installing different versions of the same module

installing different versions of the same module

[Tim Chadburn]

Is it possible to have multiple different versions of the same module installed at the same time? Having read the documentation and inspected existing installed modules, the answer would appear to be "no", but I thought I'd better make sure. 

-- 
Tim Chadburn

Re: installing different versions of the same module

[Mike Gran]

On Saturday, May 6, 2017 2:00 PM, Tim Chadburn <tim@orbitalwintersong.org.uk> wrote:


>Is it possible to have multiple different versions of the same module installed >at the same time? Having read the documentation and inspected existing >installed modules, the answer would appear to be "no", but I thought I'd better >make sure. 


The simple answer is no.

But, you can install the different versions
in different paths and then change environment variables like
GUILE_LOAD_PATH to make sure you are picking the one that you want.

Of course, you can make it work if you really want to by
more drastic means that probably require that you load
the files at run-time or that you modify the modules to have
different 'define-module' declarations

Re: installing different versions of the same module

[Amirouche]

Le 07/05/2017 à 05:08, Mike Gran a écrit :
> On Saturday, May 6, 2017 2:00 PM, Tim Chadburn <tim@orbitalwintersong.org.uk> wrote:
>
>
>> Is it possible to have multiple different versions of the same module installed >at the same time? Having read the documentation and inspected existing >installed modules, the answer would appear to be "no", but I thought I'd better >make sure.
>
> The simple answer is no.
>
> But, you can install the different versions
> in different paths and then change environment variables like
> GUILE_LOAD_PATH to make sure you are picking the one that you want.
>
> Of course, you can make it work if you really want to by
> more drastic means that probably require that you load
> the files at run-time or that you modify the modules to have
> different 'define-module' declarations
>
Also it's possible to do in guix

Re: installing different versions of the same module

[Amirouche]

Le 07/05/2017 à 12:55, Amirouche a écrit :
>
>
> Le 07/05/2017 à 05:08, Mike Gran a écrit :
>> On Saturday, May 6, 2017 2:00 PM, Tim Chadburn 
>> <tim@orbitalwintersong.org.uk> wrote:
>>
>>
>>> Is it possible to have multiple different versions of the same 
>>> module installed >at the same time? Having read the documentation 
>>> and inspected existing >installed modules, the answer would appear 
>>> to be "no", but I thought I'd better >make sure.
>>
>> The simple answer is no.
>>
>> But, you can install the different versions
>> in different paths and then change environment variables like
>> GUILE_LOAD_PATH to make sure you are picking the one that you want.
>>
>> Of course, you can make it work if you really want to by
>> more drastic means that probably require that you load
>> the files at run-time or that you modify the modules to have
>> different 'define-module' declarations
>>
> Also it's possible to do in guix

I  have no example at hand. You can set up environments using guix which 
will automatically setup the environment variables for you where you 
have a given version of dependency while your regular GUILE_LOAD_PATH 
has another version of the same lib or not at all.

That is what guix-tox afaiu for python deps.