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Merge pull request #3359 from bhipple/doc/pure-eval

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doc: mention how to turn on pure evaluation mode in manual
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Eelco Dolstra 2020-02-19 12:30:09 +01:00 committed by GitHub
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doc/manual/release-notes/rl-2.0.xml
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@ -503,14 +503,14 @@
</listitem> </listitem>
<listitem> <listitem>
<para><emphasis>Pure evaluation mode</emphasis>. This is a variant <para><emphasis>Pure evaluation mode</emphasis>. With the
of the existing restricted evaluation mode. In pure mode, the Nix <literal>--pure-eval</literal> flag, nix enables a variant of the existing
evaluator forbids access to anything that could cause different restricted evaluation mode that forbids access to anything that could cause
evaluations of the same command line arguments to produce a different evaluations of the same command line arguments to produce a
different result. This includes builtin functions such as different result. This includes builtin functions such as
<function>builtins.getEnv</function>, but more importantly, <function>builtins.getEnv</function>, but more importantly,
<emphasis>all</emphasis> filesystem or network access unless a <emphasis>all</emphasis> filesystem or network access unless a content hash
content hash or commit hash is specified. For example, calls to or commit hash is specified. For example, calls to
<function>builtins.fetchGit</function> are only allowed if a <function>builtins.fetchGit</function> are only allowed if a
<varname>rev</varname> attribute is specified.</para> <varname>rev</varname> attribute is specified.</para>