[ZODB-Dev] Undo tab gives odd error with mounted db...

[Tim Peters]

[Chris Withers]
> It's seems to be my day for ZODB errors today...
>
> Trying to go to the Undo tab of a Catalog in a mounted ClientStorage
> (which goes to a FileStorage on the storage servers) gives me:
>
> Traceback (innermost last):
>    Module ZPublisher.Publish, line 101, in publish
>    Module ZPublisher.mapply, line 88, in mapply
>    Module ZPublisher.Publish, line 39, in call_object
>    Module Shared.DC.Scripts.Bindings, line 306, in __call__
>    Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
>    Module App.special_dtml, line 175, in _exec
>    Module App.Undo, line 100, in undoable_transactions
>    Module ZEO.ClientStorage, line 1010, in undoInfo
>    Module ZEO.ServerStub, line 142, in undoInfo
>    Module ZEO.zrpc.connection, line 372, in call
> UndoError: Undo error None: Undo is currently disabled for database
> maintenance.
>
> ...all well and good, except I'm not doing any database maintenance.
>
> What does this really mean?

Perhaps it's a bug.  The intent of the code is to prevent undo while a pack
is in progress (see FileStorage.undoLog(); that's where the msg originates).