bug#45198: 28.0.50; Sandbox mode

[Eli Zaretskii]

> From: Philipp <p.stephani2@gmail.com>
> Date: Sat, 17 Apr 2021 17:44:06 +0200
> Cc: João Távora <joaotavora@gmail.com>,
>  45198@debbugs.gnu.org, Stefan Kangas <stefankangas@gmail.com>,
>  Stefan Monnier <monnier@iro.umontreal.ca>, Alan Third <alan@idiocy.org>
> 
> > It works and can be pushed right away but it would be nice to have a place 
> > to use it, for validation and for tuning the interface. Any plans for that?
> > 
> 
> I think it would be better to first implement the mechanism and not the 
> high-level `sandbox-enter' function (I think that one needs a bit more 
> discussion), and implement the mechanism as a command-line flag.

IMO, if we have no reasonably clear idea how this will be used on the
high level, it might make sense to move this to a feature branch,
instead of working on master.  That's because without a high-level
view, there's no way people could try implementing the same
functionality on platforms other than GNU/Linux, let alone use it.  So
from my POV, at this point this is just an experiment, and we have
feature branches for that.