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  <div class="section" id="advanced-topics">
<h1>Advanced Topics<a class="headerlink" href="#advanced-topics" title="Permalink to this headline"></a></h1>
<div class="section" id="bootloader-customisation">
<h2>Bootloader Customisation<a class="headerlink" href="#bootloader-customisation" title="Permalink to this headline"></a></h2>
<p>By default, both ISOLINUX (for BIOS boot) and GRUB 2 (for EFI boot) are
installed into the images. A <code class="docutils literal"><span class="pre">loopback.cfg</span></code> file is also installed to allow
for the image to be booted while still an ISO image in a filesystem.</p>
<p>You can pass <code class="docutils literal"><span class="pre">--no-isolinux</span></code> to prevent the installation of ISOLINUX to the
image if you do not want ISOLINUX.</p>
<p>You can pass <code class="docutils literal"><span class="pre">--no-grub</span></code> to prevent the installation of GRUB to the image.</p>
<p>If you do not want GRUB installed but you would still like the <code class="docutils literal"><span class="pre">loopback.cfg</span></code>
file to be installed, you can pass <code class="docutils literal"><span class="pre">--grub-loopback-only</span></code>.</p>
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<div class="section" id="using-an-alternative-build-directory">
<h2>Using an Alternative Build Directory<a class="headerlink" href="#using-an-alternative-build-directory" title="Permalink to this headline"></a></h2>
<p>Temporary directories are created using the Python standard library functions
for doing so. On Debian systems, this typically means that the directories are
created in <code class="docutils literal"><span class="pre">/tmp</span></code>. If this is problematic for you, perhaps due to filesystem
permissions, you can change the path that Python will use to create directories
in by using the <code class="docutils literal"><span class="pre">TMP</span></code> environment variable, for example:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">TMP</span><span class="o">=/</span><span class="n">other</span><span class="o">/</span><span class="n">path</span> <span class="n">lwr</span> <span class="o">--</span><span class="n">blah</span> <span class="o">--</span><span class="n">blah</span>
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<li><a class="reference internal" href="#bootloader-customisation">Bootloader Customisation</a></li>
<li><a class="reference internal" href="#using-an-alternative-build-directory">Using an Alternative Build Directory</a></li>
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