flake-ify home-manager config with NUR and overlays

flake.nix

@@ -0,0 +1,56 @@
+{
+  description = "NixOS system flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11";
+    nixos-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
+    home-manager = {
+      url = "github:nix-community/home-manager/release-22.11";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    nur.url = "github:nix-community/NUR";
+    # TODO: possible make this a flake as well
+    mysecrets = {
+      flake = false;
+      url = "git+ssh://gitea@git.orlives.de:2342/schmittlauch/home-manager_secrets.git";
+    };
+
+  };
+
+  outputs = 
+  { self, nixpkgs, nur, ... }@inputs: 
+  let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in
+  {
+
+    nixosConfigurations.thinknix = nixpkgs.lib.nixosSystem {
+      inherit system;
+      modules = [ ./nixos/configuration.nix ];
+      # necessary to make the top-level inputs available to system configuration
+      specialArgs = { inherit inputs; };
+    };
+    homeConfigurations.spiollinux = inputs.home-manager.lib.homeManagerConfiguration {
+      inherit pkgs;
+
+      modules = [
+        {
+          imports = [
+            nur.hmModules.nur
+            ./home/home.nix
+          ];
+          # extends the home config
+          home.username = "spiollinux";
+          home.homeDirectory = "/home/spiollinux";
+        }
+      ];
+      # Optionally use extraSpecialArgs
+      # to pass through arguments to home.nix
+      extraSpecialArgs = {
+        inherit inputs;
+      };
+    };
+  };
+}

home/config.nix

@@ -1,7 +1,4 @@
-let 
-  lib = (import <nixpkgs> {}).lib;
-
-in
+{ lib, ...}:
 {
 
     firefox.enablePlasmaBrowserIntegration = true;

home/home.nix

@@ -1,12 +1,9 @@
-{ pkgs, ... }:
+{ pkgs, inputs, config, ... }:
 
 with pkgs;
 let
   # nix-channel --add https://nixos.org/channels/nixos-unstable nixos-unstable
-  unstable = import <nixos-unstable> { };
-  # nix-channel --add https://github.com/nix-community/NUR/archive/master.tar.gz NUR
-  nur = import <NUR> { inherit pkgs; };
-  myNur = nur.repos.schmittlauch;
+  unstable = inputs.nixos-unstable;
 
   desktopApps = [
     firefox
@@ -122,7 +119,7 @@ let
     reptyr # re-bind running program to other tty
     xclip
     unzip
-    myNur.lolcommits # from NUR
+    config.nur.repos.schmittlauch.lolcommits # from NUR
   ];
 
   nixHelpers = [
@@ -248,7 +245,7 @@ let
     (iosevka-bin.override {
       variant = "curly-slab";
     })
-    myNur.vollkorn
+    config.nur.repos.schmittlauch.vollkorn
     # TODO: humor-sans
   ];
 
@@ -260,6 +257,8 @@ let
 in
 {
 
+  nixpkgs.overlays = (import ./overlays.nix);
+
   home.packages =
     desktopApps
     ++ latexApps
@@ -276,7 +275,7 @@ in
 
   programs.home-manager.enable = true;
   programs.home-manager.path = "$HOME/.nix-defexpr/channels/home-manager";
-  home.stateVersion = "18.09";
+  home.stateVersion = "22.11";
 
   programs.direnv =
     {
@@ -302,7 +301,7 @@ in
       enable = true;
       # ssh host config
       matchBlocks =
-        import ./secrets/ssh_hosts.nix;
+        import "${inputs.mysecrets}/ssh_hosts.nix";
     };
 
   programs.tmux = {
@@ -331,7 +330,7 @@ in
   fonts.fontconfig.enable = true;
 
   programs.git =
-    let contacts = import ./secrets/contacts.nix;
+    let contacts = import "${inputs.mysecrets}/contacts.nix";
     in
     {
       enable = true;

nixos/configuration.nix

@@ -2,10 +2,10 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ config, pkgs, ... }:
+{ config, pkgs, lib, inputs, ... }:
 
 let
-  unstable = import <nixos-unstable> { };
+  unstable = inputs.nixos-unstable;
   localfork = import /home/spiollinux/src/nixpkgs { };
 
 in
@@ -234,8 +234,14 @@ in
   # Enable all sysrq functions (useful to recover from some issues):
   boot.kernel.sysctl."kernel.sysrq" = 1; # NixOS default: 16 (only the sync command)
 
+  nix = {
+    # expose all flake inputs through nix Path and registry
+    registry = (lib.mapAttrs (_: value: { flake = value; }) inputs) // {
+      nixpkgs.flake = inputs.nixpkgs;
+    };
+    nixPath = lib.mapAttrsToList (key: value: "${key}=${value.to.path}") config.nix.registry;
   # keep build-time deps around for offline-rebuilding
-  nix.settings = {
+    settings = {
       # keep around all inputs necessary for offline-rebuilding the system
       keep-outputs = true;
       keep-derivations = true;
@@ -244,6 +250,7 @@ in
       # use all cores for building
       cores = 0;
     };
+  };
   # override tmpdir for daemon
   #systemd.services.nix-daemon.environment.TMPDIR = "/var/tmp";
 

nixos/hardware-configuration.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, modulesPath, inputs, ... }:
 
 
 let
@@ -7,13 +7,8 @@ in
 {
   imports =
     [
-      <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
-      (
-        builtins.fetchGit {
-          url = "https://github.com/NixOS/nixos-hardware";
-          rev = "a4bc66709604ab78abc575b60baa6d23ae027a59";
-        } + "/lenovo/thinkpad/t440s"
-      )
+      (modulesPath + "/installer/scan/not-detected.nix")
+      (inputs.nixos-hardware + "/lenovo/thinkpad/t440s")
     ];
 
   boot.initrd.availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "usb_storage" "sd_mod" "rtsx_pci_sdmmc" ];