From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp0 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id iK+1HDub2F9VdgAA0tVLHw (envelope-from ) for ; Tue, 15 Dec 2020 11:17:15 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp0 with LMTPS id 2J+IGDub2F8MCQAA1q6Kng (envelope-from ) for ; Tue, 15 Dec 2020 11:17:15 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id C440894011C for ; Tue, 15 Dec 2020 11:17:14 +0000 (UTC) Received: from localhost ([::1]:56036 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kp8KP-0002g9-FR for larch@yhetil.org; Tue, 15 Dec 2020 06:17:13 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53976) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kp8KB-0002fi-80 for guix-devel@gnu.org; Tue, 15 Dec 2020 06:16:59 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:49364) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kp8KA-0007Fc-QR; Tue, 15 Dec 2020 06:16:58 -0500 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=44606 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kp8K9-00081X-CL; Tue, 15 Dec 2020 06:16:58 -0500 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= To: zimoun Subject: Re: Finding versions of packages References: <5ebe44900cb13f637d87309f4567624d16d3ca15@hey.com> <87pn3cu0yf.fsf@gnu.org> <86im94o8z9.fsf@gmail.com> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 25 Frimaire an 229 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Tue, 15 Dec 2020 12:16:55 +0100 In-Reply-To: <86im94o8z9.fsf@gmail.com> (zimoun's message of "Mon, 14 Dec 2020 13:41:46 +0100") Message-ID: <878s9znwt4.fsf@gnu.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Development of GNU Guix and the GNU System distribution , Ryan Prior Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Migadu-Flow: FLOW_IN X-Migadu-Spam-Score: -2.81 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Migadu-Queue-Id: C440894011C X-Spam-Score: -2.81 X-Migadu-Scanner: scn0.migadu.com X-TUID: mH8JY/sPd/2W Hi, zimoun skribis: > On Mon, 14 Dec 2020 at 11:38, Ludovic Court=C3=A8s wrote: > >> However, it might give the false idea that users can pick >> package versions independently (as in: I want esbuild X, GCC Y, and Go >> Z), which is not really the case: packages are interrelated. > > Someone tried that on help-guix. The idea was to recreate a Python > environment. It was an extensive use of inferiors: one inferior per > package. We already discussed that when discussing how to recreate a > profile from a /manifest file.=20=20 > > Just to point the manual about inferiors: > > Sometimes you might need to mix packages from the revision of Guix > you=E2=80=99re currently running with packages available in a different r= evision > of Guix. Guix =E2=80=9Cinferiors=E2=80=9D allow you to achieve that by c= omposing > different Guix revisions in arbitrary ways. > > Therefore, I want esbuild X (compiled with GCC A and foo A), GCC Y (compi= led with > foo B) and Go Z (compiled with foo C). It is technically possible, right? It is possible, and it=E2=80=99s nice to have. However, doing such composition on a per-package basis and as the default way of composing packages is inefficient and, more importantly, the resulting compositions may not work. A package written for Python 2 may not work with Python 3, and so on. Ludo=E2=80=99.