experimental flake support

configuration.nix

@@ -8,24 +8,19 @@
 #   nix-option   ##  query options -- including their SET VALUE; similar to search: https://search.nixos.org/options
 #   nixos-rebuild switch --upgrade   ## pull changes from the nixos channel (e.g. security updates) and rebuild
 
-{ config, lib, modulesPath, pkgs, specialArgs, options }:
+{ config, modulesPath, pkgs, specialArgs, options }:
 
-let
-  pkgsUnstable = import (builtins.fetchTarball {
-    # Descriptive name to make the store path easier to identify
-    name = "nixos-unstable-2022-05-05";
-    # Commit hash for master on above date (s/commits/archive and append .tar.gz)
-    # see https://github.com/NixOS/nixpkgs/commits/nixos-unstable
-    url = "https://github.com/NixOS/nixpkgs/archive/c777cdf5c564015d5f63b09cc93bef4178b19b01.tar.gz";
-    # Hash obtained using `nix-prefetch-url --unpack <url>`
-    sha256 = "0r2xhflcy5agaz4a3b8pxiyiwh32s1kl3swv73flnj1x3v69s8bm";
-  }) {};
-in
 {
-  imports = [
+
-    ./cfg
+  # enable flake support.
-    ./modules
+  # the real config root lives in flake.nix
-  ];
+  nix = {
+    #package = pkgs.nixFlakes;
+    package = pkgs.nixUnstable;
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };
 
   nixpkgs.overlays = [
     (self: super: {
@@ -41,10 +36,10 @@ in
       # gitea: 1.16.5 contains a fix which makes manual user approval *actually* work.
       # https://github.com/go-gitea/gitea/pull/19119
       # safe to remove after 1.16.5 (or 1.16.7 if we need db compat?)
-      gitea = pkgsUnstable.gitea;
+      gitea = pkgs.unstable.gitea;
 
       # try a newer rpi4 u-boot
-      # ubootRaspberryPi4_64bit = pkgsUnstable.ubootRaspberryPi4_64bit;
+      # ubootRaspberryPi4_64bit = pkgs.unstable.ubootRaspberryPi4_64bit;
       ubootRaspberryPi4_64bit = self.callPackage ./pkgs/ubootRaspberryPi4_64bit { pkgs = super; };
     })
   ];

flake.nix

@@ -0,0 +1,39 @@
+# docs:
+#   https://nixos.wiki/wiki/Flakes
+#   https://serokell.io/blog/practical-nix-flakes
+
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-21.11";
+    pkgsUnstable.url = "nixpkgs/c777cdf5c564015d5f63b09cc93bef4178b19b01";
+  };
+  outputs = { self, pkgsUnstable, nixpkgs }: {
+    nixosConfigurations.uninsane = nixpkgs.lib.nixosSystem {
+      inherit (self.packages.aarch64-linux) pkgs;
+      pkgs.unstable = pkgsUnstable;
+      system = "aarch64-linux";
+      modules = [
+        ./configuration.nix
+        ./cfg
+        ./modules
+      ];
+    };
+    packages = nixpkgs.lib.genAttrs nixpkgs.lib.platforms.all (system:
+      {
+        pkgs = import nixpkgs { inherit system; config.allowUnfree = true; };
+      }
+    );
+    # flake-utils.lib.eachDefaultSystem (system:
+    #   let pkgs = nixpkgs.legacyPackages.${system};
+    #   in {
+    #     # packages.hello = pkgs.hello;
+
+    #     # devShell = pkgs.mkShell { buildInputs = [ pkgs.hello pkgs.cowsay ]; };
+    #     nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
+    #       system = "${system}";
+    #     };
+    #   }
+    # );
+  };
+}
+