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@ -90,6 +90,33 @@ derivation {
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</varlistentry>
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<varlistentry><term><varname>impureEnvVars</varname></term>
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<listitem><para>This attribute allows you to specify a list of
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environment variables that should be passed from the environment
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of the calling user to the builder. Usually, the environment is
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cleared completely when the builder is executed, but with this
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attribute you can allow specific environment variables to be
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passed unmodified. For example, <function>fetchurl</function> in
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Nixpkgs has the line
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<programlisting>
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impureEnvVars = [ "http_proxy" "https_proxy" <replaceable>...</replaceable> ];
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</programlisting>
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to make it use the proxy server configuration specified by the
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user in the environment variables <envar>http_proxy</envar> and
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friends.</para>
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<para>This attribute is only allowed in <link
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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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</varlistentry>
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<varlistentry xml:id="fixed-output-drvs">
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<term><varname>outputHash</varname></term>
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<term><varname>outputHashAlgo</varname></term>
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@ -215,33 +242,6 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><varname>impureEnvVars</varname></term>
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<listitem><para>This attribute allows you to specify a list of
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environment variables that should be passed from the environment
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of the calling user to the builder. Usually, the environment is
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cleared completely when the builder is executed, but with this
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attribute you can allow specific environment variables to be
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passed unmodified. For example, <function>fetchurl</function> in
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Nixpkgs has the line
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<programlisting>
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impureEnvVars = [ "http_proxy" "https_proxy" <replaceable>...</replaceable> ];
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</programlisting>
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to make it use the proxy server configuration specified by the
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user in the environment variables <envar>http_proxy</envar> and
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friends.</para>
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<para>This attribute is only allowed in <link
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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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</varlistentry>
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<varlistentry><term><varname>preferLocalBuild</varname></term>
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<listitem><para>If this attribute is set to
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