gitformat-bundle.html

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   8 <title>gitformat-bundle(5)</title>
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 441 <body class="manpage">
 442 <div id="header">
 443 <h1>gitformat-bundle(5) Manual Page</h1>
 444 <h2 id="_name">NAME</h2>
 445 <div class="sectionbody">
 446 <p>gitformat-bundle - The bundle file format</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">*.bundle
 455 *.bdl</pre>
 456 </div>
 457 </div>
 458 </div>
 459 <div class="sect1">
 460 <h2 id="_description">DESCRIPTION</h2>
 461 <div class="sectionbody">
 462 <div class="paragraph">
 463 <p>The Git bundle format is a format that represents both refs and Git
 464 objects. A bundle is a header in a format similar to
 465 <a href="git-show-ref.html">git-show-ref(1)</a> followed by a pack in *.pack format.</p>
 466 </div>
 467 <div class="paragraph">
 468 <p>The format is created and read by the <a href="git-bundle.html">git-bundle(1)</a> command,
 469 and supported by e.g. <a href="git-fetch.html">git-fetch(1)</a> and <a href="git-clone.html">git-clone(1)</a>.</p>
 470 </div>
 471 </div>
 472 </div>
 473 <div class="sect1">
 474 <h2 id="_format">FORMAT</h2>
 475 <div class="sectionbody">
 476 <div class="paragraph">
 477 <p>We will use ABNF notation to define the Git bundle format. See
 478 <a href="gitprotocol-common.html">gitprotocol-common(5)</a> for the details.</p>
 479 </div>
 480 <div class="paragraph">
 481 <p>A v2 bundle looks like this:</p>
 482 </div>
 483 <div class="listingblock">
 484 <div class="content">
 485 <pre>bundle    = signature *prerequisite *reference LF pack
 486 signature = "# v2 git bundle" LF
 487
 488 prerequisite = "-" obj-id SP comment LF
 489 comment      = *CHAR
 490 reference    = obj-id SP refname LF
 491
 492 pack         = ... ; packfile</pre>
 493 </div>
 494 </div>
 495 <div class="paragraph">
 496 <p>A v3 bundle looks like this:</p>
 497 </div>
 498 <div class="listingblock">
 499 <div class="content">
 500 <pre>bundle    = signature *capability *prerequisite *reference LF pack
 501 signature = "# v3 git bundle" LF
 502
 503 capability   = "@" key ["=" value] LF
 504 prerequisite = "-" obj-id SP comment LF
 505 comment      = *CHAR
 506 reference    = obj-id SP refname LF
 507 key          = 1*(ALPHA / DIGIT / "-")
 508 value        = *(%01-09 / %0b-FF)
 509
 510 pack         = ... ; packfile</pre>
 511 </div>
 512 </div>
 513 </div>
 514 </div>
 515 <div class="sect1">
 516 <h2 id="_semantics">SEMANTICS</h2>
 517 <div class="sectionbody">
 518 <div class="paragraph">
 519 <p>A Git bundle consists of several parts.</p>
 520 </div>
 521 <div class="ulist">
 522 <ul>
 523 <li>
 524 <p>"Capabilities", which are only in the v3 format, indicate functionality that
 525 the bundle requires to be read properly.</p>
 526 </li>
 527 <li>
 528 <p>"Prerequisites" list the objects that are NOT included in the bundle and the
 529 reader of the bundle MUST already have, in order to use the data in the
 530 bundle. The objects stored in the bundle may refer to prerequisite objects and
 531 anything reachable from them (e.g. a tree object in the bundle can reference
 532 a blob that is reachable from a prerequisite) and/or expressed as a delta
 533 against prerequisite objects.</p>
 534 </li>
 535 <li>
 536 <p>"References" record the tips of the history graph, iow, what the reader of the
 537 bundle CAN "git fetch" from it.</p>
 538 </li>
 539 <li>
 540 <p>"Pack" is the pack data stream "git fetch" would send, if you fetch from a
 541 repository that has the references recorded in the "References" above into a
 542 repository that has references pointing at the objects listed in
 543 "Prerequisites" above.</p>
 544 </li>
 545 </ul>
 546 </div>
 547 <div class="paragraph">
 548 <p>In the bundle format, there can be a comment following a prerequisite obj-id.
 549 This is a comment and it has no specific meaning. The writer of the bundle MAY
 550 put any string here. The reader of the bundle MUST ignore the comment.</p>
 551 </div>
 552 <div class="sect2">
 553 <h3 id="_note_on_shallow_clones_and_git_bundles">Note on shallow clones and Git bundles</h3>
 554 <div class="paragraph">
 555 <p>Note that the prerequisites do not represent a shallow-clone boundary. The
 556 semantics of the prerequisites and the shallow-clone boundaries are different,
 557 and the Git bundle v2 format cannot represent a shallow clone repository.</p>
 558 </div>
 559 </div>
 560 </div>
 561 </div>
 562 <div class="sect1">
 563 <h2 id="_capabilities">CAPABILITIES</h2>
 564 <div class="sectionbody">
 565 <div class="paragraph">
 566 <p>Because there is no opportunity for negotiation, unknown capabilities cause <em>git
 567 bundle</em> to abort.</p>
 568 </div>
 569 <div class="ulist">
 570 <ul>
 571 <li>
 572 <p><code>object-format</code> specifies the hash algorithm in use, and can take the same
 573 values as the <code>extensions.objectFormat</code> configuration value.</p>
 574 </li>
 575 <li>
 576 <p><code>filter</code> specifies an object filter as in the <code>--filter</code> option in
 577 <a href="git-rev-list.html">git-rev-list(1)</a>. The resulting pack-file must be marked as a
 578 .<code>promisor</code> pack-file after it is unbundled.</p>
 579 </li>
 580 </ul>
 581 </div>
 582 </div>
 583 </div>
 584 <div class="sect1">
 585 <h2 id="_git">GIT</h2>
 586 <div class="sectionbody">
 587 <div class="paragraph">
 588 <p>Part of the <a href="git.html">git(1)</a> suite</p>
 589 </div>
 590 </div>
 591 </div>
 592 </div>
 593 <div id="footer">
 594 <div id="footer-text">
 595 Last updated 2023-10-23 14:43:46 -0700
 596 </div>
 597 </div>
 598 </body>
 599 </html>