From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id kINAM5NLcl/tRwAA0tVLHw (envelope-from ) for ; Mon, 28 Sep 2020 20:46:11 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id IJr9LpNLcl+dSQAAB5/wlQ (envelope-from ) for ; Mon, 28 Sep 2020 20:46:11 +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 453969404D1 for ; Mon, 28 Sep 2020 20:46:11 +0000 (UTC) Received: from localhost ([::1]:35164 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kN02D-0006Q2-S6 for larch@yhetil.org; Mon, 28 Sep 2020 16:46:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45010) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kN026-0006Ps-MG for bug-guix@gnu.org; Mon, 28 Sep 2020 16:46:02 -0400 Received: from debbugs.gnu.org ([209.51.188.43]:42615) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kN026-00047f-Cf for bug-guix@gnu.org; Mon, 28 Sep 2020 16:46:02 -0400 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1kN026-0004Ag-Be for bug-guix@gnu.org; Mon, 28 Sep 2020 16:46:02 -0400 X-Loop: help-debbugs@gnu.org Subject: bug#43668: Daemon tries to build GNU/Hurd derivations on GNU/Linux Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Mon, 28 Sep 2020 20:46:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 43668 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: Jan Nieuwenhuizen Received: via spool by 43668-submit@debbugs.gnu.org id=B43668.160132593015994 (code B ref 43668); Mon, 28 Sep 2020 20:46:02 +0000 Received: (at 43668) by debbugs.gnu.org; 28 Sep 2020 20:45:30 +0000 Received: from localhost ([127.0.0.1]:54161 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kN01a-00049u-67 for submit@debbugs.gnu.org; Mon, 28 Sep 2020 16:45:30 -0400 Received: from eggs.gnu.org ([209.51.188.92]:38072) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kN01X-00049h-IB for 43668@debbugs.gnu.org; Mon, 28 Sep 2020 16:45:28 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:52409) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kN01Q-0003tk-CR; Mon, 28 Sep 2020 16:45:21 -0400 Received: from [2a01:e0a:1d:7270:af76:b9b:ca24:c465] (port=43864 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kN01P-0004ty-5o; Mon, 28 Sep 2020 16:45:20 -0400 From: Ludovic =?UTF-8?Q?Court=C3=A8s?= References: <87a6xacmw5.fsf@inria.fr> <875z7ychvp.fsf@gnu.org> <87lfgurwaa.fsf@gnu.org> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 7 =?UTF-8?Q?Vend=C3=A9miaire?= 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: Mon, 28 Sep 2020 22:45:17 +0200 In-Reply-To: <87lfgurwaa.fsf@gnu.org> (Jan Nieuwenhuizen's message of "Mon, 28 Sep 2020 13:11:09 +0200") Message-ID: <87r1qlk4v6.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-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-Spam-Score: -3.3 (---) X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 43668@debbugs.gnu.org Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Scanner: scn0 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=pass (policy=none) header.from=gnu.org; spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Spam-Score: -1.51 X-TUID: 9zf1/UYCskXY Hi!< Jan Nieuwenhuizen skribis: >> Ludovic Court=C3=A8s skribis: >> >>> It=E2=80=99s no wonder that the GNU/Hurd executable fails to run on GNU= /Linux. >>> The reason the daemon tries to run it anyway is because of the hack >>> introduced in 7bf2a70a4ffd976d50638d3b9f2ec409763157df, in support of >>> transparent emulation via binfmt_misc. >> >> The thing is that x86 GNU/Hurd and GNU/Linux ELF binaries are >> indistinguishable AFAICS since they both use ELFOSABI_NONE: [...] > Looking at the file sources, it uses do_os_note, look: > > $ readelf -a $(guix build --target=3Di586-pc-gnu hello)bin/hello > > Displaying notes found in: .note.ABI-tag > Owner Data size Description > GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag) > OS: Hurd, ABI: 0.0.0 Oh, well done, I browsed =E2=80=98file=E2=80=99 but didn=E2=80=99t find it. >> So I think we can=E2=80=99t count on an =E2=80=98execve=E2=80=99 error a= nd thus have to treat >> this case (same architecture but different OS kernel) specially, as >> shown below. >> >> Thoughts? > > If that really doesn't work...then yeah (yuck ;-) Yeah, I think we=E2=80=99ll have to do this hack (we=E2=80=99re not going t= o parse ELF files and all to determine whether to call =E2=80=98execve=E2=80=99.) (Besides, it would be interesting to understand how the libc/Hurd startup code ends up segfaulting on GNU/Linux.) Ludo=E2=80=99.