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Date: | Tue, 24 Nov 2015 18:29:39 -0800 |
From: | Linda Walsh <cygwin AT tlinx DOT org> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: Symlink targets dereferenced when winsymlinks:native |
References: | <564BAA1A DOT 8000703 AT gmail DOT com> <20151118175503 DOT GT6402 AT calimero DOT vinschen DOT de> |
In-Reply-To: | <20151118175503.GT6402@calimero.vinschen.de> |
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Corinna Vinschen wrote: >> If it matters, the use case is `ln -sf /proc/self/fd /dev/fd`. > > 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. ---- Please don't. Why? It would be a built-in behavior difference between unix/linux symlinks and cygwin. symlink create on unix/linux doesn't look at the 'source' and create different types of links or different behaviors based on some ill-considered 'pathname filtering'. > Consider that /proc/self/fd has no meaning to non-Cygwin > processes at all. --- Unless you have a file-system driver, or a ".desktop.ini" in a windows created 'C:\Proc\.desktop.ini that redirects handlers for \proc to something similar. On my system, when I look at /proc/self/fd in cygwin+windows: cyg: /> ll /proc/self/fd total 0 lrwxrwxrwx 1 0 Nov 24 17:58 0 -> /dev/pty3 lrwxrwxrwx 1 0 Nov 24 17:58 1 -> /dev/pty3 lrwxrwxrwx 1 0 Nov 24 17:58 2 -> /dev/pty3 lrwxrwxrwx 1 0 Nov 24 17:58 3 -> /proc/21920/fd/ win: /> cmd Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\>dir \proc\self\fd /w dir \proc\self\fd /w Volume in drive C is System Disk Volume Serial Number is E889-68E4 Directory of C:\proc\self\fd [.] [..] 0 File(s) 0 bytes 2 Dir(s) 401,855,094,784 bytes free ---- i.e. it shows a directory that is empty, and according to windows, was created over a year ago: C:\>dir |grep -i proc dir |grep -i proc 01/23/2014 05:13 PM <DIR> proc As soon as you start prohibiting normal 'native' link creation based on some assumption about "who owns the path", I can't see how that won't end up biting you later. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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