Modularized configuration now kind of works. (still need to do some refactoring)

config/default.nix

@@ -3,10 +3,12 @@
 {
   imports = [
     ./etc.nix
+    ./fonts.nix
     ./locale.nix
     ./networking.nix
     ./nix.nix
+    ./security.nix
     ./users.nix
     ./zsh.nix
-    ] ++ (if (config.machine.hostName != "Ophanim") then [./fonts.nix] else [./security.nix]);
+    ];
 }

config/etc.nix

@@ -1,7 +1,9 @@
 { config, lib, pkgs, ... }:
 
+with lib;
+
 {
-  environment.etc = {
+  environment.etc = mkIf (elem "etcfiles" config.machine.conffiles) {
     "i3/config".source = ./etc/i3/config;
     "i3/py3status".source = ./etc/i3/py3status;
     "mpv/input.conf".source = ./etc/mpv/input.conf;
@@ -9,7 +11,7 @@
     "youtube-dl.conf".source = ./etc/youtube-dl.conf;
   };
 
-  environment.variables = {
+  environment.variables = mkIf (elem "etcvars" config.machine.conffiles) {
     EDITOR="emacsclient -ca nano";
     NIXPKGS_ALLOW_UNFREE="1";
     WINEDLLOVERRIDES="winemenubuilder.exe=d";

config/fonts.nix

@@ -1,6 +1,8 @@
-{ pkgs, config, ... }:
+{ pkgs, lib, config, ... }:
 
-{
+with lib;
+
+mkIf (elem "fonts" config.machine.conffiles) {
   fonts = {
     enableFontDir = true;
     enableGhostscriptFonts = true;

config/networking.nix

@@ -1,7 +1,7 @@
 { config, lib, pkgs, ... }:
 
 let
- firewallcfg = config.machine.networking.firewall;
+ firewallcfg = config.machine.firewall;
 in {
   networking = {
     hostName = config.machine.hostName;

config/nix.nix

@@ -9,9 +9,9 @@
     extraOptions = ''
       build-timeout = 86400  # 24 hours
     '';
-    sshServe.enable = true;
-    sshServe.keys = ( if config.networking.hostName == "Ophanim" then [ (builtins.replaceStrings ["\n"] [""] (builtins.readFile /secret/nix-ssh.pub)) ] else []);
-    binaryCachePublicKeys = [ (builtins.replaceStrings ["\n"] [""] (builtins.readFile /secret/hydra_cache.pub)) ];
+    sshServe.enable = if config.services.hydra.enable then true else false;
+    sshServe.keys = if config.services.hydra.enable then [ (builtins.readFile /secret/nix-ssh.pub) ] else [];
+    binaryCachePublicKeys = if config.services.hydra.enable then [ (builtins.readFile /secret/hydra_cache.pub) ] else [];
     trustedBinaryCaches = [
       "https://cache.nixos.org"
       "https://cache.ophanim.de"

config/security.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-{
+with lib;
+
+mkIf (elem "security" config.machine.conffiles) {
   security = {
     audit.enable = true;
     auditd.enable = true;

config/zsh.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-{
+with lib;
+
+mkIf (elem "zsh" config.machine.conffiles) {
   programs.zsh = {
     enable = true;
     autosuggestions.enable = true;

configuration.nix

@@ -8,17 +8,9 @@ let
 in rec {
   imports = [
     cfgPath
-
-
-    # use
-#    config.machine.confPath
-    # instead of
-    ./machines/Lilim/Lilim.nix
-
-
-#    ./config/default.nix # same problem as above
+    ./config/default.nix # same problem as above
     ./pkgs/nixpkgs.nix
     ./pkgs/pkgsets.nix
-#    ./services/default.nix # same problem as above
+    ./services/default.nix # same problem as above
   ];
 }

machines/Lilim/configuration.nix

@@ -3,10 +3,20 @@
 with lib;
 
 {
-  imports = [ ../../options/machine.nix ];
+  imports = [ 
+    ../../options/machine.nix 
+    ./Lilim.nix
+  ];
 
   config.machine = {
-    confPath = ./Lilim.nix;
+    allowUnfree = true;
+    hostName = "Lilim";
+    conffiles = [
+      "etcfiles"
+      "etcvars"
+      "fonts"
+      "zsh"
+    ];
     pkgs = [
       "base"
       "dict"
@@ -20,13 +30,11 @@ with lib;
       "xpkgs"
     ];
     services = [
-      ../../services/xserver.nix
-      ../../services/docker.nix
-      ../../services/udev.nix
-      ../../services/cups.nix
+      "xserver"
+      "docker"
+      "udev"
+      "cups"
     ];
-    allowUnfree = true;
-    hostName = "Lilim";
     firewall = {
       allowPing = true;
       allowedUDPPorts = [];

machines/Ophanim/configuration.nix

@@ -1,23 +1,36 @@
+{ config, lib }:
+
+with lib;
+
 {
-  confPath = ./Ophanim.nix;
+  imports = [ 
+    ../../options/machine.nix 
+    ./Ophanim.nix
+  ];
+
+  config.machine = {
+    hostName = "Ophanim";
+    allowUnfree = true;
+    conffiles = [
+      "etcfiles"
+      "etcvars"
+      "fonts"
+      "zsh"
+    ];
     pkgs = [
       "base"
       "emacs"
       "server"
     ];
     services = [
-    ../../services/gitea.nix
-    ../../services/hydra.nix
-    ../../services/mailserver.nix
-    ../../services/mariaDB.nix
-    ../../services/nextcloud.nix
-    ../../services/nginx.nix
-    ../../services/openssh.nix
+      "gitea"
+      "hydra"
+      "mailserver"
+      "mariaDB"
+      "nextcloud"
+      "nginx"
+      "openssh"
     ];
-  conf = {
-    allowUnfree = true;
-    networking = {
-      hostName = "Ophanim";
     firewall = {
       allowPing = false;
       allowedUDPPorts = [ 22 80 443 ];
@@ -26,5 +39,4 @@
       allowedTCPPortRanges = [];
     };
   };
-  };
 }

options/machine.nix

@@ -23,11 +23,17 @@ with lib;
       '';
     };
     services = mkOption {
-      type = types.listOf types.path;
+      type = types.listOf types.string;
       description = ''
         List of services to be enabled.
       '';
     };
+    conffiles = mkOption {
+      type = types.listOf types.string;
+      description = ''
+        List of configuration files to be enabled.
+      '';
+    };
     hostName = mkOption {
       type = types.str;
       description = ''

pkgs/pkgsets.nix

@@ -43,6 +43,7 @@ let
     ntfs3g
     oh-my-zsh
     openssl
+    parted
     p7zip
     pciutils
     psmisc
@@ -104,7 +105,7 @@ let
     pkgs.ledger
     yaml-mode
     company
-    /* C/C++ */ clang-format irony company-irony  company-irony-c-headers flycheck-irony
+    /* C/C++ */ irony company-irony  company-irony-c-headers flycheck-irony
     /* Haskell */ haskell-mode flycheck-haskell
     /* Org */ org org-ref pdf-tools org-bullets org-caldav
     /* Rust */ rust-mode flycheck-rust racer

services/cups.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-{
+with lib;
+
+mkIf (elem "cups" config.machine.services) {
   services.printing = {
     enable = true;
     startWhenNeeded = true;

services/default.nix

@@ -1,7 +1,19 @@
 { config, lib, pkgs, ... }:
 
-with lib;
-
 {
-  imports = config.machine.services;
+  imports = [
+    ./cups.nix
+    ./docker.nix
+    ./fail2ban.nix
+    ./gitea.nix
+    ./hydra.nix
+    ./mailserver/default.nix
+    ./mailserver.nix
+    ./mariaDB.nix
+    ./nextcloud.nix
+    ./nginx.nix
+    ./openssh.nix
+    ./udev.nix
+    ./xserver.nix
+  ];
 }

services/docker.nix

@@ -1,7 +1,9 @@
 { config, lib, pkgs, ... }:
 
 # Note: add privileged users to docker group for access
-{
+with lib;
+
+mkIf (elem "docker" config.machine.services) {
   virtualisation.docker.enable = true;
   environment.systemPackages = with pkgs; [ docker-compose docker-machine ];
   ### Docker Image stuff will probably follow here

services/fail2ban.nix

@@ -1,7 +1,9 @@
 { config, lib, pkgs, ... }:
 
 # mostly taken from https://github.com/davidak/nixos-config/blob/master/services/fail2ban.nix
-{
+with lib;
+
+mkIf (elem "fail2ban" config.machine.services) {
   services.fail2ban = {
     enable = true;
     jails = { 
@@ -50,7 +52,7 @@
         action = iptables-multiport[name=ReqLimit, port="http,https", protocol=tcp]
         findtime = 600
         bantime = 7200
-      ''
+      '';
     };
   }; 
 

services/gitea.nix

@@ -1,6 +1,8 @@
-{ stdenv, conf, pkgs, ... }:
+{ config, lib, pkgs, ... }:
 
-{
+with lib;
+
+mkIf (elem "gitea" config.machine.services) {
   services.gitea = {
     enable = true;
     user = "git";

services/hydra.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, ... }:
+{ config, lib, pkgs, ... }:
 
 # hydra user needs to be manually crated
 # sudo -u hydra -s
@@ -8,7 +8,9 @@
 # https://github.com/NixOS/nixos-org-configurations/blob/master/delft/hydra.nix
 # https://gist.github.com/LnL7/fcd5c0bf772f2165a1ac40be6617d2f4
 
-{
+with lib;
+
+mkIf (elem "hydra" config.machine.services) {
   # also take a look at ../conf/nix.nix
   nix.buildMachines = [
     {

services/mailserver.nix

@@ -1,17 +1,15 @@
-{ lib, config, pkgs, ... }:
+{ config, lib, pkgs, ... }:
 
-{
-  imports = [
-    ./mailserver/default.nix
-  ];
+with lib;
 
+mkIf (elem "mailserver" config.machine.services) {
   mailserver = rec {
     enable = true;
     fqdn = "mail.ophanim.de";
     domains = [ "ophanim.de" ];
     loginAccounts = {
         "derped@ophanim.de" = {
-            hashedPassword = (builtins.replaceStrings ["\n"] [""] (builtins.readFile /secret/derped.mail));
+            hashedPassword = (builtins.readFile /secret/derped.mail);
         };
     };
     # Use Let's Encrypt certificates. Note that this needs to set up a stripped
@@ -24,9 +22,9 @@
 
     # Enable IMAP and POP3
     enableImap = true;
-    enablePop3 = true;
+    enablePop3 = false;
     enableImapSsl = true;
-    enablePop3Ssl = true;
+    enablePop3Ssl = false;
 
     # Enable the ManageSieve protocol
     enableManageSieve = true;

services/mariaDB.nix

@@ -1,12 +1,14 @@
-{ config, pkgs, ... }:
+{ config, lib, pkgs, ... }:
+
+with lib;
 
 let
-  giteapwd = (builtins.replaceStrings ["\n"] [""] (builtins.readFile /secret/gitea));
-in {
+  giteapwd = if config.services.gitea.enable then (builtins.readFile /secret/gitea) else "";
+in mkIf (elem "mariaDB" config.machine.services) {
   services.mysql = {
     enable = true;
     package = pkgs.mariadb;
-    initialDatabases = [ {
+    initialDatabases = [ mkIf config.services.gitea.enable {
       name = "gitea";
       schema = pkgs.writeText "gitea.sql"
       ''
@@ -16,3 +18,4 @@ in {
     } ];
   };
 }
+

services/nextcloud.nix

@@ -1,6 +1,8 @@
-{ conf, pkgs, ... }:
+{ config, lib, pkgs, ... }:
 
-{
+with lib;
+
+mkIf (elem "nextcloud" config.machine.services) {
   services.nextcloud = {
     enable = true;
     home = "/var/lib/nextcloud";

services/nginx.nix

@@ -8,9 +8,9 @@
 
 { config, lib, pkgs, ... }:
 
-let
-  gitpkgs = import /nixpkgs/default.nix {};
-in {
+with lib;
+
+mkIf (elem "nginx" config.machine.services) {
   services.nginx = {
     enable = true;
     recommendedGzipSettings = true;

services/openssh.nix

@@ -3,7 +3,10 @@
 # For reference:
 # https://infosec.mozilla.org/guidelines/openssh.html
 # https://stribika.github.io/2015/01/04/secure-secure-shell.html
-{
+
+with lib;
+
+mkIf (elem "openssh" config.machine.services) {
   services.openssh = {
     enable = true;
     sftpFlags = [ "-f AUTHPRIV" "-l INFO" ];

services/udev.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 
-{
+with lib;
+
+mkIf (elem "udev" config.machine.services) {
   services.udev.extraRules = ''
  Valve USB devices
 SUBSYSTEM=="usb", ATTRS{idVendor}=="28de", TAG+="uaccess", TAG+="udev-acl"