fixing: unable to use default instance if it was not the first created

if the first instance created is not the default instance then the next access to the default instance is not possible since:

 * default_auth is set to null in taler-merchant-httpd_private-post-instances:463
 * TMH_lookup_instance will not find default instance in taler-merchant-httpd:1153
 * auth_ok will be always false in line 1385
    - multihashmap_size > 0
    - default_auth == NULL
    - hc->instance == NULL

disabling any instance creation, even default instance until restart
restarting the service will load the default_auth again allowing the
access to the default instance again

1 files changed, 7 insertions, 2 deletions

diff --git a/src/backend/taler-merchant-httpd_private-post-instances.c b/src/backend/taler-merchant-httpd_private-post-instances.c
index 71be2673..0ab7fce6 100644
--- a/src/backend/taler-merchant-httpd_private-post-instances.c
+++ b/src/backend/taler-merchant-httpd_private-post-instances.c
@@ -453,8 +453,13 @@ retry:
     TMH_reload_instances (mi->settings.id);
   }
   GNUNET_JSON_parse_free (spec);
-  GNUNET_free (TMH_default_auth); /* clear it: user just either created default
-                                     instance or it should already be NULL */
+  if (0 == strcmp (is.id,
+                   "default"))
+  {
+    GNUNET_free (TMH_default_auth); /* clear it if the default instance was
+                                       created */
+  }
+
   return TALER_MHD_reply_static (connection,
                                  MHD_HTTP_NO_CONTENT,
                                  NULL,