system: Enable cachix for nix-community

cachix.nix

@@ -0,0 +1,14 @@
+
+# WARN: this file will get overwritten by $ cachix use <name>
+{ pkgs, lib, ... }:
+
+let
+  folder = ./cachix;
+  toImport = name: value: folder + ("/" + name);
+  filterCaches = key: value: value == "regular" && lib.hasSuffix ".nix" key;
+  imports = lib.mapAttrsToList toImport (lib.filterAttrs filterCaches (builtins.readDir folder));
+in {
+  inherit imports;
+  nix.binaryCaches = ["https://cache.nixos.org/"];
+}
+    

cachix/nix-community.nix

@@ -0,0 +1,12 @@
+
+{
+  nix = {
+    binaryCaches = [
+      "https://nix-community.cachix.org"
+    ];
+    binaryCachePublicKeys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+    ];
+  };
+}
+    

configuration.nix

@@ -10,8 +10,12 @@ let
   host-config = ./machines + "/${hostName}.nix";
   optionalPath = path: lib.lists.optional (builtins.pathExists path) path;
 in {
-  imports = [ <home-manager/nixos> ./hardware-configuration.nix ./local.nix ]
-    ++ optionalPath host-config;
+  imports = [
+    <home-manager/nixos>
+    ./hardware-configuration.nix
+    ./local.nix
+    ./cachix.nix
+  ] ++ optionalPath host-config;
 
   # Nix ######################################################################
   system.stateVersion = "20.03"; # Leave this alone (see configuration.nix(5))
@@ -119,6 +123,8 @@ in {
 
   # General ##################################################################
   environment.systemPackages = with pkgs; [
+    cachix
+
     wget
     vim
     git