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  // This is called by the QuickSilver deploy hook to convert from
  // a 'lean' repository to a 'fat' repository. This should only be
  // called when using this repository as a custom upstream, and
  // updating it with `terminus composer <site>.<env> update`. This
  // is not used in the GitHub PR workflow.
  public static function prepareForPantheon()
  {
    // Get rid of any .git directories that Composer may have added.
    // n.b. Ideally, there are none of these, as removing them may
    // impair Composer's ability to update them later. However, leaving
    // them in place prevents us from pushing to Pantheon.
    $dirsToDelete = [];
    $finder = new Finder();
    foreach (
      $finder
        ->directories()
        ->in(getcwd())
        ->ignoreDotFiles(false)
        ->ignoreVCS(false)
        ->depth('> 0')
        ->name('.git')
      as $dir) {
      $dirsToDelete[] = $dir;
    }
    $fs = new Filesystem();
    $fs->remove($dirsToDelete);

    // Fix up .gitignore: remove everything above the "::: cut :::" line
    $gitignoreFile = getcwd() . '/.gitignore';
    $gitignoreContents = file_get_contents($gitignoreFile);
    $gitignoreContents = preg_replace('/.*::: cut :::*/s', '', $gitignoreContents);
    file_put_contents($gitignoreFile, $gitignoreContents);
  }