$ git clone -n https://src.fedoraproject.org/rpms/fractal.git /var/lib/mock/f40-build-2703590-70838/root/chroot_tmpdir/scmroot/fractal
Cloning into '/var/lib/mock/f40-build-2703590-70838/root/chroot_tmpdir/scmroot/fractal'...
$ git fetch origin 988ae7beda9a6b2991fc8841aafe5006d9703b60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fractal
 * [new ref]         988ae7beda9a6b2991fc8841aafe5006d9703b60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 988ae7b Update to 6