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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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<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>Chmod Task</title>
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</head>
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<body>
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<h2 id="chmod">Chmod</h2>
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<h3>Description</h3>
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<p>Changes the permissions of a file or all files inside specified directories. Right now it has
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effect only under Unix or NonStop Kernel (Tandem). The permissions are also UNIX style, like the
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argument for the <kbd>chmod</kbd> command.</p>
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<p>See the section on <a href="../dirtasks.html#directorybasedtasks">directory based tasks</a>, on
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how the inclusion/exclusion of files works, and how to write patterns.</p>
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<p>This task holds an implicit <a href="../Types/fileset.html">FileSet</a> and supports all of
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FileSet's attributes and nested elements directly. More sets can be specified using
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nested <code><fileset></code> or <code><dirset></code> (<em>since Apache Ant 1.6</em>)
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elements.</p>
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<p><em>Since Ant 1.6</em>, this task also supports
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nested <a href="../Types/filelist.html">filelist</a>s.</p>
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<p><em>Since Ant 1.7</em>, this task supports
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arbitrary <a href="../Types/resources.html#collection">resource collections</a> as nested
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elements.</p>
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<p>By default this task will use a single invocation of the underlying <kbd>chmod</kbd> command.
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If you are working on a large number of files this may result in a command line that is too long for
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your operating system. If you encounter such problems, you should set the <var>maxparallel</var>
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attribute of this task to a non-zero value. The number to use highly depends on the length of your
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file names (the depth of your directory tree) and your operating system, so you'll have to
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experiment a little. POSIX recommends command line length limits of at least 4096 characters, this
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may give you an approximation for the number you could use as initial value for these
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experiments.</p>
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<p>By default this task won't do anything unless it detects it is running on a Unix system. If you
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know for sure that you have a <kbd>chmod</kbd> executable on your <code>PATH</code> that is
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command line compatible with the Unix command, you can use the task's <var>os</var> attribute and
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set its value to your current OS.</p>
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<p>See the <a href="setpermissions.html">setpermissions</a> task for a platform independent
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alternative.</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>file</td>
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<td>the file or single directory of which the permissions must be changed.</td>
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<td rowspan="2">Exactly one of the two, unless
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nested <code><fileset|filelist|dirset></code> elements are specified</td>
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</tr>
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<tr>
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<td>dir</td>
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<td class="left">the directory which holds the files whose permissions must be
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changed.<br/><strong>Note</strong>: for backwards compatibility reasons <code><chmod
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dir="some-dir"/></code> will only change the permissions on <samp>some-dir</samp> but not
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recurse into it, unless you also specify any patterns.</td>
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</tr>
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<tr>
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<td>perm</td>
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<td>the new permissions.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>includes</td>
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<td>comma- or space-separated list of patterns of files that must be included.</td>
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<td>No; defaults to all (<q>**</q>)</td>
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</tr>
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<tr>
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<td>excludes</td>
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<td>comma- or space-separated list of patterns of files that must be excluded.</td>
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<td>No; defaults to default excludes or none if <var>defaultexcludes</var> is <q>no</q></td>
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</tr>
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<tr>
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<td>defaultexcludes</td>
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<td>indicates whether default excludes should be used or not (<q>yes|no</q>).</td>
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<td>No; defaults to <q>yes</q></td>
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</tr>
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<tr>
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<td>parallel</td>
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<td>process all specified files using a single <kbd>chmod</kbd> command.</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>type</td>
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<td>One of <q>file</q>, <q>dir</q> or <q>both</q>. If set to <q>file</q>, only the permissions
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of plain files are going to be changed. If set to <q>dir</q>, only the directories are
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considered.<br/><strong>Note</strong>: The type attribute does not apply to
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nested <code>dirset</code>s—<code>dirset</code>s always implicitly assume type to
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be <q>dir</q>.</td>
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<td>No; default is <q>file</q></td>
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</tr>
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<tr>
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<td>maxparallel</td>
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<td>Limit the amount of parallelism by passing at most this many sourcefiles at once. Set it to
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negative integer for unlimited. <em>Since Ant 1.6</em>.</td>
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<td>No; defaults to unlimited</td>
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</tr>
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<tr>
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<td>verbose</td>
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<td>Whether to print a summary after execution or not. <em>Since Ant 1.6</em>.</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>os</td>
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<td>list of Operating Systems on which the command may be executed.</td>
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<td>No</td>
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</tr>
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<tr>
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<td>osfamily</td>
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<td>OS family as used in the <a href="conditions.html#os"><os></a> condition.</td>
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<td>No; defaults to <q>unix</q></td>
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</tr>
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</table>
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<h3>Examples</h3>
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<p>Make the <samp>start.sh</samp> file readable and executable for anyone on a UNIX system.</p>
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<pre><chmod file="${dist}/start.sh" perm="ugo+rx"/></pre>
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<p>Make the <samp>start.sh</samp> file readable, writable and executable only for the owner on a
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UNIX system.</p>
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<pre><chmod file="${dist}/start.sh" perm="700"/></pre>
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<p>Make all <samp>.sh</samp> files below <samp>${dist}/bin</samp> readable and executable for anyone
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on a UNIX system.</p>
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<pre>
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<chmod dir="${dist}/bin" perm="ugo+rx"
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includes="**/*.sh"/></pre>
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<p>Make all files below <samp>shared/sources1</samp> (except those below any directory
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named <samp>trial</samp>) writable for members of the same group on a UNIX system. In addition, all
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files belonging to a FileSet with <var>id</var> <samp>other.shared.sources</samp> get the same
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permissions.</p>
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<pre>
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<chmod perm="g+w">
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<fileset dir="shared/sources1">
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<exclude name="**/trial/**"/>
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</fileset>
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<fileset refid="other.shared.sources"/>
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</chmod></pre>
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<p>Keep non-owners from touching <code>cgi</code> scripts, files with a <samp>.old</samp> extension
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or directories beginning with <samp>private_</samp>. A directory ending in <samp>.old</samp> or a
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file beginning with <samp>private_</samp> would remain unaffected.</p>
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<pre>
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<chmod perm="go-rwx" type="file">
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<fileset dir="/web">
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<include name="**/*.cgi"/>
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<include name="**/*.old"/>
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</fileset>
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<dirset dir="/web">
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<include name="**/private_*"/>
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</dirset>
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</chmod></pre>
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<h3>Note on <var>maxparallel</var> attribute</h3>
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<p>Some shells have a limit of the number of characters that a command line may contain. This
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maximum limit varies from shell to shell and from operating system to operating system. If one has
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a large number of files to change mode on, consider using the <var>maxparallel</var> attribute. For
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example when using AIX and the limit is reached, the system responds with a warning: <code>"Warning:
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UNIXProcess.forkAndExec native error: The parameter or environment lists are too long"</code>. A
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value of about 300 seems to result in a command line that is acceptable.</p>
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</body>
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</html>
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