55 lines
2.1 KiB
XML
55 lines
2.1 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
|
version="5.0"
|
|
xml:id="sec-declarative-package-mgmt">
|
|
<title>Declarative Package Management</title>
|
|
|
|
<para>
|
|
With declarative package management, you specify which packages you want on
|
|
your system by setting the option
|
|
<xref linkend="opt-environment.systemPackages"/>. For instance, adding the
|
|
following line to <filename>configuration.nix</filename> enables the Mozilla
|
|
Thunderbird email application:
|
|
<programlisting>
|
|
<xref linkend="opt-environment.systemPackages"/> = [ pkgs.thunderbird ];
|
|
</programlisting>
|
|
The effect of this specification is that the Thunderbird package from Nixpkgs
|
|
will be built or downloaded as part of the system when you run
|
|
<command>nixos-rebuild switch</command>.
|
|
</para>
|
|
|
|
<note>
|
|
<para>
|
|
Some packages require additional global configuration such as D-Bus or systemd service registration so adding them to <xref linkend="opt-environment.systemPackages"/> might not be sufficient. You are advised to check the <link xlink:href="#ch-options">list of options</link> whether a NixOS module for the package does not exist.
|
|
</para>
|
|
</note>
|
|
|
|
<para>
|
|
You can get a list of the available packages as follows:
|
|
<screen>
|
|
<prompt>$ </prompt>nix-env -qaP '*' --description
|
|
nixos.firefox firefox-23.0 Mozilla Firefox - the browser, reloaded
|
|
<replaceable>...</replaceable>
|
|
</screen>
|
|
The first column in the output is the <emphasis>attribute name</emphasis>,
|
|
such as <literal>nixos.thunderbird</literal>.
|
|
</para>
|
|
<para>
|
|
Note: the <literal>nixos</literal> prefix tells us that we want to get the
|
|
package from the <literal>nixos</literal> channel and works only in CLI tools.
|
|
|
|
In declarative configuration use <literal>pkgs</literal> prefix (variable).
|
|
</para>
|
|
|
|
<para>
|
|
To “uninstall” a package, simply remove it from
|
|
<xref linkend="opt-environment.systemPackages"/> and run
|
|
<command>nixos-rebuild switch</command>.
|
|
</para>
|
|
|
|
<xi:include href="customizing-packages.xml" />
|
|
|
|
<xi:include href="../from_md/configuration/adding-custom-packages.section.xml" />
|
|
</section>
|