$ git clone -n https://src.fedoraproject.org/rpms/tiptop.git /var/lib/mock/f45-build-37200-712/root/chroot_tmpdir/scmroot/tiptop
Cloning into '/var/lib/mock/f45-build-37200-712/root/chroot_tmpdir/scmroot/tiptop'...
$ git fetch origin f8439c3ae846a17743ce74bdf31c87b9b373d121:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tiptop
 * [new ref]         f8439c3ae846a17743ce74bdf31c87b9b373d121 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8439c3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild