def scan_default_sr(session):
    sr_ref = safe_find_sr(session)
    _scan_sr(session, sr_ref)
    return sr_ref
Adds a statement to a topic's access control policy, granting
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/virt/xenapi/vm_utils.py/scan_default_sr--crossover with--dataset/ETHPy150Open darcyliu/storyboard/boto/sns/connection.py/SNSConnection.add_permission