Interceptors fail using Phar archives using internal aliases

[ohader]

Based on

• pull-request Support CLI tools that use phars without a .phar extension #7
• https://www.drupal.org/project/drupal/issues/3026386
• https://www.drupal.org/project/drupal/issues/3026560

Description

Helper::determineBaseFile($path) is only capable of resolving files that are actually available in the system's file system. Since Phar allows to set internal alias names - in order to be used inside of Phar archives only - the real system path cannot be resolved any more.

Alias names either could be defined using

• Phar::setAlias($alias) - persisted to Phar Manifest
• Phar::mapPhar($alias) - only in-memory during runtime and executed in Phar's Stub section

Inside Phar archives Phar::running could be used, but this won't work "outside", e.g. in PharStreamWrapper or interceptors (http://php.net/manual/en/phar.running.php) - thus, not an option here.