nixpkgs/doc/configuration.xml

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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
xml:id="chap-packageconfig">
<title>Global configuration</title>
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<para>Nix packages can be configured to allow or deny certain options.</para>
<para>To apply the configuration edit
<filename>~/.config/nixpkgs/config.nix</filename> and set it like
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<programlisting>
{
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allowUnfree = true;
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}
</programlisting>
and will allow the Nix package manager to install unfree licensed packages.</para>
<para>The configuration as listed also applies to NixOS under
<option>nixpkgs.config</option> set.</para>
<itemizedlist>
<listitem>
<para>Allow installing of packages that are distributed under
unfree license by setting <programlisting>allowUnfree =
true;</programlisting> or deny them by setting it to
<literal>false</literal>.</para>
<para>Same can be achieved by setting the environment variable:
<programlisting>
$ export NIXPKGS_ALLOW_UNFREE=1
</programlisting>
</para>
</listitem>
<listitem>
<para>Whenever unfree packages are not allowed, single packages
can still be allowed by a predicate function that accepts package
as an argument and should return a boolean:
<programlisting>
allowUnfreePredicate = (pkg: ...);
</programlisting>
Example to allow flash player and visual studio code only:
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<programlisting>
allowUnfreePredicate = with builtins; (pkg: elem (parseDrvName pkg.name).name [ "flashplayer" "vscode" ]);
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</programlisting>
</para>
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</listitem>
<listitem>
<para>Whenever unfree packages are not allowed, packages can still
be whitelisted by their license:
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<programlisting>
whitelistedLicenses = with stdenv.lib.licenses; [ amd wtfpl ];
</programlisting>
</para>
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</listitem>
<listitem>
<para>In addition to whitelisting licenses which are denied by the
<literal>allowUnfree</literal> setting, you can also explicitely
deny installation of packages which have a certain license:
<programlisting>
blacklistedLicenses = with stdenv.lib.licenses; [ agpl3 gpl3 ];
</programlisting>
</para>
</listitem>
</itemizedlist>
<para>A complete list of licenses can be found in the file
<filename>lib/licenses.nix</filename> of the nix package tree.</para>
<!--============================================================-->
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<section xml:id="sec-modify-via-packageOverrides"><title>Modify
packages via <literal>packageOverrides</literal></title>
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<para>You can define a function called
<varname>packageOverrides</varname> in your local
<filename>~/.config/nixpkgs/config.nix</filename> to overide nix packages. It
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must be a function that takes pkgs as an argument and return modified
set of packages.
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<programlisting>
{
packageOverrides = pkgs: rec {
foo = pkgs.foo.override { ... };
};
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}
</programlisting>
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</para>
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</section>
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</chapter>