[Samba] samba 4.9.7 - DC online backup error - "uncaught exception - 'TarFile' object has no attribute '__exit__'"

[me at tdiehl.org]

On Fri, 19 Mar 2021, Rowland penny via samba wrote:

> On 18/03/2021 19:27, Carlos Gardel via samba wrote:
>>  Hi,
>>
>>  I've been running two DC:s (DC1 and DC2) in a pure samba AD domain since
>>  2015 on Centos 6. Starting with version 4.1.14 I have upgraded my way to
>>  version 4.9.7. It seems I have now reached the limit for possible upgrades
>>  of these DC:s since it is no longer possible to upgrade to 4.10 on Centos
>>  6.
>>
>>  I'm now preparing to deploy a DC3 on a Centos 8 vm with samba 4.14.0.
>>  Before joining it to the domain I have tried to make an online backup of
>>  the AD on the two existing DC:s following the guide at
>>  https://wiki.samba.org/index.php/Back_up_and_Restoring_a_Samba_AD_DC.
>>
>>  When I run the command (as root) "samba-tool domain backup online
>>  --targetdir=/root/samba-backup/ --server=DC2 -UAdministrator" I get the
>>  following error:
>>
>>  ERROR(<type 'exceptions.AttributeError'>): uncaught exception - 'TarFile'
>>  object has no attribute '__exit__'
>>     File
>>     "/usr/local/samba/lib64/python2.6/site-packages/samba/netcmd/__init__.py",
>>     line 178, in _run
>>       return self.run(*args, **kwargs)
>>     File
>>     "/usr/local/samba/lib64/python2.6/site-packages/samba/netcmd/domain_backup.py",
>>     line 243, in run
>>       backup_online(smb_conn, sysvol_tar, remote_sam.get_domain_sid())
>>     File "/usr/local/samba/lib64/python2.6/site-packages/samba/ntacls.py",
>>     line 502, in backup_online
>>       with tarfile.open(name=dest_tarfile_path, mode='w:gz') as tar:
>>  [root at dc2 samba-backup]#
>>
>>  Does anybody know if this can be fixed? It looks like the problem is
>>  python 2.6?
>>
>>  I would be very grateful for all the help I can get since it would feel
>>  fantastic to be able to perform a backup before I start to join new DC:s
>>  and make changes to the existing setup.
>>
>>  Best regards,
>>  Carlos
>> 
>
> You need python 2.7 at least, not being a Centos user, is it possible to 
> upgrade Python ?

Python 34 and python 35 are available for centos6.  You need either epel or
the RedHat SCL repos enabled. I am not sure what it will take to enable those
repos given that Centos 6 is dead but the packages were for sure available when
Centos 6 was in production.

Regards,

-- 
Tom			me at tdiehl.org