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24b715d16d
By checking if the package name appears in a list, this new example allows for easy user-customization.
110 lines
2.8 KiB
XML
110 lines
2.8 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xml:id="chap-packageconfig">
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<title><filename>~/.nixpkgs/config.nix</filename>: global configuration</title>
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<para>Nix packages can be configured to allow or deny certain options.</para>
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<para>To apply the configuration edit
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<filename>~/.nixpkgs/config.nix</filename> and set it like
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<programlisting>
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{
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allowUnfree = true;
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}
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</programlisting>
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and will allow the Nix package manager to install unfree licensed packages.</para>
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<para>The configuration as listed also applies to NixOS under
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<option>nixpkgs.config</option> set.</para>
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<itemizedlist>
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<listitem>
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<para>Allow installing of packages that are distributed under
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unfree license by setting <programlisting>allowUnfree =
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true;</programlisting> or deny them by setting it to
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<literal>false</literal>.</para>
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<para>Same can be achieved by setting the environment variable:
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<programlisting>
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$ export NIXPKGS_ALLOW_UNFREE=1
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</programlisting>
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</para>
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</listitem>
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<listitem>
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<para>Whenever unfree packages are not allowed, single packages
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can still be allowed by a predicate function that accepts package
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as an argument and should return a boolean:
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<programlisting>
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allowUnfreePredicate = (pkg: ...);
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</programlisting>
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Example to allow flash player and visual studio code only:
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<programlisting>
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allowUnfreePredicate = with builtins; (pkg: elem (parseDrvName pkg.name).name [ "flashplayer" "vscode" ]);
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</programlisting>
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</para>
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</listitem>
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<listitem>
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<para>Whenever unfree packages are not allowed, packages can still
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be whitelisted by their license:
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<programlisting>
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whitelistedLicenses = with stdenv.lib.licenses; [ amd wtfpl ];
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</programlisting>
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</para>
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</listitem>
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<listitem>
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<para>In addition to whitelisting licenses which are denied by the
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<literal>allowUnfree</literal> setting, you can also explicitely
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deny installation of packages which have a certain license:
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<programlisting>
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blacklistedLicenses = with stdenv.lib.licenses; [ agpl3 gpl3 ];
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</programlisting>
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</para>
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</listitem>
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</itemizedlist>
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<para>A complete list of licenses can be found in the file
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<filename>lib/licenses.nix</filename> of the nix package tree.</para>
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<!--============================================================-->
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<section xml:id="sec-modify-via-packageOverrides"><title>Modify
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packages via <literal>packageOverrides</literal></title>
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<para>You can define a function called
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<varname>packageOverrides</varname> in your local
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<filename>~/.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
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set of packages.
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<programlisting>
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{
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packageOverrides = pkgs: rec {
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foo = pkgs.foo.override { ... };
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};
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}
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</programlisting>
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</para>
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</section>
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</chapter>
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