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Merge pull request #2882 from grahamc/docs/1115-tarball-ttl

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tarball-ttl: document
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Eelco Dolstra 2019-07-06 00:15:27 +02:00 • committed by GitHub
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25
doc/manual/command-ref/conf-file.xml
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@ -864,6 +864,31 @@ requiredSystemFeatures = [ "kvm" ];
</varlistentry>
<varlistentry xml:id="conf-tarball-ttl"><term><literal>tarball-ttl</literal></term>
<listitem>
<para>Default: <literal>3600</literal> seconds.</para>
<para>The number of seconds a downloaded tarball is considered
fresh. If the cached tarball is stale, Nix will check whether
it is still up to date using the ETag header. Nix will download
a new version if the ETag header is unsupported, or the
cached ETag doesn't match.
</para>
<para>Setting the TTL to <literal>0</literal> forces Nix to always
check if the tarball is up to date.</para>
<para>Nix caches tarballs in
<filename>$XDG_CACHE_HOME/nix/tarballs</filename>.</para>
<para>Files fetched via <envar>NIX_PATH</envar>,
<function>fetchGit</function>, <function>fetchMercurial</function>,
<function>fetchTarball</function>, and <function>fetchurl</function>
respect this TTL.
</para>
</listitem>
</varlistentry>
<varlistentry xml:id="conf-timeout"><term><literal>timeout</literal></term>