$ git clone -n https://src.fedoraproject.org/rpms/graphviz.git /var/lib/mock/f41-build-842786-161707/root/chroot_tmpdir/scmroot/graphviz
Cloning into '/var/lib/mock/f41-build-842786-161707/root/chroot_tmpdir/scmroot/graphviz'...
$ git fetch origin c120430b85f47e4788406f8de0dea9e06e69da4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/graphviz
 * [new ref]         c120430b85f47e4788406f8de0dea9e06e69da4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c120430 New version