$ git clone -n https://src.fedoraproject.org/rpms/kgraphviewer.git /var/lib/mock/f42-build-3436952-45433/root/chroot_tmpdir/scmroot/kgraphviewer
Cloning into '/var/lib/mock/f42-build-3436952-45433/root/chroot_tmpdir/scmroot/kgraphviewer'...
$ git fetch origin 3e63115243e47ee388330eaaae6358f12c56a078:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kgraphviewer
 * [new ref]         3e63115243e47ee388330eaaae6358f12c56a078 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e63115 25.03.80