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Bring back mkOrder

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This commit is contained in:
Eelco Dolstra 2014-03-30 20:35:25 +02:00
parent 0fdd641b21
commit 0469f92faf
2 changed files with 43 additions and 7 deletions
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16
nixos/doc/manual/configuration.xml
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@ -443,8 +443,20 @@ Note that both <filename>configuration.nix</filename> and
define an option, NixOS will try to <emphasis>merge</emphasis> the
definitions. In the case of
<option>environment.systemPackages</option>, that’s easy: the lists of
packages can simply be concatenated. For other types of options, a
merge may not be possible: for instance, if two modules define
packages can simply be concatenated. The value in
<filename>configuration.nix</filename> is merged last, so for
list-type options, it will appear at the end of the merged list. If
you want it to appear first, you can use <varname>mkBefore</varname>:
<programlisting>
boot.kernelModules = mkBefore [ "kvm-intel" ];
</programlisting>
This causes the <literal>kvm-intel</literal> kernel module to be
loaded before any other kernel modules.</para>
<para>For other types of options, a merge may not be possible. For
instance, if two modules define
<option>services.httpd.adminAddr</option>,
<command>nixos-rebuild</command> will give an error: