Comment 4 for bug 1666320

I wonder how "chksum_type" is determined?

root@swift-test-02:~# cat audit_frag.py
#!/usr/bin/env python
import sys
from swift.common.storage_policy import POLICIES

policy = POLICIES[2]

with open(sys.argv[1]) as f:
    for frag_data in iter(lambda: f.read(policy.fragment_size), ''):
        print '%r' % policy.pyeclib_driver.get_metadata(frag_data, formatted=True)
root@swift-test-02:~# LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libz.so python audit_frag.py /srv/node/d11/objects-2/398/465/6381800fa3e800cd36d6ea5bf4fd6465/1458349982.69822#3.data
{'index': 3, 'chksum_mismatch': 0, 'backend_id': 'isa_l_rs_vand', 'orig_data_size': 6110L, 'chksum_type': 'none', 'backend_version': 140376711236864, 'chksum': '', 'size': 2037}
root@swift-test-02:~# LD_PRELOAD=/usr/lib/liberasurecode.so.1.4.0 python audit_frag.py /srv/node/d11/objects-2/398/465/6381800fa3e800cd36d6ea5bf4fd6465/1458349982.69822#3.data
{'index': 3, 'chksum_mismatch': 0, 'backend_id': 'isa_l_rs_vand', 'orig_data_size': 6110L, 'chksum_type': 'none', 'backend_version': 139775415815424, 'chksum': '', 'size': 2037}

ubuntu@saio:/vagrant/.scratch$ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libz.so python audit_frag.py /srv/node3/sdb3/objects-1/589/c2b/93464008f434853ad9b74c8c5381ac2b/1498598728.24878#2#d.data
{'index': 2, 'chksum_mismatch': 0, 'backend_id': 'isa_l_rs_vand', 'orig_data_size': 1048576L, 'chksum_type': 'none', 'backend_version': 134400, 'chksum': '', 'size': 524288}
{'index': 2, 'chksum_mismatch': 0, 'backend_id': 'isa_l_rs_vand', 'orig_data_size': 1048576L, 'chksum_type': 'none', 'backend_version': 134400, 'chksum': '', 'size': 524288}
{'index': 2, 'chksum_mismatch': 0, 'backend_id': 'isa_l_rs_vand', 'orig_data_size': 5473L, 'chksum_type': 'none', 'backend_version': 134400, 'chksum': '', 'size': 2737}
ubuntu@saio:/vagrant/.scratch$ LD_PRELOAD=/usr/local/lib/liberasurecode.so.1.4.0 python audit_frag.py /srv/node3/sdb3/objects-1/589/c2b/93464008f434853ad9b74c8c5381ac2b/1498598728.24878#2#d.data
Traceback (most recent call last):
  File "audit_frag.py", line 9, in <module>
    print policy.pyeclib_driver.get_metadata(frag_data, formatted=True)
  File "/vagrant/pyeclib/pyeclib/ec_iface.py", line 335, in get_metadata
    return self.ec_lib_reference.get_metadata(fragment, formatted)
  File "/vagrant/pyeclib/pyeclib/core.py", line 127, in get_metadata
    formatted)
pyeclib.ec_iface.ECInvalidFragmentMetadata: pyeclib_c_get_metadata ERROR: Fragment integrity check failed. Please inspect syslog for liberasurecode error report.