nixpkgs/doc/functions/prefer-remote-fetch.xml

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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/xinclude"
xml:id="sec-prefer-remote-fetch">
<title>prefer-remote-fetch overlay</title>
<para>
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<function>prefer-remote-fetch</function> is an overlay that download sources on remote builder. This is useful when the evaluating machine has a slow upload while the builder can fetch faster directly from the source. To use it, put the following snippet as a new overlay:
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<programlisting>
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self: super:
(super.prefer-remote-fetch self super)
</programlisting>
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A full configuration example for that sets the overlay up for your own account, could look like this
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<screen>
<prompt>$ </prompt>mkdir ~/.config/nixpkgs/overlays/
<prompt>$ </prompt>cat &gt; ~/.config/nixpkgs/overlays/prefer-remote-fetch.nix &lt;&lt;EOF
self: super: super.prefer-remote-fetch self super
EOF
</screen>
</para>
</section>