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28.2
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< li class = "toctree-l1 current" > < a class = "current reference internal" href = "#" > Introduction to Lorax< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "#before-lorax" > Before Lorax< / a > < / li >
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< h1 > Introduction to Lorax< a class = "headerlink" href = "#introduction-to-lorax" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > I am the Lorax. I speak for the trees [and images].< / p >
< p > Lorax is used to build the Anaconda Installer boot.iso, it consists of a
library, pylorax, a set of templates, and the lorax script. Its operation
is driven by a customized set of Mako templates that lists the packages
to be installed, steps to execute to remove unneeded files, and creation
of the iso for all of the supported architectures.< / p >
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< h1 > Before Lorax< a class = "headerlink" href = "#before-lorax" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > Tree building tools such as pungi and revisor rely on ‘ buildinstall’ in
anaconda/scripts/ to produce the boot images and other such control files
in the final tree. The existing buildinstall scripts written in a mix of
bash and Python are unmaintainable. Lorax is an attempt to replace them
with something more flexible.< / p >
< p > EXISTING WORKFLOW:< / p >
< p > pungi and other tools call scripts/buildinstall, which in turn call other
scripts to do the image building and data generation. Here’ s how it
currently looks:< / p >
< blockquote >
< div > < dl class = "docutils" >
< dt > -> buildinstall< / dt >
< dd > < ul class = "first simple" >
< li > process command line options< / li >
< li > write temporary yum.conf to point to correct repo< / li >
< li > find anaconda release RPM< / li >
< li > unpack RPM, pull in those versions of upd-instroot, mk-images,
maketreeinfo.py, makestamp.py, and buildinstall< / li >
< / ul >
< p > -> call upd-instroot< / p >
< p > -> call maketreeinfo.py< / p >
< p > -> call mk-images (which figures out which mk-images.ARCH to call)< / p >
< p > -> call makestamp.py< / p >
< ul class = "last simple" >
< li > clean up< / li >
< / ul >
< / dd >
< / dl >
< / div > < / blockquote >
< p > PROBLEMS:< / p >
< p > The existing workflow presents some problems with maintaining the scripts.
First, almost all knowledge of what goes in to the stage 1 and stage 2
images lives in upd-instroot. The mk-images* scripts copy things from the
root created by upd-instroot in order to build the stage 1 image, though
it’ s not completely clear from reading the scripts.< / p >
< p > NEW IDEAS:< / p >
< p > Create a new central driver with all information living in Python modules.
Configuration files will provide the knowledge previously contained in the
upd-instroot and mk-images* scripts.< / p >
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© Copyright 2015, Red Hat, Inc..
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