[bug#47163] Using package transformations declaratively (was: [bug#47163] [PATCH] refresh: Add '--installed' option.)

[Xinglu Chen]

On Tue, Mar 16 2021, zimoun wrote:

>> I really like package transformations but is there a way to use specify
>> them with Guile so I can use them with `guix home`[1] or in manifests?
>
> There is several ways to have package transformations at the manifest
> level.  One is:
>
> --8<---------------cut here---------------start------------->8---
> (use-modules (guix transformations))
>
> (define transform1
>   (options->transformation
>     '((with-c-toolchain . "hello=gcc-toolchain@8"))))
>
> (packages->manifest
>   (list (transform1 (specification->package "hello"))))
> --8<---------------cut here---------------end--------------->8---

Cool, thanks for the help.