bug #22570 Fixes twig bundle project root dir discovery (Pierre Rineau)

This PR was squashed before being merged into the 3.3-dev branch (closes #22570).

Discussion
----------

Fixes twig bundle project root dir discovery

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #22149
| License       | MIT
| Doc PR        | none

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TwigBundle ExtensionPass uses a directory lookup algorithm to find the composer.json file. When working under open_basedir restrictions, if the project root folder is not allowed PHP runtime to read, the composer.json will never be found, throwing PHP notices along the way and ending up using the filesystem root instead.

Since that 3.3 introduced the kernel getProjectRoot() method and kernel.project_dir variable, the TwigBundle can now leverage it, in order to get more consistent, and allow site builders to override the getProjectRoot() kernel method, hence bypass the open_basedir restrictions in reliable and safe way.

Commits
-------

3cb2e5b7dd Fixes twig bundle project root dir discovery

src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/ExtensionPass.php

@@ -80,16 +80,13 @@ class ExtensionPass implements CompilerPassInterface
             $container->getDefinition('twig.extension.debug')->addTag('twig.extension');
         }
 
-        $composerRootDir = $this->getComposerRootDir($container->getParameter('kernel.root_dir'));
         $twigLoader = $container->getDefinition('twig.loader.native_filesystem');
         if ($container->has('templating')) {
             $loader = $container->getDefinition('twig.loader.filesystem');
             $loader->setMethodCalls(array_merge($twigLoader->getMethodCalls(), $loader->getMethodCalls()));
-            $loader->replaceArgument(2, $composerRootDir);
 
             $twigLoader->clearTag('twig.loader');
         } else {
-            $twigLoader->replaceArgument(1, $composerRootDir);
             $container->setAlias('twig.loader.filesystem', new Alias('twig.loader.native_filesystem', false));
         }
 
@@ -109,18 +106,4 @@ class ExtensionPass implements CompilerPassInterface
             $container->getDefinition('twig.extension.expression')->addTag('twig.extension');
         }
     }
-
-    private function getComposerRootDir($rootDir)
-    {
-        $dir = $rootDir;
-        while (!file_exists($dir.'/composer.json')) {
-            if ($dir === dirname($dir)) {
-                return $rootDir;
-            }
-
-            $dir = dirname($dir);
-        }
-
-        return $dir;
-    }
 }

src/Symfony/Bundle/TwigBundle/Resources/config/templating.xml

@@ -7,7 +7,7 @@
         <service id="twig.loader.filesystem" class="Symfony\Bundle\TwigBundle\Loader\FilesystemLoader" public="false">
             <argument type="service" id="templating.locator" />
             <argument type="service" id="templating.name_parser" />
-            <argument /> <!-- project's root dir -->
+            <argument>%kernel.project_dir%</argument>
             <tag name="twig.loader"/>
         </service>
 

src/Symfony/Bundle/TwigBundle/Resources/config/twig.xml

@@ -48,7 +48,7 @@
 
         <service id="twig.loader.native_filesystem" class="Twig_Loader_Filesystem" public="false">
             <argument type="collection" /> <!-- paths -->
-            <argument /> <!-- project's root dir -->
+            <argument>%kernel.project_dir%</argument>
             <tag name="twig.loader"/>
         </service>
 

src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/TwigExtensionTest.php

@@ -256,6 +256,7 @@ class TwigExtensionTest extends TestCase
         $container = new ContainerBuilder(new ParameterBag(array(
             'kernel.cache_dir' => __DIR__,
             'kernel.root_dir' => __DIR__.'/Fixtures',
+            'kernel.project_dir' => __DIR__,
             'kernel.charset' => 'UTF-8',
             'kernel.debug' => false,
             'kernel.bundles' => array(

src/Symfony/Bundle/TwigBundle/composer.json

@@ -20,7 +20,7 @@
         "symfony/config": "~3.2",
         "symfony/twig-bridge": "^3.2.1",
         "symfony/http-foundation": "~2.8|~3.0",
-        "symfony/http-kernel": "~2.8.16|~3.1.9|^3.2.2",
+        "symfony/http-kernel": "^3.3",
         "twig/twig": "^1.32|^2.2"
     },
     "require-dev": {