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<h1 id="extensions">Extensions<a class="headerlink" href="#extensions" title="Permanent link">&para;</a></h1>
<blockquote>
<p>&ldquo;I&rsquo;m gonna create a <code>prepare_bootloader</code> hook [in core] so we can refactor <code>u-boot</code> [into an extension]&rdquo;</p>
</blockquote>
<p>The extensions framework allows the board/family developers, extension authors, and users to extend the Armbian build system without overloading the core with specific functionality.</p>
<p>It&rsquo;s a simple framework, written in Bash, that <strong>works based on function naming conventions</strong>. It provides the core and the extensions with tracing and debugging, (error control,?) inline documentation and very simple dependency resolution.</p>
<h3 id="terminology">Terminology<a class="headerlink" href="#terminology" title="Permanent link">&para;</a></h3>
<ul>
<li>The &ldquo;core&rdquo; is everything that&rsquo;s in <code>lib/</code> directory plus <code>compile.sh</code> and some others. It&rsquo;s the spine of the build system.</li>
<li>An &ldquo;extension&rdquo; is a separate Bash source file that contains exclusively functions. Extensions live in <code>extensions/</code> or <code>userpatches/extensions/</code> directory, but could one day be in a separate repository too.</li>
<li>An &ldquo;extension method&rdquo; (a.k.a &ldquo;hook&rdquo;) is used by the core to call extensions, via <code>call_extension_method()</code>. This will discover all enabled extension methods implementations, order them, and call them one by one.
- The Armbian core already has quite a few of these in strategic spots.
- More are coming as they&rsquo;re identified.</li>
<li>An &ldquo;extension method implementation&rdquo; is a function that will be called when it&rsquo;s extension method is called. It can be defined in extensions, but also in board config, family config, user config, etc.</li>
</ul>
<h4 id="example">Example<a class="headerlink" href="#example" title="Permanent link">&para;</a></h4>
<h5 id="core-calls-extensions">Core calls extensions<a class="headerlink" href="#core-calls-extensions" title="Permanent link">&para;</a></h5>
<p>The Armbian core build system has an extension method called <code>run_after_build</code>, also known as the &ldquo;<code>run_after_build</code> hook&rdquo;. You can find it in <code>lib/main.sh</code> around line 546.</p>
<div class="language-bash highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Bash</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1">1</a></span>
<span class="normal"><a href="#__codelineno-0-2">2</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="c1"># in lib/main.sh:546</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a>call_extension_method<span class="w"> </span><span class="s2">&quot;run_after_build&quot;</span><span class="w"> </span><span class="o">[</span>...<span class="o">]</span>
</span></code></pre></div></td></tr></table></div>
<h5 id="extension-method-implementation">Extension method implementation<a class="headerlink" href="#extension-method-implementation" title="Permanent link">&para;</a></h5>
<p>Consider the following function:</p>
<div class="language-bash highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Bash</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1">1</a></span>
<span class="normal"><a href="#__codelineno-1-2">2</a></span>
<span class="normal"><a href="#__codelineno-1-3">3</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="k">function</span><span class="w"> </span>run_after_build__say_congratulations<span class="o">()</span><span class="w"> </span><span class="o">{</span><span class="w"> </span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a><span class="w"> </span><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Congrats, the build is finished!&quot;</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="o">}</span>
</span></code></pre></div></td></tr></table></div>
<p>Such a function is an &ldquo;extension method implementation&rdquo; called <code>say_congratulations</code> for the extension method <code>run_after_build</code>.</p>
<h5 id="extension-file">Extension file<a class="headerlink" href="#extension-file" title="Permanent link">&para;</a></h5>
<p>A file <code>userpatches/extensions/be-festive.sh</code> containing the above function is an &ldquo;extension&rdquo; called <code>be-festive</code>.</p>
<h5 id="using-it">Using it<a class="headerlink" href="#using-it" title="Permanent link">&para;</a></h5>
<p>An user of the build system can enable that extension by adding a call to <code>enable_extension "be-festive"</code> on his configuration file, or by passing <code>ENABLE_EXTENSIONS=be-festive</code> as a parameter to the build.</p>
<h3 id="naming-conventions-and-ordering">Naming conventions and ordering<a class="headerlink" href="#naming-conventions-and-ordering" title="Permanent link">&para;</a></h3>
<p>An extension method implementation is just a Bash function that follows the pattern <code>run_after_build__say_congratulations</code> where</p>
<ul>
<li><code>run_after_build</code> is the name of the extension method.</li>
<li><code>__</code> is a marker/separator &ndash; very important &ndash; two underscores, not one, not three.</li>
<li><code>say_congratulations</code> is the name of the extension method implementation, and should be unique.</li>
</ul>
<p>The system will &ldquo;magically&rdquo; compose a single <code>run_after_build()</code> function, based on all the hook functions that begin with <code>run_after_build__</code>.</p>
<p>Hook functions will be sorted by their numerical value; hook functions that do not begin with a number will receive <code>500_</code> prefix automatically.</p>
<p>So the examples <code>run_after_build__do_this</code> and <code>run_after_build__500_do_this</code> are equivalent, and will run</p>
<ul>
<li>sooner than <code>run_after_build__900_do_smth_else</code></li>
<li>later than <code>run_after_build__300_do_even_another_thing</code></li>
</ul>
<h3 id="what-is-an-extension">What is an <em>extension</em>?<a class="headerlink" href="#what-is-an-extension" title="Permanent link">&para;</a></h3>
<p>A extension is Bash source file that contains <strong>exclusively</strong>:</p>
<ul>
<li>function definitions:
- extension method implementation definitions (with <code>__</code> separator)
- other internal functions (for structure and clarity if needed)</li>
<li>calls to <code>enable_extension "another-extension"</code> at the top of the file.
- that&rsquo;s a very simple dependency system, one extension can enable another.</li>
</ul>
<p>Specifically, <strong>extension files should not contain any code outside of functions</strong> &ndash; they should do nothing when sourced.</p>
<p>Extensions can be official Armbian fragments and live in <code>/extensions</code>, or can be user-specific
in <code>/userpatches/extensions</code>.</p>
<p>An extension could be implemented in any of the following file/dir structures:</p>
<ul>
<li><code>/extensions/our-ext.sh</code> - an official, single-file extension.</li>
<li><code>/userpatches/extensions/my-ext.sh</code> - a user-specific, single-file extension.</li>
<li><code>/extensions/our-dir-ext/our-dir-ext.sh</code> - an official, directory-based extension.</li>
<li><code>/userpatches/extensions/my-dir-ext/my-dir-ext.sh</code> - a user-specific, directory-based extensions.</li>
</ul>
<p>The official extensions can be used by boards, family includes, etc, while the user-specific extensions can only be used by userpatches code or via <code>ENABLE_EXTENSIONS=my-ext,my-dir-ext</code> build parameter.</p>
<h4 id="single-file-vs-directory-based">Single-file vs Directory-based<a class="headerlink" href="#single-file-vs-directory-based" title="Permanent link">&para;</a></h4>
<p>They&rsquo;re the same, except:</p>
<ul>
<li>Directory-based extensions will be passed a <code>${EXTENSION_DIR}</code> environment variable.</li>
<li>That is useful if there are other files/assets that belong together with that extension. An example would be a template file, some configuration file, or other static asset that is directly related to the extension.</li>
<li>Using directory-based extensions and <code>${EXTENSION_DIR}</code> allows for easy moving and PR&rsquo;ing of user extensions.</li>
</ul>
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