git-patch-id.html

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 442 <div id="header">
 443 <h1>git-patch-id(1) Manual Page</h1>
 444 <h2 id="_name">NAME</h2>
 445 <div class="sectionbody">
 446 <p>git-patch-id - Compute unique ID for a patch</p>
 447 </div>
 448 </div>
 449 <div id="content">
 450 <div class="sect1">
 451 <h2 id="_synopsis">SYNOPSIS</h2>
 452 <div class="sectionbody">
 453 <div class="verseblock">
 454 <pre class="content"><em>git patch-id</em> [--stable | --unstable | --verbatim]</pre>
 455 </div>
 456 </div>
 457 </div>
 458 <div class="sect1">
 459 <h2 id="_description">DESCRIPTION</h2>
 460 <div class="sectionbody">
 461 <div class="paragraph">
 462 <p>Read a patch from the standard input and compute the patch ID for it.</p>
 463 </div>
 464 <div class="paragraph">
 465 <p>A "patch ID" is nothing but a sum of SHA-1 of the file diffs associated with a
 466 patch, with line numbers ignored.  As such, it&#8217;s "reasonably stable", but at
 467 the same time also reasonably unique, i.e., two patches that have the same
 468 "patch ID" are almost guaranteed to be the same thing.</p>
 469 </div>
 470 <div class="paragraph">
 471 <p>The main usecase for this command is to look for likely duplicate commits.</p>
 472 </div>
 473 <div class="paragraph">
 474 <p>When dealing with <em>git diff-tree</em> output, it takes advantage of
 475 the fact that the patch is prefixed with the object name of the
 476 commit, and outputs two 40-byte hexadecimal strings.  The first
 477 string is the patch ID, and the second string is the commit ID.
 478 This can be used to make a mapping from patch ID to commit ID.</p>
 479 </div>
 480 </div>
 481 </div>
 482 <div class="sect1">
 483 <h2 id="_options">OPTIONS</h2>
 484 <div class="sectionbody">
 485 <div class="dlist">
 486 <dl>
 487 <dt class="hdlist1">--verbatim</dt>
 488 <dd>
 489 <p>Calculate the patch-id of the input as it is given, do not strip
 490 any whitespace.</p>
 491 <div class="literalblock">
 492 <div class="content">
 493 <pre>This is the default if patchid.verbatim is true.</pre>
 494 </div>
 495 </div>
 496 </dd>
 497 <dt class="hdlist1">--stable</dt>
 498 <dd>
 499 <p>Use a "stable" sum of hashes as the patch ID. With this option:</p>
 500 <div class="ulist">
 501 <ul>
 502 <li>
 503 <p>Reordering file diffs that make up a patch does not affect the ID.
 504 In particular, two patches produced by comparing the same two trees
 505 with two different settings for "-O&lt;orderfile&gt;" result in the same
 506 patch ID signature, thereby allowing the computed result to be used
 507 as a key to index some meta-information about the change between
 508 the two trees;</p>
 509 </li>
 510 <li>
 511 <p>Result is different from the value produced by git 1.9 and older
 512 or produced when an "unstable" hash (see --unstable below) is
 513 configured - even when used on a diff output taken without any use
 514 of "-O&lt;orderfile&gt;", thereby making existing databases storing such
 515 "unstable" or historical patch-ids unusable.</p>
 516 </li>
 517 <li>
 518 <p>All whitespace within the patch is ignored and does not affect the id.</p>
 519 <div class="literalblock">
 520 <div class="content">
 521 <pre>This is the default if patchid.stable is set to true.</pre>
 522 </div>
 523 </div>
 524 </li>
 525 </ul>
 526 </div>
 527 </dd>
 528 <dt class="hdlist1">--unstable</dt>
 529 <dd>
 530 <p>Use an "unstable" hash as the patch ID. With this option,
 531 the result produced is compatible with the patch-id value produced
 532 by git 1.9 and older and whitespace is ignored.  Users with pre-existing
 533 databases storing patch-ids produced by git 1.9 and older (who do not deal
 534 with reordered patches) may want to use this option.</p>
 535 <div class="literalblock">
 536 <div class="content">
 537 <pre>This is the default.</pre>
 538 </div>
 539 </div>
 540 </dd>
 541 </dl>
 542 </div>
 543 </div>
 544 </div>
 545 <div class="sect1">
 546 <h2 id="_git">GIT</h2>
 547 <div class="sectionbody">
 548 <div class="paragraph">
 549 <p>Part of the <a href="git.html">git(1)</a> suite</p>
 550 </div>
 551 </div>
 552 </div>
 553 </div>
 554 <div id="footer">
 555 <div id="footer-text">
 556 Last updated 2022-11-04 21:49:36 -0700
 557 </div>
 558 </div>
 559 </body>
 560 </html>