$ git clone -n https://src.fedoraproject.org/rpms/blender.git /var/lib/mock/f40-build-2390994-60526/root/chroot_tmpdir/scmroot/blender
Cloning into '/var/lib/mock/f40-build-2390994-60526/root/chroot_tmpdir/scmroot/blender'...
$ git fetch origin ffd75fde639e076f34be4f475b9e5fb6f9b70ed4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blender
 * [new ref]         ffd75fde639e076f34be4f475b9e5fb6f9b70ed4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffd75fd Rebuild for OpenImageIO 2.5.x.