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Date:	Thu, 3 Dec 2020 10:46:21 +0100
To:	cygwin AT cygwin DOT com
Subject:	Re: cygwin1.dll > 3.1.4: Program execution fails if (WSL-)symlink
	exists and is present in PATH
Message-ID:	<20201203094621.GA303847@calimero.vinschen.de>
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Dec  3 18:30, Takashi Yano via Cygwin wrote:
> On Wed, 2 Dec 2020 16:35:02 +0100
> Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com> wrote:
> > On Dec  2 15:05, Corinna Vinschen wrote:
> > > On Dec  2 13:39, Takashi Yano via Cygwin wrote:
> > > > On Tue, 1 Dec 2020 19:13:39 -0500
> > > > Ken Brown via Cygwin <cygwin AT cygwin DOT com> wrote:
> > > > > On 12/1/2020 4:24 AM, Mattl Mario wrote:
> > > > > > Hello,
> > > > > > 
> > > > > > Since cygwin1.dll version 3.1.5, I observed the following behavior:
> > > > > > If a symbolic link is existing in the PATH environment, programs (external from Cygwin's system directory) using cygwin1.dll cannot be executed anymore.
> > > > > > Possibly, because the Cygwin-DLL isn't found anymore.
> > > > > > 
> > > > > > Steps to reproduce:
> > > > > > 
> > > > > > cd /
> > > > > > mkdir link_test
> > > > > > cp /usr/bin/sed.exe link_test
> > > > > > ln -s link_test test
> > > > > > export PATH=/test:/link_test:/usr/bin:/bin
> > > > > > 
> > > > > > /link_test/sed cannot be executed
> > > > > > $ ldd /link_test/sed
> > > > > >          ntdll.dll => /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll (0x7ffffd960000)
> > > > > >          KERNEL32.DLL => /cygdrive/c/WINDOWS/System32/KERNEL32.DLL (0x7ffffd140000)
> > > > > >          KERNELBASE.dll => /cygdrive/c/WINDOWS/System32/KERNELBASE.dll (0x7ffffa8e0000)
> > > > > >          SYSFER.DLL => /cygdrive/c/WINDOWS/System32/SYSFER.DLL (0x550c0000)
> > > > > > 
> > > > > > -> no cygwin- DLLs found
> > > > > > [...]
> > > > > I think this was fixed by commit 4b4fffe0f2390be6a5be27b6a3ceaa212a3724b2, but I 
> > > > > don't have time to check carefully, and I'm going to be AFK for a few days 
> > > > > starting tomorrow.
> > > > 
> > > > I can reproduce this issue with current git head even with
> > > > the commit 4b4fffe0f2390be6a5be27b6a3ceaa212a3724b2.
> > > 
> > > Just looking into it.  It has something to do with missing to resolve
> > > a WSL symlinks to a Windows path, but I'm not sure yet where this occurs.
> > 
> > I pushed a patch and uploaded new developer snapshots to
> > https://cygwin.com/snapshots/
> > 
> > Please give it a try.
> 
> I have confirmed that the issue has been resolved on current git head.

Thanks for testing!


Corinna
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