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<div id="header">
<h1>
git-patch-id(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>git-patch-id -
Compute unique ID for a patch
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>git patch-id</em> [--stable | --unstable | --verbatim]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Read a patch from the standard input and compute the patch ID for it.</p></div>
<div class="paragraph"><p>A "patch ID" is nothing but a sum of SHA-1 of the file diffs associated with a
patch, with line numbers ignored. As such, it’s "reasonably stable", but at
the same time also reasonably unique, i.e., two patches that have the same
"patch ID" are almost guaranteed to be the same thing.</p></div>
<div class="paragraph"><p>The main usecase for this command is to look for likely duplicate commits.</p></div>
<div class="paragraph"><p>When dealing with <em>git diff-tree</em> output, it takes advantage of
the fact that the patch is prefixed with the object name of the
commit, and outputs two 40-byte hexadecimal strings. The first
string is the patch ID, and the second string is the commit ID.
This can be used to make a mapping from patch ID to commit ID.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
--verbatim
</dt>
<dd>
<p>
Calculate the patch-id of the input as it is given, do not strip
any whitespace.
</p>
<div class="literalblock">
<div class="content">
<pre><code>This is the default if patchid.verbatim is true.</code></pre>
</div></div>
</dd>
<dt class="hdlist1">
--stable
</dt>
<dd>
<p>
Use a "stable" sum of hashes as the patch ID. With this option:
</p>
<div class="ulist"><ul>
<li>
<p>
Reordering file diffs that make up a patch does not affect the ID.
In particular, two patches produced by comparing the same two trees
with two different settings for "-O<orderfile>" result in the same
patch ID signature, thereby allowing the computed result to be used
as a key to index some meta-information about the change between
the two trees;
</p>
</li>
<li>
<p>
Result is different from the value produced by git 1.9 and older
or produced when an "unstable" hash (see --unstable below) is
configured - even when used on a diff output taken without any use
of "-O<orderfile>", thereby making existing databases storing such
"unstable" or historical patch-ids unusable.
</p>
</li>
<li>
<p>
All whitespace within the patch is ignored and does not affect the id.
</p>
<div class="literalblock">
<div class="content">
<pre><code>This is the default if patchid.stable is set to true.</code></pre>
</div></div>
</li>
</ul></div>
</dd>
<dt class="hdlist1">
--unstable
</dt>
<dd>
<p>
Use an "unstable" hash as the patch ID. With this option,
the result produced is compatible with the patch-id value produced
by git 1.9 and older and whitespace is ignored. Users with pre-existing
databases storing patch-ids produced by git 1.9 and older (who do not deal
with reordered patches) may want to use this option.
</p>
<div class="literalblock">
<div class="content">
<pre><code>This is the default.</code></pre>
</div></div>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
2024-05-31 00:41:06 UTC
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