feature #25288 [DI][FrameworkBundle] Add PSR-11 "ContainerBag" to access parameters as-a-service (nicolas-grekas, sroze)

This PR was merged into the 4.1-dev branch.

Discussion
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[DI][FrameworkBundle] Add PSR-11 "ContainerBag" to access parameters as-a-service

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #17160
| License       | MIT
| Doc PR        | -

There is one thing that prevents us from not injecting the container: access to the parameter bag.
This PR fixes this limitation by providing a PSR-11 `ContainerBagInterface` + related implementation, and wiring it as a service that ppl can then also autowire using the new interface as a type hint, or `ParameterBagInterface`.

Needed to complete e.g. #24738

Commits
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561cd7e Add tests on the ContainerBag
0e18d3e [DI][FrameworkBundle] Add PSR-11 "ContainerBag" to access parameters as-a-service

Author: nicolas-grekas

CHANGELOG.md

@@ -4,7 +4,8 @@ CHANGELOG
 4.1.0
 -----
 
- * allowed to pass an optional `LoggerInterface $logger` instance to the `Router`
+ * Allowed to pass an optional `LoggerInterface $logger` instance to the `Router`
+ * Added a new `parameter_bag` service with related autowiring aliases to acces parameters as-a-service
 
 4.0.0
 -----

DependencyInjection/FrameworkExtension.php

@@ -35,6 +35,8 @@
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\DependencyInjection\Exception\LogicException;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Component\DependencyInjection\ParameterBag\ContainerBagInterface;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
@@ -111,6 +113,12 @@ public function load(array $configs, ContainerBuilder $container)
         $loader->load('services.xml');
         $loader->load('fragment_renderer.xml');
 
+        if (!interface_exists(ContainerBagInterface::class)) {
+            $container->removeDefinition('parameter_bag');
+            $container->removeAlias(ContainerBagInterface::class);
+            $container->removeAlias(ParameterBagInterface::class);
+        }
+
         if (class_exists(Application::class)) {
             $loader->load('console.xml');
 

Resources/config/services.xml

@@ -7,6 +7,12 @@
     <services>
         <defaults public="false" />
 
+        <service id="parameter_bag" class="Symfony\Component\DependencyInjection\ParameterBag\ContainerBag">
+            <argument type="service" id="service_container" />
+        </service>
+        <service id="Symfony\Component\DependencyInjection\ParameterBag\ContainerBagInterface" alias="parameter_bag" />
+        <service id="Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface" alias="parameter_bag" />
+
         <service id="event_dispatcher" class="Symfony\Component\EventDispatcher\EventDispatcher" public="true">
             <tag name="container.hot_path" />
         </service>