gitformat-bundle.html - pub/scm/git/git-htmldocs - Git at Google

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 <body class="manpage">
 <div id="header">
 <h1>
 gitformat-bundle(5) Manual Page
 </h1>
 <h2>NAME</h2>
 <div class="sectionbody">
 <p>gitformat-bundle -
    The bundle file format
 </p>
 </div>
 </div>
 <div id="content">
 <div class="sect1">
 <h2 id="_synopsis">SYNOPSIS</h2>
 <div class="sectionbody">
 <div class="verseblock">
 <pre class="content">*.bundle
 *.bdl</pre>
 <div class="attribution">
 </div></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_description">DESCRIPTION</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>The Git bundle format is a format that represents both refs and Git
 objects. A bundle is a header in a format similar to
 <a href="git-show-ref.html">git-show-ref(1)</a> followed by a pack in *.pack format.</p></div>
 <div class="paragraph"><p>The format is created and read by the <a href="git-bundle.html">git-bundle(1)</a> command,
 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></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_format">FORMAT</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>We will use ABNF notation to define the Git bundle format. See
 <a href="gitprotocol-common.html">gitprotocol-common(5)</a> for the details.</p></div>
 <div class="paragraph"><p>A v2 bundle looks like this:</p></div>
 <div class="listingblock">
 <div class="content">
 <pre><code>bundle    = signature *prerequisite *reference LF pack
 signature = "# v2 git bundle" LF

 prerequisite = "-" obj-id SP comment LF
 comment      = *CHAR
 reference    = obj-id SP refname LF

 pack         = ... ; packfile</code></pre>
 </div></div>
 <div class="paragraph"><p>A v3 bundle looks like this:</p></div>
 <div class="listingblock">
 <div class="content">
 <pre><code>bundle    = signature *capability *prerequisite *reference LF pack
 signature = "# v3 git bundle" LF

 capability   = "@" key ["=" value] LF
 prerequisite = "-" obj-id SP comment LF
 comment      = *CHAR
 reference    = obj-id SP refname LF
 key          = 1*(ALPHA / DIGIT / "-")
 value        = *(%01-09 / %0b-FF)

 pack         = ... ; packfile</code></pre>
 </div></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_semantics">SEMANTICS</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>A Git bundle consists of several parts.</p></div>
 <div class="ulist"><ul>
 <li>
 <p>
 "Capabilities", which are only in the v3 format, indicate functionality that
         the bundle requires to be read properly.
 </p>
 </li>
 <li>
 <p>
 "Prerequisites" list the objects that are NOT included in the bundle and the
   reader of the bundle MUST already have, in order to use the data in the
   bundle. The objects stored in the bundle may refer to prerequisite objects and
   anything reachable from them (e.g. a tree object in the bundle can reference
   a blob that is reachable from a prerequisite) and/or expressed as a delta
   against prerequisite objects.
 </p>
 </li>
 <li>
 <p>
 "References" record the tips of the history graph, iow, what the reader of the
   bundle CAN "git fetch" from it.
 </p>
 </li>
 <li>
 <p>
 "Pack" is the pack data stream "git fetch" would send, if you fetch from a
   repository that has the references recorded in the "References" above into a
   repository that has references pointing at the objects listed in
   "Prerequisites" above.
 </p>
 </li>
 </ul></div>
 <div class="paragraph"><p>In the bundle format, there can be a comment following a prerequisite obj-id.
 This is a comment and it has no specific meaning. The writer of the bundle MAY
 put any string here. The reader of the bundle MUST ignore the comment.</p></div>
 <div class="sect2">
 <h3 id="_note_on_shallow_clones_and_git_bundles">Note on shallow clones and Git bundles</h3>
 <div class="paragraph"><p>Note that the prerequisites do not represent a shallow-clone boundary. The
 semantics of the prerequisites and the shallow-clone boundaries are different,
 and the Git bundle v2 format cannot represent a shallow clone repository.</p></div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_capabilities">CAPABILITIES</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>Because there is no opportunity for negotiation, unknown capabilities cause <em>git
 bundle</em> to abort.</p></div>
 <div class="ulist"><ul>
 <li>
 <p>
 <code>object-format</code> specifies the hash algorithm in use, and can take the same
   values as the <code>extensions.objectFormat</code> configuration value.
 </p>
 </li>
 <li>
 <p>
 <code>filter</code> specifies an object filter as in the <code>--filter</code> option in
   <a href="git-rev-list.html">git-rev-list(1)</a>. The resulting pack-file must be marked as a
   <code>.promisor</code> pack-file after it is unbundled.
 </p>
 </li>
 </ul></div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_git">GIT</h2>
 <div class="sectionbody">
 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
 </div>
 </div>
 </div>
 <div id="footnotes"><hr /></div>
 <div id="footer">
 <div id="footer-text">
 Last updated
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	<body class="manpage">
	<div id="header">
	<h1>
	gitformat-bundle(5) Manual Page
	</h1>
	<h2>NAME</h2>
	<div class="sectionbody">
	<p>gitformat-bundle -
	The bundle file format
	</p>
	</div>
	</div>
	<div id="content">
	<div class="sect1">
	<h2 id="_synopsis">SYNOPSIS</h2>
	<div class="sectionbody">
	<div class="verseblock">
	<pre class="content">*.bundle
	*.bdl</pre>
	<div class="attribution">
	</div></div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_description">DESCRIPTION</h2>
	<div class="sectionbody">
	<div class="paragraph"><p>The Git bundle format is a format that represents both refs and Git
	objects. A bundle is a header in a format similar to
	<a href="git-show-ref.html">git-show-ref(1)</a> followed by a pack in *.pack format.</p></div>
	<div class="paragraph"><p>The format is created and read by the <a href="git-bundle.html">git-bundle(1)</a> command,
	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></div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_format">FORMAT</h2>
	<div class="sectionbody">
	<div class="paragraph"><p>We will use ABNF notation to define the Git bundle format. See
	<a href="gitprotocol-common.html">gitprotocol-common(5)</a> for the details.</p></div>
	<div class="paragraph"><p>A v2 bundle looks like this:</p></div>
	<div class="listingblock">
	<div class="content">
	<pre><code>bundle = signature prerequisite reference LF pack
	signature = "# v2 git bundle" LF

	prerequisite = "-" obj-id SP comment LF
	comment = *CHAR
	reference = obj-id SP refname LF

	pack = ... ; packfile</code></pre>
	</div></div>
	<div class="paragraph"><p>A v3 bundle looks like this:</p></div>
	<div class="listingblock">
	<div class="content">
	<pre><code>bundle = signature capability prerequisite *reference LF pack
	signature = "# v3 git bundle" LF

	capability = "@" key ["=" value] LF
	prerequisite = "-" obj-id SP comment LF
	comment = *CHAR
	reference = obj-id SP refname LF
	key = 1*(ALPHA / DIGIT / "-")
	value = *(%01-09 / %0b-FF)

	pack = ... ; packfile</code></pre>
	</div></div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_semantics">SEMANTICS</h2>
	<div class="sectionbody">
	<div class="paragraph"><p>A Git bundle consists of several parts.</p></div>
	<div class="ulist"><ul>
	<li>
	<p>
	"Capabilities", which are only in the v3 format, indicate functionality that
	the bundle requires to be read properly.
	</p>
	</li>
	<li>
	<p>
	"Prerequisites" list the objects that are NOT included in the bundle and the
	reader of the bundle MUST already have, in order to use the data in the
	bundle. The objects stored in the bundle may refer to prerequisite objects and
	anything reachable from them (e.g. a tree object in the bundle can reference
	a blob that is reachable from a prerequisite) and/or expressed as a delta
	against prerequisite objects.
	</p>
	</li>
	<li>
	<p>
	"References" record the tips of the history graph, iow, what the reader of the
	bundle CAN "git fetch" from it.
	</p>
	</li>
	<li>
	<p>
	"Pack" is the pack data stream "git fetch" would send, if you fetch from a
	repository that has the references recorded in the "References" above into a
	repository that has references pointing at the objects listed in
	"Prerequisites" above.
	</p>
	</li>
	</ul></div>
	<div class="paragraph"><p>In the bundle format, there can be a comment following a prerequisite obj-id.
	This is a comment and it has no specific meaning. The writer of the bundle MAY
	put any string here. The reader of the bundle MUST ignore the comment.</p></div>
	<div class="sect2">
	<h3 id="_note_on_shallow_clones_and_git_bundles">Note on shallow clones and Git bundles</h3>
	<div class="paragraph"><p>Note that the prerequisites do not represent a shallow-clone boundary. The
	semantics of the prerequisites and the shallow-clone boundaries are different,
	and the Git bundle v2 format cannot represent a shallow clone repository.</p></div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_capabilities">CAPABILITIES</h2>
	<div class="sectionbody">
	<div class="paragraph"><p>Because there is no opportunity for negotiation, unknown capabilities cause <em>git
	bundle</em> to abort.</p></div>
	<div class="ulist"><ul>
	<li>
	<p>
	<code>object-format</code> specifies the hash algorithm in use, and can take the same
	values as the <code>extensions.objectFormat</code> configuration value.
	</p>
	</li>
	<li>
	<p>
	<code>filter</code> specifies an object filter as in the <code>--filter</code> option in
	<a href="git-rev-list.html">git-rev-list(1)</a>. The resulting pack-file must be marked as a
	<code>.promisor</code> pack-file after it is unbundled.
	</p>
	</li>
	</ul></div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_git">GIT</h2>
	<div class="sectionbody">
	<div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
	</div>
	</div>
	</div>
	<div id="footnotes"><hr /></div>
	<div id="footer">
	<div id="footer-text">
	Last updated
	2023-10-23 14:43:46 PDT
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