[OpenAFS] Problem with reading files in python

[Kostas Liakakis]

Hi,

Probably it's the r+b mode you are using... 'r+' means open for read and 
write, placing the file pointer at the start.

Try with 'rb' instead.

-K.

On 27/06/2022 16.21, Stephen Quinney wrote:
> I have a slightly puzzling issue with Python, I am trying to open a
> ISO file that is stored in AFS. in binary mode just for reading.
>
> I have read permission on the directory but not write:
>
> % fs listacl foo
> Access list for foo is
> Normal rights:
>    system:administrators rlidwka
>    squinney rl
>
> If I open the file as normal (i.e. text mode) it works fine but when I
> attempt to use binary mode I get permission denied.
>
> % python3
> Python 3.8.10 (default, Mar 15 2022, 12:22:08)
> [GCC 9.4.0] on linux
> Type "help", "copyright", "credits" or "license" for more information.
>>>> open("foo/example.iso")
> <_io.TextIOWrapper name='foo/example.iso' mode='r' encoding='UTF-8'>
>>>> open("foo/example.iso",mode="r+b")
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> PermissionError: [Errno 13] Permission denied: 'foo/example.iso'
>
> If I copy the directory to a local filesystem it all works as
> expected. What am I missing here?
>
>
> Thanks,
>
> Stephen Quinney
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