From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21813 invoked by alias); 18 Nov 2015 18:13:42 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 21802 invoked by uid 89); 18 Nov 2015 18:13:41 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.4 required=5.0 tests=BAYES_00,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2 X-HELO: mail-wm0-f47.google.com Received: from mail-wm0-f47.google.com (HELO mail-wm0-f47.google.com) (74.125.82.47) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-GCM-SHA256 encrypted) ESMTPS; Wed, 18 Nov 2015 18:13:40 +0000 Received: by wmec201 with SMTP id c201so291935492wme.0 for ; Wed, 18 Nov 2015 10:13:37 -0800 (PST) X-Received: by 10.28.153.130 with SMTP id b124mr11606658wme.12.1447870417229; Wed, 18 Nov 2015 10:13:37 -0800 (PST) Received: from [192.168.1.202] ([164.215.120.147]) by smtp.gmail.com with ESMTPSA id b84sm4452852wmh.15.2015.11.18.10.13.36 for (version=TLSv1/SSLv3 cipher=OTHER); Wed, 18 Nov 2015 10:13:36 -0800 (PST) Subject: Re: Symlink targets dereferenced when winsymlinks:native To: cygwin@cygwin.com References: <564BAA1A.8000703@gmail.com> <20151118175503.GT6402@calimero.vinschen.de> From: David Macek Message-ID: <564CBFCC.4020605@gmail.com> Date: Wed, 18 Nov 2015 18:13:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <20151118175503.GT6402@calimero.vinschen.de> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms000807080307030004010907" X-IsSubscribed: yes X-SW-Source: 2015-11/txt/msg00254.txt.bz2 --------------ms000807080307030004010907 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-length: 1194 On 18. 11. 2015 18:55, Corinna Vinschen wrote: > On Nov 17 23:28, David Macek wrote: >> Hi. >> >> 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. >=20 > It's a result of the native symlink being a Windows path. The > ultimate conversion from POSIX to Windows path dereferences all > symlinks. Should that behaviour stay? If not, I can send a patch for the UG. >> That doesn't happed when >> using regular symlink files. Is this behaviour intentional / known? >> >> If it matters, the use case is `ln -sf /proc/self/fd /dev/fd`. >=20 > It matters. This is a bug in Cygwin, a missing test in fact. It should > never allow to create native symlinks to targets which only exist inside > of Cygwin. Consider that /proc/self/fd has no meaning to non-Cygwin > processes at all. Creating this symlink as native symlink doesn't make > any sense, they should always be generated as Cygwin-only symlinks. >=20 > Thanks for the report, I'll apply a matching patch. 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