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Merge pull request #2132 from gleber/docs-impureEnvVars-env-source
docs: mention source of env variables used by `impureEnvVars`.
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@ -112,7 +112,13 @@ impureEnvVars = [ "http_proxy" "https_proxy" <replaceable>...</replaceable> ];
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linkend="fixed-output-drvs">fixed-output derivations</link>, where
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impurities such as these are okay since (the hash of) the output
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is known in advance. It is ignored for all other
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derivations.</para></listitem>
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derivations.</para>
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<warning><para><varname>impureEnvVars</varname> implementation takes
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environment variables from the current builder process. When a daemon is
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building its environmental variables are used. Without the daemon, the
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environmental variables come from the environment of the
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<command>nix-build</command>.</para></warning></listitem>
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</varlistentry>
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