bug#49979: Duplicity BackendException: No module named 'paramiko'

bug#49979: Duplicity BackendException: No module named 'paramiko'

[Cayetano Santos]

Context:

Using guix as a package manager under a foreign up to date 
archlinux distribution.

The output of guix describe --format=channels is

    https://gitlab.com/csantosb/wikidata/-/blob/master/guix-profiles-backup/guix-channels.scm


Problem:

When using duplicity to backup to a sftp server, I get this error 
message

    BackendException: Could not initialize backend: No module 
    named 'paramiko'

I have installed python-paramiko, but this doesn't fixes the 
problem.

bug#49979: Duplicity BackendException: No module named 'paramiko'

[Leo Famulari]

On Tue, Aug 10, 2021 at 12:15:44PM +0200, Cayetano Santos wrote:
> 
> Context:
> 
> Using guix as a package manager under a foreign up to date archlinux
> distribution.
> 
> The output of guix describe --format=channels is
> 
>    https://gitlab.com/csantosb/wikidata/-/blob/master/guix-profiles-backup/guix-channels.scm
> 
> 
> Problem:
> 
> When using duplicity to backup to a sftp server, I get this error message
> 
>    BackendException: Could not initialize backend: No module    named
> 'paramiko'
> 
> I have installed python-paramiko, but this doesn't fixes the problem.

I don't use Duplicity. Can you give instructions to reproduce this?

It's likely that paramiko needs to be added as a dependency of the
duplicity package, but we should test that first.

bug#49979: Duplicity BackendException: No module named 'paramiko'

[Cayetano Santos]

>mer. 11 août 2021 at 00:28, Leo Famulari ...

> On Tue, Aug 10, 2021 at 12:15:44PM +0200, Cayetano Santos wrote:
>>
>> Context:
>>
>> Using guix as a package manager under a foreign up to date 
>> archlinux
>> distribution.
>>
>> The output of guix describe --format=channels is
>>
>>    https://gitlab.com/csantosb/wikidata/-/blob/master/guix-profiles-backup/guix-channels.scm
>>
>>
>> Problem:
>>
>> When using duplicity to backup to a sftp server, I get this 
>> error message
>>
>>    BackendException: Could not initialize backend: No module 
>>    named
>> 'paramiko'
>>
>> I have installed python-paramiko, but this doesn't fixes the 
>> problem.
>
> I don't use Duplicity. Can you give instructions to reproduce 
> this?
>
> It's likely that paramiko needs to be added as a dependency of 
> the
> duplicity package, but we should test that first.

Sure. Just issue a

    guix install duplicity

and then

    duplicity /tmp sftp://dummy_user@sftp.server/dummy_backup

you’ll get a

BackendException: Could not initialize backend: No module named 
'paramiko'

message.

bug#49979: Duplicity BackendException: No module named 'paramiko'

[Leo Famulari]

On Wed, Aug 11, 2021 at 11:49:01AM +0200, Cayetano Santos wrote:
> Sure. Just issue a
> 
>    guix install duplicity
> 
> and then
> 
>    duplicity /tmp sftp://dummy_user@sftp.server/dummy_backup
> 
> you’ll get a
> 
> BackendException: Could not initialize backend: No module named 'paramiko'

> message.

Thanks! I tested by adding python-paramiko to native-inputs [0], changed
the dummy values to something meaningful, and tried your command:

------
$ duplicity /tmp sftp://leo@domain/dummy_backup 
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: none
GnuPG passphrase for decryption: %    
------

I didn't go past that point but it seems to fix the specific bug you
reported. So, I pushed the change:

https://git.savannah.gnu.org/cgit/guix.git/commit/?id=b1c97ff60b8ac8205d878fec3af8d02ffdf601fe

You can do `guix pull --commit=b1c97ff60b8 && guix package --upgrade=duplicity`
to get the new version of the package.

[0] It's unusual for run-time dependencies like paramiko to be a
native-input. Typically, native-inputs are just build-time dependencies.
Maybe there is some room for improvement in our Duplicity package...

https://guix.gnu.org/manual/en/html_node/package-Reference.html

bug#49979: Duplicity BackendException: No module named 'paramiko'

[Cayetano Santos]

>mer. 11 août 2021 at 18:25, Leo Famulari ...

> On Wed, Aug 11, 2021 at 11:49:01AM +0200, Cayetano Santos wrote:
>> Sure. Just issue a
>>
>>    guix install duplicity
>>
>> and then
>>
>>    duplicity /tmp sftp://dummy_user@sftp.server/dummy_backup
>>
>> you’ll get a
>>
>> BackendException: Could not initialize backend: No module named 
>> 'paramiko'
>
>> message.
>
> Thanks! I tested by adding python-paramiko to native-inputs [0], 
> changed
> the dummy values to something meaningful, and tried your 
> command:
>
> ------
> $ duplicity /tmp sftp://leo@domain/dummy_backup
> Local and Remote metadata are synchronized, no sync needed.
> Last full backup date: none
> GnuPG passphrase for decryption: %
> ------
>
> I didn't go past that point but it seems to fix the specific bug 
> you
> reported. So, I pushed the change:
>
> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=b1c97ff60b8ac8205d878fec3af8d02ffdf601fe
>
> You can do `guix pull --commit=b1c97ff60b8 && guix package 
> --upgrade=duplicity`
> to get the new version of the package.
>
> [0] It's unusual for run-time dependencies like paramiko to be a
> native-input. Typically, native-inputs are just build-time 
> dependencies.
> Maybe there is some room for improvement in our Duplicity 
> package...
>
> https://guix.gnu.org/manual/en/html_node/package-Reference.html

Fixed, thanks !