After partitioning, before running nixos-generate-config
:
mkdir /mnt/etc
nix-env -i git vim
cd /mnt/etc
git clone https://github.com/arnfinn/nixos-configuration nixos
cd /mnt/etc/nixos
nixos-generate-config --show-hardware-config >>hardware-configuration.nix
vim configuration.nix
nixos-install
reboot