pkgs/nixfiles: move nixfiles-auto-install to pkg

pkgs/nixfiles/nixfiles-auto-install.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+
+pkgs.writeShellApplication {
+  name = "nixfiles-auto-install";
+  text = builtins.readFile ./nixfiles-auto-install.sh;
+  runtimeInputs = with pkgs; [
+    nixfiles-generate-config
+  ];
+}

pkgs/nixfiles/nixfiles-auto-install.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+hostname=host${RANDOM}
+
+echo "[I] Deploying with hostname ${hostname}"
+
+device=""
+for dev in "/dev/vda" "/dev/sda"; do
+  if [[ -b $dev ]]; then
+    device=$dev
+    break
+  fi
+done
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+  --hostname)
+    hostname=$2
+    shift
+    shift
+    ;;
+  *)
+    echo "unknown option: $1"
+    exit 1
+    ;;
+  esac
+done
+
+echo "[I] Formatting disk"
+
+if [[ -z $device ]]; then
+  echo "[E] No device to install to"
+  exit 1
+fi
+
+echo "[I] Using ${device}"
+
+parted --script $device mklabel gpt
+parted --script $device disk_set pmbr_boot on
+
+parted --script $device mkpart boot 0% 512M
+parted --script $device set 1 bios_grub on
+
+parted --script $device mkpart root 512M 100%
+
+echo "[I] Creating file system"
+
+mkfs.ext4 -F ${device}2
+
+echo "[I] Mount file system"
+
+mount ${device}2 /mnt
+
+echo "[I] Generate NixOS configuration"
+
+nixfiles-generate-config --root /mnt --hostname "${hostname}"
+
+sed -i "s~# boot\.loader\.grub\.device = \"/dev/sda\";~boot\.loader\.grub\.device = \"${device}\";~g" "/mnt/etc/nixos/hosts/${hostname}/configuration.nix"
+
+echo "[I] Install NixOS"
+
+nixos-install --flake "/mnt/etc/nixos#${hostname}" --root /mnt --no-root-password
+