X-Loop: help-debbugs@HIDDEN
Subject: bug#76876: logname output is often wrong when linked with glibc
Resent-From: Nicolas Boos <nicolas.boos@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-coreutils@HIDDEN
Resent-Date: Sat, 08 Mar 2025 23:08:03 +0000
Resent-Message-ID: <handler.76876.B.174147523321237 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
X-GNU-PR-Message: report 76876
X-GNU-PR-Package: coreutils
X-GNU-PR-Keywords:
To: 76876 <at> debbugs.gnu.org
X-Debbugs-Original-To: bug-coreutils@HIDDEN
Received: via spool by submit <at> debbugs.gnu.org id=B.174147523321237
(code B ref -1); Sat, 08 Mar 2025 23:08:03 +0000
Received: (at submit) by debbugs.gnu.org; 8 Mar 2025 23:07:13 +0000
Received: from localhost ([127.0.0.1]:57211 helo=debbugs.gnu.org)
by debbugs.gnu.org with esmtp (Exim 4.84_2)
(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
id 1tr3GC-0005WN-BZ
for submit <at> debbugs.gnu.org; Sat, 08 Mar 2025 18:07:13 -0500
Received: from lists.gnu.org ([2001:470:142::17]:46920)
by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
(Exim 4.84_2) (envelope-from <nicolas.boos@HIDDEN>)
id 1tqxLS-0002k9-8s
for submit <at> debbugs.gnu.org; Sat, 08 Mar 2025 11:48:14 -0500
Received: from eggs.gnu.org ([2001:470:142:3::10])
by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
(Exim 4.90_1) (envelope-from <nicolas.boos@HIDDEN>)
id 1tqxLM-00005H-KY
for bug-coreutils@HIDDEN; Sat, 08 Mar 2025 11:48:08 -0500
Received: from smtp-13.smtpout.orange.fr ([80.12.242.13]
helo=smtp.smtpout.orange.fr)
by eggs.gnu.org with esmtps (TLS1.2:RSA_AES_128_GCM_SHA256:128)
(Exim 4.90_1) (envelope-from <nicolas.boos@HIDDEN>)
id 1tqxLK-00081l-98
for bug-coreutils@HIDDEN; Sat, 08 Mar 2025 11:48:08 -0500
Received: from unknown ([83.113.165.223]) by smtp.orange.fr with ESMTPSA
id qxL8tT9qdgqdOqxLCtNoaR; Sat, 08 Mar 2025 17:47:58 +0100
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wanadoo.fr;
s=t20230301; t=1741452478;
bh=jKq84GpjaN5/xYpH61qdJtOs6ljneegwxSVxRb2QnHc=;
h=Date:From:To:Subject:Message-ID:MIME-Version;
b=qXmVsP5PZKPgKXFvquBfxTUi5J8oLCM7n1bdaFijFaXFWw94nXL02yNLDGk2v6xFI
gXel49JCJfG2K7PhO8GKau2vOZcEYV+zIBz19I2bKdu+U7eRjBAiyP6YiB5MuHhBnk
l7F2sNKjGyBOuUul2WWvQOnyw8EtuHpMBUHtf4oOUNDh5LilxWtEyhDVrtM+7iXzTp
NGnPap/eM/spsn0tVOvEajgEvZ1UNnr+KPDeY5LexNFD+Ae1SS0JwTiWwJ5hnhOqzd
iPqkOPzBTOb1mboZTug8eRU/jvKX1Z226uulRMjFtNpn6T0fCMmL3sinQRs1KqGO1b
kNFwcMHqdDTng==
X-ME-Helo: unknown
X-ME-Auth: bmljb2xhcy5ib29zQHdhbmFkb28uZnI=
X-ME-Date: Sat, 08 Mar 2025 17:47:58 +0100
X-ME-IP: 83.113.165.223
Date: Sat, 8 Mar 2025 17:46:22 +0100
From: Nicolas Boos <nicolas.boos@HIDDEN>
Message-ID: <20250308174622.316f583a@unknown>
X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; x86_64-pc-linux-gnu)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Received-SPF: pass client-ip=80.12.242.13;
envelope-from=nicolas.boos@HIDDEN; helo=smtp.smtpout.orange.fr
X-Spam_score_int: -20
X-Spam_score: -2.1
X-Spam_bar: --
X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,
DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,
RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001,
RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,
SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-Spam-Score: 1.0 (+)
X-Mailman-Approved-At: Sat, 08 Mar 2025 18:07:05 -0500
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>,
<mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>,
<mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: -0.0 (/)
First test case with logname 9.1 and glibc 2.36:
$ echo $LOGNAME
nicolas
$ logname
nicolas
$ su --login root
$ echo $LOGNAME
root
$ logname
nicolas
$ logname (musl)
root
$ logname (uclibc)
root
Second test case, with a minimal chroot, no /proc and busybox login:
$ echo $LOGNAME
nicolas
$ logname
logname: no login name
$ busybox logname
logname: getlogin: No such file or directory
$ logname (musl)
nicolas
$ logname (uclibc)
nicolas
It seems getlogin() is malfunctioning only with glibc.
The following patch with "equivalent code" fixes the issue:
--- logname.c.orig
+++ logname.c
@@ -71,7 +71,11 @@
/* POSIX requires using getlogin (or equivalent code) and prohibits
using a fallback technique. */
- cp = getlogin ();
+ #if __GLIBC__
+ cp = getenv ("LOGNAME");
+ #else
+ cp = getlogin ();
+ #endif
if (! cp)
error (EXIT_FAILURE, 0, _("no login name"));
Adding a permanent fix to gnulib/getlogin.c code might be a better solution.
NB
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Nicolas Boos <nicolas.boos@HIDDEN> Subject: bug#76876: Acknowledgement (logname output is often wrong when linked with glibc) Message-ID: <handler.76876.B.174147523321237.ack <at> debbugs.gnu.org> References: <20250308174622.316f583a@unknown> X-Gnu-PR-Message: ack 76876 X-Gnu-PR-Package: coreutils Reply-To: 76876 <at> debbugs.gnu.org Date: Sat, 08 Mar 2025 23:08:03 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 76876 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 76876: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76876 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.