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Diffstat (limited to 'doc/manual/command-ref/conf-file.xml')
| -rw-r--r-- | doc/manual/command-ref/conf-file.xml | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/manual/command-ref/conf-file.xml b/doc/manual/command-ref/conf-file.xml index fd09883be..e9947ebc6 100644 --- a/doc/manual/command-ref/conf-file.xml +++ b/doc/manual/command-ref/conf-file.xml @@ -757,6 +757,33 @@ password <replaceable>my-password</replaceable> </varlistentry> + <varlistentry xml:id="conf-system-features"><term><literal>system-features</literal></term> + + <listitem><para>A set of system “features” supported by this + machine, e.g. <literal>kvm</literal>. Derivations can express a + dependency on such features through the derivation attribute + <varname>requiredSystemFeatures</varname>. For example, the + attribute + +<programlisting> +requiredSystemFeatures = [ "kvm" ]; +</programlisting> + + ensures that the derivation can only be built on a machine with + the <literal>kvm</literal> feature.</para> + + <para>This setting by default includes <literal>kvm</literal> if + <filename>/dev/kvm</filename> is accessible, and the + pseudo-features <literal>nixos-test</literal>, + <literal>benchmark</literal> and <literal>big-parallel</literal> + that are used in Nixpkgs to route builds to specific + machines.</para> + + </listitem> + + </varlistentry> + + <varlistentry xml:id="conf-timeout"><term><literal>timeout</literal></term> <listitem> |