core/lib/tests/modules/alias-with-priority-can-override.nix
2024-06-30 09:12:46 +01:00

65 lines
1.4 KiB
Nix

# This is a test to show that mkAliasOptionModule sets the priority correctly
# for aliased options.
#
# This test shows that an alias with a high priority is able to override
# a non-aliased option.
{ config, lib, ... }:
let
inherit (lib)
mkAliasOptionModule
mkForce
mkOption
types
;
in
{
options = {
# A simple boolean option that can be enabled or disabled.
enable = mkOption {
type = types.nullOr types.bool;
default = null;
example = true;
description = ''
Some descriptive text
'';
};
# mkAliasOptionModule sets warnings, so this has to be defined.
warnings = mkOption {
internal = true;
default = [ ];
type = types.listOf types.str;
example = [ "The `foo' service is deprecated and will go away soon!" ];
description = ''
This option allows modules to show warnings to users during
the evaluation of the system configuration.
'';
};
};
imports = [
# Create an alias for the "enable" option.
(mkAliasOptionModule [ "enableAlias" ] [ "enable" ])
# Disable the aliased option with a high priority so it
# should override the next import.
(
{ config, lib, ... }:
{
enableAlias = mkForce false;
}
)
# Enable the normal (non-aliased) option.
(
{ config, lib, ... }:
{
enable = true;
}
)
];
}