93 lines
		
	
	
	
		
			3 KiB
		
	
	
	
		
			XML
		
	
	
	
	
	
			
		
		
	
	
			93 lines
		
	
	
	
		
			3 KiB
		
	
	
	
		
			XML
		
	
	
	
	
	
<refentry 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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          xml:id="sec-nix-channel">
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<refmeta>
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  <refentrytitle>nix-channel</refentrytitle>
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  <manvolnum>1</manvolnum>
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  <refmiscinfo class="source">Nix</refmiscinfo>
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  <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo>
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</refmeta>
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<refnamediv>
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  <refname>nix-channel</refname>
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  <refpurpose>manage Nix channels</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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  <cmdsynopsis>
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    <command>nix-channel</command>
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    <group choice='req'>
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      <arg choice='plain'><option>--add</option> <replaceable>url</replaceable></arg>
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      <arg choice='plain'><option>--remove</option> <replaceable>url</replaceable></arg>
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      <arg choice='plain'><option>--list</option></arg>
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      <arg choice='plain'><option>--update</option></arg>
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    </group>
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  </cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>A Nix channel is mechanism that allows you to automatically stay
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up-to-date with a set of pre-built Nix expressions.  A Nix channel is
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just a URL that points to a place that contains a set of Nix
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expressions, as well as a <command>nix-push</command> manifest.  See
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also <xref linkend="sec-channels" />.</para>
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<para>This command has the following operations:
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<variablelist>
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  <varlistentry><term><option>--add</option> <replaceable>url</replaceable></term>
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    <listitem><para>Adds <replaceable>url</replaceable> to the list of
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    subscribed channels.</para></listitem>
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  </varlistentry>
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  <varlistentry><term><option>--remove</option> <replaceable>url</replaceable></term>
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    <listitem><para>Removes <replaceable>url</replaceable> from the
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    list of subscribed channels.</para></listitem>
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  </varlistentry>
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  <varlistentry><term><option>--list</option></term>
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    <listitem><para>Prints the URLs of all subscribed channels on
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    standard output.</para></listitem>
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  </varlistentry>
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  <varlistentry><term><option>--update</option></term>
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    <listitem><para>Downloads the Nix expressions of all subscribed
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    channels, makes them the default for <command>nix-env</command>
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    operations (by symlinking them in the directory
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    <filename>~/.nix-defexpr</filename>), and performs a
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    <command>nix-pull</command> on the manifests of all channels to
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    make pre-built binaries available.</para></listitem>
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  </varlistentry>
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</variablelist>
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</para>
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<para>Note that <option>--add</option> and <option>--remove</option>
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do not automatically perform an update.</para>
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<para>The list of subscribed channels is stored in
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<filename>~/.nix-channels</filename>.</para>
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<para>A channel consists of two elements: a bzipped Tar archive
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containing the Nix expressions, and a manifest created by
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<command>nix-push</command>.  These must be stored under
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<literal><replaceable>url</replaceable>/nixexprs.tar.bz2</literal> and
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<literal><replaceable>url</replaceable>/MANIFEST</literal>,
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respectively.</para>
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</refsection>
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</refentry>
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