Re: Finding the git hash for a build

On Fri, 19 Jul 2024, at 06:13, Kevin Oberman wrote:
> I need to roll back my system to main-n271000-5654b42142e1. After an 
> update of the system today, it crashes in network startup and I need to 
> get back to a working system while I try to figure out why it won't 
> boot. Probably by bisecting the source. 
>
> Right now, I am getting an error from 'geli attach' of:
> geli: Invalid class name 'eli'.
> This is probably the result of kernel and world not being in sync as I 
> had to restore the boot/modules directory to the state of the old 
> kernel.
>
> I had assumed that the version was a hash that I could use to get my 
> kernel and world back to a working state. I could restore from backup, 
> but would like to get back to the exact system of the kernel.old.
>
> I am just a git newby and trying to use 5654b42142e1 reports that the 
> hash is not found. I'lladmit that I'm lost!


Hi Kevin

you're correct, you can check via https://cgit.freebsd.org/src/commit/?id=5654b42142e1
for example.

Assuming you are already on main branch:

cd /usr/src
### switch to the main branch if not already on it
git switch main
### make sure we have all the recent commits, hopefully including that one
git fetch origin main
### reset our "main" reference to that commit
git reset --hard 5654b42142e1
### clean up any stray rubbish
git clean -fdx

and then rebuild as usual.

A lazier way would be to grab base & kernel from https://download.freebsd.org/ftp/snapshots/amd64/amd64/15.0-CURRENT/ there's a GITBRANCH and REVISION file in there you can compare from.

An even lazier way would be boot environments, if you have zfs.

A+
Dave