svn commit: r365643 - head/bin/cp

[Benjamin Kaduk]

On Sat, Sep 26, 2020 at 11:55 AM Warner Losh <imp at bsdimp.com> wrote:

> And there's the rub: how did this file come to exist? I'm certain it isn't
> booting or shutting down the system based on when devfs is mounted (before
> init) and unmounted (it's not done by the shutdown scripts). Now, it's
> always possible there's a hole in my understanding of the sequence of
> events. But given the examination of code, it's crazy to think this could
> be created by anything but some weird bug. That's why a step-by-step from
> scratch guide is needed. Im happy to look into it, but I need a bit more to
> go on.
>
>
I don't think it's terribly complicated; either set up a multi-boot system
or
pull the physical drive with / from one machine, and mount it while booted
into a different environment.  Then, chroot into it and do ... just about
anything.
If you didn't mount devfs before chrooting, then you get a file /dev/null
(and some
really confused errors from, e.g., buildworld!).

-Ben