machine_setup/nix/configuration/flake.nix

# Build ISO image
#   doas nix run github:nix-community/nixos-generators -- --flake .#odo --format iso
{
  description = "My system configuration";

  inputs = {
    impermanence.url = "github:nix-community/impermanence";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs-b93b4e9b5.url = "github:NixOS/nixpkgs/b93b4e9b527904aadf52dba6ca35efde2067cbd4";
    home-manager.url = "github:nix-community/home-manager/release-24.11";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs =
    {
      self,
      nixpkgs,
      nixpkgs-unstable,
      nixpkgs-b93b4e9b5,
      impermanence,
      home-manager,
      ...
    }@inputs:
    let
      base-system = { };
      odoqemu = nixpkgs.lib.nixosSystem rec {
        system = "x86_64-linux";
        specialArgs = {
          pkgs-b93b4e9b5 = import nixpkgs-b93b4e9b5 {
            inherit system;
            # config.allowUnfree = true;
          };
          pkgs-unstable = import nixpkgs-unstable {
            inherit system;
            # config.allowUnfree = true;
          };
        };
        modules = [
          impermanence.nixosModules.impermanence
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;
          }
          ./configuration.nix
          (
            { lib, ... }:
            {
              imports = [ <nixpkgs/nixos/modules/virtualisation/qemu-vm.nix> ];
              virtualisation.qemu.options = [
                "-device virtio-vga"
              ];
              virtualisation.vmVariant = {
                # following configuration is added only when building VM with build-vm
                virtualisation = {
                  memorySize = 2048; # Use 2048MiB memory.
                  cores = 3;
                  graphics = false;
                };
              };
              networking.dhcpcd.enable = lib.mkForce true;
              networking.useDHCP = lib.mkForce true;
              boot.loader.efi.canTouchEfiVariables = lib.mkForce true;
              # doas nixos-rebuild build-vm --flake .#odoqemu
              #./result/bin/run-nixos-vm
            }
          )
        ];
      };
      odo = nixpkgs.lib.nixosSystem rec {
        system = "x86_64-linux";
        specialArgs = {
          pkgs-b93b4e9b5 = import nixpkgs-b93b4e9b5 {
            inherit system;
            # config.allowUnfree = true;
          };
          pkgs-unstable = import nixpkgs-unstable {
            inherit system;
            # config.allowUnfree = true;
          };
        };
        modules = [
          impermanence.nixosModules.impermanence
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;
          }
          ./configuration.nix
        ];
      };
    in
    {
      # doas nix build --extra-experimental-features nix-command --extra-experimental-features flakes .#vms.odo
      # ./result/bin/run-nixos-vim
      vms.odo = odoqemu.config.system.build.vm;
      odoiso = odo.config.system.build.isoImage;
      nixosConfigurations.odo = odo;
      nixosConfigurations.odovm = nixpkgs.lib.nixosSystem rec {
        system = "x86_64-linux";
        specialArgs = {
          pkgs-b93b4e9b5 = import nixpkgs-b93b4e9b5 {
            inherit system;
            # config.allowUnfree = true;
          };
          pkgs-unstable = import nixpkgs-unstable {
            inherit system;
            # config.allowUnfree = true;
          };
        };
        modules = [
          impermanence.nixosModules.impermanence
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;
          }
          ./configuration.nix
          (
            { lib, ... }:
            {
              networking.dhcpcd.enable = lib.mkForce true;
              networking.useDHCP = lib.mkForce true;
              boot.loader.efi.canTouchEfiVariables = lib.mkForce true;
            }
          )
        ];
      };
    };
}