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Date: Mon, 27 May 2024 16:12:22 +0300
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Subject: Re: Installing Cygwin as normal user in nonstandard location?
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From: Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
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Greetings, Martin Wege!

> On Sun, May 26, 2024 at 7:35 PM Andrey Repin <anrdaemon AT yandex DOT ru> wrote:
>>
>> Greetings, Martin Wege!
>>
>> >> Can Cygwin be installed as a normal user (without Admin rights) in a
>> >> > nonstandard location, like C.\Users\martinwege\cygwinroot36\...)?
>> >> >
>> >> > Also, can this be done for more than one Cygwin version, e.g. I'd like
>> >> > to test multiple Cygwin versions in parallel.
>> >> >
>> >>
>> >> (?) Why ask when you can just try both scenarios pretty easily?
>>
>> > Simple example for possible issues (might be more):
>> > Cygwin seems to modify the global REGISTRY with a "Install for
>> > everyone" (as Admin). What will happen then?
>>
>> Why would you try to "install for everyone" if you don't have an admin rights?
>>
>> > Can Cygwin installations installed as non-admin interact via Windows
>> > REGISTRY, or other unexpected ways?
>>
>> That's pretty strange question.

> Why?

Cygwin is a userland library and what you asking would be an exploit to the
underlying system.

>>
>> > So testing by a non-expert like me might not uncover
>> > such things immediately, so I better ask the experts here
>>
>> What do you ACTUALLY want to do?

> We want to install multiple Cygwin installations, so we can do
> (automated) regression testing. Also, the machines in question might
> already have one admin-installed&approved Cygwin installation for all
> users, which should not interact with any of the per-user
> installations used for testing.

If that admin-installed Cygwin version is out of control of your automated
testing setup, the chances it would interfere with it are far from zero.

My suggestion would be to not mess with user systems in such a way.
Use dedicated systems for automated testing.

If you still want your users to test with multiple Cygwin versions locally,
give them specific instructions to avoid collisions, s.a.:

  1. Clean environment.

%PATH%, %TEMP%, %TMP% and other relevant variables should not contain
reference to specific Cygwin installation. Use an appropriate CMD/PShell
wrapper script for environment sanitization to start testing instances.

  2.Clean start.

Don't launch Cygwin environments one from another. It IS possible to do so
cleanly, but better don't. Save your sanity.


-- 
With best regards,
Andrey Repin
Monday, May 27, 2024 15:58:34

Sorry for my terrible english...

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