$ git clone -n https://src.fedoraproject.org/rpms/blender.git /var/lib/mock/f39-build-1875129-42733/root/chroot_tmpdir/scmroot/blender
Cloning into '/var/lib/mock/f39-build-1875129-42733/root/chroot_tmpdir/scmroot/blender'...
$ git fetch origin c9be30d02a9de4459f0ed9ab765c0f21592450b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blender
 * [new ref]         c9be30d02a9de4459f0ed9ab765c0f21592450b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9be30d [skip changelog]