$ sudo arch-chroot chroot
==> WARNING: chroot is not a mountpoint. This may have undesirable side effects.
root@kyo:/# git clone -b master --depth 1 https://github.com/JDimproved/JDim.git jdim
fatal: destination path 'jdim' already exists and is not an empty directory.
root@:/#

どうすればいいん？　ギットクローン　ビーマスター...？　これは何をしてるんかの？