From 246ce7eeb11ea8803f29567e475d9249e5234dfa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?m=C3=BCde?= <git@darkest.space>
Date: Wed, 27 May 2026 18:06:06 +0200
Subject: [PATCH] only enable home manager binary caches if home manager is
 enabled

---
 nixosConfigurations.nix       |  5 ++++-
 nixosModules/extra-caches.nix | 18 ++++++++++++------
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/nixosConfigurations.nix b/nixosConfigurations.nix
index 6082283..6f6edce 100644
--- a/nixosConfigurations.nix
+++ b/nixosConfigurations.nix
@@ -72,7 +72,10 @@ forDevice (
           # keep-sorted start
           autoupdate.enable = true;
           distributedBuilds.enable = true;
-          extraCaches.enable = true;
+          extraCaches = {
+            enable = true;
+            homeManager = home-manager-users != { };
+          };
           git.enable = true;
           globalinstalls.enable = true;
           lixIsNix.enable = true;
diff --git a/nixosModules/extra-caches.nix b/nixosModules/extra-caches.nix
index 6a72755..8c45ede 100644
--- a/nixosModules/extra-caches.nix
+++ b/nixosModules/extra-caches.nix
@@ -1,27 +1,33 @@
 { lib, config, ... }:
+let
+  cfg = config.my.extraCaches;
+in
 {
-  options.my.extraCaches.enable = lib.mkEnableOption "extra Nix binary caches";
+  options.my.extraCaches = {
+    enable = lib.mkEnableOption "extra Nix binary caches";
+    homeManager = lib.mkEnableOption "the home-manager (nix-community) binary cache";
+  };
 
-  config = lib.mkIf config.my.extraCaches.enable {
+  config = lib.mkIf cfg.enable {
     nix.settings = {
       substituters = [
         # keep-sorted start
         "https://cache.lix.systems"
         "https://cache.nixos.org/"
         "https://niri.cachix.org"
-        "https://nix-community.cachix.org"
         "https://nixos-raspberrypi.cachix.org"
         # keep-sorted end
-      ];
+      ]
+      ++ lib.optional cfg.homeManager "https://nix-community.cachix.org";
       trusted-public-keys = [
         # keep-sorted start
         "cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
         "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
         "niri.cachix.org-1:Wv0OmO7PsuocRKzfDoJ3mulSl7Z6oezYhGhR+3W2964="
-        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
         "nixos-raspberrypi.cachix.org-1:4iMO9LXa8BqhU+Rpg6LQKiGa2lsNh/j2oiYLNOQ5sPI="
         # keep-sorted end
-      ];
+      ]
+      ++ lib.optional cfg.homeManager "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=";
     };
   };
 }