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diff --git a/html/usage4.html b/html/usage4.html new file mode 100644 index 0000000..7e2ce40 --- /dev/null +++ b/html/usage4.html @@ -0,0 +1,86 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html lang="en"> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<title>debtree - Package dependency graphs</title> +</head> + +<body> +<h1>debtree — package dependency graphs on steroids</h1> + +<table> +<tbody valign="top"> +<tr> +<td> +<h3><a href="index.html">Introduction</a></h3> + +<h3>Advanced usage examples</h3> + +<ol> +<li><a href="usage1.html">Create a build dependency graph</a></li> +<li><a href="usage2.html">Visualize what would happen when installing a package</a></li> +<li><a href="usage3.html">Dependencies on virtual packages</a></li> +<li><b>Reverse dependencies</b></li> +</ol> +<hr /> + +<p> +A reverse dependency graph shows why a package is installed: what other +packages depend on it. +</p><p> +This graph shows only installed packages (the <tt>-I</tt> option), with +the reverse dependencies in light blue. By default only one level of reverse +dependencies is displayed. In this example three levels are included as a +result of using the option <tt>--rdeps-depth=3</tt>. To show <i>only</i> +reverse dependencies, add the option <tt>--max-depth=0</tt>. +</p><p> +The colors of the arrows have the same meaning as for "forward" dependencies. +The inclusion of Recommends is controlled by the <tt>--no-recommends</tt> +option; displaying reverse dependencies of type Suggests is not supported. +</p><p> +The graph will always include all <i>direct</i> reverse dependencies +(both on the package itself and all virtual packages provided by it). +In the example some packages depend on <tt>apt</tt> itself, and others +on <tt>libapt-pkg-...</tt>. +</p><p> +As shown for <tt>debconf</tt>, the number of <i>indirect</i> reverse +dependencies that gets displayed, is by default limited to five, but that +can be changed by using the option <tt>--max_rdeps=<i>n</i></tt>. When +the individual packages are not shown, the number of packages per type of +dependency is shown next to their arrows. +</p><p> +It is possible to generate graphs that show all reverse dependencies, +both installed and not installed, but be warned that such graphs are +likely to explode in size. +</p><p> +Additional examples can be found in +<a href="http://alioth.debian.org/~fjp/log/posts/debtree-next_-_More_steroids.html">the author's blog</a>. +</p> + +</td> +<td width="10" /> +<td width="400"> + +<p><tt><font size="-1"> +$ debtree -I --rdeps-depth=3 apt +</font></tt></p> +<hr /> +<img src="thumbs/usage4.png" alt="Dependency graph for pidentd" /> +<hr /> +<table> +<tr> +<td>Generated .dot file:</td> +<td><a href="usage4.dot">DOT</a></td> +</tr><tr> +<td>Full-sized images:</td> +<td><a href="usage4.ps" target="_blank">PS</a> | PNG | <a href="usage4.svg" target="_blank">SVG</a></td> +</tr> +</table> + +</td> +</tr> +</tbody> +</table> + +</body> +</html> |