A simple flake setup with tests and VM support

nix/configuration.nix

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+{ config, pkgs, inputs, lib, ... }:
+
+{
+  imports = [
+    ./users/users.nix
+    ./modules/ssh.nix
+    ./hardware-configuration.nix
+    ./modules/zsh.nix
+   ];
+
+  # nix settings
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # Bootloader.
+  boot.loader.grub.enable = true;
+
+  networking.hostName = "matrix";
+
+  # time zone
+  time.timeZone = "Europe/Zurich";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "de_DE.UTF-8";
+    LC_IDENTIFICATION = "de_DE.UTF-8";
+    LC_MEASUREMENT = "de_DE.UTF-8";
+    LC_MONETARY = "de_DE.UTF-8";
+    LC_NAME = "de_DE.UTF-8";
+    LC_NUMERIC = "de_DE.UTF-8";
+    LC_PAPER = "de_DE.UTF-8";
+    LC_TELEPHONE = "de_DE.UTF-8";
+    LC_TIME = "de_DE.UTF-8";
+  };
+
+  # Allow unfree packages
+  # nixpkgs.config.allowUnfree = true;
+
+  # List packages installed in system profile. To search, run:
+  environment.systemPackages = with pkgs; [
+  ];
+
+  virtualisation.vmVariant = {
+    # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize = 4000;
+      cores = 2;
+      graphics = false;
+      diskSize = 5000; # 5GB, needed to prevent docker error running out of space
+
+      # Networking configuration
+      #forwardPorts = [
+      #  { from = "host"; host.port = 2222; guest.port = 22; }
+      #];
+    };
+
+    # Add VM-specific users
+    users.users.smith = {
+      isNormalUser = true;
+      description = "VM Test User";
+      extraGroups = [ "wheel" "networkmanager" ];
+      shell = pkgs.zsh;
+      initialPassword = "smith";
+      packages = with pkgs; [  ];
+    };
+
+    security.sudo.wheelNeedsPassword = false;
+
+    # VM-specific packages
+    environment.systemPackages = with pkgs; [
+    ];
+
+    # in order to build VM on x86_64 host
+    nixpkgs.hostPlatform = lib.mkForce "x86_64-linux";
+  };
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.05"; # Did you read the comment?
+
+}

nix/disko.nix

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+
+{
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        device = "/dev/sda";
+        content = {
+          type = "gpt";
+          partitions = {
+            boot = {
+              size = "1M";
+              type = "EF02";
+              priority = 1;
+            };
+            ESP = {
+              size = "512M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}

nix/hardware-configuration.nix

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+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [ "ata_piix" "virtio_pci" "virtio_blk" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  networking.useDHCP = lib.mkDefault true;
+
+  # aarch64-linux?
+  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
+}

nix/modules/ssh.nix

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+{ config, pkgs, inputs, ... }:
+
+{
+  services.openssh = {
+    enable = true;
+    # permitRootLogin = "no";
+  };
+}

nix/modules/zsh.nix

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+{ lib, config, pkgs, ... }:
+
+{
+  programs.zsh = {
+    enable = true;
+    enableCompletion = true;
+    autosuggestions.enable = true;
+    syntaxHighlighting.enable = true;
+    enableLsColors = true;
+
+    histSize = 10000;
+    histFile = "$HOME/.zsh_history";
+  
+    shellAliases = {
+      ll = "ls - l";
+    };
+
+    ohMyZsh = {
+      enable = true;
+      plugins = [
+        "sudo"
+        #"direnv"
+        #"fzf"
+      ];
+      theme = "terminalparty";
+    };
+
+    # custom zsh options
+    setOptions = [
+      "HIST_IGNORE_DUPS" # do not write dupes
+      "HIST_SAVE_NO_DUPS"
+      "HIST_IGNORE_ALL_DUPS"
+      "HIST_FIND_NO_DUPS"
+      "APPEND_HISTORY" # append rather than overwrite ...?
+      "SHARE_HISTORY" # all zsh sessions share history file
+      "HIST_FCNTL_LOCK" # useful to prevent lockups ...? see github
+      "HIST_IGNORE_SPACE" # add space before command to not write to history
+    ];
+  };
+}

nix/tests/test1.nix

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+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.nixosTest {
+  name = "matrix-login-test";
+  
+  nodes = {
+    machine = { config, pkgs, ... }: {
+      imports = [
+        ../configuration.nix
+      ];
+      
+      # Test configuration
+      virtualisation.memorySize = 2048;
+    };
+  };
+
+  testScript = ''
+    start_all()
+    machine.wait_for_unit("multi-user.target")
+
+    with subtest("SSH service test"):
+        machine.wait_for_unit("sshd.service")
+        machine.wait_for_open_port(22)
+  '';
+}

nix/users/users.nix

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+{ config, pkgs, inputs, ... }:
+
+{
+  # Define user accounts
+  users.defaultUserShell = pkgs.zsh;
+  users.users.neo = {
+    isNormalUser = true;
+    description = "Matrix User 1";
+    extraGroups = [ "networkmanager" "wheel" ];
+    shell = pkgs.zsh;
+    packages = with pkgs; [ ];
+  };
+
+  users.users.morpheus = {
+    isNormalUser = true;
+    description = "Matrix User 2";
+    extraGroups = [ "networkmanager" "wheel" ];
+    shell = pkgs.zsh;
+    packages = with pkgs; [ ];
+  };
+
+  users.users.trinity = {
+    isNormalUser = true;
+    description = "Matrix User 3";
+    extraGroups = [ "networkmanager" "wheel" ];
+    shell = pkgs.zsh;
+    packages = with pkgs; [ ];
+  };
+}