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<meta name="description" content="On Arch gpg-agent comes with the gnupg package so no other package is needed if gpg is already installed. I use gpg-agent for temporarily caching the PIN for my Yubikey so that I don't have to type it everytime as well as for ssh-agent emulation. Setup Add the following lines …">
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<h1 class="article-title" id="setting-up-gpg-agent">Setting up gpg-agent</h1>
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Sun 30 April 2017
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<span><a href="/pages/about.html">Nils Amiet</a></span>
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<a class="badge bg-azure text-white"
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<div class="card-body">
<p>On Arch <code>gpg-agent</code> comes with the <code>gnupg</code> package so no other package is needed if <code>gpg</code> is already installed.</p>
<p>I use <code>gpg-agent</code> for temporarily caching the PIN for my <a href="https://www.yubico.com/products/yubikey-hardware/">Yubikey</a> so that I don't have to type it everytime as well as for ssh-agent emulation.</p>
<h4>Setup</h4>
<p>Add the following lines to your <code>~/.bashrc</code>:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># Set GPG TTY</span>
<span class="nb">export</span><span class="w"> </span><span class="nv">GPG_TTY</span><span class="o">=</span><span class="k">$(</span>tty<span class="k">)</span>
<span class="c1"># Refresh gpg-agent tty in case user switches into an X session</span>
gpg-connect-agent<span class="w"> </span>updatestartuptty<span class="w"> </span>/bye<span class="w"> </span>>/dev/null
<span class="c1"># Set SSH to use gpg-agent</span>
<span class="nb">unset</span><span class="w"> </span>SSH_AGENT_PID
<span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">gnupg_SSH_AUTH_SOCK_by</span><span class="k">:-</span><span class="nv">0</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span>-ne<span class="w"> </span><span class="nv">$$</span><span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span><span class="nb">export</span><span class="w"> </span><span class="nv">SSH_AUTH_SOCK</span><span class="o">=</span><span class="s2">"/run/user/</span><span class="nv">$UID</span><span class="s2">/gnupg/S.gpg-agent.ssh"</span>
<span class="k">fi</span>
<span class="c1"># Start the gpg-agent if not already running</span>
<span class="k">if</span><span class="w"> </span>!<span class="w"> </span>pgrep<span class="w"> </span>-x<span class="w"> </span>-u<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">USER</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span>gpg-agent<span class="w"> </span>>/dev/null<span class="w"> </span><span class="m">2</span>><span class="p">&</span><span class="m">1</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span>gpg-connect-agent<span class="w"> </span>/bye<span class="w"> </span>>/dev/null<span class="w"> </span><span class="m">2</span>><span class="p">&</span><span class="m">1</span>
<span class="k">fi</span>
</code></pre></div>
<p>Add these lines to <code>~/.gnupg/gpg-agent.conf</code>:</p>
<div class="highlight"><pre><span></span><code>enable-ssh-support
default-cache-ttl 10800
</code></pre></div>
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