DMARC-Filter:	OpenDMARC Filter v1.4.2 delorie.com 519Iorf63863162
Authentication-Results:	delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com
Authentication-Results:	delorie.com; spf=pass smtp.mailfrom=cygwin.com
DKIM-Filter:	OpenDKIM Filter v2.11.0 delorie.com 519Iorf63863162
Authentication-Results:	delorie.com;
	dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=kZN1B5ut
X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 5FC1D385843F
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1739127052;
	bh=gySqpAq4jmApzyxywuTsSbDN5Qn6t5vfahdXMn/91GI=;
	h=Date:Subject:To:References:In-Reply-To:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:
	From;
	b=kZN1B5utRdwobjkjN55P5blrxRRjp2DFx5AW8k93qRmsT5Pyb8ouqlcSzG3oDdjl5
	k0xEd9c5R8MYs86lqL1fIQVT/tqNIuyPBJmSVITrRjHPYpYsbnNvkGDyKlUvxDs6rc
	z/xf2UR1k/kvdW2XX2R7a/8wl65ooISVTchgbQ64=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.2 sourceware.org 3FC8F3858CDA
ARC-Filter:	OpenARC Filter v1.0.0 sourceware.org 3FC8F3858CDA
ARC-Seal:	i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1739126992; cv=none;
	b=XnK8iPnH6SHMBeml8yASoDcGmBtQDOUYvBgtgn+2R3xkHWsiF0V5N+BerMj514eQBL6O7/bKPh4ncQlpKtR8H0N52OB7cbLEIq9nNKPEcNt5RxkRrE0F08rrAr61Qy9SzLmP6pKhIHiGJol4SbD2D0hMfOa1I3s+qfCYaBrBWHI=
ARC-Message-Signature:	i=1; a=rsa-sha256; d=sourceware.org; s=key;
	t=1739126992; c=relaxed/simple;
	bh=iTjRNZ1K1AfQsuVZGuYY5s1SXOzsCgxrI4uVsCcdOWg=;
	h=Message-ID:Date:MIME-Version:From:Subject:To:DKIM-Signature;
	b=gwE4WlUNoS3wXNUjSAJgF0BDziqB5OnZBvdAz1F27CrehCqXaoSg62JMdGoEms3svvkJbCPMYcNfwud00EFVmF/Nhu8H+W24d1Wb3qwH23yG76I42gyyXLlqOttuYB/8W9+ucLz3LV5scWOyFXZ58V6/0gRgVcBzAn68hve+NEc=
ARC-Authentication-Results:	i=1; server2.sourceware.org
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 3FC8F3858CDA
Message-ID:	<d74e2f7c-79aa-4bd6-b715-f14084f89320@SystematicSW.ab.ca>
Date:	Sun, 9 Feb 2025 11:49:49 -0700
MIME-Version:	1.0
User-Agent:	Mozilla Thunderbird
Subject:	Re: [maintainer] coreutils-9.0-1: "ln -fs" bug
To:	cygwin AT cygwin DOT com
References:	<7a4548d3-b614-4498-8ad5-50080e708bff AT gmail DOT com>
Autocrypt:	addr=Brian DOT Inglis AT SystematicSW DOT ab DOT ca; keydata=
	xjMEXopx8xYJKwYBBAHaRw8BAQdAnCK0qv/xwUCCZQoA9BHRYpstERrspfT0NkUWQVuoePbN
	LkJyaWFuIEluZ2xpcyA8QnJpYW4uSW5nbGlzQFN5c3RlbWF0aWNTdy5hYi5jYT7ClgQTFggA
	PhYhBMM5/lbU970GBS2bZB62lxu92I8YBQJeinHzAhsDBQkJZgGABQsJCAcCBhUKCQgLAgQW
	AgMBAh4BAheAAAoJEB62lxu92I8Y0ioBAI8xrggNxziAVmr+Xm6nnyjoujMqWcq3oEhlYGAO
	WacZAQDFtdDx2koSVSoOmfaOyRTbIWSf9/Cjai29060fsmdsDM44BF6KcfMSCisGAQQBl1UB
	BQEBB0Awv8kHI2PaEgViDqzbnoe8B9KMHoBZLS92HdC7ZPh8HQMBCAfCfgQYFggAJhYhBMM5
	/lbU970GBS2bZB62lxu92I8YBQJeinHzAhsMBQkJZgGAAAoJEB62lxu92I8YZwUBAJw/74rF
	IyaSsGI7ewCdCy88Lce/kdwX7zGwid+f8NZ3AQC/ezTFFi5obXnyMxZJN464nPXiggtT9gN5
	RSyTY8X+AQ==
Organization:	Systematic Software
In-Reply-To:	<7a4548d3-b614-4498-8ad5-50080e708bff@gmail.com>
X-Rspamd-Queue-Id:	7065B20013
X-Rspamd-Server:	rspamout07
X-Stat-Signature:	teiihiciw49ougutmdcqa8bzpozhjigd
X-Session-Marker:	427269616E2E496E676C69734053797374656D6174696353572E61622E6361
X-Session-ID:	U2FsdGVkX19mtZA/34KFE2MpShF9AUGfAmu6Hr+Gpbk=
X-HE-Tag:	1739126990-213251
X-HE-Meta:	U2FsdGVkX19VqQl+WT/ZD6gY0Ia6Cge3QowRdPdFF5co4wzs8L0NOVnTTGEEJ1ZIpEnnIc8Cx6wzoCiplOWwQj0ze0ZHGxpeDCexpBKhI45jbKNVh/Sew3HepNbVJFfjcdqQ6nLeqzvTJBFjNqLat55p0MU4Qt/TfkLqjJlYRq+SdQcwHaXm/0NtbpU8ZQ/kI9IQNKqniTaDksMzy7UW0lftfLZ2dl3x4em54xSHQnzu6xt+uGTZ7PN1uR5IpUfnks9NkytTXs22WfXcsXt2hoxYx1QoB+mO9up6y+6/7/i+E0PHByq1Gqy0LJqK43r2VCK+rlDrnBrNmJO2BqP0P4GIgGCe7AqX
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Brian Inglis <Brian DOT Inglis AT SystematicSW DOT ab DOT ca>
Errors-To:	cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>
X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 519Iorf63863162

On 2025-02-08 22:40, Marco Atzeri via Cygwin wrote:
> Noticed today, not sure it is new nor that is Cygwin specific.
> 
> It can create unrequested circular links, to replicate:
> 
> $ cd /tmp
> $ mkdir dirA
> $ mkdir dirB
> $ cd dirA
> $ ln -fs /tmp/dirB dirB
> $ ls -l
> total 0
> lrwxrwxrwx 1 marco marco 9 Feb  9 06:33 dirB -> /tmp/dirB
> $ cd dirB
> $ ls -l
> total 0
> lrwxrwxrwx 1 marco marco 7 Feb  9 06:25 dirB -> ../dirB
> 
> I built nothing in dirB, but now there is inside a circular link to itself.
> 
> It only happens with "ln -fs" not with "ln -s"

You are forcing the creation and are allowed to do shoot yourself; also a number 
of bugs were introduced with coreutils 9 changing to use f...at() directory 
relative functions, which messed up our patches and forced a reversion.

I have created many of these, so when creating symlinks with ln -s, I now try 
not to use -f, and almost always try to use either -t --target-directory or -T 
--no-target-directory to specify whether a symlink should added into the 
directory, or a link to a file or directory should be created, or replaced with -f.

I am not seeing anything about this in coreutils issues or change logs;
if you can, would you mind checking with coreutils test 9.5;
I am working on 9.6 and will recheck there when usable.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -