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

[Andreas Jung]

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For the logs:

the target file existed and was not writeable for the 'plone'
user (only readable) - not sure if this is intentional an issue with the
umask of the system (0002). As workaround I created a money patch
changing the permissions of the target file before actually trying to
write it back.

Andreas

Andreas Jung wrote:
> Could this be related to
> 
> https://bugs.launchpad.net/zodb/+bug/224169
> 
> ?
> 
> Andreas
> 
> Jim Fulton wrote:
>> On Mon, Apr 26, 2010 at 6:34 AM, Andreas Jung <lists at zopyx.com> wrote:
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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
>> No.
> 
>>> and how can this be fixed.
>> I have no idea, and have no idea how to reproduce it.
> 
>> Jim
> 
> 
> 

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