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1<chapter xmlns="http://docbook.org/ns/docbook"
2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude"
4 version="5.0"
5 xml:id="sec-package-management">
6
7<title>Package Management</title>
8
9<para>This section describes how to add additional packages to your
10system. NixOS has two distinct styles of package management:
11
12<itemizedlist>
13
14 <listitem><para><emphasis>Declarative</emphasis>, where you declare
15 what packages you want in your
16 <filename>configuration.nix</filename>. Every time you run
17 <command>nixos-rebuild</command>, NixOS will ensure that you get a
18 consistent set of binaries corresponding to your
19 specification.</para></listitem>
20
21 <listitem><para><emphasis>Ad hoc</emphasis>, where you install,
22 upgrade and uninstall packages via the <command>nix-env</command>
23 command. This style allows mixing packages from different Nixpkgs
24 versions. It’s the only choice for non-root
25 users.</para></listitem>
26
27</itemizedlist>
28
29</para>
30
31<xi:include href="declarative-packages.xml" />
32<xi:include href="ad-hoc-packages.xml" />
33
34</chapter>