From 9d40f5bf03dc1e0fbc59156c051e398c302d685a Mon Sep 17 00:00:00 2001
From: Mark Nipper <nipsy@bitgnome.net>
Date: Fri, 25 Oct 2024 00:22:45 -0700
Subject: Ensure build TMPDIR consistency

---
 hosts/common/core/nix.nix | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/hosts/common/core/nix.nix b/hosts/common/core/nix.nix
index 99aff56..a989f03 100644
--- a/hosts/common/core/nix.nix
+++ b/hosts/common/core/nix.nix
@@ -1,22 +1,18 @@
-{ inputs, lib, ... }: {
+{ inputs, lib, ... }: 
+
+let
+  build-tmp = "/var/tmp";
+in {
 
   nix = {
     settings = {
       auto-optimise-store = lib.mkDefault true;
-      build-dir = "/var/tmp";
+      build-dir = build-tmp;
       experimental-features = [ "nix-command" "flakes" ];
-      #flake-registry = ""; # Disable global flake registry   This is a hold-over setting from Misterio77. Not sure significance but likely to do with nix.registry entry below.
       trusted-users = [ "root" "@wheel" ];
       warn-dirty = false;
     };
 
-    # Add each flake input as a registry to make nix3 commands consistent with your flake
-    #registry = lib.mapAttrs (_: value: { flake = value; }) inputs;
-
-    # Add nixpkgs input to NIX_PATH
-    # This lets nix2 commands still use <nixpkgs>
-    #nixPath = [ "nixpkgs=${inputs.nixpkgs.outPath}" ];
-
     # Garbage Collection
     gc = {
       automatic = true;
@@ -27,4 +23,7 @@
     };
 
   };
+
+  systemd.services."nix-daemon".environment.TMPDIR = build-tmp;
+
 }
-- 
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