forked from lix-project/lix
Merge pull request #3359 from bhipple/doc/pure-eval
doc: mention how to turn on pure evaluation mode in manual
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@ -503,14 +503,14 @@
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</listitem>
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</listitem>
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<listitem>
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<listitem>
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<para><emphasis>Pure evaluation mode</emphasis>. This is a variant
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<para><emphasis>Pure evaluation mode</emphasis>. With the
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of the existing restricted evaluation mode. In pure mode, the Nix
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<literal>--pure-eval</literal> flag, nix enables a variant of the existing
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evaluator forbids access to anything that could cause different
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restricted evaluation mode that forbids access to anything that could cause
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evaluations of the same command line arguments to produce a
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different evaluations of the same command line arguments to produce a
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different result. This includes builtin functions such as
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different result. This includes builtin functions such as
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<function>builtins.getEnv</function>, but more importantly,
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<function>builtins.getEnv</function>, but more importantly,
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<emphasis>all</emphasis> filesystem or network access unless a
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<emphasis>all</emphasis> filesystem or network access unless a content hash
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content hash or commit hash is specified. For example, calls to
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or commit hash is specified. For example, calls to
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<function>builtins.fetchGit</function> are only allowed if a
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<function>builtins.fetchGit</function> are only allowed if a
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<varname>rev</varname> attribute is specified.</para>
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<varname>rev</varname> attribute is specified.</para>
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