Build caching.

agents/fj-hetzner-aarch64.nix

@@ -1,5 +1,8 @@
 { pkgs, config, lib, ... }:
  {
+  imports = [
+    ../cachix.nix
+  ];
   environment.systemPackages = with pkgs; [ 
     # vim -- added by srvos.nixosModules.server
     # git -- srvos.nixosModules.server

agents/fj-shadowfax-x86_64.nix

@@ -1,5 +1,8 @@
 { pkgs, config, lib, ... }:
  {
+  imports = [
+    ../cachix.nix
+  ];
   environment.systemPackages = with pkgs; [ 
     # vim -- added by srvos.nixosModules.server
     # git -- srvos.nixosModules.server

cachix.nix

@@ -0,0 +1,16 @@
+
+# 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/"];
+    builders-use-substitutes = true;
+  };
+}

cachix/hsndev.nix

@@ -0,0 +1,13 @@
+
+{
+  nix = {
+    settings = {
+      substituters = [
+        "https://hsndev.cachix.org"
+      ];
+      trusted-public-keys = [
+        "hsndev.cachix.org-1:vN1/XGBZtMLnTFYDmTLDrullgZHSUYY3Kqt+Yg/C+tE="
+      ];
+    };
+  };
+}

cachix/nix-community.nix

@@ -0,0 +1,13 @@
+
+{
+  nix = {
+    settings = {
+      substituters = [
+        "https://nix-community.cachix.org"
+      ];
+      trusted-public-keys = [
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      ];
+    };
+  };
+}

cachix/numtide.nix

@@ -0,0 +1,13 @@
+
+{
+  nix = {
+    settings = {
+      substituters = [
+        "https://numtide.cachix.org"
+      ];
+      trusted-public-keys = [
+        "numtide.cachix.org-1:2ps1kLBUWjxIneOy1Ik6cQjb41X0iXVXeHigGmycPPE="
+      ];
+    };
+  };
+}