[ZODB-Dev] [ZODB 3.8/Blob] Error in rename_or_copy_blob()

[Andreas Jung]

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Hi there,

a customer site is running Plone 3.3 w/ plone.app.blob.

While creating a 'File' instance we get the following error:

2010-04-26T13:17:07 ERROR Zope.SiteErrorLog 1272277027.360.157502129415
http://www.deisa.eu/test-project/conversions/@@generate/generate
Traceback (innermost last):
  Module ZPublisher.Publish, line 125, in publish
  Module Zope2.App.startup, line 238, in commit
  Module transaction._manager, line 93, in commit
  Module transaction._transaction, line 325, in commit
  Module transaction._transaction, line 432, in _commitResources
  Module ZODB.Connection, line 762, in tpc_finish
  Module ZEO.ClientStorage, line 1088, in tpc_finish
  Module ZEO.ClientStorage, line 1134, in _update_cache
  Module ZODB.blob, line 772, in rename_or_copy_blob
IOError: [Errno 13] Permission denied:
'/home/plone/Plone/zeocluster/var/blobstorage/0x00/0x00/0x00/0x00/0x00/0x07/0x4c/0xf0/0x0385b9291ea836aa.blob'

The Plone processes is running as user 'plone' (nothing related to
setuid/effective-user) and all files and directories are owned by
'plone'. I could even create a new file from the debugger inside
rename_or_copy_blob() inside the
/home/plone/Plone/zeocluster/var/blobstorage/0x00/0x00/0x00/0x00/0x00/0x07/0x4c/0xf0
directory.

The related code in blob.py is:

759 def rename_or_copy_blob(f1, f2, chmod=True):
760     """Try to rename f1 to f2, fallback to copy.
761
762     Under certain conditions a rename might not work, e.g. because
the target
763     directory is on a different partition. In this case we try to
copy the
764     data and remove the old file afterwards.
765
766     """
767     try:
768         os.rename(f1, f2)
769     except OSError:
770         copied("Copied blob file %r to %r.", f1, f2)
771         file1 = open(f1, 'rb')
772         file2 = open(f2, 'wb')
            ^^^^^^^^^^^^^^^^^^^^^^^
773         try:
774             utils.cp(file1, file2)
775         finally:
776             file1.close()
777             file2.close()
778         remove_committed(f1)
779     if chmod:
780         os.chmod(f2, stat.S_IREAD)

Is this a known problem and how can this be fixed.

Andreas
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