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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'>
<replaceable>user@</replaceable><replaceable>machine</replaceable>
</arg>
<arg choice='plain'><replaceable>paths</replaceable></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 <replaceable>paths</replaceable> 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 <replaceable>paths</replaceable> 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
<replaceable>paths</replaceable> from the local Nix store to the
Nix store on <replaceable>machine</replaceable>. This is the
default.</para></listitem>
</varlistentry>
<varlistentry><term><option>--from</option></term>
<listitem><para>Copy the closure of
<replaceable>paths</replaceable> from the Nix store on
<replaceable>machine</replaceable> 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><envar>NIX_SSHOPTS</envar></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>
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