Removed ComposerUtility, Stage::getActiveComposer() and Stage::getStageComposer()

Package Manager's ComposerUtility used to rely on parsing internal data structures of Composer. That made a long-term risk. in It also relied on the composer/composer package to make this reasonably maintainable, but that in turn was a blocker for Drupal core inclusion.

ComposerInspector has been introduced as the successor and provides equivalent functionality, but relies solely on calling composer itself — it's a PHP wrapper to facilitate interacting with composer and with it you can:

• list installed packages: getInstalledPackagesList() (composer show)
• validate composer state & project: validate() (composer validate)
• read project & package configuration: getConfig() (composer config)
• read root package info: getRootPackageInfo() (composer show --self)

This also allowed the Package Manager module to remove its (runtime) dependency on the composer/composer package, which was a prerequisite for Drupal core inclusion.

See the myriad of "use ComposerInspector instead of ComposerUtility" child issues of #3316368: Remove our runtime dependency on composer/composer: remove ComposerUtility for examples.

Updating code to stop using Stage::getActiveComposer() and Stage::getStageComposer()

1. Enable autowiring in your *.services.yml file:
2. Make sure your validator or excluder that used either of those methods has a constructor that is a superset of this:
   

     /**
      * Constructs an <MYVALIDATOR> object.
      *
      * @param \Drupal\package_manager\ComposerInspector $composerInspector
      *   The Composer inspector service.
      * @param \Drupal\package_manager\PathLocator $pathLocator
      *   The path locator service.
      */
     public function __construct(
       private ComposerInspector $composerInspector,
       private PathLocator $pathLocator
     ) {}
   

3. Update code like
   

   $event->stage->getActiveComposer()->getInstalledPackages();
   

   to

   $this->composerInspector->getInstalledPackagesList($this->pathLocator->getProjectRoot());
   

4. Update code like
   

   $event->stage->getStageComposer()->getInstalledPackages();
   

   to

   $this->composerInspector->getInstalledPackagesList($event->stage->getStageDirectory())