expose update available method.

indra/viewer_components/updater/llupdaterservice.cpp

@@ -504,6 +504,11 @@ std::string const & LLUpdaterService::pumpName(void)
 	return name;
 }
 
+bool LLUpdaterService::updateReadyToInstall(void)
+{
+	return LLFile::isfile(update_marker_path());
+}
+
 LLUpdaterService::LLUpdaterService()
 {
 	if(gUpdater.expired())

indra/viewer_components/updater/llupdaterservice.h

@@ -43,6 +43,9 @@ public:
 	// Name of the event pump through which update events will be delivered.
 	static std::string const & pumpName(void);
 	
+	// Returns true if an update has been completely downloaded and is now ready to install.
+	static bool updateReadyToInstall(void);
+	
 	// Type codes for events posted by this service.  Stored the event's 'type' element.
 	enum eUpdaterEvent {
 		INVALID,