nix: switching to using flakes

.dotter/global.toml

@@ -58,3 +58,4 @@ xmonad = "~/.xmonad"
 [nix.files]
 "direnvrc" = "~/.config/direnv/direnvrc"
 "nix/configuration.nix" = "/etc/nixos/configuration.nix"
+"nix/flake.nix" = "/etc/nixos/flake.nix"

nix/configuration.nix

@@ -6,7 +6,7 @@
 
 {
   imports = [ # Include the results of the hardware scan.
-    /etc/nixos/hardware-configuration.nix
+    ./hardware-configuration.nix
   ];
 
   # Bootloader.
@@ -139,9 +139,9 @@
 
   # Allow unfree packages
   nixpkgs.config.allowUnfree = true;
-  nixpkgs.config.packageOverrides = pkgs: {
+  # nixpkgs.config.packageOverrides = pkgs: {
-    unstable = import <nixos-unstable> { config = config.nixpkgs.config; };
+  #   unstable = import <nixos-unstable> { config = config.nixpkgs.config; };
-  };
+  # };
 
   environment.etc."manual-links/xfce4-notifyd".source =
     "${pkgs.xfce.xfce4-notifyd}/lib/xfce4/notifyd/xfce4-notifyd";

nix/flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1678872516,
+        "narHash": "sha256-/E1YwtMtFAu2KUQKV/1+KFuReYPANM2Rzehk84VxVoc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9b8e5abb18324c7fe9f07cb100c3cd4a29cda8b8",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-22.11",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1678898370,
+        "narHash": "sha256-xTICr1j+uat5hk9FyuPOFGxpWHdJRibwZC+ATi0RbtE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ac718d02867a84b42522a0ece52d841188208f2c",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-unstable": "nixpkgs-unstable"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

nix/flake.nix

@@ -0,0 +1,29 @@
+  {
+    inputs.nixpkgs.url = "nixpkgs/nixos-22.11";
+    inputs.nixpkgs-unstable.url = "nixpkgs/nixos-unstable";
+
+    # inputs.home-manager.url = "github:nix-community/home-manager";
+
+    outputs = { self, nixpkgs, nixpkgs-unstable, ... }@attrs:
+      let
+        system = "x86_64-linux";
+        overlay-unstable = final: prev: {
+          unstable = nixpkgs-unstable.legacyPackages.${prev.system};
+          # use this variant if unfree packages are needed:
+          # unstable = import nixpkgs-unstable {
+          #   inherit system;
+          #   config.allowUnfree = true;
+          # };
+        };
+      in {
+        nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
+          inherit system;
+          specialArgs = attrs;
+          modules = [
+            # Overlays-module makes "pkgs.unstable" available in configuration.nix
+            ({ config, pkgs, ... }: { nixpkgs.overlays = [ overlay-unstable ]; })
+            ./configuration.nix
+          ];
+        };
+      };
+  }

nix/hardware-configuration.nix

@@ -0,0 +1,42 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ehci_pci" "ahci" "xhci_pci" "usbhid" "usb_storage" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/7469546c-44d6-44a7-aecd-28aae51c84ca";
+      fsType = "ext4";
+    };
+
+  fileSystems."/boot/efi" =
+    { device = "/dev/disk/by-uuid/5A58-A8EB";
+      fsType = "vfat";
+    };
+
+  fileSystems."/home" =
+    { device = "/dev/disk/by-uuid/232d00ae-a844-4b59-97e9-d7248ff179a4";
+      fsType = "btrfs";
+    };
+
+  swapDevices = [ { device = "/swapfile"; } ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp4s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}