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<li class="toctree-l1"><a class="reference internal" href="cdist-why.html">1. Why should I use cdist?</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">17. Explorer</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#description">17.1. Description</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#examples">17.2. Examples</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-messaging.html">18. Messaging</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-parallelization.html">19. Parallelization</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-inventory.html">20. Inventory</a></li>
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<li><span class="section-number">17. </span>Explorer</li>
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<div class="section" id="explorer">
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<h1><span class="section-number">17. </span>Explorer<a class="headerlink" href="#explorer" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="description">
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<h2><span class="section-number">17.1. </span>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Explorers are small shell scripts, which will be executed on the target
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host. The aim of each explorer is to give hints to types on how to act on the
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target system. An explorer outputs the result to stdout, which is usually
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a one liner, but may be empty or multi line especially in the case of
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type explorers.</p>
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<p>There are general explorers, which are run in an early stage, and
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type explorers. Both work almost exactly the same way, with the difference
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that the values of the general explorers are stored in a general location and
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the type specific below the object.</p>
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<p>Explorers can reuse other explorers on the target system by calling</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$__explorer/<explorer_name> (general and type explorer)
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</pre></div>
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</div>
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<p>or</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$__type_explorer/<explorer name> (type explorer).
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</pre></div>
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</div>
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<p>In case of significant errors, the explorer may exit non-zero and return an
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error message on stderr, which will cause cdist to abort.</p>
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<p>You can also use stderr for debugging purposes while developing a new
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explorer.</p>
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</div>
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<div class="section" id="examples">
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<h2><span class="section-number">17.2. </span>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<p>A very simple explorer may look like this:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">hostname</span>
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</pre></div>
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</div>
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<p>Which is in practise the <strong>hostname</strong> explorer.</p>
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<p>A type explorer, which could check for the status of a package may look like this:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="o">[</span> -f <span class="s2">"</span><span class="nv">$__object</span><span class="s2">/parameter/name"</span> <span class="o">]</span><span class="p">;</span> <span class="k">then</span>
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<span class="nv">name</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>cat <span class="s2">"</span><span class="nv">$__object</span><span class="s2">/parameter/name"</span><span class="k">)</span><span class="s2">"</span>
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<span class="k">else</span>
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<span class="nv">name</span><span class="o">=</span><span class="s2">"</span><span class="nv">$__object_id</span><span class="s2">"</span>
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<span class="k">fi</span>
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<span class="c1"># Expect dpkg failing, if package is not known / installed</span>
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dpkg -s <span class="s2">"</span><span class="nv">$name</span><span class="s2">"</span> <span class="m">2</span>>/dev/null <span class="o">||</span> <span class="nb">exit</span> <span class="m">0</span>
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</pre></div>
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