git-check-ref-format.html

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 441 <body class="manpage">
 442 <div id="header">
 443 <h1>git-check-ref-format(1) Manual Page</h1>
 444 <h2 id="_name">NAME</h2>
 445 <div class="sectionbody">
 446 <p>git-check-ref-format - Ensures that a reference name is well formed</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 check-ref-format</em> [--normalize]
 455        [--[no-]allow-onelevel] [--refspec-pattern]
 456        &lt;refname&gt;
 457 <em>git check-ref-format</em> --branch &lt;branchname-shorthand&gt;</pre>
 458 </div>
 459 </div>
 460 </div>
 461 <div class="sect1">
 462 <h2 id="_description">DESCRIPTION</h2>
 463 <div class="sectionbody">
 464 <div class="paragraph">
 465 <p>Checks if a given <em>refname</em> is acceptable, and exits with a non-zero
 466 status if it is not.</p>
 467 </div>
 468 <div class="paragraph">
 469 <p>A reference is used in Git to specify branches and tags.  A
 470 branch head is stored in the <code>refs/heads</code> hierarchy, while
 471 a tag is stored in the <code>refs/tags</code> hierarchy of the ref namespace
 472 (typically in <code>$GIT_DIR/refs/heads</code> and <code>$GIT_DIR/refs/tags</code>
 473 directories or, as entries in file <code>$GIT_DIR/packed-refs</code>
 474 if refs are packed by <code>git gc</code>).</p>
 475 </div>
 476 <div class="paragraph">
 477 <p>Git imposes the following rules on how references are named:</p>
 478 </div>
 479 <div class="olist arabic">
 480 <ol class="arabic">
 481 <li>
 482 <p>They can include slash <code>/</code> for hierarchical (directory)
 483 grouping, but no slash-separated component can begin with a
 484 dot <code>.</code> or end with the sequence <code>.lock</code>.</p>
 485 </li>
 486 <li>
 487 <p>They must contain at least one <code>/</code>. This enforces the presence of a
 488 category like <code>heads/</code>, <code>tags/</code> etc. but the actual names are not
 489 restricted.  If the <code>--allow-onelevel</code> option is used, this rule
 490 is waived.</p>
 491 </li>
 492 <li>
 493 <p>They cannot have two consecutive dots <code>..</code> anywhere.</p>
 494 </li>
 495 <li>
 496 <p>They cannot have ASCII control characters (i.e. bytes whose
 497 values are lower than \040, or \177 <code>DEL</code>), space, tilde <code>~</code>,
 498 caret <code>^</code>, or colon <code>:</code> anywhere.</p>
 499 </li>
 500 <li>
 501 <p>They cannot have question-mark <code>?</code>, asterisk <code>*</code>, or open
 502 bracket <code>[</code> anywhere.  See the <code>--refspec-pattern</code> option below for
 503 an exception to this rule.</p>
 504 </li>
 505 <li>
 506 <p>They cannot begin or end with a slash <code>/</code> or contain multiple
 507 consecutive slashes (see the <code>--normalize</code> option below for an
 508 exception to this rule).</p>
 509 </li>
 510 <li>
 511 <p>They cannot end with a dot <code>.</code>.</p>
 512 </li>
 513 <li>
 514 <p>They cannot contain a sequence <code>@{</code>.</p>
 515 </li>
 516 <li>
 517 <p>They cannot be the single character <code>@</code>.</p>
 518 </li>
 519 <li>
 520 <p>They cannot contain a <code>\</code>.</p>
 521 </li>
 522 </ol>
 523 </div>
 524 <div class="paragraph">
 525 <p>These rules make it easy for shell script based tools to parse
 526 reference names, pathname expansion by the shell when a reference name is used
 527 unquoted (by mistake), and also avoid ambiguities in certain
 528 reference name expressions (see <a href="gitrevisions.html">gitrevisions(7)</a>):</p>
 529 </div>
 530 <div class="olist arabic">
 531 <ol class="arabic">
 532 <li>
 533 <p>A double-dot <code>..</code> is often used as in <code>ref1..ref2</code>, and in some
 534 contexts this notation means <code>^ref1 ref2</code> (i.e. not in
 535 <code>ref1</code> and in <code>ref2</code>).</p>
 536 </li>
 537 <li>
 538 <p>A tilde <code>~</code> and caret <code>^</code> are used to introduce the postfix
 539 <em>nth parent</em> and <em>peel onion</em> operation.</p>
 540 </li>
 541 <li>
 542 <p>A colon <code>:</code> is used as in <code>srcref:dstref</code> to mean "use srcref&#8217;s
 543 value and store it in dstref" in fetch and push operations.
 544 It may also be used to select a specific object such as with
 545 'git cat-file': "git cat-file blob v1.3.3:refs.c".</p>
 546 </li>
 547 <li>
 548 <p>at-open-brace <code>@{</code> is used as a notation to access a reflog entry.</p>
 549 </li>
 550 </ol>
 551 </div>
 552 <div class="paragraph">
 553 <p>With the <code>--branch</code> option, the command takes a name and checks if
 554 it can be used as a valid branch name (e.g. when creating a new
 555 branch). But be cautious when using the
 556 previous checkout syntax that may refer to a detached HEAD state.
 557 The rule <code>git check-ref-format --branch $name</code> implements
 558 may be stricter than what <code>git check-ref-format refs/heads/$name</code>
 559 says (e.g. a dash may appear at the beginning of a ref component,
 560 but it is explicitly forbidden at the beginning of a branch name).
 561 When run with the <code>--branch</code> option in a repository, the input is first
 562 expanded for the &#8220;previous checkout syntax&#8221;
 563 <code>@{-n}</code>.  For example, <code>@{-1}</code> is a way to refer the last thing that
 564 was checked out using "git switch" or "git checkout" operation.
 565 This option should be
 566 used by porcelains to accept this syntax anywhere a branch name is
 567 expected, so they can act as if you typed the branch name. As an
 568 exception note that, the &#8220;previous checkout operation&#8221; might result
 569 in a commit object name when the N-th last thing checked out was not
 570 a branch.</p>
 571 </div>
 572 </div>
 573 </div>
 574 <div class="sect1">
 575 <h2 id="_options">OPTIONS</h2>
 576 <div class="sectionbody">
 577 <div class="dlist">
 578 <dl>
 579 <dt class="hdlist1">--[no-]allow-onelevel</dt>
 580 <dd>
 581 <p>Controls whether one-level refnames are accepted (i.e.,
 582 refnames that do not contain multiple <code>/</code>-separated
 583 components).  The default is <code>--no-allow-onelevel</code>.</p>
 584 </dd>
 585 <dt class="hdlist1">--refspec-pattern</dt>
 586 <dd>
 587 <p>Interpret &lt;refname&gt; as a reference name pattern for a refspec
 588 (as used with remote repositories).  If this option is
 589 enabled, &lt;refname&gt; is allowed to contain a single <code>*</code>
 590 in the refspec (e.g., <code>foo/bar*/baz</code> or <code>foo/bar*baz/</code>
 591 but not <code>foo/bar*/baz*</code>).</p>
 592 </dd>
 593 <dt class="hdlist1">--normalize</dt>
 594 <dd>
 595 <p>Normalize <em>refname</em> by removing any leading slash (<code>/</code>)
 596 characters and collapsing runs of adjacent slashes between
 597 name components into a single slash.  If the normalized
 598 refname is valid then print it to standard output and exit
 599 with a status of 0, otherwise exit with a non-zero status.
 600 (<code>--print</code> is a deprecated way to spell <code>--normalize</code>.)</p>
 601 </dd>
 602 </dl>
 603 </div>
 604 </div>
 605 </div>
 606 <div class="sect1">
 607 <h2 id="_examples">EXAMPLES</h2>
 608 <div class="sectionbody">
 609 <div class="ulist">
 610 <ul>
 611 <li>
 612 <p>Print the name of the previous thing checked out:</p>
 613 <div class="listingblock">
 614 <div class="content">
 615 <pre>$ git check-ref-format --branch @{-1}</pre>
 616 </div>
 617 </div>
 618 </li>
 619 <li>
 620 <p>Determine the reference name to use for a new branch:</p>
 621 <div class="listingblock">
 622 <div class="content">
 623 <pre>$ ref=$(git check-ref-format --normalize "refs/heads/$newbranch")||
 624 { echo "we do not like '$newbranch' as a branch name." &gt;&amp;2 ; exit 1 ; }</pre>
 625 </div>
 626 </div>
 627 </li>
 628 </ul>
 629 </div>
 630 </div>
 631 </div>
 632 <div class="sect1">
 633 <h2 id="_git">GIT</h2>
 634 <div class="sectionbody">
 635 <div class="paragraph">
 636 <p>Part of the <a href="git.html">git(1)</a> suite</p>
 637 </div>
 638 </div>
 639 </div>
 640 </div>
 641 <div id="footer">
 642 <div id="footer-text">
 643 Last updated 2023-10-23 14:43:46 -0700
 644 </div>
 645 </div>
 646 </body>
 647 </html>