From efdcaf5b6400567fc55c39d44933e04cff131edb Mon Sep 17 00:00:00 2001
From: Chan Wen Xu <lutherchanpublic+git@gmail.com>
Date: Sat, 18 Dec 2021 18:21:54 +0800
Subject: [PATCH] feat: Add config for generating an installation media

It can be built using the command:
nix build .#nixosConfigurations.installationMedia.config.system.build.isoImage

It contains the latest kernel ZFS supports (ZFS is included in the ISO)
and a version of Nix with flakes enabled.
---
 config/installation_media.nix | 17 +++++++++++++++++
 flake.nix                     |  7 +++++++
 2 files changed, 24 insertions(+)
 create mode 100644 config/installation_media.nix

diff --git a/config/installation_media.nix b/config/installation_media.nix
new file mode 100644
index 0000000..82da2d9
--- /dev/null
+++ b/config/installation_media.nix
@@ -0,0 +1,17 @@
+{ nixpkgs, ... }:
+{ config, pkgs, ... }:
+
+let
+	pkgPath = nixpkgs.outPath;
+in
+{
+	imports = [
+		"${pkgPath}/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix"
+		"${pkgPath}/nixos/modules/installer/cd-dvd/channel.nix"
+	];
+
+	boot.kernelPackages = pkgs.zfs.latestCompatibleLinuxPackages;
+
+	nix.package = pkgs.nixUnstable;
+	nix.extraOptions = "experimental-features = nix-command flakes";
+}
diff --git a/flake.nix b/flake.nix
index 9fe12da..6b4136a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,6 +16,13 @@
 						./config/aspire_hardware.nix
 					];
 				};
+
+				installationMedia = nixpkgs.lib.nixosSystem {
+					system = "x86_64-linux";
+					modules = [
+						(import ./config/installation_media.nix inputs)
+					];
+				};
 			};
 
 			customPkgs = import ./pkg;