Configure cachix automatically on NixOS

nixos/cachix.nix

@@ -0,0 +1,13 @@
+
+# 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.settings.substituters = ["https://cache.nixos.org/"];
+}

nixos/cachix/traxys.nix

@@ -0,0 +1,13 @@
+
+{
+  nix = {
+    settings = {
+      substituters = [
+        "https://traxys.cachix.org"
+      ];
+      trusted-public-keys = [
+        "traxys.cachix.org-1:8Qir8lQJdhzUaw5AE7ICom/IB25wgdheZFxdMln7Qgg="
+      ];
+    };
+  };
+}

nixos/configuration.nix

@@ -12,6 +12,7 @@
     ./pkg.nix
     #./home.nix
     ./localcfg.nix
+	./cachix.nix
   ];
 
   # The global useDHCP flag is deprecated, therefore explicitly set to false here.