$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rails.git /var/lib/mock/f45-build-35209-694/root/chroot_tmpdir/scmroot/rubygem-rails
Cloning into '/var/lib/mock/f45-build-35209-694/root/chroot_tmpdir/scmroot/rubygem-rails'...
$ git fetch origin cf64333eeae85e788a6329850b049913df6050f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rails
 * [new ref]         cf64333eeae85e788a6329850b049913df6050f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf64333 Update to Rails 8.1.3.1.