forked from lix-project/lix
* Remove references to __XXX primops.
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@ -77,18 +77,8 @@ attrValues = attrs: map (name: builtins.getAttr name attrs) (builtins.attrNames
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if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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This allows a Nix expression to fall back gracefully on older Nix
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installations that don’t have the desired built-in function.
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However, in that case you should not write
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<programlisting>
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if builtins ? getEnv then __getEnv "PATH" else ""</programlisting>
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This Nix expression will trigger an “undefined variable” error on
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older Nix versions since <function>__getEnv</function> doesn’t
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exist. <literal>builtins.getEnv</literal>, on the other hand, is
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safe since <literal>builtins</literal> always exists and attribute
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selection is lazy, so it’s only performed if the test
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succeeds.</para></listitem>
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installations that don’t have the desired built-in
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function.</para></listitem>
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</varlistentry>
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@ -251,14 +251,14 @@
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<programlisting>
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{ # The system (e.g., `i686-linux') for which to build the packages.
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system ? __currentSystem
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system ? builtins.currentSystem
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<replaceable>...</replaceable>
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}: <replaceable>...</replaceable></programlisting>
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So if you call this Nix expression (e.g., when you do
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<literal>nix-env -i <replaceable>pkgname</replaceable></literal>),
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the function will be called automatically using the value <link
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linkend='builtin-currentSystem'><literal>__currentSystem</literal></link>
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linkend='builtin-currentSystem'><literal>builtins.currentSystem</literal></link>
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for the <literal>system</literal> argument. You can override this
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using <option>--arg</option>, e.g., <literal>nix-env -i
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<replaceable>pkgname</replaceable> --arg system
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