From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: perl-getopt-long version string contains a letter
Date: Wed, 06 Mar 2019 16:56:29 +0100
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References: <875zsywpf5.fsf@elephly.net> <20190304183140.GA5771@macbook41>
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In-Reply-To: <20190304183140.GA5771@macbook41> (Efraim Flashner's message of
	"Mon, 4 Mar 2019 20:31:40 +0200")
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To: Efraim Flashner <efraim@flashner.co.il>
Cc: guix-devel@gnu.org

Hello,

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

> On Mon, Mar 04, 2019 at 05:54:38PM +0100, Ricardo Wurmus wrote:
>> Hi Guix,
>>=20
>> perl-getopt-long has a version string "v2.49.1".  If we change this to
>> "2.49.1", will installed packages not be upgraded?  What can be done in
>> this case?
>>=20
>
> As I've wrapped my head around it, Guix doesn't believe in "upgrades"
> and "downgrades", just in changes in dependencies. So if the version
> string loses the leading "v" I suppose ASCIIbetically v2.49.1 is a
> higher value than 2.49.1,

Indeed:

--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> (version>? "v2.49.1" "2.49.1")
$21 =3D #t
--8<---------------cut here---------------end--------------->8---

Perhaps what could be done is to deprecate the package with =E2=80=9Cv2.49.=
1=E2=80=9D,
like so:

  (define-public x
    (package
      ;; =E2=80=A6
      (version "2.49.1")))

  (define w/wrong-version
    (package
      (inherit x)
      (version "v2.49.1")  ;wrong version string
      (properties `((superseded . ,x)))))

That should cause upgrades from the wrong version to the new one, even
if the new one is not =E2=80=98version>?=E2=80=99.

Thoughts?

Ludo=E2=80=99.