[bug#46866] [PATCH] gnu: b4: Fix setup.py version incompatibility.

[Kyle Meyer <kyle@kyleam.com>]

Efraim Flashner writes:

> Indeed, it does fail at startup. Two things about your patch, you've
> added a patch file but didn't register it in gnu/local.mk. This means
> it'll get dropped during a 'make dist' which would be a problem.

Doh, thanks for catching that.

> The second is that it's a lot of patch for a small amount of code
> change.

I like that a patch fails loudly once it's no longer valid, but I'm
happy to defer to your opinion that it's an overkill here (and will try
to recalibrate for future patches).

> With your permission I'd like to commit the attached patch instead.
[...]
> From: Kyle Meyer <kyle@kyleam.com>
> Date: Tue, 9 Mar 2021 10:06:13 +0200
> Subject: [PATCH] gnu: b4: Fix setup.py version incompatibility.
>
> * gnu/packages/version-control.scm (b4)[source]: Add snippet to not
> require too specific of a version.
>
> Co-authored with Efraim Flashner <efraim@flashner.co.il>
>
> Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

Sounds fine to me.  I have a slight preference that you put yourself as
the author and put a

  Noticed-by: Kyle Meyer <kyle@kyleam.com>

or

  Reported-by: Kyle Meyer <kyle@kyleam.com>

trailer for me, but either way is okay.

> @@ -2347,7 +2347,15 @@ based on a manifest file published by servers.")
>         (method url-fetch)
>         (uri (pypi-uri "b4" version))
>         (sha256
> -        (base32 "1j904dy9cwxl85k2ngc498q5cdnqwsmw3jibjr1m55w8aqdck68z"))))
> +        (base32 "1j904dy9cwxl85k2ngc498q5cdnqwsmw3jibjr1m55w8aqdck68z"))
> +       (modules '((guix build utils)))
> +       (snippet
> +        '(begin
> +           ;; Fixes issue with dependency requirements being too strict. See upstream commit:
> +           ;; https://git.kernel.org/pub/scm/utils/b4/b4.git/commit/?id=31348a14afdb1d39e7faf9576eaddea1ced76e19
> +           (substitute* "setup.py"
> +             (("\\.0'") "'"))

Just a note: This won't catch a similar problem if dkimpy (1.0.5) is
upgraded before b4, though perhaps that's unlikely and not worth
worrying about.

Thank you for the review.