$ git clone -n https://src.fedoraproject.org/rpms/screen.git /var/lib/mock/f45-build-35697-698/root/chroot_tmpdir/scmroot/screen
Cloning into '/var/lib/mock/f45-build-35697-698/root/chroot_tmpdir/scmroot/screen'...
$ git fetch origin 76b9fb245f82d2dbc29ab274dc0c9450e927ba1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/screen
 * [new ref]         76b9fb245f82d2dbc29ab274dc0c9450e927ba1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76b9fb2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild