Only allow to specify the common base path

src/engine/engine.cpp

@@ -18,7 +18,6 @@
 
 #include "storage/shared_barriers.hpp"
 #include "util/make_unique.hpp"
-#include "util/routed_options.hpp"
 #include "util/simple_logger.hpp"
 
 #include <boost/assert.hpp>
@@ -136,8 +135,11 @@ Engine::Engine(EngineConfig &config)
     }
     else
     {
-        util::populate_base_path(config.server_paths);
-        query_data_facade = util::make_unique<datafacade::InternalDataFacade>(config.server_paths);
+        if (!config.storage_config.IsValid())
+        {
+            throw util::exception("Invalid file paths given!");
+        }
+        query_data_facade = util::make_unique<datafacade::InternalDataFacade>(config.storage_config);
     }
 
     // Register plugins

src/engine/engine_config.cpp

@@ -0,0 +1,27 @@
+#include "engine/engine_config.hpp"
+
+namespace osrm
+{
+namespace engine
+{
+
+bool EngineConfig::IsValid() const
+{
+    const bool all_path_are_empty =
+        storage_config.ram_index_path.empty() && storage_config.file_index_path.empty() &&
+        storage_config.hsgr_data_path.empty() && storage_config.nodes_data_path.empty() &&
+        storage_config.edges_data_path.empty() && storage_config.core_data_path.empty() &&
+        storage_config.geometries_path.empty() && storage_config.timestamp_path.empty() &&
+        storage_config.datasource_names_path.empty() &&
+        storage_config.datasource_indexes_path.empty() && storage_config.names_data_path.empty();
+
+    const bool limits_valid =
+        (max_locations_distance_table == -1 || max_locations_distance_table > 2) &&
+        (max_locations_map_matching == -1 || max_locations_map_matching > 2) &&
+        (max_locations_trip == -1 || max_locations_trip > 2) &&
+        (max_locations_viaroute == -1 || max_locations_viaroute > 2);
+
+    return ((use_shared_memory && all_path_are_empty) || storage_config.IsValid()) && limits_valid;
+}
+}
+}