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36.3
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Introduction to Lorax</a></li>
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<section id="introduction-to-lorax">
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<h1>Introduction to Lorax<a class="headerlink" href="#introduction-to-lorax" title="Permalink to this headline">¶</a></h1>
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<p>I am the Lorax. I speak for the trees [and images].</p>
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<p>Lorax is used to build the Anaconda Installer boot.iso, it consists of a
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library, pylorax, a set of templates, and the lorax script. Its operation
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is driven by a customized set of Mako templates that lists the packages
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to be installed, steps to execute to remove unneeded files, and creation
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of the iso for all of the supported architectures.</p>
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</section>
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<section id="before-lorax">
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<h1>Before Lorax<a class="headerlink" href="#before-lorax" title="Permalink to this headline">¶</a></h1>
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<p>Tree building tools such as pungi and revisor rely on 'buildinstall' in
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anaconda/scripts/ to produce the boot images and other such control files
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in the final tree. The existing buildinstall scripts written in a mix of
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bash and Python are unmaintainable. Lorax is an attempt to replace them
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with something more flexible.</p>
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<p>EXISTING WORKFLOW:</p>
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<p>pungi and other tools call scripts/buildinstall, which in turn call other
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scripts to do the image building and data generation. Here's how it
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currently looks:</p>
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<blockquote>
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<div><dl>
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<dt>-> buildinstall</dt><dd><ul class="simple">
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<li><p>process command line options</p></li>
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<li><p>write temporary yum.conf to point to correct repo</p></li>
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<li><p>find anaconda release RPM</p></li>
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<li><p>unpack RPM, pull in those versions of upd-instroot, mk-images,
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maketreeinfo.py, makestamp.py, and buildinstall</p></li>
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</ul>
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<p>-> call upd-instroot</p>
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<p>-> call maketreeinfo.py</p>
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<p>-> call mk-images (which figures out which mk-images.ARCH to call)</p>
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<p>-> call makestamp.py</p>
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<ul class="simple">
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<li><p>clean up</p></li>
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</ul>
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</dd>
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</dl>
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</div></blockquote>
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<p>PROBLEMS:</p>
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<p>The existing workflow presents some problems with maintaining the scripts.
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First, almost all knowledge of what goes in to the stage 1 and stage 2
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images lives in upd-instroot. The mk-images* scripts copy things from the
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root created by upd-instroot in order to build the stage 1 image, though
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it's not completely clear from reading the scripts.</p>
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<p>NEW IDEAS:</p>
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<p>Create a new central driver with all information living in Python modules.
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Configuration files will provide the knowledge previously contained in the
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upd-instroot and mk-images* scripts.</p>
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</section>
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