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-<refentry xmlns="http://docbook.org/ns/docbook"
-          xmlns:xlink="http://www.w3.org/1999/xlink"
-          xmlns:xi="http://www.w3.org/2001/XInclude"
-          xml:id="sec-nix-copy-closure">
-
-<refmeta>
-  <refentrytitle>nix-copy-closure</refentrytitle>
-  <manvolnum>1</manvolnum>
-  <refmiscinfo class="source">Nix</refmiscinfo>
-  <refmiscinfo class="version"><xi:include href="../version.txt" parse="text"/></refmiscinfo>
-</refmeta>
-
-<refnamediv>
-  <refname>nix-copy-closure</refname>
-  <refpurpose>copy a closure to or from a remote machine via SSH</refpurpose>
-</refnamediv>
-
-<refsynopsisdiv>
-  <cmdsynopsis>
-    <command>nix-copy-closure</command>
-    <group>
-      <arg choice='plain'><option>--to</option></arg>
-      <arg choice='plain'><option>--from</option></arg>
-    </group>
-    <arg><option>--gzip</option></arg>
-    <!--
-    <arg><option>- -show-progress</option></arg>
-    -->
-    <arg><option>--include-outputs</option></arg>
-    <group>
-      <arg choice='plain'><option>--use-substitutes</option></arg>
-      <arg choice='plain'><option>-s</option></arg>
-    </group>
-    <arg><option>-v</option></arg>
-    <arg choice='plain'>
-      <emphasis>user@</emphasis><emphasis>machine</emphasis>
-    </arg>
-    <arg choice='plain'><emphasis>paths</emphasis></arg>
-  </cmdsynopsis>
-</refsynopsisdiv>
-
-
-<refsection><title>Description</title>
-
-<para><command>nix-copy-closure</command> gives you an easy and
-efficient way to exchange software between machines.  Given one or
-more Nix store <emphasis>paths</emphasis> on the local
-machine, <command>nix-copy-closure</command> computes the closure of
-those paths (i.e. all their dependencies in the Nix store), and copies
-all paths in the closure to the remote machine via the
-<command>ssh</command> (Secure Shell) command.  With the
-<option>--from</option>, the direction is reversed:
-the closure of <emphasis>paths</emphasis> on a remote machine is
-copied to the Nix store on the local machine.</para>
-
-<para>This command is efficient because it only sends the store paths
-that are missing on the target machine.</para>
-
-<para>Since <command>nix-copy-closure</command> calls
-<command>ssh</command>, you may be asked to type in the appropriate
-password or passphrase.  In fact, you may be asked
-<emphasis>twice</emphasis> because <command>nix-copy-closure</command>
-currently connects twice to the remote machine, first to get the set
-of paths missing on the target machine, and second to send the dump of
-those paths.  If this bothers you, use
-<command>ssh-agent</command>.</para>
-
-
-<refsection><title>Options</title>
-
-<variablelist>
-
-  <varlistentry><term><option>--to</option></term>
-
-    <listitem><para>Copy the closure of
-    <emphasis>paths</emphasis> from the local Nix store to the
-    Nix store on <emphasis>machine</emphasis>.  This is the
-    default.</para></listitem>
-
-  </varlistentry>
-
-  <varlistentry><term><option>--from</option></term>
-
-    <listitem><para>Copy the closure of
-    <emphasis>paths</emphasis> from the Nix store on
-    <emphasis>machine</emphasis> to the local Nix
-    store.</para></listitem>
-
-  </varlistentry>
-
-  <varlistentry><term><option>--gzip</option></term>
-
-    <listitem><para>Enable compression of the SSH
-    connection.</para></listitem>
-
-  </varlistentry>
-
-  <varlistentry><term><option>--include-outputs</option></term>
-
-    <listitem><para>Also copy the outputs of store derivations
-    included in the closure.</para></listitem>
-
-  </varlistentry>
-
-  <varlistentry><term><option>--use-substitutes</option> / <option>-s</option></term>
-
-    <listitem><para>Attempt to download missing paths on the target
-    machine using Nix’s substitute mechanism.  Any paths that cannot
-    be substituted on the target are still copied normally from the
-    source.  This is useful, for instance, if the connection between
-    the source and target machine is slow, but the connection between
-    the target machine and <literal>nixos.org</literal> (the default
-    binary cache server) is fast.</para></listitem>
-
-  </varlistentry>
-
-  <varlistentry><term><option>-v</option></term>
-
-    <listitem><para>Show verbose output.</para></listitem>
-
-  </varlistentry>
-
-</variablelist>
-
-</refsection>
-
-
-<refsection><title>Environment variables</title>
-
-<variablelist>
-
-  <varlistentry><term><literal>NIX_SSHOPTS</literal></term>
-
-    <listitem><para>Additional options to be passed to
-    <command>ssh</command> on the command line.</para></listitem>
-
-  </varlistentry>
-
-</variablelist>
-
-</refsection>
-
-
-<refsection><title>Examples</title>
-
-<para>Copy Firefox with all its dependencies to a remote machine:
-
-<screen>
-$ nix-copy-closure --to alice@itchy.labs $(type -tP firefox)</screen>
-
-</para>
-
-<para>Copy Subversion from a remote machine and then install it into a
-user environment:
-
-<screen>
-$ nix-copy-closure --from alice@itchy.labs \
-    /nix/store/0dj0503hjxy5mbwlafv1rsbdiyx1gkdy-subversion-1.4.4
-$ nix-env -i /nix/store/0dj0503hjxy5mbwlafv1rsbdiyx1gkdy-subversion-1.4.4
-</screen>
-
-</para>
-
-</refsection>
-
-
-</refsection>
-
-</refentry>