$ git clone -n https://src.fedoraproject.org/rpms/embree3.git /var/lib/mock/f40-build-2403726-60556/root/chroot_tmpdir/scmroot/embree3
Cloning into '/var/lib/mock/f40-build-2403726-60556/root/chroot_tmpdir/scmroot/embree3'...
$ git fetch origin 6227dd13f494458f4726758fdae534b6cf86caf5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/embree3
 * [new ref]         6227dd13f494458f4726758fdae534b6cf86caf5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6227dd1 No longer needed by blender and other packages