Hi Darren,
On Dec 12, 2011, at 11:29 AM, Darren Dale wrote:
> (Apologies if this gets posted twice)
>
> Someone reported a bug at the h5py issue tracker:
>
> ---
> import h5py
>
> # test setup
> fid = h5py.File('test.hdf5', 'w')
>
> g = fid.create_group('old_loc')
> g2 = g.create_group('group')
> d = g.create_dataset('dataset', data=0)
>
> print "before move:"
> print g2.name
> print d.name
>
> # now rename toplevel group
> g.parent.id.move('old_loc', 'new_loc')
>
> print "after move:"
> # old parent remains in dataset name, group is ok
> print g2.name
> print d.name
>
> # parent is accessed by name 'g' which does not exist any more
> d.parent
>
> fid.close()
> ---
>
> That script produces the following output:
>
> ---
> before move:
> /old_loc/group
> /old_loc/dataset
> after move:
> /new_loc/group
> /old_loc/dataset
> Traceback (most recent call last):
> File "move_error.py", line 24, in <module>
> d.parent
> File
> "/Users/darren/Library/Python/2.7/lib/python/site-packages/h5py/_hl/base.py",
> line 144, in parent
> return self.file[posixpath.dirname(self.name)]
> File
> "/Users/darren/Library/Python/2.7/lib/python/site-packages/h5py/_hl/group.py",
> line 128, in __getitem__
> oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
> File "h5o.pyx", line 176, in h5py.h5o.open (h5py/h5o.c:2814)
> KeyError: "unable to open object (Symbol table: Can't open object)"
> ---
>
> g.name and d.name simply return the result of h5i.get_name.
>
> d.parent just splits d.name at the last "/" and returns the the first
> part of the split.
>
> g.parent.id.move calls H5Gmove2. I've read the warnings about
> corrupting data using H5Gmove at
> http://www.hdfgroup.org/HDF5/doc1.6/Groups.html#H5GUnlinkToCorrupt ,
> but the situation described there does not appear to be relevant to
> the problem we are seeing. Is h5py not performing the move properly,
> or could this be a bug in HDF5?
I think that the move is probably working correctly, but maybe h5py's
name tracking isn't. I would say that g2's name after the move should be
"/new_loc/group", not "/old_loc/group".
Quincey
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