$ git clone -n https://src.fedoraproject.org/rpms/matchbox-window-manager.git /var/lib/mock/f45-build-18047-507/root/chroot_tmpdir/scmroot/matchbox-window-manager
Cloning into '/var/lib/mock/f45-build-18047-507/root/chroot_tmpdir/scmroot/matchbox-window-manager'...
$ git fetch origin cf288153c8024dfedcda4c57ae0740fd674ac763:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/matchbox-window-manager
 * [new ref]         cf288153c8024dfedcda4c57ae0740fd674ac763 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf28815 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild