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125 lines
4.8 KiB
HTML
125 lines
4.8 KiB
HTML
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<title>Symlink Task</title>
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</head>
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<body>
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<h2><a name="symlink">Symlink</a></h2>
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<h3>Description</h3>
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<p> Manages symbolic links on Unix based platforms. Can be used to
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make an individual link, delete a link, create multiple links from properties files,
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or create properties files describing links in the specified directories.
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Existing links are not overwritten by default.
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<p><a href="../CoreTypes/fileset.html">FileSet</a>s are used to select a
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set of links to record, or a set of property files to create links from. </p>
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<h3>Parameters</h3>
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<table border="1" cellpadding="2" cellspacing="0">
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<tr>
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<td valign="top"><b>Attribute</b></td>
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<td valign="top"><b>Description</b></td>
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<td align="center" valign="top"><b>Required</b></td>
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</tr>
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<tr>
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<td valign="top">action</td>
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<td valign="top">The type of action to perform, may be "single",
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"record", "recreate" or "delete".</td>
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<td valign="top" align="center">No, defaults to single.</td>
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</tr>
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<tr>
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<td valign="top">link</td>
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<td valign="top">The name of the link to be created or deleted.</td>
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<td valign="center" align="center" >required for
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action="single" or "delete". Ignored in other actions.</td>
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</tr>
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<tr>
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<td valign="top">resource</td>
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<td valign="top">The resource the link should point to.</td>
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<td valign="top" align="center">required for action="single". Ignored in other actions.</td>
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</tr>
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<tr>
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<td valign="top">linkfilename</td>
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<td valign="top">The name of the properties file to create in
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each included directory.</td>
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<td valign="top" align="center">required for action="record".
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Ignored in other actions.</td>
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</tr>
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<tr>
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<td valign="top">overwrite</td>
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<td valign="top">Overwrite existing links or not.</td>
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<td valign="top" align="center">No; defaults to false.</td>
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</tr>
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<tr>
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<td valign="top">failonerror</td>
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<td valign="top">Stop build if true, log a warning message, but do not stop the build,
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when the an error occurs if false.
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</td>
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<td valign="top" align="center">No; defaults to true.</td>
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</tr>
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</table>
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<h3>Parameters specified as nested elements</h3>
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<h4>fileset</h4>
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<p><a href="../CoreTypes/fileset.html">FileSet</a>s
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are used when action = "record" to select directories and linknames to be recorded.
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They are also used when action = "recreate" to specify both the name of the property
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files to be processed, and the directories in which they can be found. At least one
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fileset is required for each case.</p>
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<h3>Examples</h3>
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<p> Make a link named "foo" to a resource named "bar.foo" in subdir:</p>
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<pre>
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<symlink link="${dir.top}/foo" resource="${dir.top}/subdir/bar.foo"/>
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</pre>
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<p> Record all links in subdir and it's descendants in files named
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"dir.links"</p>
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<pre>
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<symlink action="record" linkfilename="dir.links">
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<fileset dir="${dir.top}" includes="subdir/**" />
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</symlink>
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</pre>
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<p> Recreate the links recorded in the previous example:</p>
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<pre>
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<symlink action="recreate">
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<fileset dir="${dir.top}" includes="subdir/**/dir.links" />
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</symlink>
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</pre>
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<p> Delete a link named "foo":
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<pre>
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<symlink action="delete" link="${dir.top}/foo"/>
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</pre>
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<p><strong>Java 1.2 and earlier:</strong> Due to limitations on executing system
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level comands in Java versions earlier than 1.3 this task may have difficulty
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operating with a relative path in ANT_HOME. The typical symptom is an
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IOException where ant can't find /some/working/directory${ANT_HOME}/bin/antRun
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or something similar. The workaround is to change your ANT_HOME environment
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variable to an absolute path, which will remove the /some/working/directory portion
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of the above path and allow ant to find the correct commandline execution script.
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<p><strong>LIMITATIONS:</strong> Because Java has no direct support for
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handling symlinks this task divines them by comparing canonical and
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absolute paths. On non-unix systems this may cause false positives.
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Furthermore, any operating system on which the command
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<code>ln -s <linkname> <resourcename></code> is not a valid
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command on the comand line will not be able to use action="single" or
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action="recreate". Action="record" and action=delete should still work. Finally,
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the lack of support for symlinks in Java means that all links are recorded as
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links to the <strong>canonical</strong> resource name. Therefore the link:
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<code>link --> subdir/dir/../foo.bar</code> will be recorded as
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<code>link=subdir/foo.bar</code> and restored as
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<code>link --> subdir/foo.bar</code></p>
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<hr><p align="center">Copyright © 2002 Apache Software
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Foundation. All rights Reserved.</p>
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</body>
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</html>
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