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