$ git clone -n https://src.fedoraproject.org/rpms/blender.git /var/lib/mock/f38-build-side-42-init-devel-1278108-30665/root/chroot_tmpdir/scmroot/blender
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1278108-30665/root/chroot_tmpdir/scmroot/blender'...
$ git fetch origin d5809be3ba83e9bfba1bfe0066a4766c557e4ca2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blender
 * [new ref]         d5809be3ba83e9bfba1bfe0066a4766c557e4ca2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5809be Upload sources