[bug#41704] [PATCH V2] services: nix: Set NIX_CONF_DIR environment variable.

[Peng Mei Yu <pengmeiyu@riseup.net>]

* gnu/services/nix.scm (nix-shepherd-service): Set NIX_CONF_DIR environment
variable to "/etc/nix".
---
 gnu/services/nix.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gnu/services/nix.scm b/gnu/services/nix.scm
index dfe33991d0..d5a057d2ee 100644
--- a/gnu/services/nix.scm
+++ b/gnu/services/nix.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2019 Oleg Pykhalov <go.wigust@gmail.com>
+;;; Copyright © 2020 Peng Mei Yu <pengmeiyu@riseup.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -96,7 +97,9 @@ GID."
     (documentation "Run nix-daemon.")
     (requirement '())
     (start #~(make-forkexec-constructor
-              (list (string-append #$nix "/bin/nix-daemon"))))
+              (list (string-append #$nix "/bin/nix-daemon"))
+              #:environment-variables
+              '("NIX_CONF_DIR=/etc/nix")))
     (respawn? #f)
     (stop #~(make-kill-destructor)))))
 
-- 
2.26.2