$ git clone -n https://src.fedoraproject.org/rpms/embree.git /var/lib/mock/f40-build-792512-138440/root/chroot_tmpdir/scmroot/embree
Cloning into '/var/lib/mock/f40-build-792512-138440/root/chroot_tmpdir/scmroot/embree'...
$ git fetch origin 06317f74d67d150237ae8cae109d639509b36a08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/embree
 * [new ref]         06317f74d67d150237ae8cae109d639509b36a08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06317f7 update to 4.3.1