Bug#880920: Document Rules-Requires-Root field

[Ian Jackson <ijackson@chiark.greenend.org.uk>]

Josh Triplett writes ("Bug#880920: Document Rules-Requires-Root field"):
> On Fri, 29 Dec 2017 11:29:00 +0000 Niels Thykier <niels@thykier.net> wrote:
> > +  # Command "sudo", with arguments "-nE" and "--"
> > +  export DPKG_GAIN_ROOT_CMD='sudo -nE --'
> > +  # Command "fakeroot" with the single argument "--"
> > +  export DPKG_GAIN_ROOT_CMD='fakeroot --'
> 
> You use sudo with -E here to preserve the environment. If that's a
> requirement, then the preceding paragraph should explicitly say
> something like "the command must preserve all environment variables,
> unmodified".

I think the environment does need to be preserved, indeed.

Ian.

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