$ git clone -n https://src.fedoraproject.org/rpms/kf6-kidletime.git /var/lib/mock/f40-build-787671-134881/root/chroot_tmpdir/scmroot/kf6-kidletime
Cloning into '/var/lib/mock/f40-build-787671-134881/root/chroot_tmpdir/scmroot/kf6-kidletime'...
$ git fetch origin b991d4206f3cd63fca86392f5aa69b08f22cac31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kidletime
 * [new ref]         b991d4206f3cd63fca86392f5aa69b08f22cac31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b991d42 6.0.0