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Date: Fri, 27 Mar 2020 19:53:40 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: WSL symbolic links
Message-ID: <20200327185340.GN3261@calimero.vinschen.de>
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On Mar 27 11:58, Brian Inglis wrote:
> On 2020-03-26 14:05, Corinna Vinschen wrote:
> > On Mar 26 13:12, Brian Inglis wrote:
> >> On 2020-03-26 05:00, Corinna Vinschen wrote:
> >>> On Mar 26 10:00, Thomas Wolff wrote:
> >>>> A symbolic link created with WSL is neither interpreted in cygwin no=
r can it
> >>>> be deleted:
> >>>>> touch file
> >>>>> wsl ln -s file link
> >>>>> wsl ls -l link
> >>>> lrwxrwxrwx=C2=A0=C2=A0=C2=A0 1 towo=C2=A0=C2=A0=C2=A0=C2=A0 towo=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 Mar=
 26 08:56 link -> file
> >>>>> ls -l link
> >>>> -rw-r----- 1 Unknown+User Unknown+Group 0 Mar 26 00:00 link
> >>> What kind of file are they in the real world?  Reparse points?  If so,
> >>> what content do they have?  I attached a Q&D source from my vault
> >>> of old test apps to check on reparse point content.  Please compile w=
ith
> >>>   gcc -g ../src/rd-reparse.c -o rd-reparse -lntdll
> >>> It takes a single native NT path as parameter, kind of like this:
> >>>   ./rd-reparse '\??\C:\cygwin64\home\corinna\link'
> >> They should be WSL or Windows mklink (soft) links, and the reason why =
mklink was
> >> allowed unelevated in Windows 10 with Developer mode.
> >> In an *elevated* shell:
> >> $ ls -dln u
> >> -rw-r----- 1 4294967295 4294967295 0 Nov  9 06:09 u
> >                ^^^^^^^^^^^^^^^^^^^^^
> > This is unknown user, unknown group, which means, the Windows
> > function LookupAccountSid() probably returned a domain name which
> > is unknown (neither account domain, nor primary, nor trusted domain).
> >=20
> > An strace of `ls -l u' may be helpful...
>=20
> Attached with startup environment, locale, and message setup cut (reduced=
 by
> 100KB), and rest sanitized as below. Could DM/PM original on request.

Thanks!  This should already be fixed in the latest developer snapshot
after I was finally able to install WSL myself.  See my reply to Thomas
in https://sourceware.org/pipermail/cygwin/2020-March/244211.html

All the effects are a result of not opening the reparse point as reparse
point, as weird as it sounds at first :)


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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