$ git clone -n https://src.fedoraproject.org/rpms/embree.git /var/lib/mock/f38-build-side-42-init-devel-818868-28339/root/chroot_tmpdir/scmroot/embree
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-818868-28339/root/chroot_tmpdir/scmroot/embree'...
$ git fetch origin f8194deab4b26936cb443ee2ac80f7bfbcca38a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/embree
 * [new ref]         f8194deab4b26936cb443ee2ac80f7bfbcca38a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8194de required ISA changes for ospray