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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Dependency resolution in aptitude</title><link rel="stylesheet" type="text/css" href="aptitude.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="index.html" title="aptitude user's manual" /><link rel="up" href="ch02s03.html" title="Resolving package dependencies" /><link rel="prev" href="ch02s03.html" title="Resolving package dependencies" /><link rel="next" href="ch02s03s02.html" title="Immediate dependency resolution" /><link rel="preface" href="pr01.html" title="Introduction" /><link rel="chapter" href="ch01.html" title="Chapter 1. Getting started" /><link rel="chapter" href="ch02.html" title="Chapter 2. aptitude reference guide" /><link rel="chapter" href="ch03.html" title="Chapter 3. aptitude frequently asked questions" /><link rel="chapter" href="ch04.html" title="Chapter 4. Credits" /><link rel="reference" href="rn01.html" title="Command-line reference" /><link rel="refentry" href="rn01re01.html" title="aptitude" /><link rel="refentry" href="rn01re02.html" title="aptitude-create-state-bundle" /><link rel="refentry" href="rn01re03.html" title="aptitude-run-state-bundle" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Dependency resolution in <span class="command"><strong>aptitude</strong></span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s03.html"><img src="images/prev.gif" alt="Prev" /></a> </td><th width="60%" align="center">Resolving package dependencies</th><td width="20%" align="right"> <a accesskey="n" href="ch02s03s02.html"><img src="images/next.gif" alt="Next" /></a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idm1927"></a>Dependency resolution in <span class="command"><strong>aptitude</strong></span></h3></div></div></div><p>
There are two main dependency resolution algorithms in
<span class="command"><strong>aptitude</strong></span>.
</p><p>
The first is an algorithm that is also used by programs such
as <span class="command"><strong>apt-get</strong></span> and <span class="command"><strong>synaptic</strong></span>; I will call
it <span class="quote">“<span class="quote">immediate resolution</span>”</span>. It is invoked
whenever you select a package for installation
interactively, and immediately after one or more packages
are marked for installation at the command-line. Immediate
resolution is fast and will solve most dependency problems,
but it is sometimes unable to find any solution.
</p><p>
The second algorithm, which I will call <span class="quote">“<span class="quote">interactive
resolution</span>”</span>, is invoked when packages have broken
dependencies even after immediate
resolution<a href="#ftn.idm1938" class="footnote" id="idm1938"><sup class="footnote">[11]</sup></a>. It can resolve more
dependencies, it allows you to review a solution before
applying it, and it allows you to provide feedback to the
resolver, guiding it towards a better solution.
</p><div class="footnotes"><br /><hr style="width:100; text-align:left;margin-left: 0" /><div id="ftn.idm1938" class="footnote"><p><a href="#idm1938" class="para"><sup class="para">[11] </sup></a>Or when immediate resolution is
disabled.</p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02s03.html"><img src="images/prev.gif" alt="Prev" /></a> </td><td width="20%" align="center"><a accesskey="u" href="ch02s03.html"><img src="images/up.gif" alt="Up" /></a></td><td width="40%" align="right"> <a accesskey="n" href="ch02s03s02.html"><img src="images/next.gif" alt="Next" /></a></td></tr><tr><td width="40%" align="left" valign="top">Resolving package dependencies </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="images/home.gif" alt="Home" /></a></td><td width="40%" align="right" valign="top"> Immediate dependency resolution</td></tr></table></div></body></html>
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