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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<body lang="en">
<a name="Attribute-Handling"></a>
<div class="header">
<p>
Next: <a href="GIT-Export-Hooks.html#GIT-Export-Hooks" accesskey="n" rel="next">GIT Export Hooks</a>, Previous: <a href="Selector-Expansion.html#Selector-Expansion" accesskey="p" rel="prev">Selector Expansion</a>, Up: <a href="Hooks.html#Hooks" accesskey="u" rel="up">Hooks</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Attribute-Handling-1"></a>
<h4 class="subsection">6.1.10 Attribute Handling</h4>

<p>Some files in a project are special; they may require different
handling (such as binary or structured files that should always be
manually merged &ndash; see <a href="Merge-Conflicts.html#File-Content-Conflict">File Content Conflict</a>), or they may
represent executable scripts or programs.
</p>
<p>Monotone allows each file (or directory) in a repository to carry
arbitrary <a href="File-Attributes.html#File-Attributes">File Attributes</a>.  Persistent attributes are stored in
each revision&rsquo;s manifest. The hooks in this section allow files to be
automatically recognised as having certain attributes at the time
they&rsquo;re added, and for custom triggers to be invoked on each file
according to its attributes when the workspace is changed.
</p>
<dl compact="compact">
<dd><a name="attr_005ffunctions"></a></dd>
<dt><code>attr_functions [<var>attribute</var>] (<var>filename</var>, <var>value</var>)</code>
<a name="index-attr_005ffunctions-_005battribute_005d-_0028filename_002c-value_0029"></a>
</dt>
<dd>
<p>This is not a hook function, but a <em>table</em> of hook functions,
indexed by <var>attribute</var>. Each entry in the table
<code>attr_functions</code> is a function taking a file name <var>filename</var>
and an attribute value <var>value</var>. The function should &ldquo;apply&rdquo; the
attribute to the file in the file system, possibly in a
platform-specific way.
</p>
<p>These hooks are called by any command that modifies workspace files,
including <code><a href="Workspace.html#mtn-revert">mtn revert</a></code>, <code><a href="Workspace.html#mtn-undrop">mtn undrop</a></code>,
<code><a href="Workspace.html#mtn-update">mtn update</a></code>, <code><a href="Tree.html#mtn-merge_005finto_005fworkspace">mtn merge_into_workspace</a></code>,
<code><a href="Workspace.html#mtn-pluck">mtn pluck</a></code>, <code><a href="Network.html#mtn-clone">mtn clone</a></code> and
<code><a href="Tree.html#mtn-checkout">mtn checkout</a></code>.
</p>
<p>When called to set an attribute, <var>value</var> is a string representing
the value of the attribute.
</p>
<p>When called to clear an attribute, <var>value</var> is <code>nil</code>.
</p>
<p>This facility can be used to extend monotone&rsquo;s understanding of files
with platform-specific attributes, such as permission bits, access
control lists, or special file types.
</p>
<p>By default, there is only one entry in this table, for the <code>mtn:execute</code>
attribute. It calls platform-specific functions to mark files as
executable or not. See <a href="Default-hooks.html#Default-hooks">Default hooks</a>.
</p>
<a name="attr_005finit_005ffunctions"></a></dd>
<dt><code>attr_init_functions [<var>attribute</var>] (<var>filename</var>)</code>
<a name="index-attr_005finit_005ffunctions-_005battribute_005d-_0028filename_0029"></a>
</dt>
<dd>
<p>This is not a hook function, but a <em>table</em> of hook
functions. Each entry in the table <code>attr_init_functions</code>, at
table entry <var>attribute</var>, is a function taking a file (or
directory) name <var>filename</var>. Each function returns <code>true</code> if
the attribute should be set on <var>filename</var>. This table of hook
functions is called once for each file during an <em>add</em>.
</p>
<p>By default, there are only two entries in this table, for the
<code>mtn:execute</code> and <code>mtn:manual_merge</code> attributes. Their
definition is:
</p>
<div class="smallexample">
<pre class="smallexample">attr_init_functions[&quot;mtn:execute&quot;] =
   function(filename)
      if (is_executable(filename)) then
        return &quot;true&quot;
      else
        return nil
      end
   end
attr_init_functions[&quot;mtn:manual_merge&quot;] =
   function(filename)
      if (binary_file(filename)) then
        return &quot;true&quot; -- binary files must be merged manually
      else
        return nil
      end
   end
</pre></div>

<p>The <code>binary_file</code> function is also defined as a Lua hook. See
<a href="Default-hooks.html#Default-hooks">Default hooks</a>.
</p>
</dd>
</dl>

<hr>
<div class="header">
<p>
Next: <a href="GIT-Export-Hooks.html#GIT-Export-Hooks" accesskey="n" rel="next">GIT Export Hooks</a>, Previous: <a href="Selector-Expansion.html#Selector-Expansion" accesskey="p" rel="prev">Selector Expansion</a>, Up: <a href="Hooks.html#Hooks" accesskey="u" rel="up">Hooks</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
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