$ git clone -n https://src.fedoraproject.org/rpms/toolbox.git /var/lib/mock/f39-build-1546460-36701/root/chroot_tmpdir/scmroot/toolbox
Cloning into '/var/lib/mock/f39-build-1546460-36701/root/chroot_tmpdir/scmroot/toolbox'...
$ git fetch origin b6101bf73fdcdc7e0e8ff2d75175a52eb490a952:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolbox
 * [new ref]         b6101bf73fdcdc7e0e8ff2d75175a52eb490a952 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6101bf Drop github.com/coreos/toolbox compatibility from RHEL 10 onwards