Adding a new efi-update-loader script: need help understanding Makefile.inc1 for "make installworld"

[Rodney W. Grimes]

> On 3/25/19 8:05 AM, Warner Losh wrote:
> > We started installing /boot/loader with install world in FreeBSD -3.x and
> > it has affected the boot ability that whole time... in the early days of
> > loader, the kernel loader handoff protocol was immature enough to need a
> > matched kernel. But that period lasted only a few months...  loader has
> > also been weird in other ways as well, since some embedded systems used the
> > one in its, while others needed an extra step. As UEFI support has matured
> > we're finding there are several issues around it as well where updating the
> > ESP needs to be tied to updating /boot for the system to work sometimes. It
> > has grown more complex over time, so we should separate. It's been a little
> > weird on all the non x86 platforms to different degrees, but now that our
> > main platform is affected it's become clear we may need to change.
> > 
> > But we need to do so carefully as this violates POLA in a huge way, as well
> > as needing doc changes in a bajillion places.
> 
> I think we should treat files on the ESP the same way we treat other boot
> blocks.  installworld should continue to install the latest version into
> /boot (e.g. /boot/boot that holds UFS boot1 + boot2), but then some other
> tool is used by the user to copy the updated loader.efi into the ESP.
> 
> I think the main difference here is that traditionally other boot blocks
> didn't change very often, so no one really needed to update it them
> post-install.  loader.efi changes often enough we probably need to document
> updating the ESP as an optional step in the upgrade process.  I think
> having an automagical script will probably go sideways, but standardizing
> where to mounting the ESP (or ESPs when doing RAID mirroring, etc.) means
> we can provide a script with defaults (or instructions) that work with
> the standardized approach.

Is there anyway to stash an easy to extract "version" in
loader.* so that a Makefile/.sh script could easily check
to see that your boot code is == `uname -KU` and just emit
a warning at the end of installworld?

> John Baldwin
-- 
Rod Grimes                                                 rgrimes at freebsd.org