refactor flake

* switched from flake-utils to flake-parts
* dropped the overlay and instead populate configurable options for all
required authentik components in the module
* `nixosModule.default` is now a top-level output following the flake spec,
instead of the previously incorrect system-specific definition

TODO.md

@@ -2,6 +2,5 @@
 
 * fill empty parts of README
 * provide separate packages / modules for outposts
-* fix `flake check`
 * configure github checks
 * add some more subtests to VM test

flake.lock

@@ -17,6 +17,24 @@
         "type": "github"
       }
     },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1687762428,
+        "narHash": "sha256-DIf7mi45PKo+s8dOYF+UlXHzE0Wl/+k3tXUyAoAnoGE=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "37dd7bb15791c86d55c5121740a1887ab55ee836",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1676283394,
@@ -71,6 +89,24 @@
         "type": "github"
       }
     },
+    "nixpkgs-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1685564631,
+        "narHash": "sha256-8ywr3AkblY4++3lIVxmrWZFzac7+f32ZEhH/A8pNscI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4f53efe34b3a8877ac923b9350c874e3dcd5dc0a",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "poetry2nix": {
       "inputs": {
         "flake-utils": [
@@ -97,6 +133,7 @@
     "root": {
       "inputs": {
         "authentik-src": "authentik-src",
+        "flake-parts": "flake-parts",
         "flake-utils": "flake-utils",
         "napalm": "napalm",
         "nixpkgs": "nixpkgs",

flake.nix

@@ -3,6 +3,7 @@
 
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
+    flake-parts.url = "github:hercules-ci/flake-parts";
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
     poetry2nix = {
       url = "github:nix-community/poetry2nix";
@@ -24,35 +25,41 @@
     };
   };
 
-  outputs = {
-      self,
-      nixpkgs,
-      flake-utils,
-      poetry2nix,
-      napalm,
-      authentik-src
-    }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        authentik-version = "2023.5.4"; # to pass to the drvs of some components
-        inherit (poetry2nix.legacyPackages.${system})
+  outputs = inputs@{
+    self,
+    nixpkgs,
+    flake-parts,
+    poetry2nix,
+    napalm,
+    authentik-src,
+    ...
+  }:
+
+  flake-parts.lib.mkFlake
+    { inherit inputs; }
+    ({ inputs, lib, withSystem, ... }:
+    let
+      authentik-version = "2023.5.4"; # to pass to the drvs of some components
+    in rec {
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux" # not tested
+      ];
+      flake = {
+        nixosModules.default = { pkgs, ... }: {
+          imports = [ ./module.nix ];
+          services.authentik.authentikComponents = withSystem pkgs.stdenv.hostPlatform.system (
+            { config, ... }:
+            { inherit (config.packages) celery staticWorkdirDeps migrate pythonEnv frontend gopkgs docs; }
+          );
+        };
+      };
+      perSystem = { inputs', pkgs, system, ... }: let
+        inherit (inputs'.poetry2nix.legacyPackages)
           mkPoetryEnv
           defaultPoetryOverrides;
-        pkgs = nixpkgs.legacyPackages.${system};
-      in
-      rec {
-        nixosModules = {
-          default = import ./module.nix;
-        };
-        overlays = {
-          default = final: prev: {
-            authentik = {
-              inherit (packages) celery staticWorkdirDeps migrate pythonEnv frontend gopkgs docs;
-            };
-          };
-        };
+      in {
         packages = rec {
-          inherit authentik-src;
           docs = napalm.legacyPackages.${system}.buildPackage "${authentik-src}/website" {
             version = authentik-version; # 0.0.0 specified upstream
             NODE_ENV = "production";
@@ -163,11 +170,10 @@
               --prefix PYTHONPATH : ${staticWorkdirDeps}
           '';
         };
-
         checks.default = (import ./test.nix {
-          inherit pkgs overlays nixosModules;
+          inherit pkgs;
+          inherit (self) nixosModules;
         });
-
         devShells.default = pkgs.mkShell {
           packages = [
             # to generate a v2 lockfile from the v3 lockfile provided by upstream:
@@ -175,5 +181,6 @@
             pkgs.nodejs
           ];
         };
-      });
+      };
+    });
 }

module.nix

@@ -17,7 +17,7 @@ let
     mkEnableOption
     mkOption;
 
-  inherit (pkgs.authentik)
+  inherit (cfg.authentikComponents)
     migrate
     gopkgs
     celery
@@ -29,6 +29,16 @@ in
   options.services.authentik = {
     enable = mkEnableOption "authentik";
 
+    authentikComponents = {
+      celery = mkOption { type = types.package; };
+      staticWorkdirDeps = mkOption { type = types.package; };
+      migrate = mkOption { type = types.package; };
+      pythonEnv = mkOption { type = types.package; };
+      frontend = mkOption { type = types.package; };
+      gopkgs = mkOption { type = types.package; };
+      docs = mkOption { type = types.package; };
+    };
+
     settings = mkOption {
       type = types.submodule {
         freeformType = settingsFormat.type;
@@ -45,8 +55,8 @@ in
   config = mkIf cfg.enable {
     services = {
       authentik.settings = {
-        blueprints_dir = mkDefault "${pkgs.authentik.staticWorkdirDeps}/blueprints";
-        template_dir = mkDefault "${pkgs.authentik.staticWorkdirDeps}/templates";
+        blueprints_dir = mkDefault "${cfg.authentikComponents.staticWorkdirDeps}/blueprints";
+        template_dir = mkDefault "${cfg.authentikComponents.staticWorkdirDeps}/templates";
         postgresql = {
           user = mkDefault "authentik";
           name = mkDefault "authentik";
@@ -84,7 +94,7 @@ in
           RemainAfterExit = true;
           DynamicUser = true;
           User = "authentik";
-          ExecStart = "${pkgs.authentik.migrate}/bin/migrate.py";
+          ExecStart = "${cfg.authentikComponents.migrate}/bin/migrate.py";
         };
       };
       authentik-worker = {
@@ -97,7 +107,7 @@ in
           DynamicUser = true;
           User = "authentik";
           # TODO maybe make this configurable
-          ExecStart = "${pkgs.authentik.celery}/bin/celery -A authentik.root.celery worker -Ofair --max-tasks-per-child=1 --autoscale 3,1 -E -B -s /tmp/celerybeat-schedule -Q authentik,authentik_scheduled,authentik_events";
+          ExecStart = "${cfg.authentikComponents.celery}/bin/celery -A authentik.root.celery worker -Ofair --max-tasks-per-child=1 --autoscale 3,1 -E -B -s /tmp/celerybeat-schedule -Q authentik,authentik_scheduled,authentik_events";
         };
       };
       authentik = {
@@ -109,7 +119,7 @@ in
         ];
         restartTriggers = [ config.environment.etc."authentik/config.yml".source ];
         preStart = ''
-          ln -svf ${pkgs.authentik.staticWorkdirDeps}/* /var/lib/authentik/
+          ln -svf ${cfg.authentikComponents.staticWorkdirDeps}/* /var/lib/authentik/
         '';
         serviceConfig = {
           Environment = [
@@ -123,7 +133,7 @@ in
           # TODO /run might be sufficient
           WorkingDirectory = "%S/authentik";
           DynamicUser = true;
-          ExecStart = "${pkgs.authentik.gopkgs}/bin/server";
+          ExecStart = "${cfg.authentikComponents.gopkgs}/bin/server";
         };
       };
     };

test.nix

@@ -1,5 +1,4 @@
 { pkgs
-, overlays
 , nixosModules
 }:
 let
@@ -19,7 +18,6 @@ pkgs.nixosTest {
         "${pkgs.path}/nixos/tests/common/user-account.nix"
         "${pkgs.path}/nixos/tests/common/x11.nix"
       ];
-      nixpkgs.overlays = [ overlays.default ];
 
       services.authentik.enable = true;