$ git clone -n https://src.fedoraproject.org/rpms/libtwin.git /var/lib/mock/f45-build-17153-496/root/chroot_tmpdir/scmroot/libtwin
Cloning into '/var/lib/mock/f45-build-17153-496/root/chroot_tmpdir/scmroot/libtwin'...
$ git fetch origin 83e16a85db653ff54e797672506f4b03fd32a5bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtwin
 * [new ref]         83e16a85db653ff54e797672506f4b03fd32a5bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83e16a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild