$ git clone -n https://src.fedoraproject.org/rpms/kdbg.git /var/lib/mock/f40-build-2005467-45074/root/chroot_tmpdir/scmroot/kdbg
Cloning into '/var/lib/mock/f40-build-2005467-45074/root/chroot_tmpdir/scmroot/kdbg'...
$ git fetch origin ae9f6707608165c1b1d9c76b76cd79909e3e831c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdbg
 * [new ref]         ae9f6707608165c1b1d9c76b76cd79909e3e831c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae9f670 3.1.0