$ git clone -n https://src.fedoraproject.org/rpms/embree3.git /var/lib/mock/f41-build-858219-168325/root/chroot_tmpdir/scmroot/embree3
Cloning into '/var/lib/mock/f41-build-858219-168325/root/chroot_tmpdir/scmroot/embree3'...
$ git fetch origin dffd9fb11a950de76a59fe48a27370f822721bac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/embree3
 * [new ref]         dffd9fb11a950de76a59fe48a27370f822721bac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dffd9fb Rebuild for ispc 1.24.0