Hello,
Le samedi 05 septembre 2020 à 22:40 -0400, Timothy Sample a écrit :
> As I understand it, ‘gexp->derivation’ returns a value in the store
> monad. I’m not sure why ‘guix build’ doesn’t know how to use it
> directly, but you can get at the derivation by wrapping it with
> ‘run-with-store’:
>
> (run-with-store (open-connection)
> (gexp->derivation "the-thing" build-exp))
>
> Don’t forget to use the ‘(guix store)’ module for this.
OK, I think I understand:
"you exit a monad like you exit a building on fire: by running"
So, I cannot simply return a monadic value to guix build. It needs a
real value.
>
> But! There’s a better way!! :)
>
> You can use the “declarative interface”. Just replace
> ‘gexp->derivation’ with ‘computed-file’:
>
> (computed-file "the-thing" build-exp)
>
> Now there’s no need for ‘(guix store)’.
Thank you, that was exactly what I was looking for!
divoplade
