$ git clone -n https://src.fedoraproject.org/rpms/graphviz.git /var/lib/mock/f41-build-757233-13423/root/chroot_tmpdir/scmroot/graphviz
Cloning into '/var/lib/mock/f41-build-757233-13423/root/chroot_tmpdir/scmroot/graphviz'...
$ git fetch origin 9a504e89366c0c4096033abe781bc14dd3922f9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/graphviz
 * [new ref]         9a504e89366c0c4096033abe781bc14dd3922f9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a504e8 Split libraries into libs subpackage