bug symfony#12525 [Bundle][FrameworkBundle] be smarter when guessing the document root (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Bundle][FrameworkBundle] be smarter when guessing the document root

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#12524
| License       | MIT
| Doc PR        |

Commits
-------

e28f5b8 be smarter when guessing the document root

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php

@@ -44,7 +44,7 @@ protected function configure()
         $this
             ->setDefinition(array(
                 new InputArgument('address', InputArgument::OPTIONAL, 'Address:port', 'localhost:8000'),
-                new InputOption('docroot', 'd', InputOption::VALUE_REQUIRED, 'Document root', 'web/'),
+                new InputOption('docroot', 'd', InputOption::VALUE_REQUIRED, 'Document root', null),
                 new InputOption('router', 'r', InputOption::VALUE_REQUIRED, 'Path to custom router script'),
             ))
             ->setName('server:run')
@@ -83,6 +83,10 @@ protected function execute(InputInterface $input, OutputInterface $output)
     {
         $documentRoot = $input->getOption('docroot');
 
+        if (null === $documentRoot) {
+            $documentRoot = $this->getContainer()->getParameter('kernel.root_dir').'/../web';
+        }
+
         if (!is_dir($documentRoot)) {
             $output->writeln(sprintf('<error>The given document root directory "%s" does not exist</error>', $documentRoot));