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documentation: Rename of poky-ref-manual folder to ref-manual.

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Changing the folder that holds the YP Reference Manual to be
"ref-manual".  This will help with confustion over the manual's
intended purpose.

(From yocto-docs rev: 1106442964b5080cb0b6b3bd3af32e9407c0f7c1)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2012-12-11 12:07:58 -06:00
committed by Richard Purdie
parent af19d889ef
commit ed0a240e16
214 changed files with 26016 additions and 0 deletions
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documentation/ref-manual/eclipse/html/poky-ref-manual/ref-classes-update-alternatives.html Normal file
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>7.3.<2E>Alternatives - update-alternatives.bbclass</title>
<link rel="stylesheet" type="text/css" href="../book.css">
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<link rel="home" href="index.html" title="The Yocto Project Reference Manual">
<link rel="up" href="ref-classes.html" title="Chapter<65>7.<2E>Classes">
<link rel="prev" href="ref-classes-autotools.html" title="7.2.<2E>Autotooled Packages - autotools.bbclass">
<link rel="next" href="ref-classes-update-rc.d.html" title="7.4.<2E>Initscripts - update-rc.d.bbclass">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="7.3.<2E>Alternatives - update-alternatives.bbclass">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="ref-classes-update-alternatives"></a>7.3.<2E>Alternatives - <code class="filename">update-alternatives.bbclass</code>
</h2></div></div></div>
<p>
Several programs can fulfill the same or similar function and be installed with the same name.
For example, the <code class="filename">ar</code> command is available from the
<code class="filename">busybox</code>, <code class="filename">binutils</code> and
<code class="filename">elfutils</code> packages.
The <code class="filename">update-alternatives.bbclass</code> class handles renaming the
binaries so that multiple packages can be installed without conflicts.
The <code class="filename">ar</code> command still works regardless of which packages are installed
or subsequently removed.
The class renames the conflicting binary in each package and symlinks the highest
priority binary during installation or removal of packages.
</p>
<p>
Four variables control this class:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p><code class="filename">ALTERNATIVE_NAME</code> &#8208; The name of the
binary that is replaced (<code class="filename">ar</code> in this example).</p></li>
<li class="listitem"><p><code class="filename">ALTERNATIVE_LINK</code> &#8208; The path to
the resulting binary (<code class="filename">/bin/ar</code> in this example).</p></li>
<li class="listitem"><p><code class="filename">ALTERNATIVE_PATH</code> &#8208; The path to the
real binary (<code class="filename">/usr/bin/ar.binutils</code> in this example).</p></li>
<li class="listitem"><p><code class="filename">ALTERNATIVE_PRIORITY</code> &#8208; The priority of
the binary.
The version with the most features should have the highest priority.</p></li>
</ul></div>
<p>
</p>
<p>
Currently, the OpenEmbedded build system supports only one binary per package.
</p>
</div></body>
</html>