Rename directory flake to flake-parts

flake-parts/hosts.nix

@@ -0,0 +1,59 @@
+{
+  inputs,
+  self,
+  lib,
+  ...
+}:
+let
+  mkHost =
+    hostName:
+    inputs.nixpkgs.lib.nixosSystem {
+      specialArgs = { inherit inputs self; };
+      modules =
+        let
+          hostFiles =
+            "${self}/hosts/${hostName}"
+            |> lib.filesystem.listFilesRecursive
+            |> lib.filter (lib.hasSuffix ".nix");
+
+          userFiles =
+            "${self}/users"
+            |> builtins.readDir
+            |> lib.filterAttrs (_: type: type == "directory")
+            |> lib.attrNames
+            |> map (user: "${self}/users/${user}/@${hostName}")
+            |> lib.filter (path: lib.pathExists path);
+        in
+        [
+          { networking = { inherit hostName; }; }
+          "${self}/hosts/common.nix"
+        ]
+        ++ hostFiles
+        ++ userFiles;
+    };
+
+  mkDeployNode = hostname: {
+    inherit hostname;
+    sshUser = "root";
+    profiles.system.path =
+      inputs.deploy-rs.lib.x86_64-linux.activate.nixos
+        self.nixosConfigurations.${hostname};
+  };
+in
+{
+  flake = {
+    nixosConfigurations =
+      "${self}/hosts"
+      |> builtins.readDir
+      |> lib.filterAttrs (_: type: type == "directory")
+      |> lib.mapAttrs (name: _: mkHost name);
+
+    deploy.nodes =
+      "${self}/hosts"
+      |> builtins.readDir
+      |> lib.filterAttrs (_: type: type == "directory")
+      |> lib.mapAttrs (name: _: mkDeployNode name);
+
+    checks = lib.mapAttrs (_: deployLib: deployLib.deployChecks self.deploy) inputs.deploy-rs.lib;
+  };
+}