Breaks ZODB after 0.5.0

[enkore]

I noticed today that database packing doesn't seem to work (at least
on Python 3.3)

Minimal example:

from ZODB import FileStorage, DB

storage = FileStorage.FileStorage('/tmp/mystorage.fs') db =
DB(storage) db.pack() db.close()

Expected: No output / db.pack() should succeed, although there is
likely nothing to pack.

Downgrading zodbpickle to 0.5.0 solves this issue (thx Tres Seaver)

[enkore]

Actual output:

% python zodb_pack.py
packing
Traceback (most recent call last):
  File "/usr/lib/python3.3/site-packages/ZODB/DB.py", line 810, in pack
    self.storage.pack(t, self.references)
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/FileStorage.py", line 1121, in pack
    pack_result = self.packer(self, referencesf, stop, gc)
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/FileStorage.py", line 1074, in packer
    opos = p.pack()
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 408, in pack
    self.gc.findReachable()
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 191, in findReachable
    self.findReachableAtPacktime([z64])
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 276, in findReachableAtPacktime
    for oid in self.findrefs(pos):
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 329, in findrefs
    return self.referencesf(self._file.read(dh.plen))
  File "/usr/lib/python3.3/site-packages/ZODB/serialize.py", line 646, in referencesf
    u.noload()
AttributeError: 'Unpickler' object has no attribute 'noload'
Traceback (most recent call last):
  File "zodb_pack.py", line 5, in <module>
    db.pack()
  File "/usr/lib/python3.3/site-packages/ZODB/DB.py", line 810, in pack
    self.storage.pack(t, self.references)
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/FileStorage.py", line 1121, in pack
    pack_result = self.packer(self, referencesf, stop, gc)
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/FileStorage.py", line 1074, in packer
    opos = p.pack()
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 408, in pack
    self.gc.findReachable()
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 191, in findReachable
    self.findReachableAtPacktime([z64])
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 276, in findReachableAtPacktime
    for oid in self.findrefs(pos):
  File "/usr/lib/python3.3/site-packages/ZODB/FileStorage/fspack.py", line 329, in findrefs
    return self.referencesf(self._file.read(dh.plen))
  File "/usr/lib/python3.3/site-packages/ZODB/serialize.py", line 646, in referencesf
    u.noload()
AttributeError: 'Unpickler' object has no attribute 'noload'

[enkore]

Probably related: #6

[tseaver]

I verified that the example works as expected with the trunk. Fix will be included in a forthcoming 0.5.2 release.