Change record status: 
Introduced in branch: 
8.x-2.x.
Introduced in version: 
2.0.1
Description: 

Previously, the path of the staging root (where staging areas are created) was determined solely by \Drupal\package_manager\Stage::getStagingRoot(). This functionality has been moved to \Drupal\package_manager\PathLocator::getStagingRoot(), which means that the config.factory and file_system services must be passed to PathLocator::__construct().

Impacts: 
Module developers