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<html lang="en">
<head>
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Symlink Task</title>
</head>
<body>
<h2 id="symlink">Symlink</h2>
<h3>Description</h3>
<p>Manages symbolic links on platforms where Java supports symbolic links. Can be used to make an
individual link, delete a link, create multiple links from properties files, or create properties
files describing links in the specified directories. Existing files are not overwritten by
default.</p>
<p><a href="../Types/fileset.html">FileSet</a>s are used to select a set of links to record, or a
set of property files to create links from.</p>
<h3>Parameters</h3>
<table class="attr">
<tr>
<th scope="col">Attribute</th>
<th scope="col">Description</th>
<th scope="col">Required</th>
</tr>
<tr>
<td>action</td>
<td>The type of action to perform, may be <q>single</q>, "<q>record</q>, <q>recreate</q>
or <q>delete</q>.</td>
<td>No; defaults to <q>single</q></td>
</tr>
<tr>
<td>link</td>
<td>The name of the link to be created or deleted.<br/><strong>Note</strong>: this attribute is
resolved against the current working directory rather than the project's <var>basedir</var>
for historical reasons. It is recommended you always use an absolute path or a path
like <samp>${basedir}/some-path</samp> as its value.
</td>
<td>Yes, for <var>action</var>=<q>single</q> or <q>delete</q>; ignored in other actions</td>
</tr>
<tr>
<td>resource</td>
<td>The resource the link should point to.</td>
<td>Yes, for <var>action</var>=<q>single</q>; ignored in other actions</td>
</tr>
<tr>
<td>linkfilename</td>
<td>The name of the properties file to create in each included directory.</td>
<td>Yes, for <var>action</var>=<q>record</q>; ignored in other actions</td>
</tr>
<tr>
<td>overwrite</td>
<td>Overwrite existing files or not. If overwrite is set to <q>true</q>, then any existing file,
specified by the link attribute, will be overwritten irrespective of whether or not the
existing file is a symbolic link.</td>
<td>No; defaults to <q>false</q></td>
</tr>
<tr>
<td>failonerror</td>
<td>Stop build if true, log a warning message, but do not stop the build, when the an error
occurs if <q>false</q>.</td>
<td>No; defaults to <q>true</q></td>
</tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>fileset</h4>
<p><a href="../Types/fileset.html">FileSet</a>s are used when <var>action</var>=<q>record</q> to
select directories and link names to be recorded. They are also used
when <var>action</var>=<q>recreate</q> to specify both the name of the property files to be
processed, and the directories in which they can be found. At least one fileset is required for each
case.</p>
<h3>Examples</h3>
<p>Make a link named <samp>foo</samp> to a resource named <samp>bar.foo</samp>
in <samp>subdir</samp>:</p>
<pre><symlink link="${dir.top}/foo" resource="${dir.top}/subdir/bar.foo"/></pre>
<p>Record all links in <samp>subdir</samp> and it's descendants in files
named <samp>dir.links</samp></p>
<pre>
<symlink action="record" linkfilename="dir.links">
<fileset dir="${dir.top}" includes="subdir/**"/>
</symlink></pre>
<p>Recreate the links recorded in the previous example:</p>
<pre>
<symlink action="recreate">
<fileset dir="${dir.top}" includes="subdir/**/dir.links"/>
</symlink></pre>
<p>Delete a link named <samp>foo</samp>:</p>
<pre><symlink action="delete" link="${dir.top}/foo"/></pre>
<p><strong>Java 1.2 and earlier</strong>: Due to limitations on executing system level commands in
Java versions earlier than 1.3 this task may have difficulty operating with a relative path
in <code>ANT_HOME</code>. The typical symptom is an <code>IOException</code> where Apache Ant can't
find <samp>/some/working/directory${ANT_HOME}/bin/antRun</samp> or something similar. The workaround
is to change your <code>ANT_HOME</code> environment variable to an absolute path, which will remove
the <samp>/some/working/directory</samp> portion of the above path and allow Ant to find the correct
command line execution script.</p>
<p><strong>Note</strong>: <em>Since Ant 1.10.2</em>, this task relies on the symbolic link support
introduced in Java 7 through the <code class="code">java.nio.file.Files</code> APIs</p>
</body>
</html>
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