$ git clone -n https://src.fedoraproject.org/rpms/graphviz.git /var/lib/mock/f42-build-side-1-3498651-45963/root/chroot_tmpdir/scmroot/graphviz
Cloning into '/var/lib/mock/f42-build-side-1-3498651-45963/root/chroot_tmpdir/scmroot/graphviz'...
$ git fetch origin 58d8debd57223f814d7f588dad99c7404838f018:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/graphviz
 * [new ref]         58d8debd57223f814d7f588dad99c7404838f018 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58d8deb R-maint-sig mass rebuild