[bug#44736] [Shepherd PATCH] build: Add guix.scm helper file.

["Ludovic Courtès" <ludo@gnu.org>]

Hello!

Efraim Flashner <efraim@flashner.co.il> skribis:

> * build-aux/guix.scm: New file.

Could you (1) add a copyright header, and (2) add this file to
‘EXTRA_DIST’ in ‘Makefile.am’?

> +(define (keep-file? file stat)
> +  (not (any (lambda (my-string)
> +              (string-contains file my-string))
> +            (list ".git" ".dir-locals.el" "build-aux"))))

FWIW, I’m never quite sure what to do here.  In Guile-zstd, I wrote
something that works even from a tarball (not a Git checkout), but it’s
a bit verbose:

  https://notabug.org/guile-zstd/guile-zstd/src/master/guix.scm

> +(define (build-from-git base)
> +  (package
> +    (inherit base)
> +    (version (git-version (package-version base) "HEAD" %git-commit))
> +    (source (local-file %source-dir
> +                        #:recursive? #t
> +                        #:select? keep-file?))

[…]

> +(list (build-from-git (specification->package "shepherd"))
> +      (build-from-git (specification->package "guile2.2-shepherd"))
> +      ;; This version FTBFS due to an import of '(ice-9 threads)' in modules/shepherd.scm
> +      ;(build-from-git (specification->package "guile2.0-shepherd"))
> +      )

Should it be a manifest instead, so that ‘guix build -f’ works?

The downside of returning several packages is that ‘guix environment -l
guix.scm’ won’t work.

Thanks,
Ludo’.