From 5ba6395378e6e92266bba0dd46e3cf3ab6e2fce8 Mon Sep 17 00:00:00 2001
From: Gleb Peregud <gleber.p@gmail.com>
Date: Wed, 2 May 2018 22:07:23 +0200
Subject: docs: mention source of env variables used by `impureEnvVars`.

---
 doc/manual/expressions/advanced-attributes.xml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'doc')

diff --git a/doc/manual/expressions/advanced-attributes.xml b/doc/manual/expressions/advanced-attributes.xml
index f3cf98371302..dfd013b5cf31 100644
--- a/doc/manual/expressions/advanced-attributes.xml
+++ b/doc/manual/expressions/advanced-attributes.xml
@@ -112,7 +112,13 @@ impureEnvVars = [ "http_proxy" "https_proxy" <replaceable>...</replaceable> ];
     linkend="fixed-output-drvs">fixed-output derivations</link>, where
     impurities such as these are okay since (the hash of) the output
     is known in advance.  It is ignored for all other
-    derivations.</para></listitem>
+    derivations.</para>
+
+    <warning><para><varname>impureEnvVars</varname> implementation takes
+    environment variables from the current builder process. When a daemon is
+    building its environmental variables are used. Without the daemon, the
+    environmental variables come from the environment of the
+    <command>nix-build</command>.</para></warning></listitem>
 
   </varlistentry>
 
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