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 735 <body class="manpage">
 736 <div id="header">
 737 <h1>
 738 git-patch-id(1) Manual Page
 739 </h1>
 740 <h2>NAME</h2>
 741 <div class="sectionbody">
 742 <p>git-patch-id -
 743    Compute unique ID for a patch
 744 </p>
 745 </div>
 746 </div>
 747 <div id="content">
 748 <div class="sect1">
 749 <h2 id="_synopsis">SYNOPSIS</h2>
 750 <div class="sectionbody">
 751 <div class="verseblock">
 752 <pre class="content"><em>git patch-id</em> [--stable | --unstable | --verbatim]</pre>
 753 <div class="attribution">
 754 </div></div>
 755 </div>
 756 </div>
 757 <div class="sect1">
 758 <h2 id="_description">DESCRIPTION</h2>
 759 <div class="sectionbody">
 760 <div class="paragraph"><p>Read a patch from the standard input and compute the patch ID for it.</p></div>
 761 <div class="paragraph"><p>A "patch ID" is nothing but a sum of SHA-1 of the file diffs associated with a
 762 patch, with line numbers ignored.  As such, it&#8217;s "reasonably stable", but at
 763 the same time also reasonably unique, i.e., two patches that have the same
 764 "patch ID" are almost guaranteed to be the same thing.</p></div>
 765 <div class="paragraph"><p>The main usecase for this command is to look for likely duplicate commits.</p></div>
 766 <div class="paragraph"><p>When dealing with <em>git diff-tree</em> output, it takes advantage of
 767 the fact that the patch is prefixed with the object name of the
 768 commit, and outputs two 40-byte hexadecimal strings.  The first
 769 string is the patch ID, and the second string is the commit ID.
 770 This can be used to make a mapping from patch ID to commit ID.</p></div>
 771 </div>
 772 </div>
 773 <div class="sect1">
 774 <h2 id="_options">OPTIONS</h2>
 775 <div class="sectionbody">
 776 <div class="dlist"><dl>
 777 <dt class="hdlist1">
 778 --verbatim
 779 </dt>
 780 <dd>
 781 <p>
 782         Calculate the patch-id of the input as it is given, do not strip
 783         any whitespace.
 784 </p>
 785 <div class="literalblock">
 786 <div class="content">
 787 <pre><code>This is the default if patchid.verbatim is true.</code></pre>
 788 </div></div>
 789 </dd>
 790 <dt class="hdlist1">
 791 --stable
 792 </dt>
 793 <dd>
 794 <p>
 795         Use a "stable" sum of hashes as the patch ID. With this option:
 796 </p>
 797 <div class="ulist"><ul>
 798 <li>
 799 <p>
 800 Reordering file diffs that make up a patch does not affect the ID.
 801            In particular, two patches produced by comparing the same two trees
 802            with two different settings for "-O&lt;orderfile&gt;" result in the same
 803            patch ID signature, thereby allowing the computed result to be used
 804            as a key to index some meta-information about the change between
 805            the two trees;
 806 </p>
 807 </li>
 808 <li>
 809 <p>
 810 Result is different from the value produced by git 1.9 and older
 811            or produced when an "unstable" hash (see --unstable below) is
 812            configured - even when used on a diff output taken without any use
 813            of "-O&lt;orderfile&gt;", thereby making existing databases storing such
 814            "unstable" or historical patch-ids unusable.
 815 </p>
 816 </li>
 817 <li>
 818 <p>
 819 All whitespace within the patch is ignored and does not affect the id.
 820 </p>
 821 <div class="literalblock">
 822 <div class="content">
 823 <pre><code>This is the default if patchid.stable is set to true.</code></pre>
 824 </div></div>
 825 </li>
 826 </ul></div>
 827 </dd>
 828 <dt class="hdlist1">
 829 --unstable
 830 </dt>
 831 <dd>
 832 <p>
 833         Use an "unstable" hash as the patch ID. With this option,
 834         the result produced is compatible with the patch-id value produced
 835         by git 1.9 and older and whitespace is ignored.  Users with pre-existing
 836         databases storing patch-ids produced by git 1.9 and older (who do not deal
 837         with reordered patches) may want to use this option.
 838 </p>
 839 <div class="literalblock">
 840 <div class="content">
 841 <pre><code>This is the default.</code></pre>
 842 </div></div>
 843 </dd>
 844 </dl></div>
 845 </div>
 846 </div>
 847 <div class="sect1">
 848 <h2 id="_git">GIT</h2>
 849 <div class="sectionbody">
 850 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
 851 </div>
 852 </div>
 853 </div>
 854 <div id="footnotes"><hr /></div>
 855 <div id="footer">
 856 <div id="footer-text">
 857 Last updated
 858  2022-11-04 21:49:36 PDT
 859 </div>
 860 </div>
 861 </body>
 862 </html>