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From: Martin Vaeth <martin@mvath.de>
Subject: [gentoo-dev] Re: Requirements for UID/GID management
Date: Sat, 4 Feb 2017 18:03:25 +0000 (UTC)
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Christopher Head <chead@chead.ca> wrote:
>
> Are you sure that said utility isn't simply chown --from=?

As usual, I just checked the POSIX standard and not the
GNU extensions before posting  ;)

I did now a quick audit of the coreutils-8.25 source:
It seems to be safely implemented in the way I mentioned.