bug symfony#25591 [HttpKernel] fix cleaning legacy containers (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
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[HttpKernel] fix cleaning legacy containers

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

The suffix used to be `.legacyContainer` (length=16) but we forgot to update the length when it was changed to `.legacy` (length=7).

Commits
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324821d [HttpKernel] fix cleaning legacy containers

Author: nicolas-grekas

src/Symfony/Component/HttpKernel/Kernel.php

@@ -662,7 +662,7 @@ protected function initializeContainer()
             $oldContainerDir = dirname($oldContainer->getFileName());
             foreach (glob(dirname($oldContainerDir).'/*.legacy') as $legacyContainer) {
                 if ($oldContainerDir.'.legacy' !== $legacyContainer && @unlink($legacyContainer)) {
-                    (new Filesystem())->remove(substr($legacyContainer, 0, -16));
+                    (new Filesystem())->remove(substr($legacyContainer, 0, -7));
                 }
             }
 

src/Symfony/Component/HttpKernel/Tests/KernelTest.php

@@ -65,6 +65,31 @@ public function testClone()
         $this->assertNull($clone->getContainer());
     }
 
+    public function testInitializeContainerClearsOldContainers()
+    {
+        $fs = new Filesystem();
+        $legacyContainerDir = __DIR__.'/Fixtures/cache/custom/ContainerA123456';
+        $fs->mkdir($legacyContainerDir);
+        touch($legacyContainerDir.'.legacy');
+
+        $kernel = new CustomProjectDirKernel();
+        $kernel->boot();
+
+        $containerDir = __DIR__.'/Fixtures/cache/custom/'.substr(get_class($kernel->getContainer()), 0, 16);
+        $this->assertTrue(unlink(__DIR__.'/Fixtures/cache/custom/FixturesCustomDebugProjectContainer.php.meta'));
+        $this->assertFileExists($containerDir);
+        $this->assertFileNotExists($containerDir.'.legacy');
+
+        $kernel = new CustomProjectDirKernel(function ($container) { $container->register('foo', 'stdClass')->setPublic(true); });
+        $kernel->boot();
+
+        $this->assertFileExists($containerDir);
+        $this->assertFileExists($containerDir.'.legacy');
+
+        $this->assertFileNotExists($legacyContainerDir);
+        $this->assertFileNotExists($legacyContainerDir.'.legacy');
+    }
+
     public function testBootInitializesBundlesAndContainer()
     {
         $kernel = $this->getKernel(array('initializeBundles', 'initializeContainer'));
@@ -1022,7 +1047,7 @@ protected function getHttpKernel()
 
 class PassKernel extends CustomProjectDirKernel implements CompilerPassInterface
 {
-    public function __construct(\Closure $buildContainer = null)
+    public function __construct()
     {
         parent::__construct();
         Kernel::__construct('pass', true);