Platformsh\Cli\Local\LocalProject::getProjectRoot PHP Method

    public function getProjectRoot()
    {
        // Backwards compatibility - if in an old-style project root, change
        // directory to the repository.
        if (is_dir('repository') && file_exists($this->config->get('local.project_config_legacy'))) {
            $cwd = getcwd();
            chdir('repository');
        }
        // The project root is a Git repository, which contains a project
        // configuration file, and/or contains a Git remote with the appropriate
        // domain.
        $dir = $this->findTopDirectoryContaining('.git', function ($dir) {
            $config = $this->getProjectConfig($dir);
            return !empty($config);
        });
        if (isset($cwd)) {
            chdir($cwd);
        }
        return $dir;
    }

 /**
  * @inheritdoc
  */
 protected function initialize(InputInterface $input, OutputInterface $output)
 {
     // Validate we can run.
     if ($this->platformConfig === null) {
         $output->writeln('<error>Must run command within a Platform.sh project</error>');
         exit(1);
     }
     $this->projectPath = LocalProject::getProjectRoot();
     $this->projectName = Platform::projectName();
     $this->stdOut = $output;
     $this->stdErr = $output instanceof ConsoleOutputInterface ? $output->getErrorOutput() : $output;
     $this->stdIn = $input;
     self::$interactive = $input->isInteractive();
 }