Re: Change in logical link behaviour

[Rainer Emrich <rainer@emrich-ebersheim.de>]

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Am 03.03.2020 um 14:39 schrieb Corinna Vinschen:
> On Mar  3 14:17, Rainer Emrich wrote:
>> Dear Corinna,
>>
>> Am 02.03.2020 um 17:48 schrieb Corinna Vinschen:
>>> On Feb 29 14:10, Rainer Emrich wrote:
>>>> I try to reliably determine if native Windows symlink are working for a
>>>> current cygwin environment in a shell script.
>>>> [...]
>>>> On cygwin 3.1.4 I get:
>>>>
>>>>
>>>>     Directory: D:\cygwin\home\rainer\temp
>>>>
>>>>
>>>> Mode                LastWriteTime         Length Name
>>>> ----                -------------         ------ ----
>>>> d----        29.02.2020     13:58                asdfgh-1
>>>>
>>>> So now there is no indication that this is a link. Is this new behaviour
>>>> intended or a bug?
>>>>
>>>> I did not try on Windows 10, I'm still on windows 7.
>>>
>>> I can't reproduce this behaviour.  Keep in mind that, [bla]
>> I know all the implications. I have to test in an unknown cygwin
>> environment if it is possible to set native symlinks.
>>>
>>> So, on Windows 7 in an elevated shell:
>>>
>>>   # id -G | grep -Eq '\<544\>' && echo elevated || echo non-elevated
>>>   elevated
>>>   # uname -a
>>>   CYGWIN_NT-6.1 vmbert764 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin
>>>   # mkdir qwe
>>>   # cd qwe
>>>   # export CYGWIN="winsymlinks:nativestrict"
>>>   # touch foo
>>>   # ln -s foo bar
>>>   # cmd /c dir /a
>>>    Volume in drive C has no label.
>>>    Volume Serial Number is A8E0-A24E
>>>
>>>    Directory of C:\cygwin64\home\corinna\qwe
>>>
>>>   2020-03-02  17:31    <DIR>          .
>>>   2020-03-02  17:31    <DIR>          ..
>>>   2020-03-02  17:31    <SYMLINK>      bar [foo]
>>>   2020-03-02  17:31                 0 foo
>>>                  2 File(s)              0 bytes
>>> 		 2 Dir(s)   7.907.352.576 bytes free
>>>
>> Yes, this is the same for me, but if you use the powershell
>>
>> # powershell "& {Get-Item -Path bar | Select-Object}"
>>
>> on cygwin 3.0.7 you get
>>
>>     Directory: D:\cygwin\home\rainer\temp
>>
>> Mode                LastWriteTime         Length Name
>> ----                -------------         ------ ----
>> -a---l       03.03.2020     14:09              0 bar
>>
>> and on cygwin 3.1.4 you get
>>
>>     Directory: D:\cygwin\home\rainer\temp
>>
>> Mode                LastWriteTime         Length Name
>> ----                -------------         ------ ----
>> -a---        03.03.2020     14:09              0 bar
>>
>>
>> The only difference is the used cygwin version. So, I don't understand
>> what has changed.
> 
> Nothing has changed in terms of symlink handling.  Are you saying that
> `cmd /c dir /a' shows
> 
>   2020-03-03  14:21    <SYMLINK>      bar [foo]
> 
> but powershell shows
> 
>   -a---        03.03.2020     14:21              0 bar
> 
> for the same file?  That would be most puzzeling but certainly outside
> of Cygwin's control.
> 
> So I created a symlink again on W7 with Cygwin 3.1.4 and `export
> CYGWIN=winsymlinks:nativestrict', and tried with cmd *and* powershell
> (which I usually don't touch) and I see
> 
>   # uname -a
>   CYGWIN_NT-6.1 vmbert764 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin
>   # setenv CYGWIN winsymlinks:nativestrict
>   # ln -s foo bar
>   # cmd /c dir /a bar
>    Volume in drive C has no label.
>    Volume Serial Number is A8E0-A24E
> 
>    Directory of C:\cygwin64\home\corinna\qwe
> 
>   03.03.2020  14:30    <SYMLINK>      bar [foo]
> 		 1 File(s)              0 bytes
> 		 0 Dir(s)   7.929.241.600 bytes free
>   # powershell "& {Get-Item -Path bar | Select-Object}"
> 
> 
>       Directory: C:\cygwin64\home\corinna\qwe
> 
> 
>   Mode                LastWriteTime     Length Name
>   ----                -------------     ------ ----
>   -a---        03.03.2020     14:30          0 bar
> 
> Aha!  So powershell does not show the 'l'.
The most important thing is the difference between cygwin 3.0.7 and
cygwin 3.1.4. For cygwin 3.0.7 the link indicator is shown even in
powershell on Windows 7 but not with cygwin-3.1.4. And believe me, the
only difference is the cygwin version.

Rainer


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