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<h1 id="serving-a-nix-store-via-ssh">Serving a Nix store via SSH</h1>
<p>You can tell Lix to automatically fetch needed binaries from a remote
Nix store via SSH. For example, the following installs Firefox,
automatically fetching any store paths in Firefoxs closure if they are
available on the server <code>avalon</code>:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix-env<span class="w"> </span>--install<span class="w"> </span>--attr<span class="w"> </span>nixpkgs.firefox<span class="w"> </span>--substituters<span class="w"> </span>ssh://alice@avalon
</code></pre></div>
<p>This works similar to the binary cache substituter that Lix usually
uses, only using SSH instead of HTTP: if a store path <code>P</code> is needed, Lix
will first check if its available in the Nix store on <code>avalon</code>. If not,
it will fall back to using the binary cache substituter, and then to
building from source.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The SSH substituter currently does not allow you to enter an SSH
passphrase interactively. Therefore, you should use <code>ssh-add</code> to load
the decrypted private key into <code>ssh-agent</code>.</p>
</div>
<p>You can also copy the closure of some store path, without installing it
into your profile, e.g.</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix-store<span class="w"> </span>--realise<span class="w"> </span>/nix/store/m85bxg…-firefox-34.0.5<span class="w"> </span>--substituters
<span class="go">ssh://alice@avalon</span>
</code></pre></div>
<p>This is essentially equivalent to doing</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>nix-copy-closure<span class="w"> </span>--from<span class="w"> </span>alice@avalon
<span class="go">/nix/store/m85bxg…-firefox-34.0.5</span>
</code></pre></div>
<p>You can use SSHs <em>forced command</em> feature to set up a restricted user
account for SSH substituter access, allowing read-only access to the
local Nix store, but nothing more. For example, add the following lines
to <code>sshd_config</code> to restrict the user <code>nix-ssh</code>:</p>
<div class="highlight"><pre><span></span><code>Match User nix-ssh
AllowAgentForwarding no
AllowTcpForwarding no
PermitTTY no
PermitTunnel no
X11Forwarding no
ForceCommand nix-store --serve
Match All
</code></pre></div>
<p>On NixOS, you can accomplish the same by adding the following to your
<code>configuration.nix</code>:</p>
<div class="highlight"><pre><span></span><code>nix<span class="o">.</span>sshServe<span class="o">.</span><span class="ss">enable</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
nix<span class="o">.</span>sshServe<span class="o">.</span><span class="ss">keys</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;ssh-dss AAAAB3NzaC1k... bob@example.org&quot;</span> <span class="p">];</span>
</code></pre></div>
<p>where the latter line lists the public keys of users that are allowed to
connect.</p>
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