Store properties in database only later after more checks

If osm2pgsql fails during initialization, for instance because the input
file or the style file was not found, it had already initialized the
osm2pgsql_properties table in the database. We now write the properties
table later to reduce the chances that a small error on the command line
destroys an existing database this way.

src/osm2pgsql.cpp

@@ -44,7 +44,7 @@ void show_memory_usage()
     }
 }
 
-file_info run(options_t const &options, properties_t const &properties)
+file_info run(options_t const &options, properties_t *properties)
 {
     auto const files = prepare_input_files(
         options.input_files, options.input_format, options.append);
@@ -57,10 +57,15 @@ file_info run(options_t const &options, properties_t const &properties)
     middle->start();
 
     auto output = output_t::create_output(middle->get_query_instance(),
-                                          thread_pool, options, properties);
+                                          thread_pool, options, *properties);
 
     middle->set_requirements(output->get_requirements());
 
+    if (!options.append) {
+        properties->init_table();
+    }
+    properties->store();
+
     osmdata_t osmdata{middle, output, options};
 
     // Processing: In this phase the input file(s) are read and parsed,
@@ -93,8 +98,8 @@ void check_db(options_t const &options)
     check_schema(options.output_dbschema);
 }
 
-// This is called in "create" mode to store properties into the database.
-void store_properties(properties_t *properties, options_t const &options)
+// This is called in "create" mode to initialize properties.
+void set_up_properties(properties_t *properties, options_t const &options)
 {
     properties->set_bool("attributes", options.extra_attributes);
 
@@ -121,8 +126,6 @@ void store_properties(properties_t *properties, options_t const &options)
             std::filesystem::absolute(std::filesystem::path{options.style})
                 .string());
     }
-
-    properties->store();
 }
 
 void store_data_properties(properties_t *properties, file_info const &finfo)
@@ -139,8 +142,6 @@ void store_data_properties(properties_t *properties, file_info const &finfo)
             properties->set_string("replication_" + s, value);
         }
     }
-
-    properties->store();
 }
 
 void check_updatable(properties_t const &properties)
@@ -348,6 +349,7 @@ int main(int argc, char *argv[])
 
         properties_t properties{options.connection_params,
                                 options.middle_dbschema};
+
         if (options.append) {
             if (!properties.load()) {
                 throw std::runtime_error{
@@ -358,7 +360,7 @@ int main(int argc, char *argv[])
             check_and_update_properties(&properties, &options);
             properties.store();
 
-            auto const finfo = run(options, properties);
+            auto const finfo = run(options, &properties);
 
             if (finfo.last_timestamp.valid()) {
                 auto const current_timestamp =
@@ -369,17 +371,17 @@ int main(int argc, char *argv[])
                      osmium::Timestamp{current_timestamp})) {
                     properties.set_string("current_timestamp",
                                           finfo.last_timestamp.to_iso());
-                    properties.store();
                 }
             }
         } else {
-            properties.init_table();
             set_option_defaults(&options);
-            store_properties(&properties, options);
-            auto const finfo = run(options, properties);
+            set_up_properties(&properties, options);
+            auto const finfo = run(options, &properties);
             store_data_properties(&properties, finfo);
         }
 
+        properties.store();
+
         show_memory_usage();
         log_info("osm2pgsql took {} overall.",
                  util::human_readable_duration(timer_overall.stop()));