NixOS UEFI automated install

install.sh

#!/usr/bin/env bash

# Run with `sudo`
# Environment variables:
# NIXOS_INSTALL_SWAP_SIZE (default: "8GiB")
# NIXOS_INSTALL_ROOT_DRIVE (default: "/dev/sda")
# NIXOS_INSTALL_EDIT_CONFIGURATION_FILE (default: "yes", accepted value: "no")

# https://stackoverflow.com/a/2013589
NIXOS_INSTALL_SWAP_SIZE="${NIXOS_INSTALL_SWAP_SIZE:=8GiB}"
NIXOS_INSTALL_ROOT_DRIVE="${NIXOS_INSTALL_ROOT_DRIVE:=/dev/sda}"
NIXOS_INSTALL_EDIT_CONFIGURATION_FILE="${NIXOS_INSTALL_EDIT_CONFIGURATION_FILE:=yes}"

parted "${NIXOS_INSTALL_ROOT_DRIVE}" -- mklabel gpt
parted "${NIXOS_INSTALL_ROOT_DRIVE}" -- mkpart primary 512MiB -"${NIXOS_INSTALL_SWAP_SIZE}"
parted "${NIXOS_INSTALL_ROOT_DRIVE}" -- mkpart primary linux-swap -"${NIXOS_INSTALL_SWAP_SIZE}" 100%
parted "${NIXOS_INSTALL_ROOT_DRIVE}" -- mkpart ESP fat32 1MiB 512MiB
parted "${NIXOS_INSTALL_ROOT_DRIVE}" -- set 3 esp on
mkfs.ext4 -L nixos "${NIXOS_INSTALL_ROOT_DRIVE}"1 # /dev/sda1
sleep 1
mkswap -L swap "${NIXOS_INSTALL_ROOT_DRIVE}"2 # /dev/sda2
sleep 1
mkfs.fat -F 32 -n boot "${NIXOS_INSTALL_ROOT_DRIVE}"3 # /dev/sda3
sleep 1
mount /dev/disk/by-label/nixos /mnt
mkdir -p /mnt/boot
mount /dev/disk/by-label/boot /mnt/boot
swapon "${NIXOS_INSTALL_ROOT_DRIVE}"2
sleep 1
nixos-generate-config --root /mnt
if [ "${NIXOS_INSTALL_EDIT_CONFIGURATION_FILE}" == "yes" ]; then
  printf "You are about to enter vim to edit /mnt/etc/nix/configuration.nix\nPress any key to continue..."
  read
  vim /mnt/etc/nixos/configuration.nix
fi
printf "Installation will continue after this. Press any key to continue..."
read
nixos-install # now, wait a while