nixos/manual: clarify declarative packages section
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@ -14,9 +14,10 @@
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<programlisting>
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<xref linkend="opt-environment.systemPackages"/> = [ pkgs.thunderbird ];
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</programlisting>
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The effect of this specification is that the Thunderbird package from Nixpkgs
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will be built or downloaded as part of the system when you run
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<command>nixos-rebuild switch</command>.
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The <literal>pkgs</literal> variable is used to reference packages in your
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root channel. The effect of this specification is that the Thunderbird
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package from your root Nixpkgs channel will be built or downloaded as part of
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the system when you run <command>nixos-rebuild switch</command>.
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</para>
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<para>
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@ -27,8 +28,10 @@ nixos.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 name</emphasis>,
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such as <literal>nixos.thunderbird</literal>. (The <literal>nixos</literal>
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prefix allows distinguishing between different channels that you might have.)
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such as <literal>nixos.thunderbird</literal>. The <literal>nixos</literal>
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prefix tells us that we want to get the package from the `nixos` channel.
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Some systems have other channels installed, such as `nixpkgs` or custom
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channels for development purposes.
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</para>
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<para>
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