git-describe.html

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 441 <body class="manpage">
 442 <div id="header">
 443 <h1>git-describe(1) Manual Page</h1>
 444 <h2 id="_name">NAME</h2>
 445 <div class="sectionbody">
 446 <p>git-describe - Give an object a human readable name based on an available ref</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 describe</em> [--all] [--tags] [--contains] [--abbrev=&lt;n&gt;] [&lt;commit-ish&gt;&#8230;&#8203;]
 455 <em>git describe</em> [--all] [--tags] [--contains] [--abbrev=&lt;n&gt;] --dirty[=&lt;mark&gt;]
 456 <em>git describe</em> &lt;blob&gt;</pre>
 457 </div>
 458 </div>
 459 </div>
 460 <div class="sect1">
 461 <h2 id="_description">DESCRIPTION</h2>
 462 <div class="sectionbody">
 463 <div class="paragraph">
 464 <p>The command finds the most recent tag that is reachable from a
 465 commit.  If the tag points to the commit, then only the tag is
 466 shown.  Otherwise, it suffixes the tag name with the number of
 467 additional commits on top of the tagged object and the
 468 abbreviated object name of the most recent commit. The result
 469 is a "human-readable" object name which can also be used to
 470 identify the commit to other git commands.</p>
 471 </div>
 472 <div class="paragraph">
 473 <p>By default (without --all or --tags) <code>git</code> <code>describe</code> only shows
 474 annotated tags.  For more information about creating annotated tags
 475 see the -a and -s options to <a href="git-tag.html">git-tag(1)</a>.</p>
 476 </div>
 477 <div class="paragraph">
 478 <p>If the given object refers to a blob, it will be described
 479 as <em>&lt;commit-ish&gt;</em><code>:</code><em>&lt;path&gt;</em>, such that the blob can be found
 480 at <em>&lt;path&gt;</em> in the <em>&lt;commit-ish&gt;</em>, which itself describes the
 481 first commit in which this blob occurs in a reverse revision walk
 482 from HEAD.</p>
 483 </div>
 484 </div>
 485 </div>
 486 <div class="sect1">
 487 <h2 id="_options">OPTIONS</h2>
 488 <div class="sectionbody">
 489 <div class="dlist">
 490 <dl>
 491 <dt class="hdlist1">&lt;commit-ish&gt;&#8230;&#8203;</dt>
 492 <dd>
 493 <p>Commit-ish object names to describe.  Defaults to HEAD if omitted.</p>
 494 </dd>
 495 <dt class="hdlist1">--dirty[=&lt;mark&gt;]</dt>
 496 <dt class="hdlist1">--broken[=&lt;mark&gt;]</dt>
 497 <dd>
 498 <p>Describe the state of the working tree.  When the working
 499 tree matches HEAD, the output is the same as "git describe
 500 HEAD".  If the working tree has local modification "-dirty"
 501 is appended to it.  If a repository is corrupt and Git
 502 cannot determine if there is local modification, Git will
 503 error out, unless &#8216;--broken&#8217; is given, which appends
 504 the suffix "-broken" instead.</p>
 505 </dd>
 506 <dt class="hdlist1">--all</dt>
 507 <dd>
 508 <p>Instead of using only the annotated tags, use any ref
 509 found in <code>refs/</code> namespace.  This option enables matching
 510 any known branch, remote-tracking branch, or lightweight tag.</p>
 511 </dd>
 512 <dt class="hdlist1">--tags</dt>
 513 <dd>
 514 <p>Instead of using only the annotated tags, use any tag
 515 found in <code>refs/tags</code> namespace.  This option enables matching
 516 a lightweight (non-annotated) tag.</p>
 517 </dd>
 518 <dt class="hdlist1">--contains</dt>
 519 <dd>
 520 <p>Instead of finding the tag that predates the commit, find
 521 the tag that comes after the commit, and thus contains it.
 522 Automatically implies --tags.</p>
 523 </dd>
 524 <dt class="hdlist1">--abbrev=&lt;n&gt;</dt>
 525 <dd>
 526 <p>Instead of using the default number of hexadecimal digits (which
 527 will vary according to the number of objects in the repository with
 528 a default of 7) of the abbreviated object name, use &lt;n&gt; digits, or
 529 as many digits as needed to form a unique object name. An &lt;n&gt; of 0
 530 will suppress long format, only showing the closest tag.</p>
 531 </dd>
 532 <dt class="hdlist1">--candidates=&lt;n&gt;</dt>
 533 <dd>
 534 <p>Instead of considering only the 10 most recent tags as
 535 candidates to describe the input commit-ish consider
 536 up to &lt;n&gt; candidates.  Increasing &lt;n&gt; above 10 will take
 537 slightly longer but may produce a more accurate result.
 538 An &lt;n&gt; of 0 will cause only exact matches to be output.</p>
 539 </dd>
 540 <dt class="hdlist1">--exact-match</dt>
 541 <dd>
 542 <p>Only output exact matches (a tag directly references the
 543 supplied commit).  This is a synonym for --candidates=0.</p>
 544 </dd>
 545 <dt class="hdlist1">--debug</dt>
 546 <dd>
 547 <p>Verbosely display information about the searching strategy
 548 being employed to standard error.  The tag name will still
 549 be printed to standard out.</p>
 550 </dd>
 551 <dt class="hdlist1">--long</dt>
 552 <dd>
 553 <p>Always output the long format (the tag, the number of commits
 554 and the abbreviated commit name) even when it matches a tag.
 555 This is useful when you want to see parts of the commit object name
 556 in "describe" output, even when the commit in question happens to be
 557 a tagged version.  Instead of just emitting the tag name, it will
 558 describe such a commit as v1.2-0-gdeadbee (0th commit since tag v1.2
 559 that points at object deadbee&#8230;&#8203;.).</p>
 560 </dd>
 561 <dt class="hdlist1">--match &lt;pattern&gt;</dt>
 562 <dd>
 563 <p>Only consider tags matching the given <code>glob</code>(<code>7</code>) pattern,
 564 excluding the "refs/tags/" prefix. If used with <code>--all</code>, it also
 565 considers local branches and remote-tracking references matching the
 566 pattern, excluding respectively "refs/heads/" and "refs/remotes/"
 567 prefix; references of other types are never considered. If given
 568 multiple times, a list of patterns will be accumulated, and tags
 569 matching any of the patterns will be considered.  Use <code>--no-match</code> to
 570 clear and reset the list of patterns.</p>
 571 </dd>
 572 <dt class="hdlist1">--exclude &lt;pattern&gt;</dt>
 573 <dd>
 574 <p>Do not consider tags matching the given <code>glob</code>(<code>7</code>) pattern, excluding
 575 the "refs/tags/" prefix. If used with <code>--all</code>, it also does not consider
 576 local branches and remote-tracking references matching the pattern,
 577 excluding respectively "refs/heads/" and "refs/remotes/" prefix;
 578 references of other types are never considered. If given multiple times,
 579 a list of patterns will be accumulated and tags matching any of the
 580 patterns will be excluded. When combined with --match a tag will be
 581 considered when it matches at least one --match pattern and does not
 582 match any of the --exclude patterns. Use <code>--no-exclude</code> to clear and
 583 reset the list of patterns.</p>
 584 </dd>
 585 <dt class="hdlist1">--always</dt>
 586 <dd>
 587 <p>Show uniquely abbreviated commit object as fallback.</p>
 588 </dd>
 589 <dt class="hdlist1">--first-parent</dt>
 590 <dd>
 591 <p>Follow only the first parent commit upon seeing a merge commit.
 592 This is useful when you wish to not match tags on branches merged
 593 in the history of the target commit.</p>
 594 </dd>
 595 </dl>
 596 </div>
 597 </div>
 598 </div>
 599 <div class="sect1">
 600 <h2 id="_examples">EXAMPLES</h2>
 601 <div class="sectionbody">
 602 <div class="paragraph">
 603 <p>With something like git.git current tree, I get:</p>
 604 </div>
 605 <div class="literalblock">
 606 <div class="content">
 607 <pre>[torvalds@g5 git]$ git describe parent
 608 v1.0.4-14-g2414721</pre>
 609 </div>
 610 </div>
 611 <div class="paragraph">
 612 <p>i.e. the current head of my "parent" branch is based on v1.0.4,
 613 but since it has a few commits on top of that,
 614 describe has added the number of additional commits ("14") and
 615 an abbreviated object name for the commit itself ("2414721")
 616 at the end.</p>
 617 </div>
 618 <div class="paragraph">
 619 <p>The number of additional commits is the number
 620 of commits which would be displayed by "git log v1.0.4..parent".
 621 The hash suffix is "-g" + an unambiguous abbreviation for the tip commit
 622 of parent (which was <code>2414721b194453f058079d897d13c4e377f92dc6</code>). The
 623 length of the abbreviation scales as the repository grows, using the
 624 approximate number of objects in the repository and a bit of math
 625 around the birthday paradox, and defaults to a minimum of 7.
 626 The "g" prefix stands for "git" and is used to allow describing the version of
 627 a software depending on the SCM the software is managed with. This is useful
 628 in an environment where people may use different SCMs.</p>
 629 </div>
 630 <div class="paragraph">
 631 <p>Doing a <em>git describe</em> on a tag-name will just show the tag name:</p>
 632 </div>
 633 <div class="literalblock">
 634 <div class="content">
 635 <pre>[torvalds@g5 git]$ git describe v1.0.4
 636 v1.0.4</pre>
 637 </div>
 638 </div>
 639 <div class="paragraph">
 640 <p>With --all, the command can use branch heads as references, so
 641 the output shows the reference path as well:</p>
 642 </div>
 643 <div class="literalblock">
 644 <div class="content">
 645 <pre>[torvalds@g5 git]$ git describe --all --abbrev=4 v1.0.5^2
 646 tags/v1.0.0-21-g975b</pre>
 647 </div>
 648 </div>
 649 <div class="literalblock">
 650 <div class="content">
 651 <pre>[torvalds@g5 git]$ git describe --all --abbrev=4 HEAD^
 652 heads/lt/describe-7-g975b</pre>
 653 </div>
 654 </div>
 655 <div class="paragraph">
 656 <p>With --abbrev set to 0, the command can be used to find the
 657 closest tagname without any suffix:</p>
 658 </div>
 659 <div class="literalblock">
 660 <div class="content">
 661 <pre>[torvalds@g5 git]$ git describe --abbrev=0 v1.0.5^2
 662 tags/v1.0.0</pre>
 663 </div>
 664 </div>
 665 <div class="paragraph">
 666 <p>Note that the suffix you get if you type these commands today may be
 667 longer than what Linus saw above when he ran these commands, as your
 668 Git repository may have new commits whose object names begin with
 669 975b that did not exist back then, and "-g975b" suffix alone may not
 670 be sufficient to disambiguate these commits.</p>
 671 </div>
 672 </div>
 673 </div>
 674 <div class="sect1">
 675 <h2 id="_search_strategy">SEARCH STRATEGY</h2>
 676 <div class="sectionbody">
 677 <div class="paragraph">
 678 <p>For each commit-ish supplied, <em>git describe</em> will first look for
 679 a tag which tags exactly that commit.  Annotated tags will always
 680 be preferred over lightweight tags, and tags with newer dates will
 681 always be preferred over tags with older dates.  If an exact match
 682 is found, its name will be output and searching will stop.</p>
 683 </div>
 684 <div class="paragraph">
 685 <p>If an exact match was not found, <em>git describe</em> will walk back
 686 through the commit history to locate an ancestor commit which
 687 has been tagged.  The ancestor&#8217;s tag will be output along with an
 688 abbreviation of the input commit-ish&#8217;s SHA-1. If <code>--first-parent</code> was
 689 specified then the walk will only consider the first parent of each
 690 commit.</p>
 691 </div>
 692 <div class="paragraph">
 693 <p>If multiple tags were found during the walk then the tag which
 694 has the fewest commits different from the input commit-ish will be
 695 selected and output.  Here fewest commits different is defined as
 696 the number of commits which would be shown by <code>git</code> <code>log</code> <code>tag</code><code>..</code><code>input</code>
 697 will be the smallest number of commits possible.</p>
 698 </div>
 699 </div>
 700 </div>
 701 <div class="sect1">
 702 <h2 id="_bugs">BUGS</h2>
 703 <div class="sectionbody">
 704 <div class="paragraph">
 705 <p>Tree objects as well as tag objects not pointing at commits, cannot be described.
 706 When describing blobs, the lightweight tags pointing at blobs are ignored,
 707 but the blob is still described as &lt;commit-ish&gt;:&lt;path&gt; despite the lightweight
 708 tag being favorable.</p>
 709 </div>
 710 </div>
 711 </div>
 712 <div class="sect1">
 713 <h2 id="_git">GIT</h2>
 714 <div class="sectionbody">
 715 <div class="paragraph">
 716 <p>Part of the <a href="git.html">git(1)</a> suite</p>
 717 </div>
 718 </div>
 719 </div>
 720 </div>
 721 <div id="footer">
 722 <div id="footer-text">
 723 Last updated 2023-06-23 13:24:09 -0700
 724 </div>
 725 </div>
 726 </body>
 727 </html>