global/general: replace ensure with systemd tmpfiles

modules/functionality/ensure.nix

@@ -1,21 +0,0 @@
-{ config, lib, pkgs, ... }:
-with lib;
-with lib.our;
-let
-  cfg = config.services.ensure;
-in
-{
-  options.services.ensure = with types; {
-    enable = mkBoolOpt true;
-    directories = mkOpt (listOf str) [ ];
-  };
-
-  config.systemd.services = {
-    "ensure-directories" = mkIf (cfg.enable && (length cfg.directories > 0)) {
-      description = "Ensures certain directories exist (${concatStringsSep "," cfg.directories})";
-      wantedBy = [ "multi-user.target" ];
-      serviceConfig.Type = "oneshot";
-      script = "mkdir -p ${concatStringsSep " " cfg.directories}";
-    };
-  };
-}

modules/global/general.nix

@@ -13,13 +13,15 @@
     # Enable Early Out of Memory service
     earlyoom.enable = true;
 
-    # Ensure certain necessary directories always exist
-    ensure.directories = [ "/mnt" ];
-
     # Accept EULA for all minecraft servers
     minecraft-servers.eula = true;
   };
 
+  # Ensure certain necessary directories always exist
+  systemd.tmpfiles.rules = [
+    "d /mnt 0777 root root - -"
+  ];
+
   system.activationScripts = {
     # FIX: command-not-found database doesn't exist normally
     # FIXME: activation script doesn't work properly, and frequently errors

readme.md

@@ -43,7 +43,6 @@ The real meat of the configuration, defines a bunch of NixOS modules that all ge
 
 Modules that create some sort of new functionality.
 
-- `ensure.nix`: Takes a list of directories, and ensures they exist after boot.
 - `soft-serve.nix`: Runs the `soft-serve` git server.
 - `ssh-tunnel.nix`: Runs an SSH session for opening ports.