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vic merged 1 commit into from
Apr 1, 2026
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feat(template): forward classes for 3rd-party flake-parts modules #351

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2 changes: 1 addition & 1 deletion .github/workflows/test.yml
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Expand Up @@ -84,7 +84,7 @@ jobs:
# max-parallel: 2
strategy:
matrix:
template: [bogus, minimal, microvm, nvf-standalone]
template: [bogus, minimal, microvm, nvf-standalone, flake-parts-modules]
os: [ubuntu-latest]
name: Check template ${{matrix.template}} ${{matrix.os}}
runs-on: ${{matrix.os}}
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2 changes: 2 additions & 0 deletions nix/default.nix
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Expand Up @@ -19,6 +19,8 @@ let
microvm.description = "MicroVM example";
nvf-standalone.path = ../templates/nvf-standalone;
nvf-standalone.description = "Standalone NVF";
flake-parts-modules.path = ../templates/flake-parts-modules;
flake-parts-modules.description = "flake-parts classes";
ci.path = ../templates/ci;
ci.description = "Feature Tests";
bogus.path = ../templates/bogus;
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2 changes: 1 addition & 1 deletion nix/lib/forward.nix
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Expand Up @@ -33,7 +33,7 @@ let
};

freeformMod = {
config._module.freeformType = lib.types.lazyAttrsOf lib.types.anything;
config._module.freeformType = lib.types.lazyAttrsOf lib.types.unspecified;
};

adapterMods = [
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7 changes: 7 additions & 0 deletions templates/flake-parts-modules/README.md
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@@ -0,0 +1,7 @@
# Example Den custom classes for flake-parts modules and perSystem outputs.

This example showcases Den forward classes for third-party flake-parts modules.

This README is generated by `nix run .#write-files`.

See den.nix, custom-classes.nix and perSystem-forward.nix
206 changes: 206 additions & 0 deletions templates/flake-parts-modules/flake.lock
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38 changes: 38 additions & 0 deletions templates/flake-parts-modules/flake.nix
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{
description = "Using flake-parts modules from Den";

outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } (inputs.import-tree ./modules);

inputs = {
den.url = "github:vic/den";
import-tree.url = "github:vic/import-tree";
nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
flake-parts.url = "github:hercules-ci/flake-parts";
flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";

pkgs-by-name-for-flake-parts.url = "github:drupol/pkgs-by-name-for-flake-parts";

files.url = "github:mightyiam/files";

devshell.url = "github:numtide/devshell";
devshell.inputs.nixpkgs.follows = "nixpkgs";

treefmt-nix.url = "github:numtide/treefmt-nix";
treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";

nix-unit.url = "github:nix-community/nix-unit";
nix-unit.inputs = {
nixpkgs.follows = "nixpkgs";
flake-parts.follows = "flake-parts";
nix-github-actions.follows = "";
treefmt-nix.follows = "treefmt-nix";
};

nix-topology.url = "github:oddlama/nix-topology";
nix-topology.inputs = {
nixpkgs.follows = "nixpkgs";
flake-parts.follows = "flake-parts";
};

};
}
94 changes: 94 additions & 0 deletions templates/flake-parts-modules/modules/custom-classes.nix
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@@ -0,0 +1,94 @@
{
den,
lib,
inputs,
config,
...
}:
{
systems = builtins.attrNames den.hosts;

# Some third-party flake-parts modules for demo purposes.
# Read their documentation at https://flake.parts for usage.
imports = [
inputs.devshell.flakeModule
inputs.files.flakeModules.default
inputs.nix-topology.flakeModule
inputs.nix-unit.modules.flake.default
inputs.pkgs-by-name-for-flake-parts.flakeModule
inputs.treefmt-nix.flakeModule
];

# some globals
perSystem = {
pkgsDirectory = ../packages;
nix-unit = {
allowNetwork = true;
inputs = inputs;
};
};

# den.ctx.flake-parts transformations define which
# custom classes exist and where to read them.
den.ctx.flake-parts.into = _: {

# Read flake-parts classes from hosts and their includes
host = map (host: { inherit host; }) (
builtins.concatMap builtins.attrValues (builtins.attrValues den.hosts)
);

# Our custom flake-parts perSystem classes.
# These are partial params for `den._.forward`.
# See ./perSystem-forward.nix
flake-parts-system = [

# A class for flake-parts' perSystem.packages
# NOTE: this is different from Den's flake-packages class.
{
fromClass = _: "packages";
intoPath = _: [ "packages" ];
}

{
fromClass = _: "files";
intoPath = _: [
"files"
];
adapterModule = { };
}

# a default `devshell` class
{
fromClass = _: "devshell";
intoPath = _: [
"devshells"
"default"
];
}

{
fromClass = _: "treefmt";
intoPath = _: [ "treefmt" ];
}

{
fromClass = _: "tests";
intoPath = _: [
"nix-unit"
"tests"
];
# test helpers
adaptArgs =
{ pkgs, ... }:
let
igloo = config.flake.nixosConfigurations.igloo.config;
tux = igloo.users.users.tux;
in
{
inherit pkgs igloo tux;
};
}
];
};

}
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