Added a new config variable that will mail db connection errors to someone (eg admin)

config-dist.php

@@ -274,6 +274,12 @@ $CFG->admin = 'admin';
 // If you are going to publish your log, or the output of your web stats analyzer
 // this will weaken the security of your website.
 // 
+// Email database connection errors to someone.  If Moodle cannot connect to the 
+// database, then email this address with a notice.
+//
+//     $CFG->emailconnectionerrors = your@emailaddress.com;
+// 
+// 
 // NOTE: if you are using custompix in your theme, see /fixpix.php.
 
 //=========================================================================

lib/setup.php

@@ -140,6 +140,12 @@ global $HTTPSPAGEREQUIRED;
         echo '<p>The site administrator should also check that the database details have been correctly specified in config.php</p>';
         echo '</td></tr></table>';
         echo '</body></html>';
+
+        if (!empty($CFG->emailconnectionerrorsto)) {
+            mail($CFG->emailconnectionerrorsto, 
+                 'WARNING: Database connection error: '.$CFG->wwwroot, 
+                 'Connection error: '.$CFG->wwwroot);
+        }
         die;
     }