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<h1 class="lined-header"><span>Updating Erlang.mk</span></h1>
<div class="paragraph"><p>This chapter describes how to update the <em>erlang.mk</em> file
in your repository.</p></div>
<div class="sect1">
<h2 id="_initial_bootstrap">Initial bootstrap</h2>
<div class="sectionbody">
<div class="paragraph"><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></div>
</div>
</div>
<div class="sect1">
<h2 id="_updating">Updating</h2>
<div class="sectionbody">
<div class="paragraph"><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></div>
<div class="paragraph"><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>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make erlang-mk
git clone https<span style="color: #990000">:</span>//github<span style="color: #990000">.</span>com/ninenines/erlang<span style="color: #990000">.</span>mk <span style="color: #990000">.</span>erlang<span style="color: #990000">.</span>mk<span style="color: #990000">.</span>build
Cloning into <span style="color: #FF0000">'.erlang.mk.build'</span><span style="color: #990000">...</span>
remote<span style="color: #990000">:</span> Counting objects<span style="color: #990000">:</span> <span style="color: #993399">4035</span><span style="color: #990000">,</span> <span style="font-weight: bold"><span style="color: #0000FF">done</span></span><span style="color: #990000">.</span>
remote<span style="color: #990000">:</span> Compressing objects<span style="color: #990000">:</span> <span style="color: #993399">100</span><span style="color: #990000">%</span> <span style="color: #990000">(</span><span style="color: #993399">12</span><span style="color: #990000">/</span><span style="color: #993399">12</span><span style="color: #990000">),</span> <span style="font-weight: bold"><span style="color: #0000FF">done</span></span><span style="color: #990000">.</span>
remote<span style="color: #990000">:</span> Total <span style="color: #993399">4035</span> <span style="color: #990000">(</span>delta <span style="color: #993399">8</span><span style="color: #990000">),</span> reused <span style="color: #993399">4</span> <span style="color: #990000">(</span>delta <span style="color: #993399">4</span><span style="color: #990000">),</span> pack-reused <span style="color: #993399">4019</span>
Receiving objects<span style="color: #990000">:</span> <span style="color: #993399">100</span><span style="color: #990000">%</span> <span style="color: #990000">(</span><span style="color: #993399">4035</span><span style="color: #990000">/</span><span style="color: #993399">4035</span><span style="color: #990000">),</span> <span style="color: #993399">1.10</span> MiB <span style="color: #990000">|</span> <span style="color: #993399">1000.00</span> KiB/s<span style="color: #990000">,</span> <span style="font-weight: bold"><span style="color: #0000FF">done</span></span><span style="color: #990000">.</span>
Resolving deltas<span style="color: #990000">:</span> <span style="color: #993399">100</span><span style="color: #990000">%</span> <span style="color: #990000">(</span><span style="color: #993399">2442</span><span style="color: #990000">/</span><span style="color: #993399">2442</span><span style="color: #990000">),</span> <span style="font-weight: bold"><span style="color: #0000FF">done</span></span><span style="color: #990000">.</span>
Checking connectivity<span style="color: #990000">...</span> <span style="font-weight: bold"><span style="color: #0000FF">done</span></span><span style="color: #990000">.</span>
<span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">[</span> -f build<span style="color: #990000">.</span>config <span style="color: #990000">];</span> <span style="font-weight: bold"><span style="color: #0000FF">then</span></span> cp build<span style="color: #990000">.</span>config <span style="color: #990000">.</span>erlang<span style="color: #990000">.</span>mk<span style="color: #990000">.</span>build<span style="color: #990000">;</span> <span style="font-weight: bold"><span style="color: #0000FF">fi</span></span>
cd <span style="color: #990000">.</span>erlang<span style="color: #990000">.</span>mk<span style="color: #990000">.</span>build <span style="color: #990000">&&</span> make
make<span style="color: #990000">[</span><span style="color: #993399">1</span><span style="color: #990000">]:</span> Entering directory <span style="color: #FF0000">'/home/essen/tmp/emkg/hello_joe/.erlang.mk.build'</span>
awk <span style="color: #FF0000">'FNR==1 && NR!=1{print ""}1'</span> core/core<span style="color: #990000">.</span>mk index<span style="color: #990000">/*.</span>mk core/index<span style="color: #990000">.</span>mk core/deps<span style="color: #990000">.</span>mk plugins/protobuffs<span style="color: #990000">.</span>mk core/erlc<span style="color: #990000">.</span>mk core/docs<span style="color: #990000">.</span>mk core/test<span style="color: #990000">.</span>mk plugins/asciidoc<span style="color: #990000">.</span>mk plugins/bootstrap<span style="color: #990000">.</span>mk plugins/c_src<span style="color: #990000">.</span>mk plugins/ci<span style="color: #990000">.</span>mk plugins/ct<span style="color: #990000">.</span>mk plugins/dialyzer<span style="color: #990000">.</span>mk plugins/edoc<span style="color: #990000">.</span>mk plugins/elvis<span style="color: #990000">.</span>mk plugins/erlydtl<span style="color: #990000">.</span>mk plugins/escript<span style="color: #990000">.</span>mk plugins/eunit<span style="color: #990000">.</span>mk plugins/relx<span style="color: #990000">.</span>mk plugins/shell<span style="color: #990000">.</span>mk plugins/triq<span style="color: #990000">.</span>mk plugins/xref<span style="color: #990000">.</span>mk plugins/cover<span style="color: #990000">.</span>mk <span style="color: #990000">\</span>
<span style="color: #990000">|</span> sed <span style="color: #FF0000">'s/^ERLANG_MK_VERSION = .*/ERLANG_MK_VERSION = 1.2.0-642-gccd2b9f/'</span> <span style="color: #990000">></span> erlang<span style="color: #990000">.</span>mk
make<span style="color: #990000">[</span><span style="color: #993399">1</span><span style="color: #990000">]:</span> Leaving directory <span style="color: #FF0000">'/home/essen/tmp/emkg/hello_joe/.erlang.mk.build'</span>
cp <span style="color: #990000">.</span>erlang<span style="color: #990000">.</span>mk<span style="color: #990000">.</span>build/erlang<span style="color: #990000">.</span>mk <span style="color: #990000">.</span>/erlang<span style="color: #990000">.</span>mk
rm -rf <span style="color: #990000">.</span>erlang<span style="color: #990000">.</span>mk<span style="color: #990000">.</span>build</tt></pre></div></div>
<div class="paragraph"><p>All that’s left to do is to commit the file!</p></div>
<div class="paragraph"><p>Yep, it’s that easy.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_customizing_the_build">Customizing the build</h2>
<div class="sectionbody">
<div class="paragraph"><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></div>
<div class="paragraph"><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>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make -f erlang<span style="color: #990000">.</span>mk bootstrap <span style="color: #009900">WITHOUT</span><span style="color: #990000">=</span><span style="color: #FF0000">"index plugins/edoc"</span></tt></pre></div></div>
<div class="paragraph"><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>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>$ make erlang-mk <span style="color: #009900">WITHOUT</span><span style="color: #990000">=</span>index</tt></pre></div></div>
<div class="paragraph"><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></div>
<div class="paragraph"><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></div>
<div class="paragraph"><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></div>
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