$ git clone -n https://src.fedoraproject.org/rpms/graphviz.git /var/lib/mock/f45-build-20003-565/root/chroot_tmpdir/scmroot/graphviz
Cloning into '/var/lib/mock/f45-build-20003-565/root/chroot_tmpdir/scmroot/graphviz'...
$ git fetch origin 5bea02477ea3eb6f8f7ce74c92a34da8e903d9d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/graphviz
 * [new ref]         5bea02477ea3eb6f8f7ce74c92a34da8e903d9d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bea024 New version