nixos-preinstall

sudo gdisk /dev/sda
sudo cryptsetup --key-size 512 --hash sha512 luksFormat /dev/sda2
sudo cryptsetup luksOpen /dev/sda2 cryptroot
sudo mkfs.vfat -F32 -n NIXBOOT /dev/sda1
sudo mkfs.ext4 -L NIXROOT /dev/mapper/cryptroot
sudo mount /dev/mapper/cryptroot /mnt
sudo mkdir -p /mnt/boot
sudo mount -o umask=0077 /dev/sda1 /mnt/boot

sudo nixos-generate-config --root /mnt
sudo nixos-install