Re: sysctl to prevent reboot?

From: Konstantin Belousov <kostikbel_at_gmail.com>
Date: Thu, 10 Jul 2025 14:30:17 UTC 
On Thu, Jul 10, 2025 at 01:51:47PM +0000, Bjoern A. Zeeb wrote:
> On Thu, 10 Jul 2025, Zhenlei Huang wrote:
> 
> Hi,
> 
> > I believe Konstantin's work [1] and  [2] are precisely what you need.
> > 
> > [1] https://cgit.freebsd.org/src/commit/?id=7fb88c20eccc3fd2118fda2ba58d7afe2b87f7e3 <https://cgit.freebsd.org/src/commit/?id=7fb88c20eccc3fd2118fda2ba58d7afe2b87f7e3>   shutdown(8): refuse to run if /var/run/noshutdown is present
> > [2] https://cgit.freebsd.org/src/commit/?id=384d976725a5c29734a9227fcdb6ef0807485c91 <https://cgit.freebsd.org/src/commit/?id=384d976725a5c29734a9227fcdb6ef0807485c91>  rc.d: Add precious_machine rc.conf knob to create /var/run/noshutdown
> 
> Thanks!  I was looking in the wrong place.
> 
> That doesn't catch reboot, does it?  For me that's the offending command
> as I type that at the loader prompt (if I am in the correct window).

Reboot is very different from shutdown.  I never use it except on nfs-booted
crash boxes, so I did not considered.

If you think it is useful, I can add the check there too.