From 3070c887987e9c24a72a5b7b18db29ebe1ed6d4c Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 3 Mar 2017 15:42:53 +0100
Subject: [PATCH] Fix incorrect $NIX_BUILD_HOOK on Nix 1.12

---
 nixos/modules/services/misc/nix-daemon.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/misc/nix-daemon.nix b/nixos/modules/services/misc/nix-daemon.nix
index 7101cadfeed2..66ee20b5ac94 100644
--- a/nixos/modules/services/misc/nix-daemon.nix
+++ b/nixos/modules/services/misc/nix-daemon.nix
@@ -389,7 +389,11 @@ in
       }
 
       // optionalAttrs cfg.distributedBuilds {
-        NIX_BUILD_HOOK = "${nix}/libexec/nix/build-remote.pl";
+        NIX_BUILD_HOOK =
+          if versionAtLeast (getVersion nix) "1.12pre4997" then
+            "${nix}/libexec/nix/build-remote"
+          else
+            "${nix}/libexec/nix/build-remote.pl";
         NIX_REMOTE_SYSTEMS = "/etc/nix/machines";
         NIX_CURRENT_LOAD = "/run/nix/current-load";
       };