 7aa5bb3c6414ef61cfdecd18178a6d85b392e07f Mon Sep 17 00:00:00 2001
From: Kris Maglione <maglione.k@gmail.com>
Date: Tue, 12 Oct 2010 23:35:08 -0400
Subject: [PATCH] Show a sensible error message when :extupdate is not
 available. Closes issue #79.

--HG--
extra : rebase_source : 912736e0c9146a6eca72285c21db3a195ed94f3a
---
 common/content/dactyl.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 1ea01244..58fa4b83 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1445,6 +1445,8 @@ const Dactyl = Module("dactyl", {
 
         const updateAddons = Class("UpgradeListener", {
             init: function init(addons) {
+                dactyl.assert(!addons.length || addons[0].findUpdates,
+                              "Not available on " + config.host + " " + services.get("runtime").version);
                 this.remaining = addons;
                 this.upgrade = [];
                 dactyl.echomsg("Checking updates for addons: " + addons.map(function (a) a.name).join(", "));