Add logging and repmgr command sanity checks

config.c

@@ -22,3 +22,31 @@ progname(void)
 {
 	return _progname;
 }
+
+void
+item_list_append(ItemList *item_list, char *error_message)
+{
+	ItemListCell *cell;
+
+	cell = (ItemListCell *) pg_malloc0(sizeof(ItemListCell));
+
+	if (cell == NULL)
+	{
+		//log_err(_("unable to allocate memory; terminating.\n"));
+		exit(ERR_BAD_CONFIG);
+	}
+
+	cell->string = pg_malloc0(MAXLEN);
+	strncpy(cell->string, error_message, MAXLEN);
+
+	if (item_list->tail)
+	{
+		item_list->tail->next = cell;
+	}
+	else
+	{
+		item_list->head = cell;
+	}
+
+	item_list->tail = cell;
+}