523 lines
33 KiB
HTML
523 lines
33 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 1.5.8">
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<title>Shallow commits</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
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<style>
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/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
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</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>Shallow commits</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div class="sidebarblock">
|
|
<div class="content">
|
|
<div class="title">Definition</div>
|
|
<div class="paragraph">
|
|
<p>Shallow commits do have parents, but not in the shallow
|
|
repo, and therefore grafts are introduced pretending that
|
|
these commits have no parents.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>$GIT_DIR/shallow lists commit object names and tells Git to
|
|
pretend as if they are root commits (e.g. "git log" traversal
|
|
stops after showing them; "git fsck" does not complain saying
|
|
the commits listed on their "parent" lines do not exist).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Each line contains exactly one SHA-1. When read, a commit_graft
|
|
will be constructed, which has nr_parent < 0 to make it easier
|
|
to discern from user provided grafts.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Note that the shallow feature could not be changed easily to
|
|
use replace refs: a commit containing a <code>mergetag</code> is not allowed
|
|
to be replaced, not even by a root commit. Such a commit can be
|
|
made shallow, though. Also, having a <code>shallow</code> file explicitly
|
|
listing all the commits made shallow makes it a <strong>lot</strong> easier to
|
|
do shallow-specific things such as to deepen the history.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Since fsck-objects relies on the library to read the objects,
|
|
it honours shallow commits automatically.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>There are some unfinished ends of the whole shallow business:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>maybe we have to force non-thin packs when fetching into a
|
|
shallow repo (ATM they are forced non-thin).</p>
|
|
</li>
|
|
<li>
|
|
<p>A special handling of a shallow upstream is needed. At some
|
|
stage, upload-pack has to check if it sends a shallow commit,
|
|
and it should send that information early (or fail, if the
|
|
client does not support shallow repositories). There is no
|
|
support at all for this in this patch series.</p>
|
|
</li>
|
|
<li>
|
|
<p>Instead of locking $GIT_DIR/shallow at the start, just
|
|
the timestamp of it is noted, and when it comes to writing it,
|
|
a check is performed if the mtime is still the same, dying if
|
|
it is not.</p>
|
|
</li>
|
|
<li>
|
|
<p>It is unclear how "push into/from a shallow repo" should behave.</p>
|
|
</li>
|
|
<li>
|
|
<p>If you deepen a history, you’d want to get the tags of the
|
|
newly stored (but older!) commits. This does not work right now.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>To make a shallow clone, you can call "git-clone --depth 20 repo".
|
|
The result contains only commit chains with a length of at most 20.
|
|
It also writes an appropriate $GIT_DIR/shallow.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You can deepen a shallow repository with "git-fetch --depth 20
|
|
repo branch", which will fetch branch from repo, but stop at depth
|
|
20, updating $GIT_DIR/shallow.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The special depth 2147483647 (or 0x7fffffff, the largest positive
|
|
number a signed 32-bit integer can contain) means infinite depth.</p>
|
|
</div>
|
|
</div>
|
|
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Last updated 2019-02-26 19:31:11 UTC
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