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To: cygwin AT cygwin DOT com
Subject: Re: A/B install?
In-Reply-To: <377f01daf9a8$72152020$563f6060$@pdinc.us> (Jason Pyeron via
 Cygwin's message of "Wed, 28 Aug 2024 20:14:42 -0400")
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Date: Thu, 03 Oct 2024 20:16:59 +0200
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Jason Pyeron via Cygwin writes:
> I have been wondering if an A/B directory approach may help.
> Run from Cygwin.A, update Cygwin.B, stop processes and switch A and B.
>
> Thoughts?

You can have as many Cygwin installations on a single machine as you can
tell apart and they are all independent… so yes, provided you can ensure
that the currently in-use installation is not modified while you do this
(i.e. all work directories are separate mount points) and you have
enough space available for a duplicate installation, you can clone it to
a second root (*), run setup to update that while you keep using the old
installation, then switch the active installation by swapping the roots
at some convenient time.

(*) You must ensure that the DACL transfer unchanged and that you don't
copy files through symlinks or from outside the installation root.


Regards,
Achim.
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