bug #22728 [HttpKernel] Fix kernel.project_dir extensibility (chalasr)

This PR was merged into the 3.3 branch.

Discussion
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[HttpKernel] Fix kernel.project_dir extensibility

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | https://github.com/symfony/symfony/pull/22727
| License       | MIT
| Doc PR        | n/a

Alternative to #22727 that makes use of the existing public api.

Commits
-------

3230fc7e70 Fix kernel.project_dir extensibility

src/Symfony/Component/HttpKernel/Kernel.php

@@ -82,7 +82,6 @@ abstract class Kernel implements KernelInterface, TerminableInterface
         $this->environment = $environment;
         $this->debug = (bool) $debug;
         $this->rootDir = $this->getRootDir();
-        $this->projectDir = $this->getProjectDir();
         $this->name = $this->getName();
 
         if ($this->debug) {
@@ -604,7 +603,7 @@ abstract class Kernel implements KernelInterface, TerminableInterface
         return array_merge(
             array(
                 'kernel.root_dir' => realpath($this->rootDir) ?: $this->rootDir,
-                'kernel.project_dir' => realpath($this->projectDir) ?: $this->projectDir,
+                'kernel.project_dir' => realpath($this->getProjectDir()) ?: $this->getProjectDir(),
                 'kernel.environment' => $this->environment,
                 'kernel.debug' => $this->debug,
                 'kernel.name' => $this->name,

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

@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpKernel\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\BundleInterface;
 use Symfony\Component\HttpKernel\Config\EnvParametersResource;
@@ -761,6 +762,15 @@ EOF;
         unset($_SERVER['SYMFONY__FOO__BAR']);
     }
 
+    public function testProjectDirExtension()
+    {
+        $kernel = new CustomProjectDirKernel('test', true);
+        $kernel->boot();
+
+        $this->assertSame('foo', $kernel->getProjectDir());
+        $this->assertSame('foo', $kernel->getContainer()->getParameter('kernel.project_dir'));
+    }
+
     /**
      * Returns a mock for the BundleInterface.
      *
@@ -857,3 +867,34 @@ class TestKernel implements HttpKernelInterface
     {
     }
 }
+
+class CustomProjectDirKernel extends Kernel
+{
+    private $baseDir;
+
+    public function __construct()
+    {
+        parent::__construct('test', false);
+
+        $this->baseDir = 'foo';
+    }
+
+    public function registerBundles()
+    {
+        return array();
+    }
+
+    public function registerContainerConfiguration(LoaderInterface $loader)
+    {
+    }
+
+    public function getProjectDir()
+    {
+        return $this->baseDir;
+    }
+
+    public function getRootDir()
+    {
+        return __DIR__.'/Fixtures';
+    }
+}