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<h1 class="lined-header"><span>Updating Erlang.mk</span></h1>
<p>This chapter describes how to update the <em>erlang.mk</em> file in your repository.</p>
<h2 id="_initial_bootstrap">Initial bootstrap</h2>
<p>The first time you use Erlang.mk, it will bootstrap itself. It always uses the most recent version for this, so you don't have to update after creating your project.</p>
<h2 id="_updating">Updating</h2>
<p>Later on though, updating becomes a necessity. Erlang.mk developers and contributors relentlessly improve the project and add new features; it would be a waste not to benefit from this.</p>
<p>That's why updating Erlang.mk is so simple. All you need to do is to call <code>make erlang-mk</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>$ make erlang-mk
git clone https<font color="#990000">:</font>//github<font color="#990000">.</font>com/ninenines/erlang<font color="#990000">.</font>mk <font color="#990000">.</font>erlang<font color="#990000">.</font>mk<font color="#990000">.</font>build
Cloning into <font color="#FF0000">'.erlang.mk.build'</font><font color="#990000">...</font>
remote<font color="#990000">:</font> Counting objects<font color="#990000">:</font> <font color="#993399">4035</font><font color="#990000">,</font> <b><font color="#0000FF">done</font></b><font color="#990000">.</font>
remote<font color="#990000">:</font> Compressing objects<font color="#990000">:</font> <font color="#993399">100</font><font color="#990000">%</font> <font color="#990000">(</font><font color="#993399">12</font><font color="#990000">/</font><font color="#993399">12</font><font color="#990000">),</font> <b><font color="#0000FF">done</font></b><font color="#990000">.</font>
remote<font color="#990000">:</font> Total <font color="#993399">4035</font> <font color="#990000">(</font>delta <font color="#993399">8</font><font color="#990000">),</font> reused <font color="#993399">4</font> <font color="#990000">(</font>delta <font color="#993399">4</font><font color="#990000">),</font> pack-reused <font color="#993399">4019</font>
Receiving objects<font color="#990000">:</font> <font color="#993399">100</font><font color="#990000">%</font> <font color="#990000">(</font><font color="#993399">4035</font><font color="#990000">/</font><font color="#993399">4035</font><font color="#990000">),</font> <font color="#993399">1.10</font> MiB <font color="#990000">|</font> <font color="#993399">1000.00</font> KiB/s<font color="#990000">,</font> <b><font color="#0000FF">done</font></b><font color="#990000">.</font>
Resolving deltas<font color="#990000">:</font> <font color="#993399">100</font><font color="#990000">%</font> <font color="#990000">(</font><font color="#993399">2442</font><font color="#990000">/</font><font color="#993399">2442</font><font color="#990000">),</font> <b><font color="#0000FF">done</font></b><font color="#990000">.</font>
Checking connectivity<font color="#990000">...</font> <b><font color="#0000FF">done</font></b><font color="#990000">.</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">[</font> -f build<font color="#990000">.</font>config <font color="#990000">];</font> <b><font color="#0000FF">then</font></b> cp build<font color="#990000">.</font>config <font color="#990000">.</font>erlang<font color="#990000">.</font>mk<font color="#990000">.</font>build<font color="#990000">;</font> <b><font color="#0000FF">fi</font></b>
cd <font color="#990000">.</font>erlang<font color="#990000">.</font>mk<font color="#990000">.</font>build <font color="#990000">&&</font> make
make<font color="#990000">[</font><font color="#993399">1</font><font color="#990000">]:</font> Entering directory <font color="#FF0000">'/home/essen/tmp/emkg/hello_joe/.erlang.mk.build'</font>
awk <font color="#FF0000">'FNR==1 && NR!=1{print ""}1'</font> core/core<font color="#990000">.</font>mk index<font color="#990000">/*.</font>mk core/index<font color="#990000">.</font>mk core/deps<font color="#990000">.</font>mk plugins/protobuffs<font color="#990000">.</font>mk core/erlc<font color="#990000">.</font>mk core/docs<font color="#990000">.</font>mk core/test<font color="#990000">.</font>mk plugins/asciidoc<font color="#990000">.</font>mk plugins/bootstrap<font color="#990000">.</font>mk plugins/c_src<font color="#990000">.</font>mk plugins/ci<font color="#990000">.</font>mk plugins/ct<font color="#990000">.</font>mk plugins/dialyzer<font color="#990000">.</font>mk plugins/edoc<font color="#990000">.</font>mk plugins/elvis<font color="#990000">.</font>mk plugins/erlydtl<font color="#990000">.</font>mk plugins/escript<font color="#990000">.</font>mk plugins/eunit<font color="#990000">.</font>mk plugins/relx<font color="#990000">.</font>mk plugins/shell<font color="#990000">.</font>mk plugins/triq<font color="#990000">.</font>mk plugins/xref<font color="#990000">.</font>mk plugins/cover<font color="#990000">.</font>mk <font color="#990000">\</font>
<font color="#990000">|</font> sed <font color="#FF0000">'s/^ERLANG_MK_VERSION = .*/ERLANG_MK_VERSION = 1.2.0-642-gccd2b9f/'</font> <font color="#990000">></font> erlang<font color="#990000">.</font>mk
make<font color="#990000">[</font><font color="#993399">1</font><font color="#990000">]:</font> Leaving directory <font color="#FF0000">'/home/essen/tmp/emkg/hello_joe/.erlang.mk.build'</font>
cp <font color="#990000">.</font>erlang<font color="#990000">.</font>mk<font color="#990000">.</font>build/erlang<font color="#990000">.</font>mk <font color="#990000">.</font>/erlang<font color="#990000">.</font>mk
rm -rf <font color="#990000">.</font>erlang<font color="#990000">.</font>mk<font color="#990000">.</font>build</tt></pre>
</div></div>
<p>All that's left to do is to commit the file!</p>
<p>Yep, it's that easy.</p>
<h2 id="_customizing_the_build">Customizing the build</h2>
<p>Erlang.mk allows you to customize which components are to be included in the <em>erlang.mk</em> file. The <code>WITHOUT</code> variable allows you to remove components from the default Erlang.mk build. The <em>build.config</em> file lets you define exactly what goes in (including your own code!), and in what order.</p>
<p>The <code>WITHOUT</code> file contains the list of components to exclude from the build. For example, to exclude the package index and the EDoc plugin when bootstrapping your application:</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 -f erlang<font color="#990000">.</font>mk bootstrap <font color="#009900">WITHOUT</font><font color="#990000">=</font><font color="#FF0000">"index plugins/edoc"</font></tt></pre>
</div></div>
<p>The generated Erlang.mk will never include those components when you update it, until you change your mind and use the <code>WITHOUT</code> variable again when you 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 erlang-mk <font color="#009900">WITHOUT</font><font color="#990000">=</font>index</tt></pre>
</div></div>
<p>The <em>build.config</em> file is automatically used when you bootstrap Erlang.mk or when you update it with <code>make erlang-mk</code>.</p>
<p>The <em>build.config</em> file contains the list of all files that will be built into the resulting <em>erlang.mk</em> file. You can start from the <a href="https://github.com/ninenines/erlang.mk/blob/master/build.config">most recent version</a> and customize to your needs.</p>
<p>You can also name the file differently or put it in a separate folder by modifying the value for <code>ERLANG_MK_BUILD_CONFIG</code>. You can also tell Erlang.mk to use a different temporary directory by changing the <code>ERLANG_MK_BUILD_DIR</code> variable.</p>
<p>If you want to use a different repository or a specific commit for updating, you may use the variables <code>ERLANG_MK_REPO</code> and <code>ERLANG_MK_COMMIT</code>.</p>
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