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Explain fetchTarball timeout behavior in the doc

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Michael Mercier 2018-05-16 17:48:36 +02:00 committed by Graham Christensen
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11
doc/manual/expressions/builtins.xml
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@ -280,8 +280,17 @@ with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixo
stdenv.mkDerivation { … }
</programlisting>
</para>
Note that when obtaining the hash with <varname>nix-prefetch-url
<para>The fetched tarball is cached for a certain amount of time
(1 hour by default) in <filename>~/.cache/nix/tarballs/</filename>.
You can change the cache timeout either on the command line with
<option>--option tarball-ttl <replaceable>number of seconds</replaceable></option> or
in the Nix configuration file with this option:
<literal>tarball-ttl <replaceable>number of seconds to cache</replaceable></literal>.
</para>
<para>Note that when obtaining the hash with <varname>nix-prefetch-url
</varname> the option <varname>--unpack</varname> is required.
</para>