From a203683694dab21acb2072818c9ba2ff509f9c86 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Sun, 26 Jan 2020 12:39:16 +0100
Subject: [PATCH] Remove hydra cache, add enableBinaryCache to hq module

The Hydra is dead, NixOS machines cannot rely on services hosted from the
Proxmox. Add a enableBinaryCache option to the hq module to enable caching
from Server7.
---
 lib/default.nix | 41 ++++++++++++++++++++++++++++++++---------
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/lib/default.nix b/lib/default.nix
index 906c8a33..f465791d 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -91,6 +91,14 @@ in {
 
         statistics = { enable = mkEnableOption "statistics collection"; };
 
+        enableBinaryCache = mkOption {
+          type = bool;
+          default = cfg.isInHq;
+          defaultText = literalExample "config.c3d2.isInHq";
+          description = "Whether to enable the local Nix binary cache";
+        };
+
+
       };
 
     };
@@ -101,15 +109,21 @@ in {
     mkIfIsInHq = lib.mkIf cfg.isInHq;
   in {
 
-    assertions = [{
-      assertion = let
-        check = hostName: hostName == config.networking.hostName;
-        checkRegistry = list: builtins.any check list;
-      in cfg.isInHq -> checkRegistry hostRegistry.hqLocal;
-      message = "${config.networking.hostName} is not registered in ${
-          toString ../host-registry.nix
-        }";
-    }];
+    assertions = [
+      {
+        assertion = let
+          check = hostName: hostName == config.networking.hostName;
+          checkRegistry = list: builtins.any check list;
+        in cfg.isInHq -> checkRegistry hostRegistry.hqLocal;
+        message = "${config.networking.hostName} is not registered in ${
+            toString ../host-registry.nix
+          }";
+      }
+      {
+        assertion = cfg.hq.enableBinaryCache -> cfg.mapHqHosts;
+        message = "mapHqHosts must be enabled for enableBinaryCache";
+      }
+    ];
 
     networking.defaultGateway = mkIfIsInHq "172.22.99.4";
 
@@ -224,6 +238,15 @@ in {
       # Only builds > 19.09
     };
 
+    nix = lib.mkIf
+      (cfg.hq.enableBinaryCache && config.networking.hostName != "server7") {
+        binaryCaches =
+          [ "http://server7.hq:${toString config.services.nix-serve.port}" ];
+        binaryCachePublicKeys = [
+          "cache.server7.hq.c3d2.de:x8JLRG26zRZ8ysYZLEkPxuAYuK1VSJi/aMAEIs2Lv+U="
+        ];
+      };
+
   };
 
   meta.maintainers = with lib.maintainers; [ ehmry ];