Re: [Duplicity-talk] How to register a new backend (Pyrax for Rackspace Cloud)

[Miguel Jacq]

Hi,

Nevermind, some -v9 debugging showed me that the pyraxbackend was failing to be 
loaded due:

Import of duplicity.backends.pyraxbackend Failed: cannot import name retry

It looks like my version of Duplicity is just too old (lacks this 'retry' logic 
entirely) and thus the Pyrax support patch is (quite reasonably) written for 
newer versions.

For now I have commented out the 'retry' logic in that backend and seemed to 
get it working, but suspect this solution may not work properly as intended, 
perhaps in 'failure to upload' events.

Thanks anyway,

Cheers

Mig


On 30/09/2013, at 9:39 AM, Miguel Jacq wrote:

> Hi,
> 
> I am trying to register the Pyrax (new, supported Rackspace Cloud API) 
> backend with Duplicity in favour of the deprecated 'python-cloudfiles' API 
> which provides the cf+http:// backend.
> 
> 
> I followed the guide described here: 
> http://gsusmonzon.blogspot.com.au/2013/07/backup-with-duplicity-and-rackspace.html
> 
> In particular, I can confirm I have:
> 
> 1) fetched the pyraxbackend.py from 
> https://bugs.launchpad.net/duplicity/+bug/1179322
> 2) stored it in /usr/share/pyshared/duplicity/backends/
> 3) symlinked it to 
> /usr/lib/python2.6/dist-packages/duplicity/backends/pyraxbackend.py
> 4) ran python -m compileall 
> /usr/lib/python2.6/dist-packages/duplicity/backends
> 
> 
> I see that pyraxbackend.py includes this line: 
> 
>       duplicity.backend.register_backend("cfpyrax+http", PyraxBackend)
> 
> 
> Yet when I run my duplicity command, I receive this:
> 
> UnsupportedBackendScheme: scheme not supported in url: 
> cfpyrax+http://backup_XXXXXX
> 
> Is there a missing step I need to perform to register this backend?
> 
> 
> I am running Debian 6 (still), on the rather old Duplicity 0.6.08b. I can 
> consider upgrading (I need to anyway) but wondering if I'll face the same 
> problem, in that there's a missing step to register a backend?
> 
> Thanks in advance,
> 
> Mig
> 
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