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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/sasl-2.2.1.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>System Application Support Libraries (SASL)</strong><br><strong>Reference Manual</strong><br><small>Version 2.2.1</small></p>
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<!-- refpage --><center><h1>rel</h1></center>
<h3>FILE</h3>
<div class="REFBODY">rel</div>
<h3>FILE SUMMARY</h3>
<div class="REFBODY">Release resource file</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>The <strong>release resource file</strong> specifies which applications are
are included in a release (system) based on Erlang/OTP.</p>
<p>This file is used by the functions in <span class="code">systools</span> when generating
start scripts (<span class="code">.script</span>, <span class="code">.boot</span>) and release upgrade
files (<span class="code">relup</span>).</p>
</p></div>
<h3><a name="id73872">FILE SYNTAX</a></h3>
<div class="REFBODY">
<p>The release resource file should be called <span class="code">Name.rel</span>.</p>
<p>The <span class="code">.rel</span> file contains one single Erlang term, which is
called a <strong>release specification</strong>. The file has the
following syntax:</p>
<div class="example"><pre>
{release, {RelName,Vsn}, {erts, EVsn},
[{Application, AppVsn} |
{Application, AppVsn, Type} |
{Application, AppVsn, IncApps} |
{Application, AppVsn, Type, IncApps}]}.
</pre></div>
<ul>
<li>
<p><span class="code">RelName = string()</span> is the name of the release.</p>
</li>
<li>
<p><span class="code">Vsn = string()</span> is the version of the release.</p>
</li>
<li>
<p><span class="code">EVsn = string()</span> is the version of ERTS the release is
intended for.</p>
</li>
<li>
<p><span class="code">Application = atom()</span> is the name of an application
included in the release.</p>
</li>
<li>
<p><span class="code">AppVsn = string()</span> is the version of an application
included in the release.</p>
</li>
<li>
<p><span class="code">Type = permanent | transient | temporary | load | none</span>
is the start type of an application included in the release.</p>
<p>If <span class="code">Type = permanent | transient | temporary</span>,
the application will be loaded and started in the corresponding
way, see <span class="code">application(3)</span>. If <span class="code">Type = load</span>,
the application will only be loaded. If <span class="code">Type = none</span>,
the application will be neither loaded nor started, although
the code for its modules will be loaded.
Defaults to <span class="code">permanent</span></p>
</li>
<li>
<p><span class="code">IncApps = [atom()]</span> is a list of applications that are
included by an application included in the release.</p>
<p>The list must be a subset of the included applications
specified in the application resource file
(<span class="code">Application.app</span>) and overrides this value. Defaults
to the same value as in the application resource file.</p>
</li>
</ul>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>The list of applications must contain the <span class="code">kernel</span> and
<span class="code">stdlib</span> applications.</p>
</p></div>
</div>
</div>
<h3><a name="id74031">SEE ALSO</a></h3>
<div class="REFBODY">
<p>application(3), relup(4), systools(3)</p>
</div>
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