nixos/networkd: mark `units` option as internal

The options at `systemd.network` (`links`, `netdevs` and `networks`) are
directly mapped to the three different unit types of `systemd-networkd(8)`.

However there's also the option `systemd.network.units` which is
basically used as a container for generated unit-configs that are linked
to `/etc/systemd/networkd`[1].

This should not be exposed to the user as it's unclear whether or not it
should be used directly which can be pretty confusing which is why I decided to
declare this option as internal (including all sub-options as `internal`
doesn't seem to be propagated to submodules).

[1] https://github.com/NixOS/nixpkgs/blob/9db75ed88fd87e17ec448ad7a43b62acb4842854/nixos/modules/system/boot/networkd.nix#L933-L937

1 files changed, 2 insertions, 1 deletions

diff --git a/nixos/modules/system/boot/networkd.nix b/nixos/modules/system/boot/networkd.nix
index 226769f1059..71668fdfccc 100644
--- a/nixos/modules/system/boot/networkd.nix
+++ b/nixos/modules/system/boot/networkd.nix
@@ -911,9 +911,10 @@ in
     systemd.network.units = mkOption {
       description = "Definition of networkd units.";
       default = {};
+      internal = true;
       type = with types; attrsOf (submodule (
         { name, config, ... }:
-        { options = concreteUnitOptions;
+        { options = mapAttrs (_: x: x // { internal = true; }) concreteUnitOptions;
           config = {
             unit = mkDefault (makeUnit name config);
           };