$ git clone -n https://src.fedoraproject.org/rpms/kscreen.git /var/lib/mock/f45-build-39863-763/root/chroot_tmpdir/scmroot/kscreen
Cloning into '/var/lib/mock/f45-build-39863-763/root/chroot_tmpdir/scmroot/kscreen'...
$ git fetch origin 832313557c97b1272e2715cd4712d8ff34b723cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kscreen
 * [new ref]         832313557c97b1272e2715cd4712d8ff34b723cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8323135 6.7.5