refactor(guest): assemble guest modules

flake/default.nix

@@ -14,27 +14,23 @@ let
     root = self + "/modules";
   };
 
+  guestModules = guests.mkGuests {
+    root = self + "/guests";
+  };
+
   #----------------------------------------------------------
-  guestFiles = util.collectNixFiles (self + "/guests");
 
   collectedRegistry = registryAssembly.collect { hosts = self.nixosConfigurations; };
 
   specialArgs = {
     inherit
-      flake
       inputs
       self
+      util
       ;
     registry = collectedRegistry;
   };
 
-  flake = {
-    inherit (hosts) mkHosts;
-    inherit (guests) mkGuest;
-
-    inherit util;
-  };
-
   guests = import ./guest.nix {
     inherit
       inputs
@@ -51,10 +47,12 @@ let
       inputs
       lib
       specialArgs
-      guestFiles
+      guestModules
       registryAssembly
       ;
     repositoryModules = modules;
   };
 in
-flake
+{
+  inherit (hosts) mkHosts;
+}

flake/guest.nix

@@ -6,12 +6,9 @@
   registryAssembly,
   util,
 }:
-{
+let
   mkGuest =
-    {
-      name,
-      interior ? { },
-    }:
+    name:
     { config, lib, ... }:
     let
       cfg = config.guests.${name};
@@ -131,6 +128,11 @@
             Mounts are read-write unless `readOnly` is set.
           '';
         };
+        interior = lib.mkOption {
+          type = lib.types.deferredModule;
+          default = { };
+          description = "NixOS module imported into the guest interior.";
+        };
         limits = {
           memory = lib.mkOption {
             type = lib.types.nullOr lib.types.str;
@@ -246,7 +248,7 @@
 
               repositoryModules
               registryAssembly.module
-              interior
+              cfg.interior
 
               {
                 modules.guest.enable = true;
@@ -265,4 +267,16 @@
         };
       };
     };
+in
+{
+  mkGuests =
+    { root }:
+    let
+      files = util.collectNixFiles root;
+      guestFiles = lib.filterAttrs (file: type: type == "regular" && lib.hasSuffix ".nix" file) (builtins.readDir root);
+      names = map (file: lib.removeSuffix ".nix" file) (lib.attrNames guestFiles);
+    in
+    {
+      imports = files ++ map mkGuest names;
+    };
 }

flake/host.nix

@@ -4,8 +4,7 @@
   specialArgs,
   repositoryModules,
 
-  # TODO refactor guests
-  guestFiles,
+  guestModules,
   # TODO refactor registry
   registryAssembly,
 }:
@@ -17,24 +16,23 @@ let
     }:
     lib.nixosSystem {
       inherit specialArgs;
-      modules =
-        guestFiles
-        ++ [
-          inputs.chaotic.nixosModules.default
-          inputs.disko.nixosModules.disko
-          inputs.sops-nix.nixosModules.sops
-          inputs.stylix.nixosModules.stylix
+      modules = [
+        inputs.chaotic.nixosModules.default
+        inputs.disko.nixosModules.disko
+        inputs.sops-nix.nixosModules.sops
+        inputs.stylix.nixosModules.stylix
 
-          repositoryModules
+        repositoryModules
+        guestModules
 
-          # TODO: refactor
-          registryAssembly.module (root + "/${name}")
+        # TODO: refactor
+        registryAssembly.module (root + "/${name}")
 
-          {
-            networking.hostName = name;
-            modules.host.enable = true;
-          }
-        ];
+        {
+          networking.hostName = name;
+          modules.host.enable = true;
+        }
+      ];
     };
 in
 {

guests/actualbudget.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  flake,
   ...
 }:
 let
@@ -9,18 +8,6 @@ let
   dataDir = "/data";
 in
 {
-  imports = [
-    (flake.mkGuest {
-      name = "actualbudget";
-      interior = {
-        modules.services.actualbudget = {
-          enable = true;
-          inherit dataDir;
-        };
-      };
-    })
-  ];
-
   options.guests.actualbudget = {
     dataPath = lib.mkOption {
       type = lib.types.nullOr lib.types.str;
@@ -39,6 +26,12 @@ in
     ];
 
     guests.actualbudget = {
+      interior = {
+        modules.services.actualbudget = {
+          enable = true;
+          inherit dataDir;
+        };
+      };
       mounts.${dataDir}.directory = cfg.dataPath;
       limits = {
         memory = lib.mkDefault "2G";

guests/copyparty.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  flake,
   ...
 }:
 let
@@ -34,26 +33,6 @@ let
   };
 in
 {
-  imports = [
-    (flake.mkGuest {
-      name = "copyparty";
-      interior = {
-        modules.services.copyparty = {
-          enable = true;
-          inherit (cfg) accountName stateDir;
-          passwordFile = "/run/secrets/${cfg.passwordSecret}";
-          reverseProxy = {
-            enable = cfg.reverseProxy.enable;
-            inherit (cfg.reverseProxy) trustedSources;
-          };
-          volumes = lib.mapAttrs (_urlPath: volume: {
-            inherit (volume) path access flags;
-          }) cfg.volumes;
-        };
-      };
-    })
-  ];
-
   options.guests.copyparty = {
     accountName = lib.mkOption {
       type = lib.types.str;
@@ -106,6 +85,19 @@ in
     ];
 
     guests.copyparty = {
+      interior.modules.services.copyparty = {
+        enable = true;
+        inherit (cfg) accountName stateDir;
+        passwordFile = "/run/secrets/${cfg.passwordSecret}";
+        reverseProxy = {
+          enable = cfg.reverseProxy.enable;
+          inherit (cfg.reverseProxy) trustedSources;
+        };
+        volumes = lib.mapAttrs (_urlPath: volume: {
+          inherit (volume) path access flags;
+        }) cfg.volumes;
+      };
+
       mounts =
         {
           ${cfg.stateDir} = {

guests/reverse-proxy.nix

@@ -1,16 +1,14 @@
 {
   config,
   lib,
-  flake,
   ...
 }:
 let
   giteaSshBackend = "10.23.20.45:2022";
 in
 {
-  imports = [
-    (flake.mkGuest {
-      name = "reverse-proxy";
+  config = lib.mkIf config.guests.reverse-proxy.enable {
+    guests.reverse-proxy = {
       interior = {
         modules.services.reverse-proxy.enable = true;
 
@@ -66,11 +64,7 @@ in
           }
         '';
       };
-    })
-  ];
 
-  config = lib.mkIf config.guests.reverse-proxy.enable {
-    guests.reverse-proxy = {
       limits = {
         memory = lib.mkDefault "1G";
         cpu = lib.mkDefault "100%";

modules/default.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  flake,
   pkgs,
   inputs,
   ...
@@ -64,7 +63,7 @@ in
       useGlobalPkgs = true;
       useUserPackages = true;
       extraSpecialArgs = {
-        inherit flake inputs;
+        inherit inputs;
       };
       users.${user.name} = {
         home.username = user.name;

modules/network/vlans.nix

@@ -1,14 +1,14 @@
 {
   config,
   lib,
-  flake,
+  util,
   ...
 }:
 # The host networking foundation: per-VLAN bridges over a tagged trunk.
 let
   cfg = config.modules.network.vlans;
 
-  inherit (flake.util) bridgeName;
+  inherit (util) bridgeName;
 
   vlanName = id: "${cfg.trunk}.${toString id}";
 in