mount -t tmpfs tmpfs fails

[Bob Willcox]

On Wed, Jun 14, 2017 at 02:14:45PM -0500, Bob Willcox wrote:
> I was attempting to run 'synth status' on my 12-current (drm-next) system
> and I got this error:
> 
> root at tavion:0 /> synth status
> Querying system about current package installations.
> Stand by, comparing installed packages against the ports tree.
> 
> raised REPLICANT.SCENARIO_UNEXPECTED : /sbin/mount -t tmpfs tmpfs /usr/obj/synth-live/SL09 => failed with code 1
> 
> So then I attempted just to do a mount of tmpfs command and got this:
> 
> root at tavion:0 /> mount -t tmpfs x /tmp/xxx  
> mount: x: Operation not supported by device
> 
> synth used to work on this system prior to my recent upgrade to the latest
> drm-next branch (cloned from github and build from source).
> 
> root at tavion:1 /> uname -a
> FreeBSD tavion.austin.ibm.com 12.0-CURRENT FreeBSD 12.0-CURRENT #1 da5f90154f1(drm-next): Tue Jun 13 16:58:52 CDT 2017     bob at tavion.austin.ibm.com:/usr/obj/usr/freebsd-base-graphics/sys/TAVION  amd64
> 
> Any suggestions on what I should be looking for (or fixing)?
> 
> Thanks,
> Bob

Ok, I finally figured out that my previous kernel must have had the tmpfs (and
nullfs, it was a problem also with synth) built into the kernel, probably by
default. Further, the tmpfs.ko and nullfs.ko modules weren't built and
installed.

I wound up building and installing both tmpfs and nullfs manually (cding to
their respective src direcdories and running make; make install) to get synth
to run.

My only question remaining now is was the removal of the building and
installing of these modules a fairly recent change in 12.0, or is something in
my system hosed up?

Thanks,
Bob

-- 
Bob Willcox    | Lawsuit, n.: A machine which you go into as a pig and
bob at immure.com |    come out as a sausage.
Austin, TX     |    -- Ambrose Bierce