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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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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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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>Sync Task</title>
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</head>
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<body>
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<h2 id="get">Sync</h2>
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<p><em>Since Apache Ant 1.6</em></p>
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<h3>Description</h3>
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<p>Synchronize a target directory from the files defined in one or
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more <a href="../Types/resources.html#collection">resource collections</a>.</p>
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<p>Any file in the target directory that has not been matched by at least one of the nested resource
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collections gets removed. I.e. if you exclude a file in your sources and a file of that name is
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present in the target dir, it will get removed from the target.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>todir</td>
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<td>the target directory to sync with the resource collections</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>overwrite</td>
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<td>Overwrite existing files even if the destination files are newer.</td>
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<td>No; defaults to <q>false</q></td>
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</tr>
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<tr>
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<td>includeEmptyDirs</td>
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<td>Copy any empty directories included in the resource
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collection(s).<br/><strong>Note</strong>: this attribute also controls the behavior for any
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nested <code><preserveintarget></code> element. If this attribute is <q>false</q> (the
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default) empty directories that only exist in the target directory will be removed even if
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they are matched by the patterns of <code><preserveintarget></code>. This can be
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overridden by <code><preserveintarget></code>'s <var>preserveEmptyDirs</var>
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attribute.</td>
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<td>No; defaults to <q>false</q></td>
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</tr>
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<tr>
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<td>failonerror</td>
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<td>If set to <q>false</q>, log a warning message, but do not stop the build, when one of the
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nested filesets points to a directory that doesn't exist.</td>
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<td>No; defaults to <q>true</q></td>
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</tr>
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<tr>
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<td>verbose</td>
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<td>Log the files that are being copied.</td>
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<td>No; defaults to <q>false</q></td>
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</tr>
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<tr>
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<td>granularity</td>
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<td>The number of milliseconds leeway to give before deciding a file is out of date. This is
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needed because not every file system supports tracking the last modified time to the
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millisecond level. This can also be useful if source and target files live on separate
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machines with clocks being out of sync. <em>since Ant 1.6.2</em>.</td>
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<td>No; default is 0 milliseconds, or 2 seconds on DOS systems.</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>any resource collection</h4>
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<p><a href="../Types/resources.html#collection">resource collections</a> are used to select groups
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of files to copy.</p>
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<p>Prior to Ant 1.7 only <code><fileset></code> has been supported as a nested element.</p>
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<h4>preserveInTarget</h4>
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<p><em>Since Ant 1.7.0</em></p>
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<p>Specifies files or directories that should be kept in the target directory even if they are not
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present in one of the source directories.</p>
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<p>This nested element is like a <a href="../Types/fileset.html">FileSet</a> except that it doesn't
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support the <var>dir</var> attribute and the <var>usedefaultexcludes</var> attribute defaults
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to <q>false</q>.</p>
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<h5>Additional parameters</h5>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>preserveEmptyDirs</td>
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<td>Overrules the <var>includeEmptydirs</var> setting for directories matched by this element.
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If you want to preserve empty directories that are not in your source directory you can either
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set the task's <var>includeemptydirs</var> attribute or this one. If the two attribute values
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conflict, this attribute "wins".</td>
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<td>No; defaults to the value of the task's <var>includeemptydirs</var> attribute</td>
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</tr>
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</table>
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<h3>Examples</h3>
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<p>Overwrite all files in <samp>site</samp> with newer files from <samp>generated-site</samp>,
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delete files from <samp>site</samp> that are not present in <samp>generated-site</samp>.</p>
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<pre>
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<sync todir="site">
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<fileset dir="generated-site"/>
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</sync></pre>
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<p>Overwrite all files in <samp>site</samp> with newer files from <samp>generated-site</samp>,
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delete files from <samp>site</samp> that are not present in <samp>generated-site</samp> but keep all
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files in any <samp>CVS</samp> sub-directory.</p>
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<pre>
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<sync todir="site">
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<fileset dir="generated-site"/>
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<preserveintarget>
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<include name="**/CVS/**"/>
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</preserveintarget>
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</sync></pre>
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</body>
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</html>
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