[gnome-maps/wip/mlundblad/override-fallback-service] service: Add environment variable to force default service

[Marcus Lundblad <mlundblad src gnome org>]

commit 2a22c50356969b2005986b1fb30c8e5cb4b44acc
Author: Marcus Lundblad <ml update uu se>
Date:   Tue Jan 19 23:19:45 2021 +0100

    service: Add environment variable to force default service
    
    Add MAPS_DEFAULT_SERVICE to force using the
    fallback default service file instead of downloading
    the service file.

 src/service.js | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/service.js b/src/service.js
index 4d71a99d..e0e2e799 100644
--- a/src/service.js
+++ b/src/service.js
@@ -50,6 +50,9 @@ function getService() {
     if (_service)
         return _service;
 
+    if (GLib.getenv('MAPS_DEFAULT_SERVICE'))
+        return _createDefaultService();
+
     let serviceOverride = GLib.getenv('MAPS_SERVICE');
     if (serviceOverride)
         return _getServiceFromFile(serviceOverride);