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|
{ config, lib, pkgs, extendModules, noUserModules, ... }:
let
inherit (lib)
concatStringsSep
mapAttrs
mapAttrsToList
mkOption
types
;
# This attribute is responsible for creating boot entries for
# child configuration. They are only (directly) accessible
# when the parent configuration is boot default. For example,
# you can provide an easy way to boot the same configuration
# as you use, but with another kernel
# !!! fix this
children =
mapAttrs
(childName: childConfig: childConfig.configuration.system.build.toplevel)
config.specialisation;
in
{
options = {
specialisation = mkOption {
default = { };
example = lib.literalExpression "{ fewJobsManyCores.configuration = { nix.settings = { core = 0; max-jobs = 1; }; }; }";
description = ''
Additional configurations to build. If
`inheritParentConfig` is true, the system
will be based on the overall system configuration.
To switch to a specialised configuration
(e.g. `fewJobsManyCores`) at runtime, run:
```
sudo /run/current-system/specialisation/fewJobsManyCores/bin/switch-to-configuration test
```
'';
type = types.attrsOf (types.submodule (
local@{ ... }:
let
extend =
if local.config.inheritParentConfig
then extendModules
else noUserModules.extendModules;
in
{
options.inheritParentConfig = mkOption {
type = types.bool;
default = true;
description = "Include the entire system's configuration. Set to false to make a completely differently configured system.";
};
options.configuration = mkOption {
default = { };
description = ''
Arbitrary NixOS configuration.
Anything you can add to a normal NixOS configuration, you can add
here, including imports and config values, although nested
specialisations will be ignored.
'';
visible = "shallow";
inherit (extend { modules = [ ./no-clone.nix ]; }) type;
};
}
));
};
};
config = {
system.systemBuilderCommands = ''
mkdir $out/specialisation
${concatStringsSep "\n"
(mapAttrsToList (name: path: "ln -s ${path} $out/specialisation/${name}") children)}
'';
};
# uses extendModules to generate a type
meta.buildDocsInSandbox = false;
}
|