[Zope-dev] Clarification re: Zope X3.1, 2.8

[Tim Peters]

I'm merging ZODB 3.4 into Zope on a branch.  As Tres noted earlier in
a checkin comment, a test failure results, because at the ZODB sprint
we fleshed out IDataManager and an older Zope3 class claiming to
implement IDataManager no longer does.  Since Zope trunk doesn't "own"
either the IDataManager definition nor the old Zope3 code, it's
unclear how best to proceed:

ERROR: testInterface (zope.app.mail.tests.test_delivery.TestMailDataManager)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Code\Zope\lib\python\zope\app\mail\tests\test_delivery.py",
line 46, in testInterface
    verifyObject(IDataManager, manager)
  File "C:\Code\Zope\lib\python\zope\interface\verify.py", line 93, in
verifyObject
    return _verify(iface, candidate, tentative, vtype='o')
  File "C:\Code\Zope\lib\python\zope\interface\verify.py", line 60, in _verify
    raise BrokenImplementation(iface, n)
BrokenImplementation: An object has failed to implement interface
<InterfaceClass transaction.interfaces.IDataManager>

        The abort_sub attribute was not provided.

An expedient hack would be to castrate ZODB 3.4's IDataManager
definition, back to what it was before the ZODB sprint.  That's
unattractive for obvious reasons (like, e.g., that the old definition
lied about what the interface actually is).

Current Zope3 trunk will have the same problem with ZODB 3.4 in its
MailDataManager class, so that's "the right place" to fix it.  But
then the repaired version also needs to be merged into the "old" Zope3
code Zope trunk is trying to use.  "The old" zope/app/mail/delivery.py
also uses the deprecated get_transaction().  Perhaps current Zope3
trunk's delivery.py could just be slammed into the tag used by (or a
new tag created for) Zope trunk?

get_transaction() is more troublesome than _just_ that, alas:  there
are about 160 instances of it across the stitched-in lib/python/zope,
and Products/Five, code.  This causes lots of new deprecation warnings
when running the tests.  These are easy to repair with 1-2 hours easy
editing work, but again Zope trunk doesn't own the lib/python/zope
code (where almost all of these appear).