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Message-ID: <cd5b9101-58d9-48ea-8e85-b7334737d16c@kircheis.it>
Date: Thu, 2 Jan 2025 18:13:55 +0100
MIME-Version: 1.0
Subject: Re: env and PATH
To: cygwin AT cygwin DOT com
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From: Federico Kircheis via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Federico Kircheis <federico AT kircheis DOT it>
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On 02/01/2025 10.34, Federico Kircheis wrote:
> On 20/12/2024 23.15, Brian Inglis via Cygwin wrote:
>> Hi Federico,
>>
>> Looks like non-Cygwin program launch is messing up PATH not on the 
>> current drive:
>>
>> $ cd /proc/cygdrive/d
>> $ cat -A /proc/cygdrive/d/tmp/t.cmd
>> echo %PATH%^M$
>> $ env -i PATH='C:\Windows;C:\Windows\system32;' /bin/sh -c 'echo $PATH'
>> C:\Windows;C:\Windows\system32;
>> $ env -i PATH='C:\Windows;C:\Windows\system32;' `cygpath $COMSPEC` / 
>> s /c \
>> "d:\tmp\t.cmd"
>> D:\>echo C;D:\Windows;C;D:\Windows\system32;
>> C;D:\Windows;C;D:\Windows\system32;
>> D:\>exit
> 
> I did some other testing
> 
>  From cygwin, without using env explicitly
> 
>  > PATH='D:\windows' /c/Windows/System32/WindowsPowerShell/v1.0/ 
> powershell.exe
>  > echo $env:PATH
> D;C:\windows
> 
> (similar result for cmd)
> 
>  From powershell
> 
>  > $env:PATH="D:\windows"
>  > C:/Windows/System32/WindowsPowerShell/v1.0/powershell.exe
>  > echo $env:PATH
> D:\windows
> 
> (similar result for cmd)
> 
> I also tried
> 
> PATH='D:\windows' /usr/bin/cygstart /c/Windows/System32/ 
> WindowsPowerShell/v1.0/powershell.exe
> 
> hoping it would do the trick, but PATH is still "broken", and powershell 
> starts in a separate window :(

And obvisouyl I also tried

 > PATH="/cydrive/c/windows:/cygdrive/d/windows" 
/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe
 > echo $env:PATH
C:\Windows;D:\Windows

So it still looks like cygwin translates the paths when creating a new 
process.

 From powershell
 > $env:PATH="/d/windows"
 > C:/Windows/System32/WindowsPowerShell/v1.0/powershell.exe
 > echo $env:PATH
/d/windows

which seems to imply that powershell (and cmd) gets the environment 
variable PATH as-is


> 
>>
>> On 2024-12-20 09:51, Federico Kircheis via Cygwin wrote:
>>> Hello to everyone,
>>>
>>>
>>> I've noticed that env seems to handle the environment variable PATH 
>>> in a particular way
>>>
>>>
>>> -----
>>>  > cd /d;
>>>  > env -i PATH='C:\Windows;C:\Windows\system32;' /c/Windows/System32/ 
>>> WindowsPowerShell/v1.0/powershell.exe
>>> # in the powershell instance
>>> echo $env:PATH
>>> C;D:\Windows;C;D:\Windows\system32;
>>> ----
>>>
>>>
>>>  From this and other examples it seems that env uses for PATH  as 
>>> separator, then preprends the current drive to all paths that begin 
>>> with '\' (thus all of them), and ";" is treated as part of the path
>>>
>>>
>>> I would like to use the PATH as-is in the invoked program, just like 
>>> it is done for other variables, for example
>>>
>>> ----
>>> cd /d
>>> env -i OPATH='C:\Windows;C:\Windows\system32;' /c/Windows/System32/ 
>>> WindowsPowerShell/v1.0/powershell.exe
>>> # in the powershell instance
>>> echo $env:OPATH
>>> C:\Windows;C:\Windows\system32;
>>> ----
>>>
>>> in this case OPATH is forwarded as-is to powershell.exe.
>>>
>>> I understand that PATH is special, that for cygwin processes some 
>>> transformation might be necessary.
>>>
>>> But is there any way to achieve what I'm trying?
>>>
>>> I search if there is maybe a separation option for telling env to use 
>>> PATH as- is, but could not find none.
>>>
>>> Best
>>>
>>> Federico


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