code: public static function supports(IOInterface $io, Config $config, $url, $deep = false)
      {
          $url = self::normalizeUrl($url);
          if (preg_match('#(^svn://|^svn\+ssh://|svn\.)#i', $url)) {
              return true;
          }
  
          // proceed with deep check for local urls since they are fast to process
          if (!$deep && !Filesystem::isLocalPath($url)) {
              return false;
          }
  
          $processExecutor = new ProcessExecutor($io);
  
          $exit = $processExecutor->execute(
              "svn info --non-interactive ".ProcessExecutor::escape($url),
              $ignoredOutput
          );
  
          if ($exit === 0) {
              // This is definitely a Subversion repository.
              return true;
          }
  
          // Subversion client 1.7 and older
          if (false !== stripos($processExecutor->getErrorOutput(), 'authorization failed:')) {
              // This is likely a remote Subversion repository that requires
              // authentication. We will handle actual authentication later.
              return true;
          }
  
          // Subversion client 1.8 and newer
          if (false !== stripos($processExecutor->getErrorOutput(), 'Authentication failed')) {
              // This is likely a remote Subversion or newer repository that requires
              // authentication. We will handle actual authentication later.
              return true;
          }
  
          return false;
      }
docs: {@inheritDoc}