X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:to:references:from:message-id:date
	:mime-version:in-reply-to:content-type; q=dns; s=default; b=FDAh
	n5AqXHR5Lx+xN5Gq2GtdlouMTU8WgZHJIRUI7quElyTgWSBVJ12qK8t50hgHqZ3X
	b/d50yasEbPgrdvQs1bWfrMhHoR42cHfF7T/gTxRITwW1Gi0Jy9r8o3HEvTbRtRa
	kkjJtCUkYAi2ncsdX9h6JWLDl1SKvA+eymuYPNk=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:to:references:from:message-id:date
	:mime-version:in-reply-to:content-type; s=default; bh=QzJOzuBYv+
	IX6V2JFiolOQ+vqF4=; b=HkYsBy/e/j2pEgSJk+g9x9Qj3chIFCO0wnaQwwwCUv
	GSm7oIH/EC1nsaEa+D66/jMRFre9Yz7f54SaKPl4UBfRdFq+eX91CvXG5x7g9VqI
	51TlQndE1P/xD29JWCvl+HSnkUd1JHgef+umw75DAw5sfzMAePWCP5UMCsJxtTHE
	I=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-1.6 required=5.0 tests=AWL,BAYES_05,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2
X-HELO:	mail-wm0-f50.google.com
X-Received:	by 10.194.203.106 with SMTP id kp10mr9710770wjc.86.1447959206616; Thu, 19 Nov 2015 10:53:26 -0800 (PST)
Subject:	Re: Symlink targets dereferenced when winsymlinks:native
To:	cygwin AT cygwin DOT com
References:	<564BAA1A DOT 8000703 AT gmail DOT com> <20151118175503 DOT GT6402 AT calimero DOT vinschen DOT de> <564CBFCC DOT 4020605 AT gmail DOT com> <20151118194819 DOT GV6402 AT calimero DOT vinschen DOT de>
From:	David Macek <david DOT macek DOT 0 AT gmail DOT com>
X-Enigmail-Draft-Status:	N1110
Message-ID:	<564E1AA0.6070001@gmail.com>
Date:	Thu, 19 Nov 2015 19:53:20 +0100
User-Agent:	Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0
MIME-Version:	1.0
In-Reply-To:	<20151118194819.GV6402@calimero.vinschen.de>
X-IsSubscribed:	yes
Note-from-DJ:	This may be spam

--------------ms000803000505030104040508
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

On 18. 11. 2015 20:48, Corinna Vinschen wrote:
> On Nov 18 19:13, David Macek wrote:
>> On 18. 11. 2015 18:55, Corinna Vinschen wrote:
>>> On Nov 17 23:28, David Macek wrote:
>>>> I went through the UG looking for differences between regular Cygwin
>>>> symlinks and NTFS symlinks, but couldn't find this documented. It
>>>> seems that when using winsymlinks:native, the target path is first
>>>> dereferenced before storing it in the link.
>>>
>>> It's a result of the native symlink being a Windows path.  The
>>> ultimate conversion from POSIX to Windows path dereferences all
>>> symlinks.

Hmm. I just performed a test on my Cygwin installation and it doesn't seem =
to match the described behavior.

/cygdrive/w/temp $ export CYGWIN=3Dwinsymlinks:nativestrict
/cygdrive/w/temp $ touch XXX
/cygdrive/w/temp $ ln -s XXX YYY
/cygdrive/w/temp $ ln -s YYY ZZZ
/cygdrive/w/temp $ ls -l
...
-rwxrwxr--+ ... XXX
lrwxrwxrwx  ... YYY -> /cygdrive/w/temp/XXX
lrwxrwxrwx  ... ZZZ -> /cygdrive/w/temp/YYY

What's interesting though, is that the paths are converted to absolute ones=
. This again only happens for winsymlinks:native, but NTFS symlinks have no=
 such restriction and `mklink` happily creates relative links.

>> Should that behaviour stay?
>=20
> Yes.  Consider that neither Cygwin or Interix symlinks with SYSTEM bit
> set, nor symlinks using WIndows shortcuts make any sense as part of a
> native symlink.  As a result, Cygwin does a full path conversion from
> POSIX to symlink-less Windows path to crate native symlinks.

I'm sorry, but I'm not sure I understand. What does "to be as part of a sym=
link" mean in this context and how did non-NTFS symlinks get into the discu=
ssion?

***

After thinking about this for some time, I began to assume that "part of a =
symlink" was meant as "a symlink target". In that case, it seems that Cygwi=
n is pretty intelligent about this, as the dereferencing only happens when =
targetting a non-NTFS symlink, at least in trivial cases. If that's the cas=
e, then I'm okay with that (and I'll try to document it), and the only ques=
tion that remains is the one about relative paths (see above).

--=20
David Macek


--------------ms000803000505030104040508
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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--------------ms000803000505030104040508--

- Raw text -