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Previous: <a href="GIT-Export-Hooks.html#GIT-Export-Hooks" accesskey="p" rel="prev">GIT Export Hooks</a>, Up: <a href="Hooks.html#Hooks" accesskey="u" rel="up">Hooks</a> [<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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<a name="Validation-Hooks-1"></a>
<h4 class="subsection">6.1.12 Validation Hooks</h4>
<p>If there is a policy decision to make, Monotone defines certain hooks to
allow a client to validate or reject certain behaviors.
</p>
<dl compact="compact">
<dt><code>validate_changes (<var>revision_text</var>, <var>branchname</var>)</code>
<a name="index-validate_005fchanges-_0028revision_005ftext_002c-branchname_0029"></a>
</dt>
<dd>
<p>This hook is called by <code><a href="Workspace.html#mtn-commit">mtn commit</a></code> just after the
to-be-committed changes and the branch have been logically verified
and before the user enters his/her commit message.
<var>revision_text</var> is the full text of the changes for this revision,
which can be parsed with the <code><a href="Additional-Lua-Functions.html#parse_005fbasic_005fio">parse_basic_io</a></code> function. The
second parameter, <var>branchname</var>, is the branch for this commit -
unless it gets changed in <code><a href="User-Defaults.html#edit_005fcomment">edit_comment</a></code> later on.
</p>
<p>If the hook finds the changes satisfactory, it should return
<code>true, ""</code>. If it finds fault, then it should return <code>false,
reason</code> where <var>reason</var> is a string containing the reason the
changes were rejected. By default, this hook is not defined and acts
as if it returned <code>true, ""</code>.
</p>
</dd>
<dt><code>validate_commit_message (<var>message</var>, <var>revision_text</var>, <var>branchname</var>)</code>
<a name="index-validate_005fcommit_005fmessage-_0028message_002c-revision_005ftext_002c-branchname_0029"></a>
</dt>
<dd>
<p>This hook is called by <code><a href="Workspace.html#mtn-commit">mtn commit</a></code> after
<code><a href="User-Defaults.html#edit_005fcomment">edit_comment</a></code>. <var>message</var> is the result of
<code>edit_comment</code> and <var>revision_text</var> is the full text of the
changes for this revision, which can be parsed with the
<code><a href="Additional-Lua-Functions.html#parse_005fbasic_005fio">parse_basic_io</a></code> function. <var>branchname</var> is parsed from
the result of <code>edit_comment</code>.
</p>
<p>If the hook finds the commit message satisfactory, it should return
<code>true, ""</code>. If it finds fault, then it should return <code>false,
reason</code> where <var>reason</var> is a string containing the reason the
message was rejected. By default, this hook is not defined and acts as
if it returned <code>true, ""</code>.
</p>
</dd>
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