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Subject: Re: WSL symbolic links
To: cygwin AT cygwin DOT com
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From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Date: Fri, 27 Mar 2020 21:32:42 -0600
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On 2020-03-27 12:53, Corinna Vinschen wrote:
> 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 nor can it
>>>>>> be deleted:
>>>>>>> touch file
>>>>>>> wsl ln -s file link
>>>>>>> wsl ls -l link
>>>>>> lrwxrwxrwx    1 towo     towo             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 with
>>>>>   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).
>>>
>>> An strace of `ls -l u' may be helpful...
>>
>> 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 :)

Would you consider that test program a reasonable base for something I have
wished for a while: a program that would classify a file name as a (regular)
hard link, a Windows directory or file link, a junction, a Windows shortcut, a
Cygwin symlink, a Unix/WSL symlink, a URL link, and/or tell me where it links to
etc. Thinking of hacking that plus maybe bits of file, cygpath, readshortcut,
readlink, lsattr together to display otherwise awkward to access attributes and
properties.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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