Query information about the RPM at `rpm_path`.

def rpm_info(rpm_path):
    """
    Query information about the RPM at `rpm_path`.

    """
    ts = rpm.TransactionSet()
    ts.setVSFlags(rpm._RPMVSF_NOSIGNATURES)
    rpm_info = {}

    rpm_fd = open(rpm_path, 'rb')
    pkg = ts.hdrFromFdno(rpm_fd)
    rpm_info['name'] = pkg['name']
    rpm_info['version'] = pkg['version']
    rpm_info['release'] = pkg['release']
    rpm_info['epoch'] = 0
    rpm_info['arch'] = pkg['arch']
    rpm_info['nvrea'] = tuple((rpm_info['name'], rpm_info['version'], rpm_info['release'], rpm_info['epoch'], rpm_info['arch']))
    rpm_info['cksum'] = hashlib.md5(rpm_path).hexdigest()
    rpm_info['size'] = os.path.getsize(rpm_path)
    rpm_info['package_basename'] = os.path.basename(rpm_path)
    rpm_fd.close()
    return rpm_info