core: improve error message when starting template without instance

diff --git a/src/core/manager.c b/src/core/manager.c
index 14ee68a..e739795 100644 (file)
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -1333,8 +1333,12 @@ int manager_load_unit_prepare(
 
         t = unit_name_to_type(name);
 
-        if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
+        if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
+                if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE))
+                        return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is missing the instance name.", name);
+
                 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
+        }
 
         ret = manager_get_unit(m, name);
         if (ret) {