247 lines
7.3 KiB
XML
247 lines
7.3 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
|
xml:id="chap-packageconfig">
|
|
|
|
<title>Global configuration</title>
|
|
|
|
<para>Nix comes with certain defaults about what packages can and
|
|
cannot be installed, based on a package's metadata. By default, Nix
|
|
will prevent installation if any of the following criteria are
|
|
true:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem><para>The package is thought to be broken, and has had
|
|
its <literal>meta.broken</literal> set to
|
|
<literal>true</literal>.</para></listitem>
|
|
|
|
<listitem><para>The package's <literal>meta.license</literal> is set
|
|
to a license which is considered to be unfree.</para></listitem>
|
|
|
|
<listitem><para>The package has known security vulnerabilities but
|
|
has not or can not be updated for some reason, and a list of issues
|
|
has been entered in to the package's
|
|
<literal>meta.knownVulnerabilities</literal>.</para></listitem>
|
|
</itemizedlist>
|
|
|
|
<para>Note that all this is checked during evaluation already,
|
|
and the check includes any package that is evaluated.
|
|
In particular, all build-time dependencies are checked.
|
|
<literal>nix-env -qa</literal> will (attempt to) hide any packages
|
|
that would be refused.
|
|
</para>
|
|
|
|
<para>Each of these criteria can be altered in the nixpkgs
|
|
configuration.</para>
|
|
|
|
<para>The nixpkgs configuration for a NixOS system is set in the
|
|
<literal>configuration.nix</literal>, as in the following example:
|
|
<programlisting>
|
|
{
|
|
nixpkgs.config = {
|
|
allowUnfree = true;
|
|
};
|
|
}
|
|
</programlisting>
|
|
However, this does not allow unfree software for individual users.
|
|
Their configurations are managed separately.</para>
|
|
|
|
<para>A user's of nixpkgs configuration is stored in a user-specific
|
|
configuration file located at
|
|
<filename>~/.config/nixpkgs/config.nix</filename>. For example:
|
|
<programlisting>
|
|
{
|
|
allowUnfree = true;
|
|
}
|
|
</programlisting>
|
|
</para>
|
|
|
|
<section xml:id="sec-allow-broken">
|
|
<title>Installing broken packages</title>
|
|
|
|
|
|
<para>There are two ways to try compiling a package which has been
|
|
marked as broken.</para>
|
|
|
|
<itemizedlist>
|
|
<listitem><para>
|
|
For allowing the build of a broken package once, you can use an
|
|
environment variable for a single invocation of the nix tools:
|
|
|
|
<programlisting>$ export NIXPKGS_ALLOW_BROKEN=1</programlisting>
|
|
</para></listitem>
|
|
|
|
<listitem><para>
|
|
For permanently allowing broken packages to be built, you may
|
|
add <literal>allowBroken = true;</literal> to your user's
|
|
configuration file, like this:
|
|
|
|
<programlisting>
|
|
{
|
|
allowBroken = true;
|
|
}
|
|
</programlisting>
|
|
</para></listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<section xml:id="sec-allow-unfree">
|
|
<title>Installing unfree packages</title>
|
|
|
|
<para>There are several ways to tweak how Nix handles a package
|
|
which has been marked as unfree.</para>
|
|
|
|
<itemizedlist>
|
|
<listitem><para>
|
|
To temporarily allow all unfree packages, you can use an
|
|
environment variable for a single invocation of the nix tools:
|
|
|
|
<programlisting>$ export NIXPKGS_ALLOW_UNFREE=1</programlisting>
|
|
</para></listitem>
|
|
|
|
<listitem><para>
|
|
It is possible to permanently allow individual unfree packages,
|
|
while still blocking unfree packages by default using the
|
|
<literal>allowUnfreePredicate</literal> configuration
|
|
option in the user configuration file.</para>
|
|
|
|
<para>This option is a function which accepts a package as a
|
|
parameter, and returns a boolean. The following example
|
|
configuration accepts a package and always returns false:
|
|
<programlisting>
|
|
{
|
|
allowUnfreePredicate = (pkg: false);
|
|
}
|
|
</programlisting>
|
|
</para>
|
|
|
|
<para>A more useful example, the following configuration allows
|
|
only allows flash player and visual studio code:
|
|
|
|
<programlisting>
|
|
{
|
|
allowUnfreePredicate = (pkg: elem (builtins.parseDrvName pkg.name).name [ "flashplayer" "vscode" ]);
|
|
}
|
|
</programlisting>
|
|
</para></listitem>
|
|
|
|
<listitem>
|
|
<para>It is also possible to whitelist and blacklist licenses
|
|
that are specifically acceptable or not acceptable, using
|
|
<literal>whitelistedLicenses</literal> and
|
|
<literal>blacklistedLicenses</literal>, respectively.
|
|
</para>
|
|
|
|
<para>The following example configuration whitelists the
|
|
licenses <literal>amd</literal> and <literal>wtfpl</literal>:
|
|
|
|
<programlisting>
|
|
{
|
|
whitelistedLicenses = with stdenv.lib.licenses; [ amd wtfpl ];
|
|
}
|
|
</programlisting>
|
|
</para>
|
|
|
|
<para>The following example configuration blacklists the
|
|
<literal>gpl3</literal> and <literal>agpl3</literal> licenses:
|
|
|
|
<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 nixpkgs tree.</para>
|
|
</section>
|
|
|
|
|
|
<section xml:id="sec-allow-insecure">
|
|
<title>
|
|
Installing insecure packages
|
|
</title>
|
|
|
|
<para>There are several ways to tweak how Nix handles a package
|
|
which has been marked as insecure.</para>
|
|
|
|
<itemizedlist>
|
|
<listitem><para>
|
|
To temporarily allow all insecure packages, you can use an
|
|
environment variable for a single invocation of the nix tools:
|
|
|
|
<programlisting>$ export NIXPKGS_ALLOW_INSECURE=1</programlisting>
|
|
</para></listitem>
|
|
|
|
<listitem><para>
|
|
It is possible to permanently allow individual insecure
|
|
packages, while still blocking other insecure packages by
|
|
default using the <literal>permittedInsecurePackages</literal>
|
|
configuration option in the user configuration file.</para>
|
|
|
|
<para>The following example configuration permits the
|
|
installation of the hypothetically insecure package
|
|
<literal>hello</literal>, version <literal>1.2.3</literal>:
|
|
<programlisting>
|
|
{
|
|
permittedInsecurePackages = [
|
|
"hello-1.2.3"
|
|
];
|
|
}
|
|
</programlisting>
|
|
</para>
|
|
</listitem>
|
|
|
|
<listitem><para>
|
|
It is also possible to create a custom policy around which
|
|
insecure packages to allow and deny, by overriding the
|
|
<literal>allowInsecurePredicate</literal> configuration
|
|
option.</para>
|
|
|
|
<para>The <literal>allowInsecurePredicate</literal> option is a
|
|
function which accepts a package and returns a boolean, much
|
|
like <literal>allowUnfreePredicate</literal>.</para>
|
|
|
|
<para>The following configuration example only allows insecure
|
|
packages with very short names:
|
|
|
|
<programlisting>
|
|
{
|
|
allowInsecurePredicate = (pkg: (builtins.stringLength (builtins.parseDrvName pkg.name).name) <= 5);
|
|
}
|
|
</programlisting>
|
|
</para>
|
|
|
|
<para>Note that <literal>permittedInsecurePackages</literal> is
|
|
only checked if <literal>allowInsecurePredicate</literal> is not
|
|
specified.
|
|
</para></listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<!--============================================================-->
|
|
|
|
<section xml:id="sec-modify-via-packageOverrides"><title>Modify
|
|
packages via <literal>packageOverrides</literal></title>
|
|
|
|
<para>You can define a function called
|
|
<varname>packageOverrides</varname> in your local
|
|
<filename>~/.config/nixpkgs/config.nix</filename> to overide nix packages. It
|
|
must be a function that takes pkgs as an argument and return modified
|
|
set of packages.
|
|
|
|
<programlisting>
|
|
{
|
|
packageOverrides = pkgs: rec {
|
|
foo = pkgs.foo.override { ... };
|
|
};
|
|
}
|
|
</programlisting>
|
|
|
|
</para>
|
|
|
|
</section>
|
|
|
|
|
|
</chapter>
|