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Show how to save conditional predicates in vars sections, which makes only_if cleaner.

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Michael DeHaan
2012-03-21 20:35:06 -04:00
parent 7136ef756d
commit ee2622ee7c
17 changed files with 30 additions and 24 deletions
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playbooks.html
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@@ -386,16 +386,19 @@ and allows usage of variables from anywhere in ansible, either denoted with <cit
<cite>{{ braces_syntax }}</cite> and then evaluates them with a Python expression. Don&#8217;t panic &#8211; it&#8217;s actually
pretty simple.:</p>
<div class="highlight-python"><pre>vars:
- favcolor: 'red'
is_favcolor_blue: "'$favcolor' == 'blue'"
is_centos: "'$facter_operatingsystem' == 'CentOS'"
tasks:
- name: "shutdown if my favorite color is blue"
action: command /sbin/shutdown -t now
only_if: "'$favcolor' == 'blue'"</pre>
only_if: '$is_favcolor_blue'</pre>
</div>
<p>Variables from tools like <cite>facter</cite> and <cite>ohai</cite> can also be used here, if installed. As a reminder,
<p>Variables from tools like <cite>facter</cite> and <cite>ohai</cite> can be used here, if installed. As a reminder,
these variables are prefixed, so it&#8217;s <cite>$facter_operatingsystem</cite>, not <cite>$operatingsystem</cite>. The only_if
expression is actually a tiny small bit of Python, so be sure to quote variables and make something
that evaluates to <cite>True</cite> or <cite>False</cite>.</p>
that evaluates to <cite>True</cite> or <cite>False</cite>. It is a good idea to use &#8216;vars_files&#8217; instead of &#8216;vars&#8217; to define
all of your conditional expressions in a way that makes them very easy to reuse between plays
and playbooks.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Handlers don&#8217;t support only_if because they don&#8217;t need to. If a handler is not notified,
@@ -618,7 +621,7 @@ Let&#8217;s run a playbook using a parallelism level of 10:</p>
<p class="pull-right"><a href="#">Back to top</a></p>
<p>
&copy; Copyright 2012 Michael DeHaan.<br/>
Last updated on Mar 20, 2012.<br/>
Last updated on Mar 21, 2012.<br/>
Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
</p>
</div>