From 398510f601cb1a1978a393814514f9ca9fbcfe72 Mon Sep 17 00:00:00 2001
From: Malo Bourgon <mbourgon@gmail.com>
Date: Mon, 25 Mar 2024 16:34:10 -0700
Subject: Add `nix.optimise` module

---
 modules/system/checks.nix | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'modules/system')

diff --git a/modules/system/checks.nix b/modules/system/checks.nix
index 27188e3..5989dc4 100644
--- a/modules/system/checks.nix
+++ b/modules/system/checks.nix
@@ -191,6 +191,17 @@ let
         exit 2
     fi
   '';
+
+  nixStoreOptimiser = ''
+    if test -O /nix/store; then
+        echo "error: A single-user install can't run optimiser as root, aborting activation" >&2
+        echo "Configure the optimiser to run as the current user:" >&2
+        echo >&2
+        echo "    nix.optimiser.user = \"$USER\";" >&2
+        echo >&2
+        exit 2
+    fi
+  '';
 in
 
 {
@@ -230,6 +241,7 @@ in
       (mkIf (!config.nix.useDaemon) singleUser)
       nixStore
       (mkIf (config.nix.gc.automatic && config.nix.gc.user == null) nixGarbageCollector)
+      (mkIf (config.nix.optimise.automatic && config.nix.optimise.user == null) nixStoreOptimiser)
       (mkIf cfg.verifyNixChannels nixChannels)
       nixInstaller
       (mkIf cfg.verifyNixPath nixPath)
-- 
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