Referring to an origin input in a package variant

Referring to an origin input in a package variant

[Jake]

Hello

From [1], the old input style (which is now deprecated) allows us to assign
a string label to an origin.  E.g. if we have an origin called my-input

(define my-input (origin ...))

then the old input style allows us to provide it as an input to a package
and give it a label at the same time, like so:

(define pkg-a
    (package (inputs `(("my-input-label" ,my-input)))))

This label can be useful when defining a package variant.  E.g.

(inputs (modify-inputs (package-inputs pkg-a)
              (delete "my-input-label")))

With the new input style, we write:

(package (inputs (list my-input)))

Does our input still have a label we can refer to in a package variant?  If
the input was a package, we could refer to it by the package's name
string.  But what about for an origin input?

Thanks
Jake

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

Re: Referring to an origin input in a package variant

[Simon Tournier]

Hi,

On dim., 15 sept. 2024 at 12:52, Jake <jforst.mailman@gmail.com> wrote:

> Does our input still have a label we can refer to in a package variant?  If
> the input was a package, we could refer to it by the package's name
> string.  But what about for an origin input?

Yes, the current internal for the new style works with ’package-name’ as
the label.

>          But what about for an origin input?

If there is only one ’origin’ then you can use ’_’ to refer to it.
Since that’s not handy and does not work when there is more than one,
please see patch proposal v2 [1]; still WIP and v3 should come. :-)

Cheers,
simon

1: [bug#73073] [PATCH v2 0/8] Allow origin inside inputs with "new style".
Simon Tournier <zimon.toutoune@gmail.com>
Tue, 10 Sep 2024 03:27:08 +0200
id:cover.1725930587.git.zimon.toutoune@gmail.com
https://issues.guix.gnu.org/73073
https://issues.guix.gnu.org/msgid/cover.1725930587.git.zimon.toutoune@gmail.com
https://yhetil.org/guix/cover.1725930587.git.zimon.toutoune@gmail.com