nixos unstable flake installation from nixos 20.09

nixos-install.sh

#!/bin/sh

set -x

DEVICE=/dev/vda
SWAP_SIZE=2GiB
URI=github:kanashimia/nixos/module-refactor#personal-server
TYPE=legacy

trap "swapoff $DEVICE; umount /mnt/boot; umount /mnt; exit" INT

if [ $TYPE = legacy ]; then
  parted $DEVICE -- mklabel msdos
  parted $DEVICE -- mkpart primary 1MiB -$SWAP_SIZE
  parted $DEVICE -- mkpart primary linux-swap -$SWAP_SIZE 100%
else
  parted $DEVICE -- mklabel gpt
  parted $DEVICE -- mkpart primary 512MiB -$SWAP_SIZE
  parted $DEVICE -- mkpart primary linux-swap -$SWAP_SIZE 100%
  parted $DEVICE -- mkpart ESP fat32 1MiB 512MiB
  parted $DEVICE -- set 3 esp on
fi
 
mkfs.ext4 -L nixos ${DEVICE}1

mkswap -L swap ${DEVICE}2
swapon ${DEVICE}2

mount /dev/disk/by-label/nixos /mnt

if [ $TYPE != legacy ]; then
  mkfs.fat -F 32 -n boot ${DEVICE}3
  mkdir -p /mnt/boot
  mount /dev/disk/by-label/boot /mnt/boot
fi

nix-shell -p nixFlakes --run "nixos-install --flake $URI"