NixConfigs

First thing first, you should install NixOS on a USB Drive and boot on it.
Create a FAT32 partition of 512M for the /boot/efi (UEFI), flag it as esp,boot.
You sould create a LUKS drive (using cryptsetup)
Likely using cryptsetup --type luks1 luksFormat /dev/sdXX
Unlock it with cryptsetup luksOpen /dev/sdXX cryptoroot
You should create the LVM partitions: Likely using pvcreate, vgcreate and lvcreate.

   # pvcreate /dev/mapper/cryptoroot
   # vgcreate vg-root /dev/mapper/cryptoroot
   # lvcreate -L 8G -n swap vg-root
   # lvcreate -l 100%FREE -n root vg-root

Format the root and swap partitions:

   # mkfs.ext4 /dev/vg-root/root
   # mkswap /dev/vg-root/swap

Mount the partition (root in /mnt & boot in /mnt/boot/efi)

   # mount /dev/vg-root/root /mnt
   # mkdir -p /mnt/boot/efi
   # mount /dev/sda1 /mnt/boot/efi

Generate NixOS config:

Note	You might need to activate SWAP : `swapon /dev/vg-root/swap`

   # nixos-generate-config --root /mnt

Setup NixFlakes and set hostname

/mnt/etc/nixos/configuration.nix

{ config, pkgs, ... }:

{
  imports =
   [
      # ...
   ]

# Just below the import !!!

  nix = {
    package = pkgs.nixUnstable;
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
  };

  networking.hostname = "value";

# ...
}

Clone this repository and from the generated config get the needed info for /hardware/

   $ cd /tmp
   $ git clone https://github.com/fusetim/nix-config.git
   # cp -r /tmp/nix-config/* /mnt/etc/nixos/

nixos-install & reboot
Enjoy!

License

Licensed under both the MIT license and the Apache License 2.0.