os/lib/mkFlake/evalArgs.nix

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{ lib }:
{ args }:
let
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argOpts = with lib; { config, ... }:
let
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inherit (lib) os;
cfg = config;
inherit (config) self;
maybeImport = obj:
if (builtins.typeOf obj == "path") || (builtins.typeOf obj == "string") then
import obj
else
obj;
/* Custom types needed for arguments */
moduleType = with types; pathTo (anything // {
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inherit (submodule { }) check;
description = "valid module";
});
# to export modules we need paths to get the name
exportModuleType = with types;
(addCheck path (x: moduleType.check (import x))) // {
description = "path to a module";
};
overlayType = pathTo (types.anything // {
check = builtins.isFunction;
description = "valid Nixpkgs overlay";
});
systemType = types.enum config.supportedSystems;
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flakeType = with types; (addCheck attrs lib.isStorePath) // {
description = "nix flake";
};
# Apply maybeImport during merge and before check
# To simplify apply keys and improve type checking
pathTo = elemType: with types; coercedTo path maybeImport elemType;
pathToListOf = elemType: with types; pathTo (listOf elemType);
coercedListOf = elemType: with types;
coercedTo anything (x: flatten (singleton x)) (listOf elemType);
/* Submodules needed for API containers */
channelsModule = { name, ... }: {
options = with types; {
input = mkOption {
type = flakeType;
default = cfg.inputs.${name};
defaultText = "inputs.<name>";
description = ''
nixpkgs flake input to use for this channel
'';
};
overlays = mkOption {
type = coercedListOf overlayType;
default = [ ];
description = escape [ "<" ">" ] ''
overlays to apply to this channel
these will get exported under the 'overlays' flake output
as <channel>/<name> and any overlay pulled from ''\${inputs}
will be filtered out
'';
};
config = mkOption {
type = pathTo attrs;
default = { };
apply = lib.recursiveUpdate cfg.channelsConfig;
description = ''
nixpkgs config for this channel
'';
};
};
};
hostModule = {
options = with types; {
# anything null in hosts gets filtered out by mkFlake
system = mkOption {
type = (nullOr systemType) // {
description = "system defined in `supportedSystems`";
};
default = null;
description = ''
system for this host
'';
};
channelName = mkOption {
type = (nullOr (types.enum (builtins.attrNames config.channels))) // {
description = "a channel defined in `channels`";
};
default = null;
description = ''
Channel this host should follow
'';
};
};
};
# This is only needed for hostDefaults
# modules in each host don't get exported
externalModulesModule = {
options = {
externalModules = mkOption {
type = with types; listOf moduleType;
default = [ ];
description = ''
modules to include that won't be exported
meant importing modules from external flakes
'';
};
};
};
modulesModule = {
options = {
modules = mkOption {
type = with types; coercedListOf moduleType;
default = [ ];
description = ''
modules to include
'';
};
};
};
exportModulesModule = name: {
options = {
modules = mkOption {
type = with types; pathTo (coercedListOf exportModuleType);
default = [ ];
description = ''
modules to include in all hosts and export to ${name}Modules output
'';
};
};
};
# Home-manager's configs get exported automatically from nixos.hosts
# So there is no need for a host options in the home namespace
# This is only needed for nixos
includeHostsModule = name: {
options = with types; {
hostDefaults = mkOption {
type = submodule [
hostModule
externalModulesModule
(exportModulesModule name)
];
default = { };
description = ''
Defaults for all hosts.
the modules passed under hostDefaults will be exported
to the '${name}Modules' flake output.
They will also be added to all hosts.
'';
};
hosts = mkOption {
type = attrsOf (submodule [ hostModule modulesModule ]);
default = { };
description = ''
configurations to include in the ${name}Configurations output
'';
};
};
};
# profiles and suites - which are profile collections
profilesModule = { config, ... }: {
options = with types; {
profiles = mkOption {
type = listOf path;
default = [ ];
description = ''
profile folders that can be collected into suites
the name of the argument passed to suites is based
on the folder name.
[ ./profiles ] => { profiles }:
'';
};
suites = mkOption {
type = pathTo (functionTo attrs);
default = _: { };
apply = suites: os.mkSuites {
inherit suites;
inherit (config) profiles;
};
description = ''
Function that takes profiles and returns suites for this config system
These can be accessed through the 'suites' special argument.
'';
};
};
};
in
{
# this does not get propagated to submodules
# to allow passing flake outputs directly to mkFlake
config._module.check = false;
options = with types; {
self = mkOption {
type = flakeType;
description = "The flake to create the devos outputs for";
};
inputs = mkOption {
type = attrsOf flakeType;
description = ''
inputs for this flake
used to set channel defaults and create registry
'';
};
supportedSystems = mkOption {
type = listOf str;
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default = lib.defaultSystems;
description = ''
The systems supported by this flake
'';
};
channelsConfig = mkOption {
type = pathTo attrs;
default = { };
description = ''
nixpkgs config for all channels
'';
};
channels = mkOption {
type = attrsOf (submodule channelsModule);
default = { };
description = ''
nixpkgs channels to create
'';
};
nixos = mkOption {
type = submodule [ (includeHostsModule "nixos") profilesModule ];
default = { };
description = ''
hosts, modules, suites, and profiles for nixos
'';
};
home = mkOption {
type = submodule [
profilesModule
(exportModulesModule "home")
externalModulesModule
];
default = { };
description = ''
hosts, modules, suites, and profiles for home-manager
'';
};
};
};
in
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lib.evalModules {
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modules = [ argOpts args ];
}