[FrameworkBundle] revert to legacy wiring of the session when circular refs are detected

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/SessionPass.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * @internal to be removed in 6.0
+ */
+class SessionPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if (!$container->hasDefinition('session')) {
+            return;
+        }
+
+        $bags = [
+            'session.flash_bag' => $container->hasDefinition('session.flash_bag') ? $container->getDefinition('session.flash_bag') : null,
+            'session.attribute_bag' => $container->hasDefinition('session.attribute_bag') ? $container->getDefinition('session.attribute_bag') : null,
+        ];
+
+        foreach ($container->getDefinition('session')->getArguments() as $v) {
+            if (!$v instanceof Reference || !isset($bags[$bag = (string) $v]) || !\is_array($factory = $bags[$bag]->getFactory())) {
+                continue;
+            }
+
+            if ([0, 1] !== array_keys($factory) || !$factory[0] instanceof Reference || 'session' !== (string) $factory[0]) {
+                continue;
+            }
+
+            if ('get'.ucfirst(substr($bag, 8, -4)).'Bag' !== $factory[1]) {
+                continue;
+            }
+
+            $bags[$bag]->setFactory(null);
+        }
+    }
+}

src/Symfony/Bundle/FrameworkBundle/FrameworkBundle.php

@@ -22,6 +22,7 @@
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\DataCollectorTranslatorPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\LoggingTranslatorPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\ProfilerPass;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\SessionPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\TemplatingPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\UnusedTagsPass;
 use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\WorkflowGuardListenerPass;
@@ -125,6 +126,7 @@ public function build(ContainerBuilder $container)
         $this->addCompilerPassIfExists($container, FormPass::class);
         $container->addCompilerPass(new WorkflowGuardListenerPass());
         $container->addCompilerPass(new ResettableServicePass());
+        $container->addCompilerPass(new SessionPass());
 
         if ($container->getParameter('kernel.debug')) {
             $container->addCompilerPass(new AddDebugLogProcessorPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, -32);

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Compiler/SessionPassTest.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\SessionPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+class SessionPassTest extends TestCase
+{
+    public function testProcess()
+    {
+        $arguments = [
+            new Reference('session.flash_bag'),
+            new Reference('session.attribute_bag'),
+        ];
+        $container = new ContainerBuilder();
+        $container
+            ->register('session')
+            ->setArguments($arguments);
+        $container
+            ->register('session.flash_bag')
+            ->setFactory([new Reference('session'), 'getFlashBag']);
+        $container
+            ->register('session.attribute_bag')
+            ->setFactory([new Reference('session'), 'getAttributeBag']);
+
+        (new SessionPass())->process($container);
+
+        $this->assertSame($arguments, $container->getDefinition('session')->getArguments());
+        $this->assertNull($container->getDefinition('session.flash_bag')->getFactory());
+        $this->assertNull($container->getDefinition('session.attribute_bag')->getFactory());
+    }
+}