From 801e523c06f828b3ba96813fc8ef3165865c0743 Mon Sep 17 00:00:00 2001
From: Dmitrii <dpoddubny@gmail.com>
Date: Wed, 19 Dec 2018 17:21:29 +0200
Subject: [PATCH] Fix root node deprecation in symfony/config > 4.1 (#54)

---
 DependencyInjection/Configuration.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 0a7c3ae..e7245ed 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -13,8 +13,14 @@ class Configuration implements ConfigurationInterface
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode = $treeBuilder->root('bm_backup_manager');
+        if (method_exists(TreeBuilder::class, 'getRootNode')) {
+            $treeBuilder = new TreeBuilder('bm_backup_manager');
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // BC layer for symfony/config 4.1 and older
+            $treeBuilder = new TreeBuilder();
+            $rootNode = $treeBuilder->root('bm_backup_manager');
+        }
 
         $rootNode
             ->children()