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<title>Nine Nines: Releases</title>
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<h1 class="lined-header"><span>Releases</span></h1>
<div class="paragraph"><p>Erlang.mk relies on <em>Relx</em> for generating releases. This
chapter covers the Erlang.mk-specific bits. Consult the
<a href="https://erlware.github.io/relx/">Relx website</a> for more information.</p></div>
<div class="sect1">
<h2 id="_setup">Setup</h2>
<div class="sectionbody">
<div class="paragraph"><p>Erlang.mk will create a release if it detects a Relx configuration
file in the <em>$(RELX_CONFIG)</em> location. This defaults to
<em>$(CURDIR)/relx.config</em>. You can override it by defining
the variable before including Erlang.mk:</p></div>
<div class="listingblock">
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<pre><tt><span style="color: #009900">RELX_CONFIG =</span> <span style="color: #009900">$(CURDIR)</span>/webchat.config</tt></pre></div></div>
<div class="paragraph"><p>Relx does not need to be installed. Erlang.mk will download
and build it automatically.</p></div>
<div class="paragraph"><p>The Relx executable will be saved in the <em>$(RELX)</em> file. This
location defaults to <em>$(CURDIR)/relx</em> and can be overriden.</p></div>
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<div class="sect1">
<h2 id="_configuration">Configuration</h2>
<div class="sectionbody">
<div class="paragraph"><p>You can specify additional Relx options using the <code>RELX_OPTS</code>
variable. For example, to enable <code>dev_mode</code>:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
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<pre><tt><span style="color: #009900">RELX_OPTS =</span> -d <span style="font-weight: bold"><span style="color: #0000FF">true</span></span></tt></pre></div></div>
<div class="paragraph"><p>While you can specify the output directory for the release
in the Relx options directly, Erlang.mk provides a specific
variable for it: <code>RELX_OUTPUT_DIR</code>. It defaults to the <em>_rel</em>
directory. You can also override it:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #009900">RELX_OUTPUT_DIR =</span> /path/to/staging/directory</tt></pre></div></div>
</div>
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<div class="sect1">
<h2 id="_generating_the_release">Generating the release</h2>
<div class="sectionbody">
<div class="paragraph"><p>Now that you’re all set, all you need to do is generate the
release. As mentioned before, Erlang.mk will automatically
generate it when it detects the <em>$(RELX_CONFIG)</em> file. This
means the following command will also build the release:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
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http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make</tt></pre></div></div>
<div class="paragraph"><p>If you need to generate the release, and only the release,
the <code>rel</code> target can be used:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make rel</tt></pre></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_running_the_release">Running the release</h2>
<div class="sectionbody">
<div class="paragraph"><p>Erlang.mk provides a convenience function for running the
release with one simple command:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make run</tt></pre></div></div>
<div class="paragraph"><p>This command will also build the project and generate the
release if they weren’t already. It starts the release in
<em>console mode</em>, meaning you will also have a shell ready to
use to check things as needed.</p></div>
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