profiles/filesystem: add setups namespace

There will be added options that are not exactly filesystem setups.

modules/nixos/profiles/filesystem.nix

@@ -2,6 +2,10 @@
 # nice for setting up shop for certain tasks with the flick of the switch to ON
 # (e.g., `config.profiles.filesystem.archive.enable = true`) and not have
 # conflicting settings all throughout the configuration.
+#
+# Much of the filesystem setups are taking advantage of systemd's fstab
+# extended options which you can refer to at systemd.mount(5), mount(5), and
+# the filesystems' respective manual pages.
 { config, options, lib, pkgs, ... }:
 
 let
@@ -9,25 +13,14 @@ let
 in
 {
   options.profiles.filesystem = {
-    archive.enable = lib.mkOption {
-      type = lib.types.bool;
-      description = ''
-        Add the archive storage to the list of filesystems.
-      '';
-      default = false;
-    };
-
-    external-hdd.enable = lib.mkOption {
-      type = lib.types.bool;
-      description = ''
-        Add the external hard drive to the list of filesystems.
-      '';
-      default = false;
+    setups = {
+      archive.enable = lib.mkEnableOption "automounting offline archive";
+      external-hdd.enable = lib.mkEnableOption "automounting personal external hard drive";
     };
   };
 
   config = lib.mkMerge [
-    (lib.mkIf cfg.archive.enable {
+    (lib.mkIf cfg.setups.archive.enable {
       fileSystems."/mnt/archives" = {
         device = "/dev/disk/by-uuid/6ba86a30-5fa4-41d9-8354-fa8af0f57f49";
         fsType = "btrfs";
@@ -40,13 +33,10 @@ in
           "compress=zstd:9"
           "space_cache=v2"
 
-          # General mount options from mount.5 manual page.
           "noauto"
           "nofail"
           "user"
 
-          # See systemd.mount.5 and systemd.automount.5 manual page for more
-          # details.
           "x-systemd.automount"
           "x-systemd.idle-timeout=2"
           "x-systemd.device-timeout=2"
@@ -54,7 +44,7 @@ in
       };
     })
 
-    (lib.mkIf cfg.external-hdd.enable {
+    (lib.mkIf cfg.setups.external-hdd.enable {
       fileSystems."/mnt/external-storage" = {
         device = "/dev/disk/by-uuid/665A391C5A38EB07";
         fsType = "ntfs";
@@ -64,8 +54,6 @@ in
           "noauto"
           "user"
 
-          # See systemd.mount.5 and systemd.automount.5 manual page for more
-          # details.
           "x-systemd.automount"
           "x-systemd.device-timeout=2"
           "x-systemd.idle-timeout=2"

modules/nixos/tasks/backup-archive/default.nix

@@ -59,7 +59,7 @@ in
         "ssh-key" = { };
       });
 
-    profiles.filesystem = {
+    profiles.filesystem.setups = {
       archive.enable = true;
       external-hdd.enable = true;
     };

modules/nixos/tasks/multimedia-archive/default.nix

@@ -100,7 +100,7 @@ in
           "secrets-config" = { };
         });
 
-      profiles.filesystem.archive.enable = true;
+      profiles.filesystem.setups.archive.enable = true;
 
       services.yt-dlp = {
         enable = true;