From 57f145a7f8c3bd01e5ac1927cb0e1b14658fa7aa Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 27 Nov 2013 12:41:43 +0100
Subject: [PATCH] When setting $NIX_REMOTE, check whether /nix/var/nix/db is
 writable

In NixOS containers, root doesn't have write permission to
/nix/var/nix/db, so it has to use the daemon.
---
 nixos/modules/services/misc/nix-daemon.nix | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/nixos/modules/services/misc/nix-daemon.nix b/nixos/modules/services/misc/nix-daemon.nix
index 1aefe75931b1..cca42aa11009 100644
--- a/nixos/modules/services/misc/nix-daemon.nix
+++ b/nixos/modules/services/misc/nix-daemon.nix
@@ -334,10 +334,8 @@ in
       ''
         # Set up secure multi-user builds: non-root users build through the
         # Nix daemon.
-        if test "$USER" != root; then
+        if [ "$USER" != root -o ! -w /nix/var/nix/db ]; then
             export NIX_REMOTE=daemon
-        else
-            export NIX_REMOTE=
         fi
       '';