$ git clone -n https://src.fedoraproject.org/rpms/embree3.git /var/lib/mock/f41-build-749612-13378/root/chroot_tmpdir/scmroot/embree3
Cloning into '/var/lib/mock/f41-build-749612-13378/root/chroot_tmpdir/scmroot/embree3'...
$ git fetch origin 751db267a64a71468077b4fa5780782ba1ff6b51:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/embree3
 * [new ref]         751db267a64a71468077b4fa5780782ba1ff6b51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 751db26 Unretirement releng request: https://pagure.io/releng/issue/11964