$ git clone -n https://src.fedoraproject.org/rpms/kf5-kwindowsystem.git /var/lib/mock/f40-build-2140200-50849/root/chroot_tmpdir/scmroot/kf5-kwindowsystem
Cloning into '/var/lib/mock/f40-build-2140200-50849/root/chroot_tmpdir/scmroot/kf5-kwindowsystem'...
$ git fetch origin ab2d2822b1d07cb834a66d28e2bf649bfae6548e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kwindowsystem
 * [new ref]         ab2d2822b1d07cb834a66d28e2bf649bfae6548e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab2d282 5.113.0