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<title>s6-frontend: the s6-frontend-config-preprocess program</title>
<meta name="Description" content="s6-frontend: the s6-frontend-config-preprocess program" />
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<p>
<a href="index.html">s6-frontend</a><br />
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
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<h1> The s6-frontend-config-preprocess program </h1>
<p>
<tt>s6-frontend-config-preprocess</tt> reads a s6-frontend configuration
file and executes all its inclusion directives, also preprocessing the
included files. It streams the result to stdout, which is a complete
configuration file without inclusions.
</p>
<h2> Interface </h2>
<pre>
s6-frontend-config-preprocess <em>file</em>
</pre>
<p>
<tt>s6-frontend-config-preprocess</tt> reads <em>file</em> and prints it
to stdout. It removes lines starting with <tt>!!</tt>.
</p>
<p>
When it finds a <tt>!include</tt> or <tt>!includeonce</tt> directive
in <em>file</em>, it replaces it with the contents of the included
file - recursively preprocessed.
</p>
<p>
When it finds a <tt>!includedir</tt> or <tt>!includedironce</tt>
directive in <em>file</em>, it replaces it with the recursively
preprocessed contents of every file present in the included
directory. The files are sorted alphabetically according to the
C locale.
</p>
<p>
<tt>!includeonce</tt> and <tt>!includedironce</tt> only print
a file (resp. a directory) the first time they encounter it, and
silently ignore subsequent instances. <tt>!include</tt> and
<tt>!includedir</tt> directives will happily include the same
files several times.
</p>
<p>
To avoid loops, a nesting limit exists. <tt>s6-frontend-config-preprocess</tt>
will fail if there are too many nested inclusions.
</p>
<h2> Exit codes </h2>
<ul>
<li> 0: success </li>
<li> 1: syntax error in a configuration file </li>
<li> 2: other error in a configuration file </li>
<li> 3: too many nested inclusions </li>
<li> 100: usage error </li>
<li> 111: system call failed </li>
</ul>
<h2> Notes </h2>
<ul>
<li> <tt>s6-frontend-config-preprocess</tt> is not meant to be
called directly by the user. It is normally invoked by
<a href="s6-frontend-config-parse.html">s6-frontend-config-parse</a>.
However, the binary is made available for debugging purposes. </li>
</ul>
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