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1<html>
2<head>
3<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
4<title>7.3. Alternatives - update-alternatives.bbclass</title>
5<link rel="stylesheet" type="text/css" href="../book.css">
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7<link rel="home" href="index.html" title="The Yocto Project Reference Manual">
8<link rel="up" href="ref-classes.html" title="Chapter 7. Classes">
9<link rel="prev" href="ref-classes-autotools.html" title="7.2. Autotooled Packages - autotools.bbclass">
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12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="7.3. Alternatives - update-alternatives.bbclass">
13<div class="titlepage"><div><div><h2 class="title" style="clear: both">
14<a name="ref-classes-update-alternatives"></a>7.3. Alternatives - <code class="filename">update-alternatives.bbclass</code>
15</h2></div></div></div>
16<p>
17 Several programs can fulfill the same or similar function and be installed with the same name.
18 For example, the <code class="filename">ar</code> command is available from the
19 <code class="filename">busybox</code>, <code class="filename">binutils</code> and
20 <code class="filename">elfutils</code> packages.
21 The <code class="filename">update-alternatives.bbclass</code> class handles renaming the
22 binaries so that multiple packages can be installed without conflicts.
23 The <code class="filename">ar</code> command still works regardless of which packages are installed
24 or subsequently removed.
25 The class renames the conflicting binary in each package and symlinks the highest
26 priority binary during installation or removal of packages.
27 </p>
28<p>
29 Four variables control this class:
30 </p>
31<div class="itemizedlist"><ul class="itemizedlist" type="disc">
32<li class="listitem"><p><code class="filename">ALTERNATIVE_NAME</code> &#8208; The name of the
33 binary that is replaced (<code class="filename">ar</code> in this example).</p></li>
34<li class="listitem"><p><code class="filename">ALTERNATIVE_LINK</code> &#8208; The path to
35 the resulting binary (<code class="filename">/bin/ar</code> in this example).</p></li>
36<li class="listitem"><p><code class="filename">ALTERNATIVE_PATH</code> &#8208; The path to the
37 real binary (<code class="filename">/usr/bin/ar.binutils</code> in this example).</p></li>
38<li class="listitem"><p><code class="filename">ALTERNATIVE_PRIORITY</code> &#8208; The priority of
39 the binary.
40 The version with the most features should have the highest priority.</p></li>
41</ul></div>
42<p>
43 </p>
44<p>
45 Currently, the OpenEmbedded build system supports only one binary per package.
46 </p>
47</div></body>
48</html>