$ git clone -n https://src.fedoraproject.org/rpms/rtorrent.git /var/lib/mock/f45-build-34749-691/root/chroot_tmpdir/scmroot/rtorrent
Cloning into '/var/lib/mock/f45-build-34749-691/root/chroot_tmpdir/scmroot/rtorrent'...
$ git fetch origin dd16afc6b68c55ff2c61635ed14cffe4063b8095:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rtorrent
 * [new ref]         dd16afc6b68c55ff2c61635ed14cffe4063b8095 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd16afc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild