MyBuilder\Conductor\PackageZipper::verifyZip PHP Method

    private function verifyZip($composerFile, $zipPath, $info)
    {
        $zip = new \ZipArchive();
        $zip->open($zipPath);
        $content = $zip->getFromName('Package/composer.json');
        $zip->close();
        if (sha1_file($composerFile) !== sha1($content)) {
            throw new Exception\ChecksumMismatchException('
            Package ' . $info['name'] . '@' . $info['version'] . '
            is already zipped with the given version but
            the zip composer.json checksum does not match the package/composer.json checksum
            maybe you forgot to increment the package/composer.json version?');
        }
    }