MAGETWO-65208: Store checksum for every section of configuration file & change behavior on read-only FS & add sorting of importers

Author: Bohdan Korablov

app/code/Magento/Deploy/Model/DeploymentConfig/ImporterPool.php

@@ -132,7 +132,8 @@ public function getImporters()
                 throw new ConfigurationMismatchException(__(
                     '%1: Instance of %2 is expected, got %3 instead',
                     $section,
-                    ImporterInterface::class, get_class($importerObj)
+                    ImporterInterface::class,
+                    get_class($importerObj)
                 ));
             }
             $result[$section] = $importerObj;