44 lines
1.5 KiB
XML
44 lines
1.5 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="sec-declarative-package-mgmt">
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<title>Declarative Package Management</title>
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<para>With declarative package management, you specify which packages
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you want on your system by setting the option
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<option>environment.systemPackages</option>. For instance, adding the
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following line to <filename>configuration.nix</filename> enables the
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Mozilla Thunderbird email application:
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<programlisting>
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environment.systemPackages = [ pkgs.thunderbird ];
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</programlisting>
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The effect of this specification is that the Thunderbird package from
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Nixpkgs will be built or downloaded as part of the system when you run
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<command>nixos-rebuild switch</command>.</para>
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<para>You can get a list of the available packages as follows:
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<screen>
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$ nix-env -qaP '*' --description
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nixos.pkgs.firefox firefox-23.0 Mozilla Firefox - the browser, reloaded
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<replaceable>...</replaceable>
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</screen>
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The first column in the output is the <emphasis>attribute
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name</emphasis>, such as
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<literal>nixos.pkgs.thunderbird</literal>. (The
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<literal>nixos</literal> prefix allows distinguishing between
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different channels that you might have.)</para>
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<para>To “uninstall” a package, simply remove it from
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<option>environment.systemPackages</option> and run
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<command>nixos-rebuild switch</command>.</para>
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<xi:include href="customizing-packages.xml" />
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<xi:include href="adding-custom-packages.xml" />
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</section>
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