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<h1 class="lined-header"><span>Releases</span></h1>
<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>
<h2 id="_setup">Setup</h2>
<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 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><font color="#009900">RELX_CONFIG =</font> <font color="#009900">$(CURDIR)</font>/webchat.config</tt></pre>
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<p>It is also possible to have multiple <em>relx.config</em> files. For example you might have one for development and one for production. You can use conditionals to decide which one should be used:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>ifdef PROD
<font color="#009900">RELX_CONFIG =</font> <font color="#009900">$(CURDIR)</font>/relx.prod.config
<b><font color="#0000FF">else</font></b>
<font color="#009900">RELX_CONFIG =</font> <font color="#009900">$(CURDIR)</font>/relx.dev.config
endif</tt></pre>
</div></div>
<p>Relx does not need to be installed. Erlang.mk will download and build it automatically.</p>
<p>The Relx executable will be saved in the <em>$(RELX)</em> file. This location defaults to <em>$(CURDIR)/relx</em> and can be overriden.</p>
<!-- @todo You can use a custom location by ???-->
<h2 id="_configuration">Configuration</h2>
<p>You can specify additional Relx options using the <code>RELX_OPTS</code> variable. For example, to enable <code>dev_mode</code>:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><font color="#009900">RELX_OPTS =</font> -d <b><font color="#0000FF">true</font></b></tt></pre>
</div></div>
<p>While you can specify the output directory for the release in the Relx options directly, Erlang.mk provides a specific variable for it: <code>RELX_OUTPUT_DIR</code>. It defaults to the <em>_rel</em> directory. You can also override it:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><font color="#009900">RELX_OUTPUT_DIR =</font> /path/to/staging/directory</tt></pre>
</div></div>
<h2 id="_generating_the_release">Generating the release</h2>
<p>Now that you're all set, all you need to do is generate the release. As mentioned before, Erlang.mk will automatically generate it when it detects the <em>$(RELX_CONFIG)</em> file. This means the following command will also build the release:</p>
<div 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</tt></pre>
</div></div>
<p>If you need to generate the release, and only the release, the <code>rel</code> target can be used:</p>
<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>
<p>Erlang.mk always generates a tarball alongside the release, which can be directly uploaded to a server. The tarball is located at <code>$(RELX_OUTPUT_DIR)/<name>/<name>-<vsn>.tar.gz</code>.</p>
<h2 id="_running_the_release">Running the release</h2>
<p>Erlang.mk provides a convenience function for running the release with one simple command:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make run</tt></pre>
</div></div>
<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>
<h2 id="_upgrading_a_release">Upgrading a release</h2>
<p>Erlang.mk provides a <code>relup</code> target for generating release upgrades. Release upgrades allow updating the code and the state of a running release without restarting it.</p>
<p>Once your changes are done, you need to update the version of the application(s) that will be updated. You also need to update the version of the release.</p>
<p>For each application that needs to be updated, an <a href="http://erlang.org/doc/man/appup.html">appup file</a> must be written. Refer to the Erlang/OTP documentation for more details.</p>
<p>For the purpose of this section, assume the initial release version was <code>1</code>, and the new version is <code>2</code>. The name of the release will be <code>example</code>.</p>
<p>Once all this is done, you can build the tarball for the release upgrade:</p>
<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 relup</tt></pre>
</div></div>
<p>This will create an archive at the root directory of the release, <code>$RELX_OUTPUT_DIR/example/example-2.tar.gz</code>.</p>
<p>Move the archive to the correct location on the running node. From the release's root directory:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ mkdir releases<font color="#990000">/</font><font color="#993399">2</font><font color="#990000">/</font>
$ mv path/to/example-<font color="#993399">2</font><font color="#990000">.</font>tar<font color="#990000">.</font>gz releases<font color="#990000">/</font><font color="#993399">2</font><font color="#990000">/</font></tt></pre>
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<p>Finally, upgrade the release:</p>
<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>$ bin/example_release upgrade <font color="#FF0000">"2/example_release"</font></tt></pre>
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<p>Or on Windows:</p>
<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>$ bin/example_release<font color="#990000">.</font>cmd upgrade <font color="#FF0000">"2/example_release"</font></tt></pre>
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<p>Your release was upgraded!</p>
<h2 id="_getting_relx_semver_value">Getting Relx semver value</h2>
<p>There is a <strong>workaround</strong> to get the semver value which is generated by Relx based on VCS history.</p>
<p>Create a file <em>config/version</em> with only one line inside:</p>
<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>{{ <font color="#FF6600">release_version</font> }}</tt></pre>
</div></div>
<p>Add/Update the <code>overlay</code> section of your <code>relx.config</code>:</p>
<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>{<font color="#FF6600">overlay</font>, [
{<font color="#FF6600">template</font>, <font color="#FF0000">"config/version"</font>, <font color="#FF0000">"version"</font>}
]}<font color="#990000">.</font></tt></pre>
</div></div>
<p>When you run <code>make rel</code> it creates the file <em>$(RELX_OUTPUT_DIR)/example/version</em> which contains the version value generated by Relx.</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ cat _rel/app/release
<font color="#993399">1.0</font><font color="#990000">.</font><font color="#993399">0</font><font color="#990000">+</font>build<font color="#990000">.</font><font color="#993399">11</font><font color="#990000">.</font>ref5612aa0</tt></pre>
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<p>In your <code>Makefile</code> you can use this simple snippet to get the version, but please keep in mind that this should depend on the <code>rel</code> target:</p>
<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><font color="#009900">$(</font>shell cat <font color="#009900">$(RELX_OUTPUT_DIR)/$(RELX_REL_NAME)/version)</font></tt></pre>
</div></div>
<p>For example:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>include erlang.mk
<font color="#009900">APP_VERSION =</font> <font color="#009900">$(</font>shell cat <font color="#009900">$(RELX_OUTPUT_DIR)/$(RELX_REL_NAME)/version)</font>
<font color="#990000">myrecipe:</font> all
echo APP_VERSION <font color="#990000">=</font> <font color="#009900">$(APP_VERSION)</font></tt></pre>
</div></div>
<p>Would output:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make myrecipe
<font color="#990000">...</font>
<font color="#990000">===></font> Starting relx build process <font color="#990000">...</font>
<font color="#990000">===></font> Resolving OTP Applications from directories<font color="#990000">:</font>
/home/username/example/apps
/home/username/example/deps
/usr/lib/erlang/lib
/home/username/example<font color="#990000">/</font>_rel
<font color="#990000">===></font> Resolved example-<font color="#993399">0.3</font><font color="#990000">.</font><font color="#993399">10</font><font color="#990000">+</font>build<font color="#990000">.</font><font color="#993399">11</font><font color="#990000">.</font>ref5612aa0
<font color="#990000">===></font> Including Erts from /usr/lib/erlang
<font color="#990000">===></font> release successfully created<font color="#990000">!</font>
<font color="#990000">===></font> tarball /home/username/example<font color="#990000">/</font>_rel/example/example-<font color="#993399">0.3</font><font color="#990000">.</font><font color="#993399">10</font><font color="#990000">+</font>build<font color="#990000">.</font><font color="#993399">11</font><font color="#990000">.</font>ref5612aa0<font color="#990000">.</font>tar<font color="#990000">.</font>gz successfully created<font color="#990000">!</font>
echo APP_VERSION <font color="#990000">=</font> <font color="#993399">0.3</font><font color="#990000">.</font><font color="#993399">10</font><font color="#990000">+</font>build<font color="#990000">.</font><font color="#993399">11</font><font color="#990000">.</font>ref5612aa0
APP_VERSION <font color="#990000">=</font> <font color="#993399">0.3</font><font color="#990000">.</font><font color="#993399">10</font><font color="#990000">+</font>build<font color="#990000">.</font><font color="#993399">11</font><font color="#990000">.</font>ref5612aa0</tt></pre>
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