FM / technical

/usr/share/doc/git/technical

Name	Size	Mode	Actions
api-error-handling.html	22259	0644	edit dl rm
api-error-handling.txt	3818	0644	edit dl rm
api-index-skel.txt	432	0644	edit dl rm
api-index.html	17183	0644	edit dl rm
api-index.sh	611	0644	edit dl rm
api-index.txt	648	0644	edit dl rm
api-merge.html	18305	0644	edit dl rm
api-merge.txt	1090	0644	edit dl rm
api-parse-options.html	36657	0644	edit dl rm
api-parse-options.txt	13157	0644	edit dl rm
api-simple-ipc.html	22388	0644	edit dl rm
api-simple-ipc.txt	4852	0644	edit dl rm
api-trace2.html	77619	0644	edit dl rm
api-trace2.txt	44255	0644	edit dl rm
bitmap-format.html	30403	0644	edit dl rm
bitmap-format.txt	8871	0644	edit dl rm
bundle-uri.html	51387	0644	edit dl rm
bundle-uri.txt	26787	0644	edit dl rm
commit-graph.txt	17957	0644	edit dl rm
directory-rename-detection.txt	5199	0644	edit dl rm
hash-function-transition.html	64539	0644	edit dl rm
hash-function-transition.txt	35894	0644	edit dl rm
long-running-process-protocol.html	18995	0644	edit dl rm
long-running-process-protocol.txt	1929	0644	edit dl rm
multi-pack-index.html	22462	0644	edit dl rm
multi-pack-index.txt	4459	0644	edit dl rm
pack-heuristics.html	43594	0644	edit dl rm
pack-heuristics.txt	18040	0644	edit dl rm
packfile-uri.txt	3748	0644	edit dl rm
parallel-checkout.html	31715	0644	edit dl rm
parallel-checkout.txt	12301	0644	edit dl rm
partial-clone.html	36496	0644	edit dl rm
partial-clone.txt	14968	0644	edit dl rm
racy-git.html	27995	0644	edit dl rm
racy-git.txt	9121	0644	edit dl rm
reftable.html	73792	0644	edit dl rm
reftable.txt	37525	0644	edit dl rm
remembering-renames.txt	30360	0644	edit dl rm
repository-version.txt	4311	0644	edit dl rm
rerere.txt	6510	0644	edit dl rm
scalar.html	20458	0644	edit dl rm
scalar.txt	2935	0644	edit dl rm
send-pack-pipeline.html	19315	0644	edit dl rm
send-pack-pipeline.txt	1969	0644	edit dl rm
shallow.html	19685	0644	edit dl rm
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sparse-checkout.txt	47499	0644	edit dl rm
sparse-index.txt	9501	0644	edit dl rm
trivial-merge.html	22273	0644	edit dl rm
trivial-merge.txt	4264	0644	edit dl rm

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<div id="header">
<h1>Scalar</h1>
<span id="revdate"></span>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Scalar is a repository management tool that optimizes Git for use in large
repositories. It accomplishes this by helping users to take advantage of
advanced performance features in Git. Unlike most other Git built-in commands,
Scalar is not executed as a subcommand of <em>git</em>; rather, it is built as a
separate executable containing its own series of subcommands.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_background">Background</h2>
<div class="sectionbody">
<div class="paragraph"><p>Scalar was originally designed as an add-on to Git and implemented as a .NET
Core application. It was created based on the learnings from the VFS for Git
project (another application aimed at improving the experience of working with
large repositories). As part of its initial implementation, Scalar relied on
custom features in the Microsoft fork of Git that have since been integrated
into core Git:</p></div>
<div class="ulist"><ul>
<li>
<p>
partial clone,
</p>
</li>
<li>
<p>
commit graphs,
</p>
</li>
<li>
<p>
multi-pack index,
</p>
</li>
<li>
<p>
sparse checkout (cone mode),
</p>
</li>
<li>
<p>
scheduled background maintenance,
</p>
</li>
<li>
<p>
etc
</p>
</li>
</ul></div>
<div class="paragraph"><p>With the requisite Git functionality in place and a desire to bring the benefits
of Scalar to the larger Git community, the Scalar application itself was ported
from C# to C and integrated upstream.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_features">Features</h2>
<div class="sectionbody">
<div class="paragraph"><p>Scalar is comprised of two major pieces of functionality: automatically
configuring built-in Git performance features and managing repository
enlistments.</p></div>
<div class="paragraph"><p>The Git performance features configured by Scalar (see "Background" for
examples) confer substantial performance benefits to large repositories, but are
either too experimental to enable for all of Git yet, or only benefit large
repositories. As new features are introduced, Scalar should be updated
accordingly to incorporate them. This will prevent the tool from becoming stale
while also providing a path for more easily bringing features to the appropriate
users.</p></div>
<div class="paragraph"><p>Enlistments are how Scalar knows which repositories on a user&#8217;s system should
utilize Scalar-configured features. This allows it to update performance
settings when new ones are added to the tool, as well as centrally manage
repository maintenance. The enlistment structure - a root directory with a
<code>src/</code> subdirectory containing the cloned repository itself - is designed to
encourage users to route build outputs outside of the repository to avoid the
performance-limiting overhead of ignoring those files in Git.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_design">Design</h2>
<div class="sectionbody">
<div class="paragraph"><p>Scalar is implemented in C and interacts with Git via a mix of child process
invocations of Git and direct usage of <code>libgit.a</code>. Internally, it is structured
much like other built-ins with subcommands (e.g., <code>git stash</code>), containing a
<code>cmd_&lt;subcommand&gt;()</code> function for each subcommand, routed through a <code>cmd_main()</code>
function. Most options are unique to each subcommand, with <code>scalar</code> respecting
some "global" <code>git</code> options (e.g., <code>-c</code> and <code>-C</code>).</p></div>
<div class="paragraph"><p>Because <code>scalar</code> is not invoked as a Git subcommand (like <code>git scalar</code>), it is
built and installed as its own executable in the <code>bin/</code> directory, alongside
<code>git</code>, <code>git-gui</code>, etc.</p></div>
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Last updated
 2025-06-13 22:14:31 UTC
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