$ git clone -n https://src.fedoraproject.org/rpms/erlang-cf.git /var/lib/mock/f41-build-side-1-2811239-32927/root/chroot_tmpdir/scmroot/erlang-cf
Cloning into '/var/lib/mock/f41-build-side-1-2811239-32927/root/chroot_tmpdir/scmroot/erlang-cf'...
$ git fetch origin 333293f52c56976b9dd2652bd2c4bf68293073b0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-cf
 * [new ref]         333293f52c56976b9dd2652bd2c4bf68293073b0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 333293f Cosmetic changes