Re: Questions regarding substitutes with debug output

[Ricardo Wurmus]

Olivier Dion <olivier.dion@polymtl.ca> writes:

>> Therefore, since your question is rooted from GWL:
>>
>>         I need to specify the package programmatically as a string in
>>         Guile.  More specifically in the process packages field of Guix
>>         Workflow Language.
>>
>> maybe GWL could also accept a symbol instead of a name string.  Well, I
>> have not used GWL since many months and I do not remember but I think it
>> is doable.  Ricardo?
>
> In my case, I prefer to avoid using package object directly.  As
> mentioned in GWL' manual, the version of Guix running GWL and the
> version of Guix used by GWL (the inferior) might not be the same.  Thus,
> it is not okay for reproducibility in the long term.  In my case, I use
> `guix time-machine --channels` as the inferior.

The process itself could specify channels to use for its environment.
Then it would be self-contained and reproducible without having to rely
on time-machine.

-- 
Ricardo