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home-manager/modules/misc/submodule-support.nix
name_snrl c2cd2a52e0
submodule-support: add default values for top-level configs
This way the end user can easily check whether the home-manager
configuration is part of the module or not. Example of use:

```nix
{ lib, nixosConfig, ... }:
let
  mkIfNixos = lib.mkIf nixosConfig != null;
in
{
  programs.foot.enable = mkIfNixos true;
}
```
2024-08-23 19:56:03 +02:00

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{ lib, ... }:
with lib;
{
meta.maintainers = [ maintainers.rycee ];
options.submoduleSupport = {
enable = mkOption {
type = types.bool;
default = false;
internal = true;
description = ''
Whether the Home Manager module system is used as a submodule
in, for example, NixOS or nix-darwin.
'';
};
externalPackageInstall = mkOption {
type = types.bool;
default = false;
internal = true;
description = ''
Whether the packages of {option}`home.packages` are
installed separately from the Home Manager activation script.
In NixOS, for example, this may be accomplished by installing
the packages through
{option}`users.users.name?.packages`.
'';
};
};
config = {
# To make it easier for the end user to override the values in the
# configuration depending on the installation method, we set default values
# for the arguments that are defined in the NixOS/nix-darwin modules.
#
# Without these defaults, these attributes would simply not exist, and the
# module system can not inform modules about their non-existence; see
# https://github.com/NixOS/nixpkgs/issues/311709#issuecomment-2110861842
_module.args = {
osConfig = mkDefault null;
nixosConfig = mkDefault null;
darwinConfig = mkDefault null;
};
};
}