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diff --git a/html/usage3.html b/html/usage3.html new file mode 100644 index 0000000..e3be038 --- /dev/null +++ b/html/usage3.html @@ -0,0 +1,120 @@ +<!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><b>Dependencies on virtual packages</b></li> +<li><a href="usage4.html">Reverse dependencies</a></li> +</ol> +<hr /> + +<p> +The top graph for <tt>pident</tt> incudes three dependencies on virtual +packages and shows how virtual packages and the packages that provide +them can be displayed. +</p><p> +The first is a fairly common dependency on <tt>debconf | debconf-2.0</tt> +where the latter is a virtual package provided by either <tt>debconf</tt> +or <tt>cdebconf</tt>. <tt>debconf</tt> has square brackets because it is +also included in the alternative dependencies; <tt>cdebconf</tt> has curly +brackets because its dependencies are not included anywhere in the graph. +</p><p> +The second is the virtual package <tt>inet-superserver</tt>. Because the +maximum number of providers was set to 5 and there are 4 packages that +actually provide this virtual package, all providing packages are shown. +<tt>openbsd-inetd</tt> has square brackets because it was also displayed +as the preferred alternative; for the others no dependencies are shown +and thus their names have curly brackets. +</p><p> +The third is the virtual package <tt>ident-server</tt>. There are 7 packages +that provide this virtual package, which is more than the maximum that was +set. Therefore no individual providing packages are shown, but the total +number of providing packages is shown alongside the arrow for the +relationship. Note that the requested package <tt>pidentd</tt> is one of +the providing package. +</p><p> +Adding the option <tt>-I</tt> (show installed packages) when generating this +graph, could result in the bottom graph, which has the following changes: +</p> +<ul> +<li> +as <tt>debconf</tt> is installed, <tt>debconf-2.0</tt> is no longer +shown and thus the providing packages are not shown either; the ellipsis in +the second row indicates there are other packages that can satisfy the +alternative dependency +</li><li> +as <tt>openbsd-inetd</tt> is installed, only that providing package is shown +as alternative and thus again <tt>inet-superserver</tt> and its providing +packages are no longer included +</li><li> +as <tt>pidentd</tt> is installed, only that providing package is shown for +<tt>ident-server</tt>; as <tt>ident-server</tt> is provided by the requested +package, this virtual package is still shown; the ellipsis in the second row +indicates there are other (undisplayed) providing packages +</li> +</ul> + +<p>Note that for this second graph the option <tt>--max-providers<tt> is no +longer relevant.</p> + +</td> +<td width="10" /> +<td width="400"> + +<p><tt><font size="-1"> +$ debtree --max-providers=5 pident +</font></tt></p> +<hr /> +<img src="thumbs/usage3.1.png" alt="Dependency graph for pidentd" /> +<hr /> +<table> +<tr> +<td>Generated .dot file:</td> +<td><a href="usage3.1.dot">DOT</a></td> +</tr><tr> +<td>Full-sized images:</td> +<td><a href="usage3.1.ps" target="_blank">PS</a> | PNG | <a href="usage3.1.svg" target="_blank">SVG</a></td> +</tr> +</table> + +<br /> + +<p><tt><font size="-1"> +$ debtree -I pident +</font></tt></p> +<hr /> +<img src="thumbs/usage3.2.png" alt="Dependency graph for pidentd (with installed packages)" /> +<hr /> +<table> +<tr> +<td>Generated .dot file:</td> +<td><a href="usage3.2.dot">DOT</a></td> +</tr><tr> +<td>Full-sized images:</td> +<td><a href="usage3.2.ps" target="_blank">PS</a> | PNG | <a href="usage3.2.svg" target="_blank">SVG</a></td> +</tr> +</table> + +</td> +</tr> +</tbody> +</table> + +</body> +</html> |