fix: Fail the CI if formatting fails

Reviewed-on: http://git.factory.uga.edu/UGA-Innovation-Factory/athenix/pulls/32

.gitea/workflows/ci.yml

@@ -26,18 +26,23 @@ jobs:
   format-check:
     name: Format Check
     runs-on: [self-hosted, nix-builder]
+    timeout-minutes: 5
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
       - name: Check formatting
+        timeout-minutes: 3
         run: |
-          nix fmt **/*.nix
+          set -euo pipefail
-          if ! git diff --quiet; then
+          echo "Checking code formatting..."
+          output=$(nix fmt **/*.nix 2>&1)
+          if [ -n "$output" ]; then
             echo "::error::Code is not formatted. Please run 'nix fmt **/*.nix' locally."
-            git diff
+            echo "$output"
             exit 1
           fi
+          echo "All files are properly formatted"
 
   eval-configs:
     name: Evaluate Key Configurations
@@ -79,3 +84,39 @@ jobs:
           echo "Evaluating artifact ${{ matrix.artifact }}"
           nix eval .#${{ matrix.artifact }}.drvPath \
             --show-trace
+
+  build-docs:
+    name: Build and Publish Documentation
+    runs-on: [self-hosted, nix-builder]
+    needs: [flake-check]
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build documentation
+        run: |
+          echo "Building Athenix documentation"
+          nix build .#docs --print-build-logs
+
+      - name: Clone wiki repository
+        run: |
+          git clone git@factory.uga.edu:UGA-Innovation-Factory/athenix.wiki.git wiki
+          cd wiki
+          git config user.name "Athenix CI"
+          git config user.email "ci@athenix.factory.uga.edu"
+
+      - name: Update wiki with documentation
+        run: |
+          # Copy documentation to wiki
+          cp -r result/* wiki/
+          
+          # Commit and push changes
+          cd wiki
+          git add .
+          if git diff --staged --quiet; then
+            echo "No documentation changes to commit"
+          else
+            git commit -m "Update documentation from commit ${{ github.sha }}"
+            git push
+          fi

.github/workflows/docs.yml

@@ -0,0 +1,34 @@
+name: Build Documentation
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - uses: DeterminateSystems/nix-installer-action@main
+      
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      
+      - name: Build documentation
+        run: |
+          nix build .#docs
+          nix build .#athenix-options
+          
+      - name: Upload documentation
+        uses: actions/upload-artifact@v4
+        with:
+          name: athenix-docs
+          path: result/
+          
+      - name: Deploy to GitHub Pages
+        if: github.ref == 'refs/heads/main'
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./result

.nixd.json

@@ -0,0 +1,18 @@
+{
+  "eval": {
+    "target": {
+      "installable": ".#nixosConfigurations.nix-desktop1.options"
+    }
+  },
+  "formatting": {
+    "command": ["nixfmt"]
+  },
+  "options": {
+    "nixos": {
+      "expr": "(builtins.getFlake \"/home/engr-ugaif/athenix\").nixosConfigurations.nix-desktop1.options"
+    },
+    "home-manager": {
+      "expr": "(builtins.getFlake \"/home/engr-ugaif/athenix\").nixosConfigurations.nix-desktop1.config.home-manager.users.engr-ugaif.options"
+    }
+  }
+}

flake.lock

@@ -239,6 +239,24 @@
       "inputs": {
         "systems": "systems_4"
       },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_4": {
+      "inputs": {
+        "systems": "systems_5"
+      },
       "locked": {
         "lastModified": 1681202837,
         "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
@@ -636,6 +654,7 @@
         "nixos-wsl": "nixos-wsl",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-old-kernel": "nixpkgs-old-kernel",
+        "usda-vision": "usda-vision",
         "vscode-server": "vscode-server"
       }
     },
@@ -720,6 +739,21 @@
         "type": "github"
       }
     },
+    "systems_5": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [
@@ -742,13 +776,34 @@
         "type": "github"
       }
     },
-    "vscode-server": {
+    "usda-vision": {
       "inputs": {
         "flake-utils": "flake-utils_3",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
+      "locked": {
+        "lastModified": 1769814438,
+        "narHash": "sha256-DEZrmqpqbrd996W5p1r4GA1C8Jmo31n3N642ccS0deY=",
+        "ref": "refs/heads/main",
+        "rev": "78bfcf02612817a2cee1edbf92deeac9bf657613",
+        "revCount": 126,
+        "type": "git",
+        "url": "https://git.factory.uga.edu/MODEL/usda-vision.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.factory.uga.edu/MODEL/usda-vision.git"
+      }
+    },
+    "vscode-server": {
+      "inputs": {
+        "flake-utils": "flake-utils_4",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
       "locked": {
         "lastModified": 1753541826,
         "narHash": "sha256-foGgZu8+bCNIGeuDqQ84jNbmKZpd+JvnrL2WlyU4tuU=",

flake.nix

@@ -59,10 +59,16 @@
       url = "github:nix-community/NixOS-WSL/main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    # USDA Vision Dashboard application
+    usda-vision = {
+      url = "git+https://git.factory.uga.edu/MODEL/usda-vision.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs =
-    inputs@{ flake-parts, ... }:
+    inputs@{ self, flake-parts, ... }:
     flake-parts.lib.mkFlake { inherit inputs; } {
       # Support all common systems
       systems = [
@@ -80,8 +86,10 @@
         ./parts/nixos-modules.nix
         ./parts/packages.nix
         ./parts/templates.nix
+        ./parts/docs.nix
         ./inventory.nix
         ./users.nix
       ];
     };
+
 }

fleet/boot.nix

@@ -5,9 +5,24 @@
 # - Bootloader configuration (systemd-boot with Plymouth)
 # - Timezone and locale settings
 # - Systemd sleep configuration
+#
+# Only applies to:
+# - Linux systems (not Darwin/macOS)
+# - Systems with actual boot hardware (not containers/WSL)
 
-{ config, lib, ... }:
 {
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  # Check if this is a bootable system (not container, not WSL)
+  isBootable = !(config.boot.isContainer or false) && (pkgs.stdenv.isLinux);
+in
+{
+  config = lib.mkIf isBootable {
     boot = {
       loader.systemd-boot.enable = lib.mkDefault true;
       loader.efi.canTouchEfiVariables = lib.mkDefault true;
@@ -45,4 +60,5 @@
       SuspendState=freeze
       HibernateDelaySec=2h
     '';
+  };
 }

fleet/common.nix

@@ -5,19 +5,150 @@
 # It is automatically imported by the fleet generator for every host.
 
 {
-  inputs,
   config,
   lib,
+  inputs,
   ...
 }:
+let
+  # Import all hardware modules so they're available for enabling
+  hwTypes = import ../hw { inherit inputs; };
+  hwModules = lib.attrValues hwTypes;
+
+  # User account submodule definition
+  userSubmodule = lib.types.submodule {
+    options = {
+      enable = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = "Whether this user account is enabled on this system.";
+      };
+      isNormalUser = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = "Whether this is a normal user account (vs system user).";
+      };
+      description = lib.mkOption {
+        type = lib.types.nullOr lib.types.str;
+        default = null;
+        description = "Full name or description of the user (GECOS field).";
+        example = "John Doe";
+      };
+      extraGroups = lib.mkOption {
+        type = lib.types.listOf lib.types.str;
+        default = [ ];
+        description = "Additional groups for the user (wheel, docker, etc.).";
+      };
+      hashedPassword = lib.mkOption {
+        type = lib.types.str;
+        default = "!";
+        description = "Hashed password for the user account. Default '!' means locked.";
+      };
+      extraPackages = lib.mkOption {
+        type = lib.types.listOf lib.types.package;
+        default = [ ];
+        description = "Additional system packages available to this user.";
+      };
+      excludePackages = lib.mkOption {
+        type = lib.types.listOf lib.types.package;
+        default = [ ];
+        description = "System packages to exclude for this user.";
+      };
+      homePackages = lib.mkOption {
+        type = lib.types.listOf lib.types.package;
+        default = [ ];
+        description = "Packages to install in the user's home-manager profile.";
+      };
+      extraImports = lib.mkOption {
+        type = lib.types.listOf lib.types.path;
+        default = [ ];
+        description = "Additional home-manager modules to import for this user.";
+      };
+      external = lib.mkOption {
+        type = lib.types.nullOr (
+          lib.types.oneOf [
+            lib.types.path
+            (lib.types.submodule {
+              options = {
+                url = lib.mkOption {
+                  type = lib.types.str;
+                  description = "Git repository URL to fetch user configuration from.";
+                };
+                rev = lib.mkOption {
+                  type = lib.types.str;
+                  description = "Git commit hash, tag, or branch to fetch.";
+                };
+                submodules = lib.mkOption {
+                  type = lib.types.bool;
+                  default = false;
+                  description = "Whether to fetch Git submodules.";
+                };
+              };
+            })
+          ]
+        );
+        default = null;
+        description = "External dotfiles repository (user.nix + optional nixos.nix).";
+      };
+      opensshKeys = lib.mkOption {
+        type = lib.types.listOf lib.types.str;
+        default = [ ];
+        description = "SSH public keys for the user (authorized_keys).";
+      };
+      shell = lib.mkOption {
+        type = lib.types.nullOr (
+          lib.types.enum [
+            "bash"
+            "zsh"
+            "fish"
+            "tcsh"
+          ]
+        );
+        default = "bash";
+        description = "Default shell for the user.";
+      };
+      editor = lib.mkOption {
+        type = lib.types.nullOr (
+          lib.types.enum [
+            "vim"
+            "neovim"
+            "emacs"
+            "nano"
+            "code"
+          ]
+        );
+        default = "neovim";
+        description = "Default text editor for the user (sets EDITOR).";
+      };
+      useZshTheme = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = "Whether to apply the system Zsh theme (Oh My Posh).";
+      };
+      useNvimPlugins = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = "Whether to apply the system Neovim configuration.";
+      };
+    };
+  };
+in
 {
   imports = [
     ./fs.nix
     ./boot.nix
     ./user-config.nix
-    ./fleet-option.nix
     ../sw
-  ];
+    inputs.vscode-server.nixosModules.default
+    inputs.nixos-wsl.nixosModules.default
+  ]
+  ++ hwModules;
+
+  options.athenix.users = lib.mkOption {
+    type = lib.types.attrsOf userSubmodule;
+    default = { };
+    description = "User accounts configuration. Set enable=true for users that should exist on this system.";
+  };
 
   options.athenix = {
     forUser = lib.mkOption {
@@ -25,14 +156,28 @@
       default = null;
       description = ''
         Convenience option to configure a host for a specific user.
-        Automatically enables the user (sets athenix.users.username.enable = true).
+
-        Value should be a username from athenix.users.accounts.
+        When set, automatically:
+        - Enables the user account (athenix.users.<username>.enable = true)
+        - Sets as default WSL user (on WSL systems)
+
+        The username must exist in athenix.users (defined in users.nix).
       '';
+      example = "engr-ugaif";
     };
     host.useHostPrefix = lib.mkOption {
       type = lib.types.bool;
       default = true;
-      description = "Whether to prepend the host prefix to the hostname (used in inventory and hosts/default.nix).";
+      description = ''
+        Whether to prepend the hardware type prefix to the hostname.
+
+        When true:
+        - "nix-laptop" with device "1" → hostname "nix-laptop1"
+        - "nix-wsl" with device "alice" → hostname "nix-wsl-alice"
+
+        When false:
+        - Device name becomes the full hostname (useful for custom names)
+      '';
     };
   };
 

fleet/default.nix

@@ -2,6 +2,8 @@
   inputs,
   lib,
   config,
+  self ? null,
+  users ? { },
   ...
 }:
 
@@ -18,8 +20,6 @@ let
   # Import fleet-option.nix (defines athenix.fleet) and inventory.nix (sets values)
   # We use a minimal module here to avoid circular dependencies from common.nix's imports
 
-  hostTypes = config.athenix.hwTypes;
-
   # Helper to create a single NixOS system configuration
   mkHost =
     {
@@ -34,8 +34,20 @@ let
       externalModulePath =
         if externalModuleThunk != null then
           let
-            # Force evaluation of the thunk (fetchGit, fetchTarball, etc.)
+            # Force evaluation of the thunk
-            fetchedPath = externalModuleThunk;
+            fetchedPath =
+              if
+                builtins.isAttrs externalModuleThunk
+                && externalModuleThunk ? _type
+                && externalModuleThunk._type == "lazy-fetchGit"
+              then
+                # New format: lazy fetchGit - only execute when needed
+                (builtins.fetchGit {
+                  inherit (externalModuleThunk) url rev submodules;
+                }).outPath
+              else
+                # Legacy: pre-fetched derivation or path
+                externalModuleThunk;
             # Extract outPath from fetchGit/fetchTarball results
             extractedPath =
               if builtins.isAttrs fetchedPath && fetchedPath ? outPath then fetchedPath.outPath else fetchedPath;
@@ -59,10 +71,19 @@ let
           name: user:
           if (user ? external && user.external != null) then
             let
+              # Resolve external path (lazy fetchGit if needed)
               externalPath =
-                if builtins.isAttrs user.external && user.external ? outPath then
+                if builtins.isAttrs user.external && user.external ? url && user.external ? rev then
+                  # New format: lazy fetchGit
+                  (builtins.fetchGit {
+                    inherit (user.external) url rev;
+                    submodules = user.external.submodules or false;
+                  }).outPath
+                else if builtins.isAttrs user.external && user.external ? outPath then
+                  # Legacy: pre-fetched
                   user.external.outPath
                 else
+                  # Direct path
                   user.external;
               nixosModulePath = externalPath + "/nixos.nix";
             in
@@ -100,11 +121,6 @@ let
         }
       ) userNixosModulePaths;
 
-      # Get the host type module from the hostTypes attribute set
-      typeModule =
-        hostTypes.${hostType}
-          or (throw "Host type '${hostType}' not found. Available types: ${lib.concatStringsSep ", " (lib.attrNames hostTypes)}");
-
       # External module from fetchGit/fetchurl
       externalPathModule =
         if externalModulePath != null then import externalModulePath { inherit inputs; } else { };
@@ -132,20 +148,35 @@ let
           ];
         };
 
+      # Hardware-specific external modules
+      hwSpecificModules =
+        lib.optional (hostType == "nix-lxc")
+          "${inputs.nixpkgs.legacyPackages.${system}.path}/nixos/modules/virtualisation/proxmox-lxc.nix";
+
       allModules =
         userNixosModules
         ++ [
           ./common.nix
-          typeModule
           overrideModule
           { networking.hostName = hostName; }
+          # Set athenix.host.name for secrets and other modules to use
+          { athenix.host.name = hostName; }
+          {
+            # Inject user definitions from flake-parts level
+            config.athenix.users = lib.mapAttrs (_: user: lib.mapAttrs (_: lib.mkDefault) user) users;
+          }
+          # Enable the appropriate hardware module based on hostType
+          { config.athenix.hw.${hostType}.enable = lib.mkDefault true; }
         ]
+        ++ hwSpecificModules
         ++ lib.optional (externalModulePath != null) externalPathModule;
     in
     {
       system = lib.nixosSystem {
         inherit system;
-        specialArgs = { inherit inputs; };
+        specialArgs = {
+          inputs = if self != null then inputs // { inherit self; } else inputs;
+        };
         modules = allModules;
       };
       modules = allModules;
@@ -157,8 +188,6 @@ let
     let
       hostType = config.type or prefix;
       system = config.system or "x86_64-linux";
-      devices = config.devices or { };
-      hasCount = config ? count;
 
       # Helper to generate hostname from prefix and suffix
       # Numbers get no dash: "nix-surface1", "nix-surface2"
@@ -199,8 +228,24 @@ let
             # Check if deviceConfig has an 'external' field for lazy evaluation
             hasExternalField = builtins.isAttrs deviceConfig && deviceConfig ? external;
 
-            # Extract external module thunk if present (don't evaluate yet!)
+            # Extract external module spec (don't evaluate fetchGit yet!)
-            externalModuleThunk = if hasExternalField then deviceConfig.external else null;
+            externalModuleThunk =
+              if hasExternalField then
+                let
+                  ext = deviceConfig.external;
+                in
+                # New format: { url, rev, submodules? } - create lazy fetchGit thunk
+                if builtins.isAttrs ext && ext ? url && ext ? rev then
+                  {
+                    _type = "lazy-fetchGit";
+                    inherit (ext) url rev;
+                    submodules = ext.submodules or false;
+                  }
+                # Legacy: pre-fetched or path
+                else
+                  ext
+              else
+                null;
 
             # Remove 'external' from config to avoid conflicts
             cleanDeviceConfig =

fleet/fleet-option.nix

@@ -1,8 +1,8 @@
 # ============================================================================
 # Fleet Option Definition
 # ============================================================================
-# This module only defines the athenix.fleet option without any dependencies.
+# This module defines the athenix.fleet and athenix.hwTypes options.
-# Used by fleet/default.nix to evaluate inventory data without circular dependencies.
+# Self-contained fleet management without dependencies on user configuration.
 { inputs, lib, ... }:
 let
   fleetDefinition = lib.mkOption {
@@ -31,7 +31,7 @@ let
                 lib.types.int
                 (lib.types.attrsOf (
                   lib.types.submodule (
-                    { name, ... }:
+                    { ... }:
                     {
                       freeformType = lib.types.attrs;
                     }
@@ -59,66 +59,118 @@ let
       )
     );
   };
-  # Submodule defining the structure of a user account
+
+  # Forward declaration for user options (full definition in user-config.nix)
+  # This allows users.nix to be evaluated at flake level
   userSubmodule = lib.types.submodule {
     options = {
+      enable = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = "Whether this user account is enabled on this system.";
+      };
       isNormalUser = lib.mkOption {
         type = lib.types.bool;
         default = true;
+        description = "Whether this is a normal user account (vs system user).";
       };
       description = lib.mkOption {
         type = lib.types.nullOr lib.types.str;
         default = null;
+        description = "Full name or description of the user (GECOS field).";
+        example = "John Doe";
       };
       extraGroups = lib.mkOption {
         type = lib.types.listOf lib.types.str;
         default = [ ];
+        description = "Additional groups for the user (wheel, docker, etc.).";
+        example = [
+          "wheel"
+          "networkmanager"
+          "docker"
+        ];
       };
       hashedPassword = lib.mkOption {
         type = lib.types.str;
         default = "!";
+        description = ''
+          Hashed password for the user account.
+          Generate with: mkpasswd -m sha-512
+          Default "!" means account is locked (SSH key only).
+        '';
       };
       extraPackages = lib.mkOption {
         type = lib.types.listOf lib.types.package;
         default = [ ];
+        description = "Additional system packages available to this user.";
+        example = lib.literalExpression "[ pkgs.vim pkgs.git ]";
       };
       excludePackages = lib.mkOption {
         type = lib.types.listOf lib.types.package;
         default = [ ];
+        description = "System packages to exclude for this user.";
       };
       homePackages = lib.mkOption {
         type = lib.types.listOf lib.types.package;
         default = [ ];
+        description = "Packages to install in the user's home-manager profile.";
+        example = lib.literalExpression "[ pkgs.firefox pkgs.vscode ]";
       };
       extraImports = lib.mkOption {
         type = lib.types.listOf lib.types.path;
         default = [ ];
+        description = "Additional home-manager modules to import for this user.";
       };
       external = lib.mkOption {
         type = lib.types.nullOr (
           lib.types.oneOf [
             lib.types.path
-            lib.types.package
+            (lib.types.submodule {
-            lib.types.attrs
+              options = {
+                url = lib.mkOption {
+                  type = lib.types.str;
+                  description = "Git repository URL to fetch user configuration from.";
+                  example = "https://github.com/username/dotfiles";
+                };
+                rev = lib.mkOption {
+                  type = lib.types.str;
+                  description = "Git commit hash, tag, or branch to fetch.";
+                  example = "abc123def456...";
+                };
+                submodules = lib.mkOption {
+                  type = lib.types.bool;
+                  default = false;
+                  description = "Whether to fetch Git submodules.";
+                };
+              };
+            })
           ]
         );
         default = null;
         description = ''
-          External user configuration module. Can be:
+          External user configuration module from Git or local path.
-          - A path to a local module directory
-          - A fetchGit/fetchTarball result pointing to a repository
 
-          The external module can contain:
+          Can be either:
-          - user.nix (optional): Sets athenix.users.<name> options AND home-manager config
+          - A local path: /path/to/config
-          - nixos.nix (optional): System-level NixOS configuration
+          - A Git repository: { url = "..."; rev = "..."; submodules? = false; }
 
-          Example: builtins.fetchGit { url = "https://github.com/user/dotfiles"; rev = "..."; }
+          The Git repository is only fetched when the user is actually enabled.
+
+          Should contain user.nix (user options + home-manager config)
+          and optionally nixos.nix (system-level config).
         '';
+        example = lib.literalExpression ''
+          {
+                    url = "https://github.com/username/dotfiles";
+                    rev = "abc123def456789abcdef0123456789abcdef012";
+                    submodules = false;
+                  }'';
       };
       opensshKeys = lib.mkOption {
         type = lib.types.listOf lib.types.str;
         default = [ ];
-        description = "List of SSH public keys for the user.";
+        description = "SSH public keys for the user (authorized_keys).";
+        example = [ "ssh-ed25519 AAAAC3Nza... user@host" ];
       };
       shell = lib.mkOption {
         type = lib.types.nullOr (
@@ -130,7 +182,7 @@ let
           ]
         );
         default = "bash";
-        description = "The shell for this user.";
+        description = "Default shell for the user.";
       };
       editor = lib.mkOption {
         type = lib.types.nullOr (
@@ -143,23 +195,18 @@ let
           ]
         );
         default = "neovim";
-        description = "The default editor for this user.";
+        description = "Default text editor for the user (sets EDITOR).";
       };
       useZshTheme = lib.mkOption {
         type = lib.types.bool;
         default = true;
-        description = "Whether to apply the system Zsh theme.";
+        description = "Whether to apply the system Zsh theme (Oh My Posh).";
       };
       useNvimPlugins = lib.mkOption {
         type = lib.types.bool;
         default = true;
         description = "Whether to apply the system Neovim configuration.";
       };
-      enable = lib.mkOption {
-        type = lib.types.bool;
-        default = false;
-        description = "Whether this user account is enabled on this system.";
-      };
     };
   };
 in
@@ -172,7 +219,6 @@ in
     };
     users = lib.mkOption {
       type = lib.types.attrsOf userSubmodule;
-      default = { };
       description = "User accounts configuration. Set enable=true for users that should exist on this system.";
     };
   };

fleet/fs.nix

@@ -4,38 +4,79 @@
 # This module defines:
 # - Disko partition layout (EFI, swap, root)
 # - Filesystem options (device, swap size)
+#
+# Only applies to systems with physical disk management needs
+# (not containers, not WSL, not systems without a configured device)
 
 { config, lib, ... }:
 
+let
+  cfg = config.athenix.host.filesystem;
+  # Only enable disk config if device is set and disko is enabled
+  hasDiskConfig = cfg.device != null && config.disko.enableConfig;
+in
 {
   options.athenix = {
-    host.filesystem = {
+    host = {
+      name = lib.mkOption {
+        type = lib.types.str;
+        description = ''
+          Fleet-assigned hostname for this system.
+          Used for secrets discovery and other host-specific configurations.
+        '';
+      };
+      filesystem = {
         device = lib.mkOption {
           type = lib.types.nullOr lib.types.str;
           default = null;
-        description = "The main disk device to use for installation.";
+          description = ''
+            The main disk device to use for automated partitioning and installation.
+
+            When set, enables disko for declarative disk management with:
+            - 1GB EFI boot partition
+            - Optional swap partition (see swapSize)
+            - Root partition using remaining space
+
+            Leave null for systems that don't need disk partitioning (containers, WSL).
+          '';
+          example = "/dev/nvme0n1";
         };
         useSwap = lib.mkOption {
           type = lib.types.bool;
           default = true;
-        description = "Whether to create and use a swap partition.";
+          description = ''
+            Whether to create and use a swap partition.
+            Disable for systems with ample RAM or SSDs where swap is undesirable.
+          '';
         };
         swapSize = lib.mkOption {
           type = lib.types.nullOr lib.types.str;
           default = null;
-        description = "The size of the swap partition.";
+          description = ''
+            Size of the swap partition (e.g., "16G", "32G").
+
+            Recommended sizes:
+            - 8-16GB for desktops with 16GB+ RAM
+            - 32GB for laptops (enables hibernation)
+            - Match RAM size for systems <8GB RAM
+          '';
+          example = "32G";
+        };
       };
     };
   };
 
-  config = {
+  config = lib.mkMerge [
+    {
       # ========== Disk Partitioning (Disko) ==========
-    disko.enableConfig = lib.mkDefault (config.athenix.host.filesystem.device != null);
+      disko.enableConfig = lib.mkDefault (cfg.device != null);
+    }
 
+    (lib.mkIf hasDiskConfig {
       disko.devices = {
         disk.main = {
           type = "disk";
-        device = config.athenix.host.filesystem.device;
+          device = cfg.device;
           content = {
             type = "gpt";
             partitions = {
@@ -58,10 +99,10 @@
               };
 
               # Swap Partition (size configurable per host)
-            swap = lib.mkIf config.athenix.host.filesystem.useSwap {
+              swap = lib.mkIf cfg.useSwap {
                 name = "swap";
                 label = "swap";
-              size = config.athenix.host.filesystem.swapSize;
+                size = cfg.swapSize;
                 content = {
                   type = "swap";
                 };
@@ -86,5 +127,6 @@
           };
         };
       };
-  };
+    })
+  ];
 }

fleet/user-config.nix

@@ -9,18 +9,25 @@
 # ============================================================================
 # User Configuration Module
 # ============================================================================
-# This module defines the schema for user accounts and handles their creation.
+# This module implements user account creation and home-manager setup.
-# It bridges the gap between the data in 'users.nix' and the actual NixOS
+# Options are defined in fleet-option.nix for early availability.
-# and Home Manager configuration.
 
 let
-  # Helper: Resolve external module path from fetchGit/fetchTarball/path
+  # Helper: Resolve external module path (with lazy Git fetching)
   resolveExternalPath =
     external:
     if external == null then
       null
+    # New format: { url, rev, submodules? } - only fetch when needed
+    else if builtins.isAttrs external && external ? url && external ? rev then
+      (builtins.fetchGit {
+        inherit (external) url rev;
+        submodules = external.submodules or false;
+      }).outPath
+    # Legacy: pre-fetched derivation/package
     else if builtins.isAttrs external && external ? outPath then
       external.outPath
+    # Direct path
     else
       external;
 
@@ -33,6 +40,7 @@ let
 in
 {
   config = {
+
     # Generate NixOS users
     users.users =
       let
@@ -52,23 +60,15 @@ in
           };
         in
         rec {
-          inherit (user) isNormalUser extraGroups hashedPassword;
+          isNormalUser = user.isNormalUser;
+          inherit (user) extraGroups hashedPassword;
           description = if user.description != null then user.description else lib.mkDefault "";
           openssh.authorizedKeys.keys = user.opensshKeys;
           shell = if user.shell != null then shells.${user.shell} else pkgs.bash;
           packages = finalPackages ++ [ shell ];
-          group = if user.isNormalUser then name else lib.mkDefault "root";
         }
       ) enabledAccounts;
 
-    # Generate user groups for normal users
-    users.groups =
-      let
-        enabledAccounts = lib.filterAttrs (_: user: user.enable) config.athenix.users;
-        normalUsers = lib.filterAttrs (_: user: user.isNormalUser) enabledAccounts;
-      in
-      lib.mapAttrs (_: _: { }) normalUsers;
-
     # Home Manager configs per user
     home-manager = {
       useGlobalPkgs = true;
@@ -133,7 +133,7 @@ in
 
               # Always set these required options
               home.username = name;
-              home.homeDirectory = if name == "root" then "/root" else "/home/${name}";
+              home.homeDirectory = lib.mkOverride 999 (if name == "root" then "/root" else "/home/${name}");
               home.stateVersion = "25.11";
               programs.${user.editor} = {
                 enable = true;

hw/nix-desktop.nix

@@ -10,11 +10,33 @@
   modulesPath,
   ...
 }:
+
+with lib;
+
+let
+  cfg = config.athenix.hw.nix-desktop;
+in
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
   ];
 
+  options.athenix.hw.nix-desktop = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable desktop workstation hardware configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "Desktop workstation hardware type configuration.";
+  };
+
+  config = mkIf cfg.enable {
+
     # ========== Boot Configuration ==========
 
     boot.initrd.availableKernelModules = [
@@ -46,5 +68,6 @@
 
     # ========== Software Profile ==========
     athenix.sw.enable = lib.mkDefault true;
-  athenix.sw.type = lib.mkDefault "desktop";
+    athenix.sw.desktop.enable = lib.mkDefault true;
+  };
 }

hw/nix-ephemeral.nix

@@ -11,11 +11,32 @@
   modulesPath,
   ...
 }:
+
+with lib;
+
+let
+  cfg = config.athenix.hw.nix-ephemeral;
+in
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
   ];
 
+  options.athenix.hw.nix-ephemeral = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable ephemeral/diskless system hardware configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "Ephemeral hardware type configuration.";
+  };
+
+  config = mkIf cfg.enable {
     # ========== Boot Configuration ==========
     boot.initrd.availableKernelModules = [
       "xhci_pci" # USB 3.0 support
@@ -62,5 +83,6 @@
     hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
 
     athenix.sw.enable = lib.mkDefault true;
-  athenix.sw.type = lib.mkDefault "stateless-kiosk";
+    athenix.sw.stateless-kiosk.enable = lib.mkDefault true;
+  };
 }

hw/nix-laptop.nix

@@ -10,11 +10,32 @@
   modulesPath,
   ...
 }:
+
+with lib;
+
+let
+  cfg = config.athenix.hw.nix-laptop;
+in
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
   ];
 
+  options.athenix.hw.nix-laptop = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable laptop hardware configuration with power management.";
+        };
+      };
+    };
+    default = { };
+    description = "Laptop hardware type configuration.";
+  };
+
+  config = mkIf cfg.enable {
     # ========== Boot Configuration ==========
 
     boot.initrd.availableKernelModules = [
@@ -59,5 +80,6 @@
     };
 
     athenix.sw.enable = lib.mkDefault true;
-  athenix.sw.type = lib.mkDefault "desktop";
+    athenix.sw.desktop.enable = lib.mkDefault true;
+  };
 }

hw/nix-lxc.nix

@@ -7,16 +7,30 @@
 {
   config,
   lib,
-  modulesPath,
-  inputs,
   ...
 }:
-{
-  imports = [
-    inputs.vscode-server.nixosModules.default
-    "${modulesPath}/virtualisation/proxmox-lxc.nix"
-  ];
 
+with lib;
+
+let
+  cfg = config.athenix.hw.nix-lxc;
+in
+{
+  options.athenix.hw.nix-lxc = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable Proxmox LXC container hardware configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "Proxmox LXC hardware type configuration.";
+  };
+
+  config = mkIf cfg.enable {
     # ========== Nix Configuration ==========
     nix.settings.trusted-users = [
       "root"
@@ -33,6 +47,9 @@
     disko.enableConfig = lib.mkForce false; # No disk management in container
     console.enable = true;
 
+    # Set timezone to fix /etc/localtime for Docker containers
+    time.timeZone = lib.mkDefault "America/New_York";
+
     # Allow getty to work in containers
     systemd.services."getty@".unitConfig.ConditionPathExists = [
       ""
@@ -57,5 +74,6 @@
     ];
 
     athenix.sw.enable = lib.mkDefault true;
-  athenix.sw.type = lib.mkDefault "headless";
+    athenix.sw.headless.enable = lib.mkDefault true;
+  };
 }

hw/nix-surface.nix

@@ -12,7 +12,11 @@
   inputs,
   ...
 }:
+
+with lib;
+
 let
+  cfg = config.athenix.hw.nix-surface;
   # Use older kernel version for better Surface Go compatibility
   refSystem = inputs.nixpkgs-old-kernel.lib.nixosSystem {
     system = pkgs.stdenv.hostPlatform.system;
@@ -26,6 +30,21 @@ in
     inputs.nixos-hardware.nixosModules.microsoft-surface-go
   ];
 
+  options.athenix.hw.nix-surface = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable Microsoft Surface tablet hardware configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "Microsoft Surface hardware type configuration.";
+  };
+
+  config = mkIf cfg.enable {
     # ========== Boot Configuration ==========
 
     boot.initrd.availableKernelModules = [
@@ -65,5 +84,6 @@ in
 
     # ========== Software Profile ==========
     athenix.sw.enable = lib.mkDefault true;
-  athenix.sw.type = lib.mkDefault "tablet-kiosk"; # Touch-optimized kiosk mode
+    athenix.sw.tablet-kiosk.enable = lib.mkDefault true; # Touch-optimized kiosk mode
+  };
 }

hw/nix-wsl.nix

@@ -7,23 +7,43 @@
 {
   lib,
   config,
-  inputs,
   ...
 }:
-{
-  imports = [
-    inputs.nixos-wsl.nixosModules.default
-    inputs.vscode-server.nixosModules.default
-  ];
 
-  # ========== Options ==========
+with lib;
+
+let
+  cfg = config.athenix.hw.nix-wsl;
+in
+{
+  options.athenix.hw.nix-wsl = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable Windows Subsystem for Linux hardware configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "WSL hardware type configuration.";
+  };
+
+  # WSL user option (at module level, not inside config)
   options.athenix.host.wsl.user = lib.mkOption {
     type = lib.types.str;
     default = "engr-ugaif";
-    description = "The default user to log in as in WSL.";
+    description = ''
+      The default user to automatically log in as when starting WSL.
+
+      This user must be enabled via athenix.users.<username>.enable = true.
+      Tip: Use athenix.forUser = "username" as a shortcut to set both.
+    '';
+    example = "alice";
   };
 
-  config = {
+  config = mkIf cfg.enable {
     # ========== WSL Configuration ==========
     wsl.enable = true;
     # Use forUser if set, otherwise fall back to wsl.user option
@@ -32,7 +52,7 @@
 
     # ========== Software Profile ==========
     athenix.sw.enable = lib.mkDefault true;
-    athenix.sw.type = lib.mkDefault "headless";
+    athenix.sw.headless.enable = lib.mkDefault true;
 
     # ========== Remote Development ==========
     services.vscode-server.enable = true;
@@ -49,5 +69,8 @@
     # Provide dummy values for required options from boot.nix
     athenix.host.filesystem.device = "/dev/null";
     athenix.host.filesystem.swapSize = "0G";
+
+    # WSL doesn't use installer ISOs
+    athenix.host.buildMethods = lib.mkDefault [ ];
   };
 }

hw/nix-zima.nix

@@ -10,11 +10,32 @@
   modulesPath,
   ...
 }:
+
+with lib;
+
+let
+  cfg = config.athenix.hw.nix-zima;
+in
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
   ];
 
+  options.athenix.hw.nix-zima = mkOption {
+    type = types.submodule {
+      options = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "Enable Zima-specific hardware configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "Zima hardware type configuration.";
+  };
+
+  config = mkIf cfg.enable {
     # ========== Boot Configuration ==========
 
     boot.initrd.availableKernelModules = [
@@ -45,5 +66,6 @@
 
     # ========== Software Profile ==========
     athenix.sw.enable = lib.mkDefault true;
-  athenix.sw.type = lib.mkDefault "desktop";
+    athenix.sw.desktop.enable = lib.mkDefault true;
+  };
 }

installer/artifacts.nix

@@ -3,6 +3,7 @@
   fleet,
   self,
   system,
+  users ? { },
 }:
 # This file defines the logic for generating various build artifacts (ISOs, Netboot, LXC, etc.)
 # It exports a set of packages that can be built using `nix build .#<artifact-name>`
@@ -29,6 +30,7 @@ let
           hostName
           targetSystemBuild
           diskoScript
+          users
           ;
         hostPlatform = system;
       };
@@ -46,6 +48,9 @@ let
       inherit system;
       specialArgs = { inherit inputs; };
       modules = fleet.modules.${hostName} ++ [
+        {
+          config.athenix.users = lib.mapAttrs (_: user: lib.mapAttrs (_: lib.mkDefault) user) users;
+        }
         {
           disko.enableConfig = lib.mkForce false;
           services.upower.enable = lib.mkForce false;
@@ -63,6 +68,9 @@ let
       specialArgs = { inherit inputs; };
       modules = fleet.modules.${hostName} ++ [
         "${nixpkgs}/nixos/modules/installer/netboot/netboot.nix"
+        {
+          config.athenix.users = lib.mapAttrs (_: user: lib.mapAttrs (_: lib.mkDefault) user) users;
+        }
         {
           disko.enableConfig = lib.mkForce false;
           services.upower.enable = lib.mkForce false;

installer/auto-install.nix

@@ -2,10 +2,7 @@
 # It is intended to be used in an installation ISO.
 # It expects `targetSystem` (the closure to install) and `diskoScript` (the partitioning script) to be passed as arguments.
 {
-  config,
-  lib,
   pkgs,
-  inputs,
   hostName,
   hostPlatform,
   targetSystemBuild,

installer/modules.nix

@@ -20,7 +20,7 @@ let
 in
 {
   # Software configuration module - main module with all athenix.sw options
-  # Use athenix.sw.type to select profile: "desktop", "tablet-kiosk", "headless", "stateless-kiosk"
+  # Use athenix.sw.<type>.enable to enable software profiles: desktop, tablet-kiosk, headless, stateless-kiosk, builders
   hw = hostTypes;
   sw =
     {

inventory.nix

@@ -45,7 +45,7 @@
 # External modules (instead of config):
 #   Device values can be a config attrset with an optional 'external' field:
 #   devices."hostname" = {
-#     external = builtins.fetchGit { ... };  # Lazy: only fetched when building this host
+#     external = { url = "..."; rev = "..."; submodules? = false; };  # Lazy: only fetched when building this host
 #     # ... additional config options
 #   };
 #   The external module will be imported and evaluated only when this specific host is built.
@@ -65,7 +65,7 @@
 #     devices."alice".athenix.forUser = "alice123";       # Sets up for user alice123
 #   };
 #   "external" = {
-#     devices."remote".external = builtins.fetchGit {     # External module via Git (lazy)
+#     devices."remote".external = { url = "..."; rev = "..."; };  # External module via Git (lazy)
 #       url = "https://github.com/example/config";
 #       rev = "e1ccd7cc3e709afe4f50b0627e1c4bde49165014";
 #     };
@@ -92,10 +92,10 @@
     nix-surface = {
       defaultCount = 3;
       devices = {
-        "1".athenix.sw.kioskUrl = "https://google.com";
+        "1".athenix.sw.tablet-kiosk.kioskUrl = "https://google.com";
       };
       overrides = {
-        athenix.sw.kioskUrl = "https://yahoo.com";
+        athenix.sw.tablet-kiosk.kioskUrl = "https://yahoo.com";
       };
     };
 
@@ -106,11 +106,10 @@
         "nix-builder" = {
           # Gitea Actions self-hosted runner configuration
           athenix.sw = {
-            type = [
+            headless.enable = true;
-              "headless"
+            builders = {
-              "builders"
+              enable = true;
-            ];
+              giteaRunner = {
-            builders.giteaRunner = {
                 enable = true;
                 url = "https://git.factory.uga.edu";
                 # Token file must be created manually at this path with a Gitea runner token
@@ -127,12 +126,12 @@
               };
             };
           };
-        "usda-dash".external = builtins.fetchGit {
-          url = "https://git.factory.uga.edu/MODEL/usda-dash-config.git";
-          rev = "dab32f5884895cead0fae28cb7d88d17951d0c12";
-          submodules = true;
         };
-        "usda-dash".athenix.users.engr-ugaif.enable = true;
+        "usda-dash".external = {
+          url = "https://git.factory.uga.edu/MODEL/usda-dash-config.git";
+          rev = "ce2700b0196e106f7c013bbcee851a5f96b146a3";
+          submodules = false;
+        };
       };
       overrides = {
         athenix.host.useHostPrefix = false;

lib/default.nix

@@ -1,4 +1,8 @@
-{ inputs }:
+{
+  lib,
+  ...
+}:
 {
   mkFleet = import ./mkFleet.nix;
+  macCaseBuilder = import ./macCaseBuilder.nix { inherit lib; };
 }

lib/macCaseBuilder.nix

@@ -0,0 +1,33 @@
+{ lib }:
+let
+  # Default MAC address to station number mapping
+  defaultHostmap = {
+    "00:e0:4c:46:0b:32" = "1";
+    "00:e0:4c:46:07:26" = "2";
+    "00:e0:4c:46:05:94" = "3";
+    "00:e0:4c:46:07:11" = "4";
+    "00:e0:4c:46:08:02" = "5";
+    "00:e0:4c:46:08:5c" = "6";
+  };
+
+  # macCaseBuilder: builds a shell case statement from a hostmap
+  # Parameters:
+  #   varName: the shell variable to assign
+  #   prefix: optional string to prepend to the value (default: "")
+  #   hostmap: optional attribute set to use (default: built-in hostmap)
+  #
+  # Example:
+  #   macCaseBuilder { varName = "STATION"; prefix = "nix-"; }
+  #   # Generates case statements like: 00:e0:4c:46:0b:32) STATION=nix-1 ;;
+  builder =
+    {
+      varName,
+      prefix ? "",
+      hostmap ? defaultHostmap,
+    }:
+    lib.concatStringsSep "\n" (
+      lib.mapAttrsToList (mac: val: "      ${mac}) ${varName}=${prefix}${val} ;;") hostmap
+    );
+in
+# Export the builder function with hostmap as an accessible attribute
+lib.setFunctionArgs builder { } // { hostmap = defaultHostmap; }

lib/mkFleet.nix

@@ -4,7 +4,15 @@
   inputs,
   lib,
   config,
+  self ? null,
+  users ? { },
 }:
 import ../fleet/default.nix {
-  inherit inputs lib config;
+  inherit
+    inputs
+    lib
+    config
+    self
+    users
+    ;
 }

parts/docs.nix

@@ -0,0 +1,194 @@
+# Documentation generation
+{
+  inputs,
+  self,
+  lib,
+  ...
+}:
+let
+  pkgs = inputs.nixpkgs.legacyPackages.x86_64-linux;
+
+  # Extract options from a sample configuration
+  getAthenixOptions =
+    configName:
+    let
+      nixosConfig = self.nixosConfigurations.${configName};
+      evaledOptions = nixosConfig.options;
+
+      # Filter to just athenix namespace
+      athenixOptions = evaledOptions.athenix or { };
+    in
+    athenixOptions;
+
+  # Generate wiki home page
+  wikiHome = pkgs.writeText "Home.md" ''
+    # Athenix - NixOS Fleet Management
+
+    Athenix is a NixOS configuration system for managing the UGA Innovation Factory's fleet of devices using Nix flakes and a custom configuration framework.
+
+    ## Quick Start
+
+    - [Configuration Options](Configuration-Options) - All available `athenix.*` options
+    - [User Guide](User-Configuration) - Setting up user accounts and dotfiles
+    - [Building](Building) - Creating installers and system images
+    - [Development](Development) - Contributing to Athenix
+
+    ## Features
+
+    - **Inventory-based fleet management** - Define entire device fleets in a single file
+    - **Multiple hardware types** - Desktops, laptops, Surface tablets, LXC containers, WSL
+    - **Flexible software configurations** - Desktop, headless, kiosk, and builder modes
+    - **External module support** - Load user dotfiles and system configs from Git repos
+    - **Declarative everything** - Reproducible builds with pinned dependencies
+
+    ## Software Types
+
+    Enable different system configurations:
+
+    - **desktop** - Full KDE Plasma 6 desktop environment
+    - **headless** - Minimal server/container configuration
+    - **tablet-kiosk** - Touch-optimized kiosk for Surface tablets
+    - **stateless-kiosk** - Diskless PXE boot kiosk
+    - **builders** - CI/CD build server with Gitea Actions runner
+
+    ## Hardware Types
+
+    - **nix-desktop** - Desktop workstations
+    - **nix-laptop** - Laptop computers
+    - **nix-surface** - Microsoft Surface Pro tablets
+    - **nix-lxc** - LXC containers (Proxmox)
+    - **nix-wsl** - Windows Subsystem for Linux
+    - **nix-ephemeral** - Stateless systems (PXE boot)
+
+    ## Documentation
+
+    Browse the documentation using the sidebar or start with:
+
+    - [README](README) - Repository overview and getting started
+    - [Configuration Options](Configuration-Options) - Complete option reference
+    - [Inventory Guide](Inventory) - Managing the device fleet
+    - [External Modules](External-Modules) - Using external configurations
+  '';
+
+  # Generate markdown documentation from options
+  optionsToMarkdown =
+    options:
+    pkgs.writeText "options.md" ''
+      # Configuration Options
+
+      This document describes all available configuration options in the Athenix namespace.
+
+      ## Quick Reference
+
+      - **athenix.sw** - Software configuration (desktop, headless, kiosk modes)
+      - **athenix.users** - User account management
+      - **athenix.host** - Host-specific settings (filesystem, build methods)
+      - **athenix.fleet** - Fleet inventory definitions
+      - **athenix.forUser** - Convenience option to enable a user
+      - **athenix.system.gc** - Garbage collection settings
+
+      ## Detailed Options
+
+      For detailed option information, use:
+      ```bash
+      # View all athenix options
+      nix eval .#nixosConfigurations.nix-desktop1.options.athenix --apply builtins.attrNames
+
+      # View specific option description
+      nix eval .#nixosConfigurations.nix-desktop1.options.athenix.sw.desktop.enable.description
+
+      # Export all options to JSON
+      nix build .#athenix-options
+      cat result | jq
+      ```
+
+      ## Software Types
+
+      Enable different system configurations:
+
+      - **desktop** - Full KDE Plasma desktop environment
+      - **headless** - Server/container configuration  
+      - **tablet-kiosk** - Touch-optimized kiosk for tablets
+      - **stateless-kiosk** - Diskless PXE boot kiosk
+      - **builders** - Build server with optional Gitea Actions runner
+
+      See the individual option descriptions for detailed information.
+    '';
+in
+{
+  perSystem =
+    { system, ... }:
+    lib.mkIf (system == "x86_64-linux") {
+      packages = {
+        # Generate option documentation in markdown
+        docs =
+          pkgs.runCommand "athenix-docs"
+            {
+              nativeBuildInputs = [ pkgs.jq ];
+            }
+            ''
+              mkdir -p $out
+
+              # Generate wiki home page
+              cat > $out/Home.md << 'EOF'
+              ${builtins.readFile wikiHome}
+              EOF
+
+              # Copy main README
+              cp ${../README.md} $out/README.md
+
+              # Copy documentation with wiki-friendly names
+              cp ${../docs/BUILDING.md} $out/Building.md
+              cp ${../docs/DEVELOPMENT.md} $out/Development.md
+              cp ${../docs/EXTERNAL_MODULES.md} $out/External-Modules.md
+              cp ${../docs/INVENTORY.md} $out/Inventory.md
+              cp ${../docs/NAMESPACE.md} $out/Namespace.md
+              cp ${../docs/USER_CONFIGURATION.md} $out/User-Configuration.md
+
+              # Generate options reference
+              cat > $out/Configuration-Options.md << 'EOF'
+              ${builtins.readFile (optionsToMarkdown (getAthenixOptions "nix-desktop1"))}
+              EOF
+
+              echo "Documentation generated in $out"
+            '';
+
+        # Extract just the athenix namespace options as JSON
+        athenix-options =
+          let
+            nixosConfig =
+              self.nixosConfigurations.nix-desktop1
+                or (builtins.head (builtins.attrValues self.nixosConfigurations));
+
+            # Recursively extract option information
+            extractOption =
+              opt:
+              if opt ? _type && opt._type == "option" then
+                {
+                  inherit (opt) description;
+                  type = opt.type.description or (opt.type.name or "unknown");
+                  default =
+                    if opt ? default then
+                      if builtins.isAttrs opt.default && opt.default ? _type then "<special>" else opt.default
+                    else
+                      null;
+                  example =
+                    if opt ? example then
+                      if builtins.isAttrs opt.example && opt.example ? _type then "<special>" else opt.example
+                    else
+                      null;
+                }
+              else if builtins.isAttrs opt then
+                lib.mapAttrs (name: value: extractOption value) (
+                  # Filter out internal attributes
+                  lib.filterAttrs (n: _: !lib.hasPrefix "_" n) opt
+                )
+              else
+                null;
+
+            athenixOpts = nixosConfig.options.athenix or { };
+          in
+          pkgs.writeText "athenix-options.json" (builtins.toJSON (extractOption athenixOpts));
+      };
+    };
+}

parts/lib.nix

@@ -1,5 +1,8 @@
 # Library functions for flake-parts
 { inputs, ... }:
 {
-  flake.lib = import ../lib { inherit inputs; };
+  flake.lib = import ../lib {
+    inherit inputs;
+    lib = inputs.nixpkgs.lib;
+  };
 }

parts/nixos-configurations.nix

@@ -3,7 +3,6 @@
   inputs,
   self,
   lib,
-  pkgs,
   config,
   ...
 }:
@@ -14,7 +13,16 @@
 
   flake.nixosConfigurations =
     let
-      fleet = self.lib.mkFleet { inherit inputs lib config; };
+      users = config.athenix.users;
+      fleet = self.lib.mkFleet {
+        inherit
+          inputs
+          lib
+          config
+          self
+          users
+          ;
+      };
     in
     fleet.nixosConfigurations;
 }

parts/packages.nix

@@ -12,13 +12,23 @@
     lib.mkIf (system == "x86_64-linux") {
       packages =
         let
-          fleet = self.lib.mkFleet { inherit inputs lib config; };
+          users = config.athenix.users;
+          fleet = self.lib.mkFleet {
+            inherit
+              inputs
+              lib
+              config
+              self
+              users
+              ;
+          };
           artifacts = import ../installer/artifacts.nix {
             inherit
               inputs
               fleet
               self
               system
+              users
               ;
           };
         in

parts/users.nix

@@ -1,7 +0,0 @@
-# Flake-parts wrapper for users.nix
-{ inputs, ... }:
-let
-  # Minimal pkgs just for shell paths - will be overridden in actual NixOS configs
-  pkgs = inputs.nixpkgs.legacyPackages.x86_64-linux;
-in
-import ../users.nix { inherit pkgs; }

secrets.nix

@@ -0,0 +1,187 @@
+# ============================================================================
+# Agenix Secret Recipients Configuration (Auto-Generated)
+# ============================================================================
+# This file automatically discovers hosts and their public keys from the
+# secrets/ directory structure and generates recipient configurations.
+#
+# Directory structure:
+#   secrets/{hostname}/*.pub  -> SSH/age public keys for that host
+#   secrets/global/*.pub      -> Keys accessible to all hosts
+#
+# Usage:
+#   ragenix -e secrets/global/example.age     # Edit/create secret
+#   ragenix -r                                # Re-key all secrets
+#
+# To add admin keys for editing secrets, create secrets/admins/*.pub files
+# with your personal age public keys (generated with: age-keygen)
+
+let
+  lib = builtins;
+
+  # Helper functions not in builtins
+  filterAttrs =
+    pred: set:
+    lib.listToAttrs (
+      lib.filter (item: pred item.name item.value) (
+        lib.map (name: {
+          inherit name;
+          value = set.${name};
+        }) (lib.attrNames set)
+      )
+    );
+
+  concatLists = lists: lib.foldl' (acc: list: acc ++ list) [ ] lists;
+
+  unique =
+    list:
+    let
+      go =
+        acc: remaining:
+        if remaining == [ ] then
+          acc
+        else if lib.elem (lib.head remaining) acc then
+          go acc (lib.tail remaining)
+        else
+          go (acc ++ [ (lib.head remaining) ]) (lib.tail remaining);
+    in
+    go [ ] list;
+
+  hasSuffix =
+    suffix: str:
+    let
+      lenStr = lib.stringLength str;
+      lenSuffix = lib.stringLength suffix;
+    in
+    lenStr >= lenSuffix && lib.substring (lenStr - lenSuffix) lenSuffix str == suffix;
+
+  nameValuePair = name: value: { inherit name value; };
+
+  secretsPath = ./secrets;
+
+  # Read all directories in secrets/
+  secretDirs = if lib.pathExists secretsPath then lib.readDir secretsPath else { };
+
+  # Filter to only directories (excludes files)
+  isDirectory = name: type: type == "directory";
+  directories = lib.filter (name: isDirectory name secretDirs.${name}) (lib.attrNames secretDirs);
+
+  # Read public keys from a directory and convert to age format
+  readHostKeys =
+    dirName:
+    let
+      dirPath = secretsPath + "/${dirName}";
+      files = if lib.pathExists dirPath then lib.readDir dirPath else { };
+
+      # Prefer .age.pub files (pre-converted), fall back to .pub files
+      agePubFiles = filterAttrs (name: type: type == "regular" && hasSuffix ".age.pub" name) files;
+
+      sshPubFiles = filterAttrs (
+        name: type: type == "regular" && hasSuffix ".pub" name && !(hasSuffix ".age.pub" name)
+      ) files;
+
+      # Read age public keys (already in correct format)
+      ageKeys = lib.map (
+        name:
+        let
+          content = lib.readFile (dirPath + "/${name}");
+          # Trim whitespace/newlines
+          trimmed = lib.replaceStrings [ "\n" " " "\r" "\t" ] [ "" "" "" "" ] content;
+        in
+        trimmed
+      ) (lib.attrNames agePubFiles);
+
+      # For SSH keys, just include them as-is (user needs to convert with ssh-to-age)
+      # Or they can run the update-age-keys.sh script
+      sshKeys =
+        if (lib.length (lib.attrNames sshPubFiles)) > 0 then
+          lib.trace "Warning: ${dirName} has unconverted SSH keys. Run secrets/update-age-keys.sh" [ ]
+        else
+          [ ];
+    in
+    lib.filter (k: k != null && k != "") (ageKeys ++ sshKeys);
+
+  # Build host key mappings: { hostname = [ "age1..." "age2..." ]; }
+  hostKeys = lib.listToAttrs (
+    lib.map (dir: nameValuePair dir (readHostKeys dir)) (
+      lib.filter (d: d != "global" && d != "admins") directories
+    )
+  );
+
+  # Global keys that all hosts can use
+  globalKeys = if lib.elem "global" directories then readHostKeys "global" else [ ];
+
+  # Admin keys for editing secrets
+  adminKeys = if lib.elem "admins" directories then readHostKeys "admins" else [ ];
+
+  # All host keys combined
+  allHostKeys = concatLists (lib.attrValues hostKeys);
+
+  # Find all .age files in the secrets directory
+  findSecrets =
+    dir:
+    let
+      dirPath = secretsPath + "/${dir}";
+      files = if lib.pathExists dirPath then lib.readDir dirPath else { };
+      ageFiles = filterAttrs (name: type: type == "regular" && hasSuffix ".age" name) files;
+    in
+    lib.map (name: "secrets/${dir}/${name}") (lib.attrNames ageFiles);
+
+  # Generate recipient list for a secret based on its location
+  getRecipients =
+    secretPath:
+    let
+      # Extract directory name from path: "secrets/nix-builder/foo.age" -> "nix-builder"
+      pathParts = lib.split "/" secretPath;
+      dirName = lib.elemAt pathParts 2;
+    in
+    if dirName == "global" then
+      # Global secrets: all hosts + admins
+      allHostKeys ++ globalKeys ++ adminKeys
+    else if hostKeys ? ${dirName} then
+      # Host-specific secrets: that host + global keys + admins
+      hostKeys.${dirName} ++ globalKeys ++ adminKeys
+    else
+      # Fallback: just admins
+      adminKeys;
+
+  # Find all secrets across all directories
+  allSecrets = concatLists (lib.map findSecrets directories);
+
+  # Generate the configuration
+  secretsConfig = lib.listToAttrs (
+    lib.map (
+      secretPath:
+      let
+        recipients = getRecipients secretPath;
+        # Remove duplicates and empty keys
+        uniqueRecipients = unique (lib.filter (k: k != null && k != "") recipients);
+      in
+      nameValuePair secretPath {
+        publicKeys = uniqueRecipients;
+      }
+    ) allSecrets
+  );
+
+  # Generate wildcard rules for each directory to allow creating new secrets
+  wildcardRules = lib.listToAttrs (
+    lib.concatMap (dir: [
+      # Match with and without .age extension for ragenix compatibility
+      (nameValuePair "secrets/${dir}/*" {
+        publicKeys =
+          let
+            recipients = getRecipients "secrets/${dir}/dummy.age";
+          in
+          unique (lib.filter (k: k != null && k != "") recipients);
+      })
+      (nameValuePair "secrets/${dir}/*.age" {
+        publicKeys =
+          let
+            recipients = getRecipients "secrets/${dir}/dummy.age";
+          in
+          unique (lib.filter (k: k != null && k != "") recipients);
+      })
+    ]) (lib.filter (d: d != "admins") directories)
+  );
+
+in
+secretsConfig // wildcardRules

secrets/DESIGN.md

@@ -0,0 +1,174 @@
+# Athenix Secrets System Design
+
+## Overview
+
+The Athenix secrets management system integrates ragenix (agenix) with automatic host discovery based on the repository's fleet inventory structure. It provides a seamless workflow for managing encrypted secrets across all systems.
+
+## Architecture
+
+### Auto-Discovery Module (`sw/secrets.nix`)
+
+**Purpose**: Automatically load and configure secrets at system deployment time.
+
+**Features**:
+- Discovers `.age` encrypted files from `secrets/` directories
+- Loads global secrets from `secrets/global/` on ALL systems
+- Loads host-specific secrets from `secrets/{hostname}/` on matching hosts
+- Auto-configures decryption keys based on `.pub` files in directories
+- Supports custom secret configuration via `default.nix` in each directory
+
+**Key Behaviors**:
+- Secrets are decrypted to `/run/agenix/{name}` at boot
+- Identity paths include: system SSH keys + global keys + host-specific keys
+- Host-specific secrets override global secrets with the same name
+
+### Dynamic Recipients Configuration (`secrets/secrets.nix`)
+
+**Purpose**: Generate ragenix recipient configuration from directory structure.
+
+**Features**:
+- Automatically discovers hosts from `secrets/` subdirectories
+- Reads age public keys from `.age.pub` files (converted from SSH keys)
+- Generates recipient lists based on secret location:
+  - `secrets/global/*.age` → ALL hosts + admins
+  - `secrets/{hostname}/*.age` → that host + global keys + admins
+- Supports admin keys in `secrets/admins/` for secret editing
+
+**Key Behaviors**:
+- No manual recipient list maintenance required
+- Adding a new host = create directory + add .pub key + run `update-age-keys.sh`
+- Works with ragenix CLI: `ragenix -e`, `ragenix -r`
+
+## Workflow
+
+### Adding a New Host
+
+1. **Capture SSH host key**:
+   ```bash
+   # From the running system
+   cat /etc/ssh/ssh_host_ed25519_key.pub > secrets/new-host/ssh_host_ed25519_key.pub
+   ```
+
+2. **Convert to age format**:
+   ```bash
+   cd secrets/
+   ./update-age-keys.sh
+   ```
+
+3. **Re-key existing secrets** (if needed):
+   ```bash
+   ragenix -r
+   ```
+
+### Creating a New Secret
+
+1. **Choose location**:
+   - `secrets/global/` → all systems can decrypt
+   - `secrets/{hostname}/` → only that host can decrypt
+
+2. **Create/edit secret**:
+   ```bash
+   ragenix -e secrets/global/my-secret.age
+   ```
+   
+3. **Recipients are auto-determined** from `secrets.nix`:
+   - Global secrets: all host keys + admin keys
+   - Host-specific: that host + global keys + admin keys
+
+### Cross-Host Secret Management
+
+Any Athenix host can manage secrets for other hosts because:
+- All public keys are in the repository (`*.age.pub` files)
+- `secrets/secrets.nix` auto-generates recipient lists
+- Hosts decrypt using their own private keys (not shared)
+
+Example: From `nix-builder`, create a secret for `usda-dash`:
+```bash
+ragenix -e secrets/usda-dash/database-password.age
+# Encrypted for usda-dash's public key + admins
+# usda-dash will decrypt using its private key at /etc/ssh/ssh_host_ed25519_key
+```
+
+## Directory Structure
+
+```
+secrets/
+├── secrets.nix              # Auto-generated recipient config
+├── update-age-keys.sh       # Helper to convert SSH → age keys
+├── README.md                # User documentation
+├── DESIGN.md                # This file
+│
+├── global/                  # Secrets for ALL hosts
+│   ├── *.pub                # SSH public keys
+│   ├── *.age.pub            # Age public keys (generated)
+│   ├── *.age                # Encrypted secrets
+│   └── default.nix          # Optional: custom secret config
+│
+├── {hostname}/              # Host-specific secrets
+│   ├── *.pub
+│   ├── *.age.pub
+│   ├── *.age
+│   └── default.nix
+│
+└── admins/                  # Admin keys for editing
+    └── *.age.pub
+```
+
+## Security Model
+
+1. **Public keys in git**: Safe to commit (only public keys, `.age.pub` and `.pub`)
+2. **Private keys on hosts**: Never leave the system (`/etc/ssh/ssh_host_*_key`, `/etc/age/identity.key`)
+3. **Encrypted secrets in git**: Safe to commit (`.age` files)
+4. **Decrypted secrets**: Only in memory/tmpfs (`/run/agenix/*`)
+
+## Integration Points
+
+### With NixOS Configuration
+
+```nix
+# Access decrypted secrets in any NixOS module
+config.age.secrets.my-secret.path  # => /run/agenix/my-secret
+
+# Example usage
+services.myapp.passwordFile = config.age.secrets.database-password.path;
+```
+
+### With Inventory System
+
+The system automatically matches `secrets/{hostname}/` to hostnames from `inventory.nix`. No manual configuration needed.
+
+### With External Modules
+
+External user/system modules can reference secrets:
+```nix
+# In external module
+{ config, ... }:
+{
+  programs.git.extraConfig.credential.helper = 
+    "store --file ${config.age.secrets.git-credentials.path}";
+}
+```
+
+## Advantages
+
+1. **Zero manual recipient management**: Just add directories and keys
+2. **Cross-host secret creation**: Any host can manage secrets for others
+3. **Automatic host discovery**: Syncs with inventory structure
+4. **Flexible permission model**: Global vs host-specific + custom configs
+5. **Version controlled**: All public data in git, auditable history
+6. **Secure by default**: Private keys never shared, secrets encrypted at rest
+
+## Limitations
+
+1. **Requires age key conversion**: SSH keys must be converted to age format (automated by script)
+2. **Bootstrap chicken-egg**: Need initial host key before encrypting secrets (capture from first boot or generate locally)
+3. **No secret rotation automation**: Must manually re-key with `ragenix -r`
+4. **Git history contains old encrypted versions**: Rotating keys doesn't remove old ciphertexts from history
+
+## Future Enhancements
+
+- Auto-run `update-age-keys.sh` in pre-commit hook
+- Integrate with inventory.nix to auto-generate host directories
+- Support for multiple identity types per host
+- Automated secret rotation scheduling
+- Integration with hardware security modules (YubiKey, etc.)

secrets/README.md

@@ -0,0 +1,250 @@
+# Secrets Management with Agenix
+
+This directory contains age-encrypted secrets for Athenix hosts. Secrets are automatically loaded based on directory structure.
+
+## Directory Structure
+
+```
+secrets/
+├── global/              # Secrets installed on ALL systems
+│   ├── default.nix      # Optional: Custom config for global secrets
+│   └── example.age      # Decrypted to /run/agenix/example on all hosts
+├── nix-builder/         # Secrets only for nix-builder host
+│   ├── default.nix      # Optional: Custom config for nix-builder secrets
+│   └── ssh_host_ed25519_key.age
+└── usda-dash/           # Secrets only for usda-dash host
+    └── ssh_host_ed25519_key.age
+```
+
+## How It Works
+
+1. **Global secrets** (`./secrets/global/*.age`) are installed on every system
+2. **Host-specific secrets** (`./secrets/{hostname}/*.age`) are only installed on matching hosts
+3. Only `.age` encrypted files are loaded; `.pub` public keys are ignored
+4. Secrets are decrypted at boot to `/run/agenix/{secret-name}` with mode `0400` and owner `root:root`
+5. **Custom configurations** can be defined in `default.nix` files within each directory
+
+## Creating Secrets
+
+### 1. Generate Age Keys
+
+For a new host, generate an age identity:
+```bash
+# On the target system
+mkdir -p /etc/age
+age-keygen -o /etc/age/identity.key
+chmod 600 /etc/age/identity.key
+```
+
+Or use SSH host keys (automatically done by Athenix):
+```bash
+# Get the age public key from SSH host key
+nix shell nixpkgs#ssh-to-age -c sh -c 'cat /etc/ssh/ssh_host_ed25519_key.pub | ssh-to-age'
+```
+
+### 2. Store Public Keys
+
+Save the public key to `secrets/{hostname}/` for reference:
+```bash
+# Example for nix-builder
+echo "age1..." > secrets/nix-builder/identity.pub
+```
+
+Or from SSH host key:
+```bash
+cat /etc/ssh/ssh_host_ed25519_key.pub > secrets/nix-builder/ssh_host_ed25519_key.pub
+```
+
+**Then convert SSH keys to age format:**
+```bash
+cd secrets/
+./update-age-keys.sh
+```
+
+This creates `.age.pub` files that `secrets.nix` uses for ragenix recipient configuration.
+
+### 3. Encrypt Secrets
+
+Encrypt a secret for specific hosts:
+```bash
+# For a single host
+age -r age1publickey... -o secrets/nix-builder/my-secret.age <<< "secret value"
+
+# For multiple hosts (recipient list)
+age -R recipients.txt -o secrets/global/shared-secret.age < plaintext-file
+
+# Using SSH public keys
+age -R secrets/nix-builder/ssh_host_ed25519_key.pub \
+    -o secrets/nix-builder/ssh_host_key.age < /etc/ssh/ssh_host_ed25519_key
+```
+
+### 4. Creating and Editing Secrets
+
+**For new secrets**, use the helper script (automatically determines recipients):
+
+```bash
+cd secrets/
+
+# Create a host-specific secret
+./create-secret.sh usda-dash/database-url.age <<< "postgresql://..."
+
+# Create a global secret
+echo "shared-api-key" | ./create-secret.sh global/api-key.age
+
+# From a file
+./create-secret.sh nix-builder/ssh-key.age < ~/.ssh/id_ed25519
+```
+
+The script automatically includes the correct recipients:
+- **Host-specific**: that host's keys + global keys + admin keys
+- **Global**: all host keys + admin keys
+
+**To edit existing secrets**, use `ragenix`:
+
+```bash
+# Install ragenix
+nix shell github:yaxitech/ragenix
+
+# Edit an existing secret (you must have a decryption key)
+ragenix -e secrets/global/existing-secret.age
+
+# Re-key all secrets after adding new hosts
+ragenix -r
+```
+
+**Why create with `age` first?** Ragenix requires the `.age` file to exist before editing. The `secrets/secrets.nix` configuration auto-discovers recipients from the directory structure, but ragenix doesn't support wildcard patterns for creating new files.
+
+**Recipient management** is automatic:
+- **Global secrets** (`secrets/global/*.age`): encrypted for ALL hosts + admins
+- **Host secrets** (`secrets/{hostname}/*.age`): encrypted for that host + global keys + admins
+- **Admin keys** from `secrets/admins/*.age.pub` allow editing from your workstation
+
+After creating new .age files with `age`, use `ragenix -r` to re-key all secrets with the updated recipient configuration.
+
+To add admin keys for editing secrets:
+```bash
+# Generate personal age key
+age-keygen -o ~/.config/age/personal.key
+
+# Extract public key and add to secrets
+grep "public key:" ~/.config/age/personal.key | cut -d: -f2 | tr -d ' ' > secrets/admins/your-name.age.pub
+```
+
+## Using Secrets in Configuration
+
+Secrets are automatically loaded. Reference them in your NixOS configuration:
+
+```nix
+# Example: Using a secret for a service
+services.myservice = {
+  enable = true;
+  passwordFile = config.age.secrets.my-password.path;  # /run/agenix/my-password
+};
+
+# Example: Setting up SSH host key from secret
+services.openssh = {
+  hostKeys = [{
+    path = config.age.secrets.ssh_host_ed25519_key.path;
+    type = "ed25519";
+  }];
+};
+```
+
+## Custom Secret Configuration
+
+For secrets needing custom permissions, use `athenix.sw.secrets.extraSecrets`:
+
+```nix
+# In inventory.nix or host config
+athenix.sw.secrets.extraSecrets = {
+  "nginx-cert" = {
+    file = ./secrets/custom/cert.age;
+    mode = "0440";
+    owner = "nginx";
+    group = "nginx";
+  };
+};
+```
+
+### Using default.nix in Secret Directories
+
+Alternatively, create a `default.nix` file in the secret directory to configure all secrets in that directory:
+
+```nix
+# secrets/global/default.nix
+{
+  "example" = {
+    mode = "0440";        # Custom file mode (default: "0400")
+    owner = "nginx";      # Custom owner (default: "root")
+    group = "nginx";      # Custom group (default: "root")
+    path = "/run/secrets/example";  # Custom path (default: /run/agenix/{name})
+  };
+  
+  "api-key" = {
+    mode = "0400";
+    owner = "myservice";
+    group = "myservice";
+  };
+}
+```
+
+The `default.nix` file should return an attribute set where:
+- **Keys** are secret names (without the `.age` extension)
+- **Values** are configuration objects with optional fields:
+  - `mode` - File permissions (string, e.g., `"0440"`)
+  - `owner` - File owner (string, e.g., `"nginx"`)
+  - `group` - File group (string, e.g., `"nginx"`)
+  - `path` - Custom installation path (string, e.g., `"/custom/path"`)
+  
+Secrets not listed in `default.nix` will use default settings.
+
+## Security Best Practices
+
+1. **Never commit unencrypted secrets** - Only `.age` and `.pub` files belong in this directory
+2. **Use host-specific secrets** when possible - Limit exposure by using hostname directories
+3. **Rotate secrets regularly** - Re-encrypt with new keys periodically
+4. **Backup age identity keys** - Store `/etc/age/identity.key` securely offline
+5. **Use SSH keys** - Leverage existing SSH host keys for age encryption when possible
+6. **Pin to commits** - When using external secrets modules, always use `rev = "commit-hash"`
+
+## Converting SSH Keys to Age Format
+
+```bash
+# Convert SSH public key to age public key
+nix shell nixpkgs#ssh-to-age -c ssh-to-age < secrets/nix-builder/ssh_host_ed25519_key.pub
+
+# Convert SSH private key to age identity (for editing secrets)
+nix shell nixpkgs#ssh-to-age -c ssh-to-age -private-key -i ~/.ssh/id_ed25519
+```
+
+## Disabling Automatic Secrets
+
+To disable automatic secret loading:
+
+```nix
+# In inventory.nix or host config
+athenix.sw.secrets.enable = false;
+```
+
+## Troubleshooting
+
+### Secret not found
+- Ensure the `.age` file exists in `secrets/global/` or `secrets/{hostname}/`
+- Check `hostname` matches directory name: `echo $HOSTNAME` on the target system
+- Run `nix flake check` to verify secrets are discovered
+
+### Permission denied
+- Verify secret permissions in `/run/agenix/`
+- Check if custom permissions are needed (use `extraSecrets`)
+- Ensure the service user/group has access to the secret file
+
+### Age decrypt failed
+- Verify the host's age identity exists: `ls -l /etc/age/identity.key`
+- Check that the secret was encrypted with the host's public key
+- Confirm SSH host key hasn't changed (would change derived age key)
+
+## References
+
+- [ragenix GitHub](https://github.com/yaxitech/ragenix)
+- [agenix upstream](https://github.com/ryantm/agenix)
+- [age encryption tool](https://age-encryption.org/)

secrets/admins/temp-admin.age.pub

@@ -0,0 +1 @@
+age14emzyraytqzmre58c452t07rtcj87cwqwmd9z3gj7upugtxk8s3sda5tju

secrets/create-secret.sh

@@ -0,0 +1,121 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Create a new age-encrypted secret with auto-determined recipients
+# Usage: ./create-secret.sh <path> [content]
+#   path: relative to secrets/ (e.g., "usda-dash/my-secret.age" or "global/shared.age")
+#   content: stdin if not provided
+
+SECRETS_DIR="$(cd "$(dirname "$0")" && pwd)"
+
+if [ $# -lt 1 ]; then
+    echo "Usage: $0 <path> [content]" >&2
+    echo "Examples:" >&2
+    echo "  $0 usda-dash/database-url.age <<< 'postgresql://...'" >&2
+    echo "  $0 global/api-key.age < secret-file.txt" >&2
+    echo "  echo 'secret' | $0 nix-builder/token.age" >&2
+    exit 1
+fi
+
+SECRET_PATH="$1"
+shift
+
+# Extract directory from path (e.g., "usda-dash/file.age" -> "usda-dash")
+SECRET_DIR="$(dirname "$SECRET_PATH")"
+SECRET_FILE="$(basename "$SECRET_PATH")"
+
+# Ensure .age extension
+if [[ ! "$SECRET_FILE" =~ \.age$ ]]; then
+    echo "Error: Secret file must have .age extension" >&2
+    exit 1
+fi
+
+TARGET_FILE="$SECRETS_DIR/$SECRET_PATH"
+
+# Ensure target directory exists
+mkdir -p "$(dirname "$TARGET_FILE")"
+
+# Collect recipient keys
+RECIPIENTS=()
+
+if [ "$SECRET_DIR" = "global" ]; then
+    echo "Creating global secret (encrypted for all hosts + admins)..." >&2
+    
+    # Add all host keys
+    for host_dir in "$SECRETS_DIR"/*/; do
+        host_name="$(basename "$host_dir")"
+        # Skip non-host directories
+        if [ "$host_name" = "admins" ] || [ "$host_name" = "global" ]; then
+            continue
+        fi
+        
+        # Add all .age.pub files from this host
+        while IFS= read -r -d '' key_file; do
+            RECIPIENTS+=("$key_file")
+        done < <(find "$host_dir" -maxdepth 1 -name "*.age.pub" -print0)
+    done
+    
+    # Add global keys
+    while IFS= read -r -d '' key_file; do
+        RECIPIENTS+=("$key_file")
+    done < <(find "$SECRETS_DIR/global" -maxdepth 1 -name "*.age.pub" -print0 2>/dev/null || true)
+    
+else
+    echo "Creating host-specific secret for $SECRET_DIR..." >&2
+    
+    # Check if host directory exists
+    if [ ! -d "$SECRETS_DIR/$SECRET_DIR" ]; then
+        echo "Error: Host directory $SECRET_DIR does not exist" >&2
+        echo "Create it first: mkdir -p secrets/$SECRET_DIR" >&2
+        exit 1
+    fi
+    
+    # Add this host's keys
+    while IFS= read -r -d '' key_file; do
+        RECIPIENTS+=("$key_file")
+    done < <(find "$SECRETS_DIR/$SECRET_DIR" -maxdepth 1 -name "*.age.pub" -print0)
+    
+    # Add global keys (so global hosts can also decrypt)
+    while IFS= read -r -d '' key_file; do
+        RECIPIENTS+=("$key_file")
+    done < <(find "$SECRETS_DIR/global" -maxdepth 1 -name "*.age.pub" -print0 2>/dev/null || true)
+fi
+
+# Add admin keys (for editing from workstations)
+if [ -d "$SECRETS_DIR/admins" ]; then
+    while IFS= read -r -d '' key_file; do
+        RECIPIENTS+=("$key_file")
+    done < <(find "$SECRETS_DIR/admins" -maxdepth 1 -name "*.age.pub" -print0 2>/dev/null || true)
+fi
+
+# Check if we have any recipients
+if [ ${#RECIPIENTS[@]} -eq 0 ]; then
+    echo "Error: No recipient keys found!" >&2
+    echo "Run ./update-age-keys.sh first to generate .age.pub files" >&2
+    exit 1
+fi
+
+echo "Found ${#RECIPIENTS[@]} recipient key(s):" >&2
+for key in "${RECIPIENTS[@]}"; do
+    echo "  - $(basename "$key")" >&2
+done
+
+# Create recipient list file (temporary)
+RECIPIENT_LIST=$(mktemp)
+trap "rm -f $RECIPIENT_LIST" EXIT
+
+for key in "${RECIPIENTS[@]}"; do
+    cat "$key" >> "$RECIPIENT_LIST"
+done
+
+# Encrypt the secret
+if [ $# -gt 0 ]; then
+    # Content provided as argument
+    echo "$@" | age -R "$RECIPIENT_LIST" -o "$TARGET_FILE"
+else
+    # Content from stdin
+    age -R "$RECIPIENT_LIST" -o "$TARGET_FILE"
+fi
+
+echo "✓ Created $TARGET_FILE" >&2
+echo "  Edit with: ragenix -e secrets/$SECRET_PATH" >&2

secrets/global/hunter_halloran_key.age.pub

@@ -0,0 +1 @@
+age1udmpqkedupd33gyut85ud3nvppydzeg04kkuneymkvxcjjej244s4v8xjc

secrets/nix-builder/default.nix

@@ -0,0 +1,10 @@
+# Host-specific secret configuration for nix-builder
+{
+  # SSH host key should be readable by sshd
+  ssh_host_ed25519_key = {
+    mode = "0600";
+    owner = "root";
+    group = "root";
+    path = "/etc/ssh/ssh_host_ed25519_key";
+  };
+}

secrets/nix-builder/ssh_host_ed25519_key.age.pub

@@ -0,0 +1 @@
+age1u5tczg2sx90n03uuz9h549f4h3h7sq5uehhqpampzs7vj8ew7y6s2mjwz0

secrets/secrets.nix

@@ -0,0 +1,176 @@
+# ============================================================================
+# Agenix Secret Recipients Configuration (Auto-Generated)
+# ============================================================================
+# This file automatically discovers hosts and their public keys from the
+# secrets/ directory structure and generates recipient configurations.
+#
+# Directory structure:
+#   secrets/{hostname}/*.pub  -> SSH/age public keys for that host
+#   secrets/global/*.pub      -> Keys accessible to all hosts
+#
+# Usage:
+#   ragenix -e secrets/global/example.age     # Edit/create secret
+#   ragenix -r                                # Re-key all secrets
+#
+# To add admin keys for editing secrets, create secrets/admins/*.pub files
+# with your personal age public keys (generated with: age-keygen)
+
+let
+  lib = builtins;
+
+  # Helper functions not in builtins
+  filterAttrs =
+    pred: set:
+    lib.listToAttrs (
+      lib.filter (item: pred item.name item.value) (
+        lib.map (name: {
+          inherit name;
+          value = set.${name};
+        }) (lib.attrNames set)
+      )
+    );
+
+  concatLists = lists: lib.foldl' (acc: list: acc ++ list) [ ] lists;
+
+  unique =
+    list:
+    let
+      go =
+        acc: remaining:
+        if remaining == [ ] then
+          acc
+        else if lib.elem (lib.head remaining) acc then
+          go acc (lib.tail remaining)
+        else
+          go (acc ++ [ (lib.head remaining) ]) (lib.tail remaining);
+    in
+    go [ ] list;
+
+  hasSuffix =
+    suffix: str:
+    let
+      lenStr = lib.stringLength str;
+      lenSuffix = lib.stringLength suffix;
+    in
+    lenStr >= lenSuffix && lib.substring (lenStr - lenSuffix) lenSuffix str == suffix;
+
+  nameValuePair = name: value: { inherit name value; };
+
+  secretsPath = ./secrets;
+
+  # Read all directories in secrets/
+  secretDirs = if lib.pathExists secretsPath then lib.readDir secretsPath else { };
+
+  # Filter to only directories (excludes files)
+  isDirectory = name: type: type == "directory";
+  directories = lib.filter (name: isDirectory name secretDirs.${name}) (lib.attrNames secretDirs);
+
+  # Read public keys from a directory and convert to age format
+  readHostKeys =
+    dirName:
+    let
+      dirPath = secretsPath + "/${dirName}";
+      files = if lib.pathExists dirPath then lib.readDir dirPath else { };
+
+      # Prefer .age.pub files (pre-converted), fall back to .pub files
+      agePubFiles = filterAttrs (name: type: type == "regular" && hasSuffix ".age.pub" name) files;
+
+      sshPubFiles = filterAttrs (
+        name: type: type == "regular" && hasSuffix ".pub" name && !(hasSuffix ".age.pub" name)
+      ) files;
+
+      # Read age public keys (already in correct format)
+      ageKeys = lib.map (
+        name:
+        let
+          content = lib.readFile (dirPath + "/${name}");
+          # Trim whitespace/newlines
+          trimmed = lib.replaceStrings [ "\n" " " "\r" "\t" ] [ "" "" "" "" ] content;
+        in
+        trimmed
+      ) (lib.attrNames agePubFiles);
+
+      # For SSH keys, just include them as-is (user needs to convert with ssh-to-age)
+      # Or they can run the update-age-keys.sh script
+      sshKeys =
+        if (lib.length (lib.attrNames sshPubFiles)) > 0 then
+          lib.trace "Warning: ${dirName} has unconverted SSH keys. Run secrets/update-age-keys.sh" [ ]
+        else
+          [ ];
+    in
+    lib.filter (k: k != null && k != "") (ageKeys ++ sshKeys);
+
+  # Build host key mappings: { hostname = [ "age1..." "age2..." ]; }
+  hostKeys = lib.listToAttrs (
+    lib.map (dir: nameValuePair dir (readHostKeys dir)) (
+      lib.filter (d: d != "global" && d != "admins") directories
+    )
+  );
+
+  # Global keys that all hosts can use
+  globalKeys = if lib.elem "global" directories then readHostKeys "global" else [ ];
+
+  # Admin keys for editing secrets
+  adminKeys = if lib.elem "admins" directories then readHostKeys "admins" else [ ];
+
+  # All host keys combined
+  allHostKeys = concatLists (lib.attrValues hostKeys);
+
+  # Find all .age files in the secrets directory
+  findSecrets =
+    dir:
+    let
+      dirPath = secretsPath + "/${dir}";
+      files = if lib.pathExists dirPath then lib.readDir dirPath else { };
+      ageFiles = filterAttrs (name: type: type == "regular" && hasSuffix ".age" name) files;
+    in
+    lib.map (name: "secrets/${dir}/${name}") (lib.attrNames ageFiles);
+
+  # Generate recipient list for a secret based on its location
+  getRecipients =
+    secretPath:
+    let
+      # Extract directory name from path: "secrets/nix-builder/foo.age" -> "nix-builder"
+      pathParts = lib.split "/" secretPath;
+      dirName = lib.elemAt pathParts 2;
+    in
+    if dirName == "global" then
+      # Global secrets: all hosts + admins
+      allHostKeys ++ globalKeys ++ adminKeys
+    else if hostKeys ? ${dirName} then
+      # Host-specific secrets: that host + global keys + admins
+      hostKeys.${dirName} ++ globalKeys ++ adminKeys
+    else
+      # Fallback: just admins
+      adminKeys;
+
+  # Find all secrets across all directories
+  allSecrets = concatLists (lib.map findSecrets directories);
+
+  # Generate the configuration
+  secretsConfig = lib.listToAttrs (
+    lib.map (
+      secretPath:
+      let
+        recipients = getRecipients secretPath;
+        # Remove duplicates and empty keys
+        uniqueRecipients = unique (lib.filter (k: k != null && k != "") recipients);
+      in
+      nameValuePair secretPath {
+        publicKeys = uniqueRecipients;
+      }
+    ) allSecrets
+  );
+
+in
+secretsConfig
+// {
+  # Export helper information for debugging
+  _meta = {
+    hostKeys = hostKeys;
+    globalKeys = globalKeys;
+    adminKeys = adminKeys;
+    allHostKeys = allHostKeys;
+    discoveredSecrets = allSecrets;
+  };
+}

secrets/update-age-keys.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+# ============================================================================
+# Update Age Keys from SSH Public Keys
+# ============================================================================
+# This script converts SSH public keys to age format for use with ragenix.
+# Run this after adding new SSH .pub files to create corresponding .age.pub files.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "Converting SSH public keys to age format..."
+
+# Find all .pub files that are SSH keys (not already .age.pub)
+find . -name "*.pub" -not -name "*.age.pub" -type f | while read -r pubkey; do
+    # Check if it's an SSH key
+    if grep -q "^ssh-" "$pubkey" 2>/dev/null || grep -q "^ecdsa-" "$pubkey" 2>/dev/null; then
+        age_key=$(nix shell nixpkgs#ssh-to-age -c ssh-to-age < "$pubkey" 2>/dev/null || true)
+        
+        if [ -n "$age_key" ]; then
+            # Create .age.pub file with the age key
+            age_file="${pubkey%.pub}.age.pub"
+            echo "$age_key" > "$age_file"
+            echo "✓ Converted: $pubkey -> $age_file"
+        else
+            echo "⚠ Skipped: $pubkey (conversion failed)"
+        fi
+    fi
+done
+
+echo ""
+echo "Done! Age public keys have been generated."
+echo "You can now use ragenix to manage secrets:"
+echo "  ragenix -e secrets/global/my-secret.age"
+echo "  ragenix -r  # Re-key all secrets with updated keys"

secrets/usda-dash/default.nix

@@ -0,0 +1,8 @@
+# Host-specific secret configuration for usda-dash
+{
+  usda-vision-azure-env = {
+    mode = "0600";
+    owner = "root";
+    group = "root";
+  };
+}

secrets/usda-dash/ssh_host_ed25519_key.age.pub

@@ -0,0 +1 @@
+age1lr24yvk7rdfh5wkle7h32jpxqxm2e8vk85mc4plv370u2sh4yfmszaaejx

secrets/usda-dash/ssh_host_ed25519_key.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHI73LOEK2RgfjhZWpryntlLbx0LouHrhQ6v0vZu4Etr root@usda-dash

sw/builders/default.nix

@@ -11,7 +11,108 @@
   ...
 }:
 
-lib.mkMerge [
+with lib;
+
+let
+  cfg = config.athenix.sw.builders;
+in
+{
+  options.athenix.sw.builders = mkOption {
+    type = lib.types.submodule {
+      options = {
+        enable = mkOption {
+          type = lib.types.bool;
+          default = false;
+          description = ''
+            Enable build server configuration.
+
+            Includes:
+            - SSH host keys for common Git servers (factory.uga.edu, github.com)
+            - Gitea Actions runner support (optional)
+            - Build tools and dependencies
+
+            Recommended for: CI/CD servers, build containers, development infrastructure
+          '';
+          example = true;
+        };
+
+        giteaRunner = mkOption {
+          type = lib.types.submodule {
+            options = {
+              enable = mkOption {
+                type = lib.types.bool;
+                default = false;
+                description = ''
+                  Enable Gitea Actions self-hosted runner.
+
+                  This runner will connect to a Gitea instance and execute CI/CD workflows.
+                  Requires manual setup of the token file before the service will start.
+                '';
+                example = true;
+              };
+
+              url = mkOption {
+                type = lib.types.str;
+                description = ''
+                  URL of the Gitea instance to connect to.
+                  This should be the base URL without any path components.
+                '';
+                example = "https://git.factory.uga.edu";
+              };
+
+              tokenFile = mkOption {
+                type = lib.types.path;
+                default = "/var/lib/gitea-runner-token";
+                description = ''
+                  Path to file containing Gitea runner registration token.
+
+                  To generate:
+                  1. Go to your Gitea repository settings
+                  2. Navigate to Actions > Runners
+                  3. Click "Create new Runner"
+                  4. Save the token to this file:
+                     echo "TOKEN=your-token-here" | sudo tee /var/lib/gitea-runner-token > /dev/null
+
+                  The service will not start until this file exists.
+                '';
+                example = "/var/secrets/gitea-runner-token";
+              };
+
+              extraLabels = mkOption {
+                type = lib.types.listOf lib.types.str;
+                default = [ ];
+                description = ''
+                  Additional labels to identify this runner in workflow files.
+                  Use labels to target specific runners for different job types.
+                '';
+                example = [
+                  "self-hosted"
+                  "nix"
+                  "x86_64-linux"
+                ];
+              };
+
+              name = mkOption {
+                type = lib.types.str;
+                default = "athenix";
+                description = ''
+                  Unique name for this runner instance.
+                  Shown in Gitea's runner list and logs.
+                '';
+                example = "nix-builder-1";
+              };
+            };
+          };
+          default = { };
+          description = "Gitea Actions runner configuration.";
+        };
+      };
+    };
+    default = { };
+    description = "Build server configuration (CI/CD, Gitea Actions).";
+  };
+
+  config = mkIf cfg.enable (mkMerge [
     (import ./programs.nix {
       inherit
         config
@@ -28,4 +129,5 @@ lib.mkMerge [
         inputs
         ;
     })
-]
+  ]);
+}

sw/builders/programs.nix

@@ -1,8 +1,6 @@
 {
   config,
   lib,
-  pkgs,
-  inputs,
   ...
 }:
 
@@ -10,7 +8,7 @@ with lib;
 
 let
   cfg = config.athenix.sw;
-  basePackages = with pkgs; [
+  basePackages = [
     # Build-related packages can be added here if needed
   ];
 in

sw/default.nix

@@ -10,19 +10,14 @@
 # Software Module Entry Point
 # ============================================================================
 # This module manages the software configuration for the system. It provides
-# options to select the system type ('desktop' or 'kiosk') and handles
+# enable options for each system type (desktop, headless, builders, etc.)
-# the conditional importation of the appropriate sub-modules.
+# that can be enabled independently or in combination. Each type is a proper
+# NixOS submodule with its own enable flag and type-specific options.
 
 with lib;
 
 let
   cfg = config.athenix.sw;
-
-  # Normalize type to always be a list
-  swTypes = if isList cfg.type then cfg.type else [ cfg.type ];
-
-  # Helper to check if a type is enabled
-  hasType = type: elem type swTypes;
 in
 {
   imports = [
@@ -31,98 +26,63 @@ in
     ./gc.nix
     ./updater.nix
     ./update-ref.nix
+    ./secrets.nix
+    ./desktop
+    ./headless
+    ./builders
+    ./tablet-kiosk
+    ./stateless-kiosk
     inputs.home-manager.nixosModules.home-manager
     inputs.agenix.nixosModules.default
     inputs.disko.nixosModules.disko
   ];
 
   options.athenix.sw = {
-    enable = mkEnableOption "Standard Workstation Configuration";
+    enable = mkOption {
-
+      type = lib.types.bool;
-    type = mkOption {
+      default = true;
-      type = types.oneOf [
-        (types.enum [
-          "desktop"
-          "tablet-kiosk"
-          "headless"
-          "stateless-kiosk"
-          "builders"
-        ])
-        (types.listOf (
-          types.enum [
-            "desktop"
-            "tablet-kiosk"
-            "headless"
-            "stateless-kiosk"
-            "builders"
-          ]
-        ))
-      ];
-      default = "desktop";
-      description = "Type(s) of system configuration. Can be a single type or a list of types to combine multiple configurations.";
-    };
-
-    extraPackages = mkOption {
-      type = types.listOf types.package;
-      default = [ ];
-      description = "Extra packages to install.";
-    };
-
-    excludePackages = mkOption {
-      type = types.listOf types.package;
-      default = [ ];
-      description = "Packages to exclude from the default list.";
-    };
-
-    kioskUrl = mkOption {
-      type = types.str;
-      default = "https://ha.factory.uga.edu";
-      description = "URL to open in Chromium kiosk mode.";
-    };
-
-    # Builders-specific options
-    builders = mkOption {
-      type = types.submodule {
-        options = {
-          giteaRunner = {
-            enable = mkEnableOption "Gitea Actions self-hosted runner";
-
-            url = mkOption {
-              type = types.str;
-              description = "Gitea instance URL for the runner";
-            };
-
-            tokenFile = mkOption {
-              type = types.path;
-              default = "/var/lib/gitea-runner-token";
       description = ''
-                Path to file containing Gitea runner token.
+        Enable standard workstation configuration with base packages.
-                Generate in Gitea repository settings under Actions > Runners.
+
-                The token must have runner registration access.
+        Provides:
+        - Base CLI tools (htop, git, binutils)
+        - Shell configuration (Zsh)
+        - Secret management (agenix)
+        - Oh My Posh shell theme
+
+        This is typically enabled automatically when any sw type is enabled.
       '';
     };
 
-            extraLabels = mkOption {
+    type = mkOption {
-              type = types.listOf types.str;
+      type = lib.types.nullOr (lib.types.either lib.types.str (lib.types.listOf lib.types.str));
+      default = null;
+      description = "DEPRECATED: Use athenix.sw.<type>.enable instead. Legacy type selection.";
+      visible = false;
+    };
+
+    extraPackages = mkOption {
+      type = lib.types.listOf lib.types.package;
       default = [ ];
-              description = "Extra labels to identify this runner in workflows";
+      description = ''
+        Additional system packages to install beyond the defaults.
+        These packages are added to environment.systemPackages.
+      '';
+      example = lib.literalExpression "[ pkgs.vim pkgs.wget pkgs.curl ]";
     };
 
-            name = mkOption {
+    excludePackages = mkOption {
-              type = types.str;
+      type = lib.types.listOf lib.types.package;
-              default = "athenix";
+      default = [ ];
-              description = "Name of the Gitea runner service";
+      description = ''
-            };
+        Packages to exclude from the default package list.
-          };
+        Useful for removing unwanted default packages.
-        };
+      '';
-      };
+      example = lib.literalExpression "[ pkgs.htop ]";
-      default = { };
-      description = "Builder-specific configuration options";
     };
   };
 
-  config = mkIf cfg.enable (mkMerge [
+  config = mkIf cfg.enable {
-    {
     # ========== System-Wide Configuration ==========
     nixpkgs.config.allowUnfree = true;
 
@@ -143,57 +103,5 @@ in
         age-plugin-fido2-hmac # age FIDO2 support
         inputs.agenix.packages.${stdenv.hostPlatform.system}.default # Secret management
       ];
-    }
+  };
-    # ========== Software Profile Imports ==========
-    (mkIf (hasType "desktop") (
-      import ./desktop {
-        inherit
-          config
-          lib
-          pkgs
-          inputs
-          ;
-      }
-    ))
-    (mkIf (hasType "tablet-kiosk") (
-      import ./tablet-kiosk {
-        inherit
-          config
-          lib
-          pkgs
-          inputs
-          ;
-      }
-    ))
-    (mkIf (hasType "headless") (
-      import ./headless {
-        inherit
-          config
-          lib
-          pkgs
-          inputs
-          ;
-      }
-    ))
-    (mkIf (hasType "stateless-kiosk") (
-      import ./stateless-kiosk {
-        inherit
-          config
-          lib
-          pkgs
-          inputs
-          ;
-      }
-    ))
-    (mkIf (hasType "builders") (
-      import ./builders {
-        inherit
-          config
-          lib
-          pkgs
-          inputs
-          ;
-      }
-    ))
-  ]);
 }

sw/desktop/default.nix

@@ -10,7 +10,41 @@
   inputs,
   ...
 }:
-lib.mkMerge [
+
+with lib;
+
+let
+  cfg = config.athenix.sw.desktop;
+in
+{
+  options.athenix.sw.desktop = mkOption {
+    type = lib.types.submodule {
+      options = {
+        enable = mkOption {
+          type = lib.types.bool;
+          default = false;
+          description = ''
+            Enable full desktop environment with KDE Plasma 6.
+
+            Includes:
+            - KDE Plasma 6 desktop with SDDM display manager
+            - Full graphical software suite (Firefox, Chromium, LibreOffice)
+            - Printing and scanning support (CUPS)
+            - Virtualization (libvirt, virt-manager)
+            - Bluetooth and audio (PipeWire)
+            - Video conferencing (Zoom, Teams)
+
+            Recommended for: Workstations, development machines, user desktops
+          '';
+          example = true;
+        };
+      };
+    };
+    default = { };
+    description = "Desktop environment configuration (KDE Plasma 6).";
+  };
+
+  config = mkIf cfg.enable (mkMerge [
     (import ./programs.nix {
       inherit
         config
@@ -27,4 +61,5 @@ lib.mkMerge [
         inputs
         ;
     })
-]
+  ]);
+}

sw/desktop/programs.nix

@@ -2,7 +2,6 @@
   config,
   lib,
   pkgs,
-  inputs,
   ...
 }:
 

sw/desktop/services.nix

@@ -1,5 +1,4 @@
 {
-  config,
   lib,
   pkgs,
   ...

sw/gc.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }:
 {
@@ -10,22 +9,40 @@
       enable = lib.mkOption {
         type = lib.types.bool;
         default = true;
-        description = "Whether to enable automatic garbage collection.";
+        description = ''
+          Enable automatic garbage collection of old NixOS generations.
+          Helps keep disk usage under control on long-running systems.
+        '';
       };
       frequency = lib.mkOption {
         type = lib.types.str;
         default = "weekly";
-        description = "How often to run garbage collection (systemd timer format).";
+        description = ''
+          How often to run garbage collection (systemd timer format).
+
+          Common values: "daily", "weekly", "monthly"
+          Advanced: "*-*-* 03:00:00" (daily at 3 AM)
+        '';
+        example = "daily";
       };
       retentionDays = lib.mkOption {
         type = lib.types.int;
         default = 30;
-        description = "Number of days to keep old generations before deletion.";
+        description = ''
+          Number of days to keep old system generations before deletion.
+
+          Older generations allow rolling back system changes.
+          Recommended: 30-90 days for workstations, 7-14 for servers.
+        '';
+        example = 60;
       };
       optimise = lib.mkOption {
         type = lib.types.bool;
         default = true;
-        description = "Whether to automatically optimize the Nix store.";
+        description = ''
+          Whether to automatically hard-link identical files in the Nix store.
+          Can save significant disk space but uses CPU during optimization.
+        '';
       };
     };
 

sw/ghostty.nix

@@ -12,7 +12,11 @@
 # It reconstructs the terminfo database from the provided definition and
 # adds it to the system packages.
 
+with lib;
+
 let
+  cfg = config.athenix.sw;
+
   ghostty-terminfo = pkgs.runCommand "ghostty-terminfo" { } ''
     mkdir -p $out/share/terminfo
     cat > ghostty.info <<'EOF'
@@ -101,5 +105,7 @@ let
   '';
 in
 {
+  config = mkIf cfg.enable {
     environment.systemPackages = [ ghostty-terminfo ];
+  };
 }

sw/headless/default.nix

@@ -11,7 +11,38 @@
   ...
 }:
 
-lib.mkMerge [
+with lib;
+
+let
+  cfg = config.athenix.sw.headless;
+in
+{
+  options.athenix.sw.headless = mkOption {
+    type = lib.types.submodule {
+      options = {
+        enable = mkOption {
+          type = lib.types.bool;
+          default = false;
+          description = ''
+            Enable minimal headless server configuration.
+
+            Includes:
+            - SSH server with password authentication
+            - Minimal CLI tools (tmux, man)
+            - Systemd-networkd for networking
+            - No graphical environment
+
+            Recommended for: Servers, containers (LXC), WSL, remote systems
+          '';
+          example = true;
+        };
+      };
+    };
+    default = { };
+    description = "Headless server configuration (SSH, minimal CLI tools).";
+  };
+
+  config = mkIf cfg.enable (mkMerge [
     (import ./programs.nix {
       inherit
         config
@@ -28,4 +59,5 @@ lib.mkMerge [
         inputs
         ;
     })
-]
+  ]);
+}

sw/headless/programs.nix

@@ -2,7 +2,6 @@
   config,
   lib,
   pkgs,
-  inputs,
   ...
 }:
 

sw/headless/services.nix

@@ -1,7 +1,4 @@
 {
-  config,
-  lib,
-  pkgs,
   ...
 }:
 

sw/python.nix

@@ -18,11 +18,28 @@ let
   cfg = config.athenix.sw.python;
 in
 {
-  options.athenix.sw.python = {
+  options.athenix.sw.python = lib.mkOption {
-    enable = mkEnableOption "Python development tools (pixi, uv)" // {
+    type = lib.types.submodule {
+      options = {
+        enable = lib.mkOption {
+          type = lib.types.bool;
           default = true;
+          description = ''
+            Enable Python development tools (pixi, uv).
+
+            Provides:
+            - pixi: Fast, cross-platform package manager for Python
+            - uv: Extremely fast Python package installer and resolver
+
+            These tools manage project-based dependencies rather than global
+            Python packages, avoiding conflicts and improving reproducibility.
+          '';
         };
       };
+    };
+    default = { };
+    description = "Python development environment configuration.";
+  };
 
   config = mkIf cfg.enable {
     environment.systemPackages = [

sw/secrets.nix

@@ -0,0 +1,230 @@
+# ============================================================================
+# Automatic Secret Management with Agenix
+# ============================================================================
+# This module automatically loads age-encrypted secrets from ./secrets based on
+# the hostname. Secrets are organized by directory:
+#   - ./secrets/global/          -> Installed on ALL systems
+#   - ./secrets/{hostname}/      -> Installed only on matching host
+#
+# Secret files should be .age encrypted files. Public keys (.pub) are ignored.
+
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.athenix.sw;
+  secretsPath = ../secrets;
+
+  # Get the fleet-assigned hostname (avoids issues with LXC empty hostnames)
+  hostname = config.athenix.host.name;
+
+  # Read all directories in ./secrets
+  secretDirs = if builtins.pathExists secretsPath then builtins.readDir secretsPath else { };
+
+  # Filter to only directories (excludes files)
+  isDirectory = name: type: type == "directory";
+  directories = lib.filterAttrs isDirectory secretDirs;
+
+  # Read secrets from a specific directory
+  readSecretsFromDir =
+    dirName:
+    let
+      dirPath = secretsPath + "/${dirName}";
+      files = builtins.readDir dirPath;
+
+      # Check if there's a default.nix with custom secret configurations
+      hasDefaultNix = files ? "default.nix";
+      customConfigs = if hasDefaultNix then import (dirPath + "/default.nix") else { };
+
+      # Only include .age files (exclude .pub public keys and other files)
+      secretFiles = lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".age" name) files;
+    in
+    lib.mapAttrs' (
+      name: _:
+      let
+        # Remove .age extension for the secret name
+        secretName = lib.removeSuffix ".age" name;
+
+        # Get custom config for this secret if defined
+        customConfig = customConfigs.${secretName} or { };
+
+        # Base configuration with file path
+        baseConfig = {
+          file = dirPath + "/${name}";
+        };
+      in
+      lib.nameValuePair secretName (baseConfig // customConfig)
+    ) secretFiles;
+
+  # Read public keys from a specific directory and map to private key paths
+  readIdentityPathsFromDir =
+    dirName:
+    let
+      dirPath = secretsPath + "/${dirName}";
+      files = if builtins.pathExists dirPath then builtins.readDir dirPath else { };
+      # Only include .pub public key files
+      pubKeyFiles = lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".pub" name) files;
+    in
+    lib.mapAttrsToList (
+      name: _:
+      let
+        # Map public key filename to expected private key location
+        baseName = lib.removeSuffix ".pub" name;
+        filePath = dirPath + "/${name}";
+        fileContent = builtins.readFile filePath;
+        # Check if it's an SSH key by looking at the content
+        isSSHKey = lib.hasPrefix "ssh-" fileContent || lib.hasPrefix "ecdsa-" fileContent;
+      in
+      if lib.hasPrefix "ssh_host_" name then
+        # SSH host keys: ssh_host_ed25519_key.pub -> /etc/ssh/ssh_host_ed25519_key
+        "/etc/ssh/${baseName}"
+      else if name == "identity.pub" then
+        # Standard age identity: identity.pub -> /etc/age/identity.key
+        "/etc/age/identity.key"
+      else if isSSHKey then
+        # Other SSH keys (user keys, etc.): hunter_halloran_key.pub -> /etc/ssh/hunter_halloran_key
+        "/etc/ssh/${baseName}"
+      else
+        # Generic age keys: key.pub -> /etc/age/key
+        "/etc/age/${baseName}"
+    ) pubKeyFiles;
+
+  # Determine which secrets apply to this host
+  applicableSecrets =
+    let
+      # Global secrets apply to all hosts
+      globalSecrets = if directories ? "global" then readSecretsFromDir "global" else { };
+
+      # Host-specific secrets
+      hostSecrets = if directories ? ${hostname} then readSecretsFromDir hostname else { };
+    in
+    globalSecrets // hostSecrets; # Host-specific secrets override global if same name
+
+  # Determine which identity paths (private keys) to use for decryption
+  identityPaths =
+    let
+      # Global identity paths (keys in global/ that all hosts can use)
+      globalPaths = if directories ? "global" then readIdentityPathsFromDir "global" else [ ];
+
+      # Host-specific identity paths
+      hostPaths = if directories ? ${hostname} then readIdentityPathsFromDir hostname else [ ];
+
+      # Default paths that NixOS/agenix use
+      defaultPaths = [
+        "/etc/ssh/ssh_host_rsa_key"
+        "/etc/ssh/ssh_host_ed25519_key"
+        "/etc/age/identity.key"
+      ];
+
+      # Combine all paths and remove duplicates
+      allPaths = lib.unique (defaultPaths ++ globalPaths ++ hostPaths);
+    in
+    allPaths;
+in
+{
+  options.athenix.sw.secrets = {
+    enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = ''
+        Enable automatic secret management using agenix.
+
+        Secrets are loaded from ./secrets based on directory structure:
+        - ./secrets/global/       -> All systems
+        - ./secrets/{hostname}/   -> Specific host only
+
+        Only .age encrypted files are loaded; .pub files are ignored.
+      '';
+    };
+
+    extraSecrets = mkOption {
+      type = types.attrsOf (
+        types.submodule {
+          options = {
+            file = mkOption {
+              type = types.path;
+              description = "Path to the encrypted secret file";
+            };
+            mode = mkOption {
+              type = types.str;
+              default = "0400";
+              description = "Permissions mode for the decrypted secret";
+            };
+            owner = mkOption {
+              type = types.str;
+              default = "root";
+              description = "Owner of the decrypted secret file";
+            };
+            group = mkOption {
+              type = types.str;
+              default = "root";
+              description = "Group of the decrypted secret file";
+            };
+          };
+        }
+      );
+      default = { };
+      description = ''
+        Additional secrets to define manually, beyond the auto-discovered ones.
+        Use this for secrets that need custom permissions or are stored elsewhere.
+      '';
+      example = lib.literalExpression ''
+        {
+          "my-secret" = {
+            file = ./secrets/custom/secret.age;
+            mode = "0440";
+            owner = "nginx";
+            group = "nginx";
+          };
+        }
+      '';
+    };
+  };
+
+  config = mkIf (cfg.enable && cfg.secrets.enable) {
+    # Auto-discovered secrets with default permissions
+    age.secrets = applicableSecrets // cfg.secrets.extraSecrets;
+
+    # Generate age identity files from SSH host keys at boot
+    # This is needed because age can't reliably use OpenSSH private keys directly
+    # Must run before agenix tries to decrypt secrets
+    system.activationScripts.convertSshToAge = {
+      deps = [
+        "users"
+        "groups"
+      ];
+      text = ''
+        mkdir -p /etc/age
+        if [ -f /etc/ssh/ssh_host_ed25519_key ]; then
+          ${pkgs.ssh-to-age}/bin/ssh-to-age -private-key -i /etc/ssh/ssh_host_ed25519_key > /etc/age/ssh_host_ed25519.age || true
+          chmod 600 /etc/age/ssh_host_ed25519.age 2>/dev/null || true
+        fi
+        if [ -f /etc/ssh/ssh_host_rsa_key ]; then
+          ${pkgs.ssh-to-age}/bin/ssh-to-age -private-key -i /etc/ssh/ssh_host_rsa_key > /etc/age/ssh_host_rsa.age 2>/dev/null || true
+          chmod 600 /etc/age/ssh_host_rsa.age 2>/dev/null || true
+        fi
+      '';
+    };
+
+    # Add the converted age keys to identity paths (in addition to auto-discovered ones)
+    age.identityPaths = identityPaths ++ [
+      "/etc/age/ssh_host_ed25519.age"
+      "/etc/age/ssh_host_rsa.age"
+    ];
+
+    # Optional: Add assertion to warn if no secrets found
+    warnings =
+      let
+        hasSecrets = (builtins.length (builtins.attrNames applicableSecrets)) > 0;
+      in
+      lib.optional (
+        !hasSecrets
+      ) "No age-encrypted secrets found in ./secrets/global/ or ./secrets/${hostname}/";
+  };
+}

sw/stateless-kiosk/default.nix

@@ -7,7 +7,52 @@
   inputs,
   ...
 }:
-lib.mkMerge [
+
+with lib;
+
+let
+  cfg = config.athenix.sw.stateless-kiosk;
+in
+{
+  options.athenix.sw.stateless-kiosk = mkOption {
+    type = lib.types.submodule {
+      options = {
+        enable = mkOption {
+          type = lib.types.bool;
+          default = false;
+          description = ''
+            Enable stateless kiosk mode for diskless PXE boot systems.
+
+            Includes:
+            - Sway (Wayland compositor)
+            - Chromium in fullscreen kiosk mode
+            - MAC address-based URL routing
+            - Network-only boot (no local storage)
+            - Auto-start browser on boot
+
+            Recommended for: Assembly line stations, diskless kiosks, PXE boot displays
+          '';
+          example = true;
+        };
+
+        kioskUrl = mkOption {
+          type = lib.types.str;
+          default = "https://ha.factory.uga.edu";
+          description = ''
+            Default URL to display in the kiosk browser.
+
+            Note: For stateless-kiosk, MAC address-based routing may override this.
+            See sw/stateless-kiosk/mac-hostmap.nix for MAC-to-URL mappings.
+          '';
+          example = "https://homeassistant.lan:8123/lovelace/dashboard";
+        };
+      };
+    };
+    default = { };
+    description = "Stateless kiosk configuration (PXE boot, Sway, MAC-based routing).";
+  };
+
+  config = mkIf cfg.enable (mkMerge [
     (import ./kiosk-browser.nix {
       inherit
         config
@@ -40,4 +85,5 @@ lib.mkMerge [
         inputs
         ;
     })
-]
+  ]);
+}

sw/stateless-kiosk/kiosk-browser.nix

@@ -1,14 +1,13 @@
 # This module configures Chromium for kiosk mode under Sway.
 # It includes a startup script that determines the kiosk URL based on the machine's MAC address.
 {
-  config,
-  lib,
   pkgs,
+  inputs,
   ...
 }:
 
 let
-  macCaseBuilder = (import ./mac-hostmap.nix { inherit lib; }).macCaseBuilder;
+  macCaseBuilder = inputs.self.lib.macCaseBuilder;
   macCases = macCaseBuilder {
     varName = "STATION";
   };

sw/stateless-kiosk/mac-hostmap.nix

@@ -1,28 +0,0 @@
-# Shared MAC address to station mapping and case builder for stateless-kiosk modules
-{ lib }:
-let
-  hostmap = {
-    "00:e0:4c:46:0b:32" = "1";
-    "00:e0:4c:46:07:26" = "2";
-    "00:e0:4c:46:05:94" = "3";
-    "00:e0:4c:46:07:11" = "4";
-    "00:e0:4c:46:08:02" = "5";
-    "00:e0:4c:46:08:5c" = "6";
-  };
-  # macCaseBuilder: builds a shell case statement from a hostmap
-  # varName: the shell variable to assign
-  # prefix: optional string to prepend to the value (default: "")
-  # attrset: attribute set to use (default: hostmap)
-  macCaseBuilder =
-    {
-      varName,
-      prefix ? "",
-      attrset ? hostmap,
-    }:
-    lib.concatStringsSep "\n" (
-      lib.mapAttrsToList (mac: val: "      ${mac}) ${varName}=${prefix}${val} ;;") attrset
-    );
-in
-{
-  inherit hostmap macCaseBuilder;
-}

sw/stateless-kiosk/programs.nix

@@ -1,7 +1,4 @@
 {
-  config,
-  lib,
-  pkgs,
   ...
 }:
 {

sw/stateless-kiosk/services.nix

@@ -1,11 +1,10 @@
 {
-  config,
-  lib,
   pkgs,
+  inputs,
   ...
 }:
 let
-  macCaseBuilder = (import ./mac-hostmap.nix { inherit lib; }).macCaseBuilder;
+  macCaseBuilder = inputs.self.lib.macCaseBuilder;
   shellCases = macCaseBuilder {
     varName = "NEW_HOST";
     prefix = "nix-station";

sw/tablet-kiosk/default.nix

@@ -5,7 +5,51 @@
   inputs,
   ...
 }:
-lib.mkMerge [
+
+with lib;
+
+let
+  cfg = config.athenix.sw.tablet-kiosk;
+in
+{
+  options.athenix.sw.tablet-kiosk = mkOption {
+    type = lib.types.submodule {
+      options = {
+        enable = mkOption {
+          type = lib.types.bool;
+          default = false;
+          description = ''
+            Enable tablet kiosk mode with touch-optimized interface.
+
+            Includes:
+            - Phosh mobile desktop environment
+            - Chromium in fullscreen kiosk mode
+            - On-screen keyboard (Squeekboard)
+            - Auto-login and auto-start browser
+            - Touch gesture support
+            - Optimized for Surface Pro tablets
+
+            Recommended for: Surface tablets, touchscreen kiosks, interactive displays
+          '';
+          example = true;
+        };
+
+        kioskUrl = mkOption {
+          type = lib.types.str;
+          default = "https://ha.factory.uga.edu";
+          description = ''
+            URL to display in the kiosk browser on startup.
+            The browser will automatically navigate to this URL in fullscreen mode.
+          '';
+          example = "https://dashboard.example.com";
+        };
+      };
+    };
+    default = { };
+    description = "Tablet kiosk configuration (Phosh, touch interface).";
+  };
+
+  config = mkIf cfg.enable (mkMerge [
     (import ./programs.nix {
       inherit
         config
@@ -30,4 +74,5 @@ lib.mkMerge [
         inputs
         ;
     })
-]
+  ]);
+}

sw/tablet-kiosk/services.nix

@@ -155,7 +155,7 @@
           --noerrdialogs \
           --disable-session-crashed-bubble \
           --disable-infobars \
-          ${config.athenix.sw.kioskUrl}
+          ${config.athenix.sw.tablet-kiosk.kioskUrl}
       '';
     };
   };

sw/theme.nix

@@ -1,7 +1,6 @@
 {
   pkgs,
   config,
-  osConfig,
   lib,
   ...
 }:

sw/update-ref.nix

@@ -1,5 +1,17 @@
-{ pkgs, ... }:
 {
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.athenix.sw;
+in
+{
+  config = mkIf cfg.enable {
     environment.systemPackages = with pkgs; [
       python3
       git
@@ -508,4 +520,5 @@
         printf "  rev = %s\n" "$CUR_REV" >&2
       '')
     ];
+  };
 }

sw/updater.nix

@@ -9,27 +9,47 @@ with lib;
 
 {
   options.athenix.sw.remoteBuild = lib.mkOption {
-    type = types.submodule {
+    type = lib.types.submodule {
       options = {
         hosts = mkOption {
-          type = types.listOf types.str;
+          type = lib.types.listOf lib.types.str;
           default = [ "engr-ugaif@192.168.11.133 x86_64-linux" ];
-          description = "List of remote build hosts for system rebuilding.";
+          description = ''
+            List of remote build hosts for system rebuilding.
+
+            Format: "user@hostname architecture"
+            Each host must have SSH access and nix-daemon available.
+
+            Useful for offloading builds from low-power devices (tablets, laptops)
+            to more powerful build servers.
+          '';
+          example = lib.literalExpression ''
+            [
+                        "builder@nix-builder x86_64-linux"
+                        "user@192.168.1.100 aarch64-linux"
+                      ]'';
         };
 
         enable = mkOption {
-          type = types.bool;
+          type = lib.types.bool;
           default = false;
-          description = "Whether to enable remote build for 'update-system' command.";
+          description = ''
+            Whether to enable remote builds for the 'update-system' command.
+
+            When enabled, 'update-system' will use the configured remote hosts
+            to build the new system configuration instead of building locally.
+
+            Automatically enabled for tablet-kiosk systems.
+          '';
         };
       };
     };
     default = { };
-    description = "Remote build configuration";
+    description = "Remote build configuration for system updates.";
   };
 
   config = {
-    athenix.sw.remoteBuild.enable = lib.mkDefault (config.athenix.sw.type == "tablet-kiosk");
+    athenix.sw.remoteBuild.enable = lib.mkDefault (config.athenix.sw.tablet-kiosk.enable);
 
     environment.systemPackages = [
       (pkgs.writeShellScriptBin "update-system" ''

templates/user/user.nix

@@ -1,4 +1,4 @@
-{ inputs, ... }:
+{ ... }:
 
 # ============================================================================
 # User Configuration
@@ -15,7 +15,6 @@
 # nixos-systems configuration (nixpkgs, home-manager, etc.).
 
 {
-  config,
   lib,
   pkgs,
   osConfig ? null, # Only available in home-manager context
@@ -60,7 +59,7 @@
       fd
       bat
     ]
-    ++ lib.optional (osConfig.athenix.sw.type or null == "desktop") firefox;
+    ++ lib.optional (osConfig.athenix.sw.desktop.enable or false) firefox;
   # Conditionally add packages based on system type
 
   # ========== Programs ==========

users.nix

@@ -13,8 +13,9 @@
   #
   # External User Configuration:
   # Users can specify external configuration modules via the 'external' attribute:
-  #   external = builtins.fetchGit { url = "..."; rev = "..."; };
+  #   external = { url = "..."; rev = "..."; submodules? = false; };
   #   external = /path/to/local/config;
+  #   external = builtins.fetchGit { ... }; # legacy, still supported
   #
   # External repositories should contain:
   #   - user.nix (required): Defines athenix.users.<name> options AND home-manager config
@@ -26,7 +27,7 @@
   #
   # User options can be set in users.nix OR in the external module's user.nix.
   # External module options take precedence over users.nix defaults.
-  athenix.users = {
+  config.athenix.users = {
     root = {
       isNormalUser = false;
       hashedPassword = "!";
@@ -47,9 +48,10 @@
       enable = true; # Default user, enabled everywhere
     };
     hdh20267 = {
-      external = builtins.fetchGit {
+      external = {
         url = "https://git.factory.uga.edu/hdh20267/hdh20267-nix";
         rev = "dbdf65c7bd59e646719f724a3acd2330e0c922ec";
+        # submodules = false; # optional, defaults to false
       };
     };
     sv22900 = {