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<body class="manpage">
<div id="header">
<h1>
git-multi-pack-index(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>git-multi-pack-index -
Write and verify multi-pack-indexes
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>git multi-pack-index</em> [--object-dir=<dir>] [--[no-]bitmap] <sub-command></pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Write or verify a multi-pack-index (MIDX) file.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
--object-dir=<dir>
</dt>
<dd>
<p>
Use given directory for the location of Git objects. We check
<em><dir></em><code>/packs/multi-pack-index</code> for the current MIDX file, and
<em><dir></em><code>/packs</code> for the pack-files to index.
</p>
<div class="paragraph"><p><em><dir></em> must be an alternate of the current repository.</p></div>
</dd>
<dt class="hdlist1">
--progress
</dt>
<dt class="hdlist1">
--no-progress
</dt>
<dd>
<p>
Turn progress on/off explicitly. If neither is specified, progress is
shown if standard error is connected to a terminal. Supported by
sub-commands <code>write</code>, <code>verify</code>, <code>expire</code>, and <code>repack</code>.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>The following subcommands are available:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
write
</dt>
<dd>
<p>
Write a new MIDX file. The following options are available for
the <code>write</code> sub-command:
</p>
<div class="openblock">
<div class="content">
<div class="dlist"><dl>
<dt class="hdlist1">
--preferred-pack=<pack>
</dt>
<dd>
<p>
When specified, break ties in favor of this pack when
there are additional copies of its objects in other
packs. Ties for objects not found in the preferred
pack are always resolved in favor of the copy in the
pack with the highest mtime. If unspecified, the pack
with the lowest mtime is used by default. The
preferred pack must have at least one object.
</p>
</dd>
<dt class="hdlist1">
--[no-]bitmap
</dt>
<dd>
<p>
Control whether or not a multi-pack bitmap is written.
</p>
</dd>
<dt class="hdlist1">
--stdin-packs
</dt>
<dd>
<p>
Write a multi-pack index containing only the set of
line-delimited pack index basenames provided over stdin.
</p>
</dd>
<dt class="hdlist1">
--refs-snapshot=<path>
</dt>
<dd>
<p>
With <code>--bitmap</code>, optionally specify a file which
contains a "refs snapshot" taken prior to repacking.
</p>
<div class="paragraph"><p>A reference snapshot is composed of line-delimited OIDs corresponding to
the reference tips, usually taken by <code>git</code> <code>repack</code> prior to generating a
new pack. A line may optionally start with a <code>+</code> character to indicate
that the reference which corresponds to that OID is "preferred" (see
<a href="git-config.html">git-config(1)</a>'s <code>pack.preferBitmapTips</code>.)</p></div>
<div class="paragraph"><p>The file given at <em><path></em> is expected to be readable, and can contain
duplicates. (If a given OID is given more than once, it is marked as
preferred if at least one instance of it begins with the special <code>+</code>
marker).</p></div>
</dd>
<dt class="hdlist1">
--incremental
</dt>
<dd>
<p>
Write an incremental MIDX file containing only objects
and packs not present in an existing MIDX layer.
Migrates non-incremental MIDXs to incremental ones when
necessary. Incompatible with <code>--bitmap</code>.
</p>
</dd>
</dl></div>
</div></div>
</dd>
<dt class="hdlist1">
verify
</dt>
<dd>
<p>
Verify the contents of the MIDX file.
</p>
</dd>
<dt class="hdlist1">
expire
</dt>
<dd>
<p>
Delete the pack-files that are tracked by the MIDX file, but
have no objects referenced by the MIDX (with the exception of
<code>.keep</code> packs and cruft packs). Rewrite the MIDX file afterward
to remove all references to these pack-files.
</p>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">this mode is incompatible with incremental MIDX files.</td>
</tr></table>
</div>
</dd>
<dt class="hdlist1">
repack
</dt>
<dd>
<p>
Create a new pack-file containing objects in small pack-files
referenced by the multi-pack-index. If the size given by the
<code>--batch-size=</code><em><size></em> argument is zero, then create a pack
containing all objects referenced by the multi-pack-index. For
a non-zero batch size, Select the pack-files by examining packs
from oldest-to-newest, computing the "expected size" by counting
the number of objects in the pack referenced by the
multi-pack-index, then divide by the total number of objects in
the pack and multiply by the pack size. We select packs with
expected size below the batch size until the set of packs have
total expected size at least the batch size, or all pack-files
are considered. If only one pack-file is selected, then do
nothing. If a new pack-file is created, rewrite the
multi-pack-index to reference the new pack-file. A later run of
<em>git multi-pack-index expire</em> will delete the pack-files that
were part of this batch.
</p>
<div class="paragraph"><p>If <code>repack.packKeptObjects</code> is <code>false</code>, then any pack-files with an
associated <code>.keep</code> file will not be selected for the batch to repack.</p></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">this mode is incompatible with incremental MIDX files.</td>
</tr></table>
</div>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Write a MIDX file for the packfiles in the current <code>.git</code> directory.
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git multi-pack-index write</code></pre>
</div></div>
</li>
<li>
<p>
Write a MIDX file for the packfiles in the current <code>.git</code> directory with a
corresponding bitmap.
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git multi-pack-index write --preferred-pack=<pack> --bitmap</code></pre>
</div></div>
</li>
<li>
<p>
Write a MIDX file for the packfiles in an alternate object store.
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git multi-pack-index --object-dir <alt> write</code></pre>
</div></div>
</li>
<li>
<p>
Verify the MIDX file for the packfiles in the current <code>.git</code> directory.
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git multi-pack-index verify</code></pre>
</div></div>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph"><p>See <a href="technical/multi-pack-index.html">The Multi-Pack-Index Design
Document</a> and <a href="gitformat-pack.html">gitformat-pack(5)</a> for more information on the
multi-pack-index feature and its file format.</p></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
2025-11-17 16:38:17 UTC
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