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