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<li><a href="#create-the-repository">Create the repository</a></li>
<li><a href="#serve-the-repo-locally">Serve the repo locally</a></li>
<li><a href="#create-the-flashable-image">Create the flashable image</a>
<ul>
<li><a href="#funtoo-based-system">Funtoo based system</a></li>
<li><a href="#raspbian-based-system">Raspbian based system</a></li>
</ul>
</li>
<li><a href="#add-packages">Add packages</a></li>
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<h1>ARM images</h1>
<div class="lead">Use Luet to build, track, and release OTA update for your embedded devices.</div>
<header class="article-meta">
</header>
<div class="alert alert-warning" role="alert">
<h4 class="alert-heading">Warning</h4>
This article is outdated.
Please refer to the <a href="../../tutorials/hello_world/">&ldquo;Hello World&rdquo;</a> tutorial instead.
</div>
<p>Here we show an example on how to build &ldquo;burnable&rdquo; SD images for Raspberry Pi with Luet. This approach lets you describe and version OTA upgrades for your embedded devices, delivering upgrades as layer upgrades on the Pi.</p>
<p>The other good side of the medal is that you can build a Luet package repository with multiple distributions (e.g. <code>Raspbian</code>, <code>OpenSUSE</code>, <code>Gentoo</code>, &hellip; ) and switch among them in runtime. In the above example <code>Raspbian</code> and <code>Funtoo</code> (at the time of writing) are available.</p>
<h2 id="prerequisites">Prerequisites</h2>
<p>You have to run the following steps inside an ARM board to produce arm-compatible binaries. Any distribution with Docker will work. Note that the same steps could be done in a cross-compilation approach, or with qemu-binfmt in a amd64 host.</p>
<p>You will also need in your host:</p>
<ul>
<li>Docker</li>
<li>Luet installed (+container-diff) in <code>/usr/bin/luet</code> (arm build)</li>
<li>make</li>
</ul>
<h2 id="build-the-packages">Build the packages</h2>
<p>Clone the repository <a href="https://github.com/Luet-lab/luet-embedded">https://github.com/Luet-lab/luet-embedded</a></p>
<pre><code>$&gt; git clone https://github.com/Luet-lab/luet-embedded
$&gt; cd luet-embedded
$&gt; sudo make build-all
...
</code></pre>
<p>If a rebuild is needed, just do <code>sudo make rebuild-all</code> after applying the changes.</p>
<h2 id="create-the-repository">Create the repository</h2>
<pre><code>$&gt; sudo make create-repo
...
</code></pre>
<h2 id="serve-the-repo-locally">Serve the repo locally</h2>
<pre><code>$&gt; make serve-repo
...
</code></pre>
<h2 id="create-the-flashable-image">Create the flashable image</h2>
<h3 id="funtoo-based-system">Funtoo based system</h3>
<pre><code>$&gt; sudo LUET_PACKAGES='distro/funtoo-1.4 distro/raspbian-boot-0.20191208 system/luet-develop-0.5' make image
...
</code></pre>
<h3 id="raspbian-based-system">Raspbian based system</h3>
<pre><code>$&gt; sudo LUET_PACKAGES='distro/raspbian-0.20191208 distro/raspbian-boot-0.20191208 system/luet-develop-0.5' make image
...
</code></pre>
<p>At the end of the process, a file <code>luet_os.img</code>, ready to be flashed to an SD card, should be present in the current directory.</p>
<h2 id="add-packages">Add packages</h2>
<p>In order to build and add <a href="/docs/docs/concepts/packages/">packages</a> to the exiting repository, simply add or edit the <a href="/docs/docs/concepts/specfile">specfiles</a> under the <code>distro</code> folder. When doing <code>make rebuild-all</code> the packages will be automatically compiled and made available to the local repository.</p>
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