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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>cdist-explorer(7)</title><link rel="stylesheet" type="text/css" href="docbook-xsl.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.77.1" /></head><body><div xml:lang="en" class="article" lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="idp186368"></a>cdist-explorer(7)</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Nico</span> <span class="surname">Schottelius</span></h3><code class="email"><<a class="email" href="mailto:nico-cdist--@--schottelius.org">nico-cdist--@--schottelius.org</a>></code></div></div></div><hr /></div><div class="toc"><p><strong>Table of Contents</strong></p><dl><dt><span class="section"><a href="#_name">1. NAME</a></span></dt><dt><span class="section"><a href="#_description">2. DESCRIPTION</a></span></dt><dt><span class="section"><a href="#_examples">3. EXAMPLES</a></span></dt><dt><span class="section"><a href="#_see_also">4. SEE ALSO</a></span></dt><dt><span class="section"><a href="#_copying">5. COPYING</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_name"></a>1. NAME</h2></div></div></div><p>cdist-explorer - Explore the target systems</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_description"></a>2. DESCRIPTION</h2></div></div></div><p>Explorer are small shell scripts, which will be executed on the target
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host. The aim of the 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><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><p>Explorers can reuse other explorers on the target system by calling
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$<span class="emphasis"><em>explorer/<explorer_name> (general and type explorer) or
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$</em></span>type_explorer/<explorer name> (type explorer).</p><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><p>You can also use stderr for debugging purposes while developing a new
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explorer.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_examples"></a>3. EXAMPLES</h2></div></div></div><p>A very simple explorer may look like this:</p><pre class="screen">hostname</pre><p>Which is in practise the <span class="strong"><strong><span class="strong"><strong>hostname</strong></span></strong></span> explorer.</p><p>A type explorer, which could check for the status of a package may look like this:</p><pre class="screen">if [ -f "$__object/parameter/name" ]; then
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name="$(cat "$__object/parameter/name")"
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else
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name="$__object_id"
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fi
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# Except dpkg failing, if package is not known / installed
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dpkg -s "$name" 2>/dev/null || exit 0</pre></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_see_also"></a>4. SEE ALSO</h2></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
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cdist(1)
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</li><li class="listitem">
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cdist-reference(7)
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</li><li class="listitem">
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cdist-stages(7)
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</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_copying"></a>5. COPYING</h2></div></div></div><p>Copyright (C) 2010-2012 Nico Schottelius. Free use of this software is
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granted under the terms of the GNU General Public License version 3 (GPLv3).</p></div></div></body></html>
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