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4.7.1
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="cdist-intro.html">1. cdist - usable configuration management</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-why.html">2. Why should I use cdist?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-os.html">3. Supported Operating Systems</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-install.html">4. How to install cdist</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-update.html">5. How to update cdist</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-support.html">6. Support</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-features.html">7. Features</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-quickstart.html">8. Quickstart</a></li>
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<li class="toctree-l1"><a class="reference internal" href="man1/cdist.html">9. cdist(1)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-bootstrap.html">10. Bootstrap</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-configuration.html">11. Configuration</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-manifest.html">12. Manifest</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-type.html">13. cdist type</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-types.html">14. cdist types</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">15. Explorer</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#description">15.1. Description</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#examples">15.2. Examples</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-messaging.html">16. Messaging</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-parallelization.html">17. Parallelization</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-inventory.html">18. Inventory</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-integration.html">19. cdist integration / using cdist as library</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-reference.html">20. Reference</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-best-practice.html">21. Best practice</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-stages.html">22. Execution stages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-remote-exec-copy.html">23. Remote exec and copy commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-hacker.html">24. Hacking</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-troubleshooting.html">25. Troubleshooting</a></li>
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</ul>
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<li><a href="index.html">Docs</a> »</li>
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<li>15. Explorer</li>
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<li class="wy-breadcrumbs-aside">
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<a href="_sources/cdist-explorer.rst.txt" rel="nofollow"> View page source</a>
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<div itemprop="articleBody">
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<div class="section" id="explorer">
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<h1>15. 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>15.1. 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"><div class="highlight"><pre><span></span>$__explorer/<explorer_name> (general and type explorer)
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</pre></div>
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</div>
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<p>or</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span>$__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>15.2. 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"><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"><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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