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<title>Sync Task</title>
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<h2><a name="get">Sync</a></h2>
<p><em>Since Ant 1.6</em></p>
<h3>Description</h3>

<p>Synchronize a target directory from the files defined in one or
more <a href="../CoreTypes/resources.html#collection">Resource Collection</a>s.</p>

<p>Any file in the target directory that has not been matched by at
least one of the nested resource collections gets removed.  I.e. if you exclude a
file in your sources and a file of that name is present in the target
dir, it will get removed from the target.</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">todir</td>
    <td valign="top">the target directory to sync with the resource collections</td>
    <td align="center" valign="top">Yes</td>
  </tr>  
  <tr>
    <td valign="top">overwrite</td>
    <td valign="top">Overwrite existing files even if the destination
      files are newer.</td>
    <td valign="top" align="center">No; defaults to false.</td>
  </tr>
  <tr>
    <td valign="top">includeEmptyDirs</td>
     <td valign="top">Copy any empty directories included in the resource collection(s).
     </td>
     <td valign="top" align="center">No; defaults to false.</td>
  </tr>
  <tr>
    <td valign="top">failonerror</td>
     <td valign="top">If is set to false, log a warning message, but do not stop the build,
       when one of the nested filesets points to a directory that
       doesn't exist.
     </td>
     <td valign="top" align="center">No; defaults to true.</td>
  </tr>
  <tr>
    <td valign="top">verbose</td>
     <td valign="top">Log the files that are being copied.</td>
     <td valign="top" align="center">No; defaults to false.</td>
  </tr>
  <tr>
    <td valign="top">granularity</td>
    <td valign="top">The number of milliseconds leeway to give before
    deciding a file is out of date. This is needed because not every
    file system supports tracking the last modified time to the
    millisecond level. Default is 0 milliseconds, or 2 seconds on DOS
    systems.  This can also be useful if source and target files live
    on separate machines with clocks being out of sync.  <em>since Ant
    1.6.2</em>.</td>
     <td valign="top" align="center">No.</td>
  </tr>
</table>

<h3>Parameters specified as nested elements</h3>

<h4>fileset or any other resource collection</h4>
<p><a href="../CoreTypes/resources.html#collection">Resource
Collection</a>s are used to select groups of files to copy.  To use a
resource collection, the <code>todir</code> attribute must be set.</p>
<p>Prior to Ant 1.7 only <code>&lt;fileset&gt;</code> has been
supported as a nested element.</p>

<h4>preserveInTarget</h4>

<p>Specifies files or directories that should be kept in the target
directory even if they are not present in one of the source
directories.</p>

<p>This nested element is like a <a
href="../CoreTypes/fileset.html">FileSet</a> except that it doesn't
support the dir attribute and the usedefaultexcludes attribute
defaults to false.</p>

<h3>Examples</h3>

<blockquote><pre>
&lt;sync todir=&quot;site&quot;&gt;
  &lt;fileset dir=&quot;generated-site&quot;/&gt;
&lt;/sync&gt;
</pre></blockquote>
<p>overwrites all files in <em>site</em> with newer files from
<em>generated-site</em>, deletes files from <em>site</em> that are not
present in <em>generated-site</em>.</p>

<blockquote><pre>
&lt;sync todir=&quot;site&quot;&gt;
  &lt;fileset dir=&quot;generated-site&quot;/&gt;
  &lt;preserveintarget&gt;
    &lt;include name=&quot;**/CVS/**&quot;/&gt;
  &lt;/preserveintarget&gt;
&lt;/sync&gt;
</pre></blockquote>
<p>overwrites all files in <em>site</em> with newer files from
<em>generated-site</em>, deletes files from <em>site</em> that are not
present in <em>generated-site</em> but keeps all files in any
<em>CVS</em> sub-directory.</p>


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