docker-mailserver/edge/config/advanced/override-defaults/user-patches/index.html
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<h1>Modifications via Script</h1>
<p>If you'd like to change, patch or alter files or behavior of <code>docker-mailserver</code>, you can use a script.</p>
<p>In case you cloned this repository, you can copy the file <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/config-examples/user-patches.sh"><code>user-patches.sh.dist</code> (<em>under <code>config/</code></em>)</a> with <code class="highlight">cp<span class="w"> </span>config/user-patches.sh.dist<span class="w"> </span>docker-data/dms/config/user-patches.sh</code> in order to create the <code>user-patches.sh</code> script.</p>
<p>If you are managing your directory structure yourself, create a <code>docker-data/dms/config/</code> directory and add the <code>user-patches.sh</code> file yourself.</p>
<div class="highlight"><pre><span></span><code><span class="c1"># 1. Either create the docker-data/dms/config/ directory yourself</span>
<span class="c1"># or let docker-mailserver create it on initial startup</span>
/tmp<span class="w"> </span>$<span class="w"> </span>mkdir<span class="w"> </span>-p<span class="w"> </span>docker-data/dms/config/<span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="nb">cd</span><span class="w"> </span>docker-data/dms/config/
<span class="c1"># 2. Create the user-patches.sh file and edit it</span>
/tmp/docker-data/dms/config<span class="w"> </span>$<span class="w"> </span>touch<span class="w"> </span>user-patches.sh
/tmp/docker-data/dms/config<span class="w"> </span>$<span class="w"> </span>nano<span class="w"> </span>user-patches.sh
</code></pre></div>
<p>The contents could look like this:</p>
<div class="highlight"><pre><span></span><code><span class="ch">#!/bin/bash</span>
cat<span class="w"> </span>&gt;/etc/amavis/conf.d/50-user<span class="w"> </span>&lt;&lt;<span class="w"> </span><span class="s2">&quot;END&quot;</span>
use<span class="w"> </span>strict<span class="p">;</span>
<span class="nv">$undecipherable_subject_tag</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>undef<span class="p">;</span>
<span class="nv">$admin_maps_by_ccat</span><span class="o">{</span>+CC_UNCHECKED<span class="o">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>undef<span class="p">;</span>
<span class="c1">#------------ Do not modify anything below this line -------------</span>
<span class="m">1</span><span class="p">;</span><span class="w"> </span><span class="c1"># ensure a defined return</span>
END
</code></pre></div>
<p>And you're done. The user patches script runs right before starting daemons. That means, all the other configuration is in place, so the script can make final adjustments.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Many "patches" can already be done with the Docker Compose-/Stack-file. Adding hostnames to <code>/etc/hosts</code> is done with the <code class="highlight"><span class="nt">extra_hosts</span><span class="p">:</span></code> section, <code>sysctl</code> commands can be managed with the <code class="highlight"><span class="nt">sysctls</span><span class="p">:</span></code> section, etc.</p>
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