$ git clone -n https://src.fedoraproject.org/rpms/byaccj.git /var/lib/mock/f40-build-794865-139796/root/chroot_tmpdir/scmroot/byaccj
Cloning into '/var/lib/mock/f40-build-794865-139796/root/chroot_tmpdir/scmroot/byaccj'...
$ git fetch origin 387108c61e93dce39f55db30b18f463bf042fe38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byaccj
 * [new ref]         387108c61e93dce39f55db30b18f463bf042fe38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 387108c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild