1086 lines
28 KiB
HTML
1086 lines
28 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 10.2.0" />
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<title>gitformat-commit-graph(5)</title>
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<style type="text/css">
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/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Default font. */
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body {
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font-family: Georgia,serif;
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}
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/* Title font. */
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h1, h2, h3, h4, h5, h6,
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div.title, caption.title,
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thead, p.table.header,
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#toctitle,
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#author, #revnumber, #revdate, #revremark,
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#footer {
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font-family: Arial,Helvetica,sans-serif;
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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h5 {
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font-size: 1.0em;
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}
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div.sectionbody {
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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ul > li { color: #aaa; }
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ul > li > * { color: black; }
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.monospaced, code, pre {
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font-family: "Courier New", Courier, monospace;
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font-size: inherit;
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color: navy;
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padding: 0;
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margin: 0;
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}
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pre {
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white-space: pre-wrap;
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}
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#author {
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color: #527bbd;
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font-weight: bold;
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font-size: 1.1em;
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}
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#email {
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}
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#revnumber, #revdate, #revremark {
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}
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#footer {
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font-size: small;
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border-top: 2px solid silver;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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#footer-text {
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float: left;
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padding-bottom: 0.5em;
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}
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#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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}
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#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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}
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div.content { /* Block element content. */
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padding: 0;
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}
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/* Block element titles. */
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div.title, caption.title {
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color: #527bbd;
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font-weight: bold;
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text-align: left;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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}
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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margin-top: 0.0em;
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}
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div.content div.title:first-child {
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margin-top: 0.0em;
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}
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div.content + div.title {
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margin-top: 0.0em;
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}
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid #dddddd;
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border-left: 4px solid #f0f0f0;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid #dddddd;
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border-left: 5px solid #f0f0f0;
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background: #f8f8f8;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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border-left: 5px solid #f0f0f0;
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color: #888;
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}
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock > pre.content {
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font-family: inherit;
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font-size: inherit;
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}
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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div.admonitionblock .icon {
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vertical-align: top;
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font-size: 1.1em;
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font-weight: bold;
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text-decoration: underline;
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color: #527bbd;
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padding-right: 0.5em;
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}
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; vertical-align: text-bottom; }
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a.image:visited { color: white; }
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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margin-bottom: 0;
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font-style: normal;
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color: navy;
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}
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dd > *:first-child {
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margin-top: 0.1em;
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}
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ul, ol {
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list-style-position: outside;
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}
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ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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ol.upperalpha {
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list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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ol.upperroman {
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list-style-type: upper-roman;
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}
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div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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div.compact div, div.compact div {
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margin-top: 0.1em;
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margin-bottom: 0.1em;
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}
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tfoot {
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font-weight: bold;
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}
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td > div.verse {
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white-space: pre;
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}
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div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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padding-bottom: 15px;
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}
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dt.hdlist1.strong, td.hdlist1.strong {
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font-weight: bold;
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}
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td.hdlist1 {
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vertical-align: top;
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font-style: normal;
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padding-right: 0.8em;
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color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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div.colist td {
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padding-right: 0.5em;
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padding-bottom: 0.3em;
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vertical-align: top;
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}
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div.colist td img {
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margin-top: 0.3em;
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}
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@media print {
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#footer-badges { display: none; }
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}
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#toc {
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margin-bottom: 2.5em;
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}
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#toctitle {
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color: #527bbd;
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font-size: 1.1em;
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font-weight: bold;
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margin-top: 1.0em;
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margin-bottom: 0.1em;
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}
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div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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margin-top: 0;
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margin-bottom: 0;
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}
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div.toclevel2 {
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margin-left: 2em;
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font-size: 0.9em;
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}
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div.toclevel3 {
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margin-left: 4em;
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font-size: 0.9em;
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}
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div.toclevel4 {
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margin-left: 6em;
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font-size: 0.9em;
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}
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span.aqua { color: aqua; }
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span.black { color: black; }
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span.blue { color: blue; }
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span.fuchsia { color: fuchsia; }
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span.gray { color: gray; }
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span.green { color: green; }
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span.lime { color: lime; }
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span.maroon { color: maroon; }
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span.navy { color: navy; }
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span.olive { color: olive; }
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span.purple { color: purple; }
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span.red { color: red; }
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span.silver { color: silver; }
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span.teal { color: teal; }
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span.white { color: white; }
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span.yellow { color: yellow; }
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span.aqua-background { background: aqua; }
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span.black-background { background: black; }
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span.blue-background { background: blue; }
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span.fuchsia-background { background: fuchsia; }
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span.gray-background { background: gray; }
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span.green-background { background: green; }
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span.lime-background { background: lime; }
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span.maroon-background { background: maroon; }
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span.navy-background { background: navy; }
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span.olive-background { background: olive; }
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span.purple-background { background: purple; }
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span.red-background { background: red; }
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span.silver-background { background: silver; }
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span.teal-background { background: teal; }
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span.white-background { background: white; }
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span.yellow-background { background: yellow; }
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span.big { font-size: 2em; }
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span.small { font-size: 0.6em; }
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span.underline { text-decoration: underline; }
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span.overline { text-decoration: overline; }
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span.line-through { text-decoration: line-through; }
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div.unbreakable { page-break-inside: avoid; }
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/*
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* xhtml11 specific
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*
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* */
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div.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.tableblock > table {
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border: 3px solid #527bbd;
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}
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thead, p.table.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.table {
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margin-top: 0;
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}
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/* Because the table frame attribute is overridden by CSS in most browsers. */
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div.tableblock > table[frame="void"] {
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border-style: none;
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}
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div.tableblock > table[frame="hsides"] {
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border-left-style: none;
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border-right-style: none;
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}
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div.tableblock > table[frame="vsides"] {
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border-top-style: none;
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border-bottom-style: none;
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}
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/*
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* html5 specific
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*
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* */
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table.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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thead, p.tableblock.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.tableblock {
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margin-top: 0;
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}
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table.tableblock {
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border-width: 3px;
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border-spacing: 0px;
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border-style: solid;
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border-color: #527bbd;
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border-collapse: collapse;
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}
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th.tableblock, td.tableblock {
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border-width: 1px;
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padding: 4px;
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border-style: solid;
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border-color: #527bbd;
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}
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table.tableblock.frame-topbot {
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border-left-style: hidden;
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border-right-style: hidden;
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}
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table.tableblock.frame-sides {
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border-top-style: hidden;
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border-bottom-style: hidden;
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}
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|
table.tableblock.frame-none {
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|
border-style: hidden;
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}
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|
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|
th.tableblock.halign-left, td.tableblock.halign-left {
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text-align: left;
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}
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|
th.tableblock.halign-center, td.tableblock.halign-center {
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text-align: center;
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}
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|
th.tableblock.halign-right, td.tableblock.halign-right {
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text-align: right;
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}
|
|
|
|
th.tableblock.valign-top, td.tableblock.valign-top {
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|
vertical-align: top;
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|
}
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|
th.tableblock.valign-middle, td.tableblock.valign-middle {
|
|
vertical-align: middle;
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|
}
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|
th.tableblock.valign-bottom, td.tableblock.valign-bottom {
|
|
vertical-align: bottom;
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}
|
|
|
|
|
|
/*
|
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* manpage specific
|
|
*
|
|
* */
|
|
|
|
body.manpage h1 {
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padding-top: 0.5em;
|
|
padding-bottom: 0.5em;
|
|
border-top: 2px solid silver;
|
|
border-bottom: 2px solid silver;
|
|
}
|
|
body.manpage h2 {
|
|
border-style: none;
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|
}
|
|
body.manpage div.sectionbody {
|
|
margin-left: 3em;
|
|
}
|
|
|
|
@media print {
|
|
body.manpage div#toc { display: none; }
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|
}
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|
|
|
|
|
</style>
|
|
<script type="text/javascript">
|
|
/*<+'])');
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|
// Function that scans the DOM tree for header elements (the DOM2
|
|
// nodeIterator API would be a better technique but not supported by all
|
|
// browsers).
|
|
var iterate = function (el) {
|
|
for (var i = el.firstChild; i != null; i = i.nextSibling) {
|
|
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
|
|
var mo = re.exec(i.tagName);
|
|
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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}
|
|
iterate(i);
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}
|
|
}
|
|
}
|
|
iterate(el);
|
|
return result;
|
|
}
|
|
|
|
var toc = document.getElementById("toc");
|
|
if (!toc) {
|
|
return;
|
|
}
|
|
|
|
// Delete existing TOC entries in case we're reloading the TOC.
|
|
var tocEntriesToRemove = [];
|
|
var i;
|
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for (i = 0; i < toc.childNodes.length; i++) {
|
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var entry = toc.childNodes[i];
|
|
if (entry.nodeName.toLowerCase() == 'div'
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&& entry.getAttribute("class")
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&& entry.getAttribute("class").match(/^toclevel/))
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tocEntriesToRemove.push(entry);
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|
}
|
|
for (i = 0; i < tocEntriesToRemove.length; i++) {
|
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toc.removeChild(tocEntriesToRemove[i]);
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}
|
|
|
|
// Rebuild TOC entries.
|
|
var entries = tocEntries(document.getElementById("content"), toclevels);
|
|
for (var i = 0; i < entries.length; ++i) {
|
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var entry = entries[i];
|
|
if (entry.element.id == "")
|
|
entry.element.id = "_toc_" + i;
|
|
var a = document.createElement("a");
|
|
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/*]]>*/
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</script>
|
|
</head>
|
|
<body class="manpage">
|
|
<div id="header">
|
|
<h1>
|
|
gitformat-commit-graph(5) Manual Page
|
|
</h1>
|
|
<h2>NAME</h2>
|
|
<div class="sectionbody">
|
|
<p>gitformat-commit-graph -
|
|
Git commit-graph format
|
|
</p>
|
|
</div>
|
|
</div>
|
|
<div id="content">
|
|
<div class="sect1">
|
|
<h2 id="_synopsis">SYNOPSIS</h2>
|
|
<div class="sectionbody">
|
|
<div class="verseblock">
|
|
<pre class="content">$GIT_DIR/objects/info/commit-graph
|
|
$GIT_DIR/objects/info/commit-graphs/*</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 commit-graph stores a list of commit OIDs and some associated
|
|
metadata, including:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
The generation number of the commit.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The root tree OID.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The commit date.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The parents of the commit, stored using positional references within
|
|
the graph file.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The Bloom filter of the commit carrying the paths that were changed between
|
|
the commit and its first parent, if requested.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
<div class="paragraph"><p>These positional references are stored as unsigned 32-bit integers
|
|
corresponding to the array position within the list of commit OIDs. Due
|
|
to some special constants we use to track parents, we can store at most
|
|
(1 << 30) + (1 << 29) + (1 << 28) - 1 (around 1.8 billion) commits.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_commit_graph_files_have_the_following_format">Commit-graph files have the following format:</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>In order to allow extensions that add extra data to the graph, we organize
|
|
the body into "chunks" and provide a binary lookup table at the beginning
|
|
of the body. The header includes certain values, such as number of chunks
|
|
and hash type.</p></div>
|
|
<div class="paragraph"><p>All multi-byte numbers are in network byte order.</p></div>
|
|
<div class="sect2">
|
|
<h3 id="_header">HEADER:</h3>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>4-byte signature:
|
|
The signature is: {'C', 'G', 'P', 'H'}</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-byte version number:
|
|
Currently, the only valid version is 1.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-byte Hash Version
|
|
We infer the hash length (H) from this value:
|
|
1 => SHA-1
|
|
2 => SHA-256
|
|
If the hash type does not match the repository's hash algorithm, the
|
|
commit-graph file should be ignored with a warning presented to the
|
|
user.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-byte number (C) of "chunks"</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-byte number (B) of base commit-graphs
|
|
We infer the length (H*B) of the Base Graphs chunk
|
|
from this value.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_chunk_lookup">CHUNK LOOKUP:</h3>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>(C + 1) * 12 bytes listing the table of contents for the chunks:
|
|
First 4 bytes describe the chunk id. Value 0 is a terminating label.
|
|
Other 8 bytes provide the byte-offset in current file for chunk to
|
|
start. (Chunks are ordered contiguously in the file, so you can infer
|
|
the length using the next chunk position if necessary.) Each chunk
|
|
ID appears at most once.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The CHUNK LOOKUP matches the table of contents from
|
|
the chunk-based file format, see linkgit:gitformat-chunk[5]</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The remaining data in the body is described one chunk at a time, and
|
|
these chunks may be given in any order. Chunks are required unless
|
|
otherwise specified.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_chunk_data">CHUNK DATA:</h3>
|
|
<div class="sect3">
|
|
<h4 id="_oid_fanout_id_em_o_em_em_i_em_em_d_em_em_f_em_256_4_bytes">OID Fanout (ID: {<em>O</em>, <em>I</em>, <em>D</em>, <em>F</em>}) (256 * 4 bytes)</h4>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The ith entry, F[i], stores the number of OIDs with first
|
|
byte at most i. Thus F[255] stores the total
|
|
number of commits (N).</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_oid_lookup_id_em_o_em_em_i_em_em_d_em_em_l_em_n_h_bytes">OID Lookup (ID: {<em>O</em>, <em>I</em>, <em>D</em>, <em>L</em>}) (N * H bytes)</h4>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The OIDs for all commits in the graph, sorted in ascending order.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_commit_data_id_em_c_em_em_d_em_em_a_em_em_t_em_n_h_16_bytes">Commit Data (ID: {<em>C</em>, <em>D</em>, <em>A</em>, <em>T</em> }) (N * (H + 16) bytes)</h4>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
The first H bytes are for the OID of the root tree.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The next 8 bytes are for the positions of the first two parents
|
|
of the ith commit. Stores value 0x70000000 if no parent in that
|
|
position. If there are more than two parents, the second value
|
|
has its most-significant bit on and the other bits store an array
|
|
position into the Extra Edge List chunk.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The next 8 bytes store the topological level (generation number v1)
|
|
of the commit and
|
|
the commit time in seconds since EPOCH. The generation number
|
|
uses the higher 30 bits of the first 4 bytes, while the commit
|
|
time uses the 32 bits of the second 4 bytes, along with the lowest
|
|
2 bits of the lowest byte, storing the 33rd and 34th bit of the
|
|
commit time.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_generation_data_id_em_g_em_em_d_em_em_a_em_em_2_em_n_4_bytes_optional">Generation Data (ID: {<em>G</em>, <em>D</em>, <em>A</em>, <em>2</em> }) (N * 4 bytes) [Optional]</h4>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
This list of 4-byte values store corrected commit date offsets for the
|
|
commits, arranged in the same order as commit data chunk.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
If the corrected commit date offset cannot be stored within 31 bits,
|
|
the value has its most-significant bit on and the other bits store
|
|
the position of corrected commit date into the Generation Data Overflow
|
|
chunk.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Generation Data chunk is present only when commit-graph file is written
|
|
by compatible versions of Git and in case of split commit-graph chains,
|
|
the topmost layer also has Generation Data chunk.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_generation_data_overflow_id_em_g_em_em_d_em_em_o_em_em_2_em_optional">Generation Data Overflow (ID: {<em>G</em>, <em>D</em>, <em>O</em>, <em>2</em> }) [Optional]</h4>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
This list of 8-byte values stores the corrected commit date offsets
|
|
for commits with corrected commit date offsets that cannot be
|
|
stored within 31 bits.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Generation Data Overflow chunk is present only when Generation Data
|
|
chunk is present and at least one corrected commit date offset cannot
|
|
be stored within 31 bits.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_extra_edge_list_id_em_e_em_em_d_em_em_g_em_em_e_em_optional">Extra Edge List (ID: {<em>E</em>, <em>D</em>, <em>G</em>, <em>E</em>}) [Optional]</h4>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>This list of 4-byte values store the second through nth parents for
|
|
all octopus merges. The second parent value in the commit data stores
|
|
an array position within this list along with the most-significant bit
|
|
on. Starting at that array position, iterate through this list of commit
|
|
positions for the parents until reaching a value with the most-significant
|
|
bit on. The other bits correspond to the position of the last parent.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_bloom_filter_index_id_em_b_em_em_i_em_em_d_em_em_x_em_n_4_bytes_optional">Bloom Filter Index (ID: {<em>B</em>, <em>I</em>, <em>D</em>, <em>X</em>}) (N * 4 bytes) [Optional]</h4>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
The ith entry, BIDX[i], stores the number of bytes in all Bloom filters
|
|
from commit 0 to commit i (inclusive) in lexicographic order. The Bloom
|
|
filter for the i-th commit spans from BIDX[i-1] to BIDX[i] (plus header
|
|
length), where BIDX[-1] is 0.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The BIDX chunk is ignored if the BDAT chunk is not present.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_bloom_filter_data_id_em_b_em_em_d_em_em_a_em_em_t_em_optional">Bloom Filter Data (ID: {<em>B</em>, <em>D</em>, <em>A</em>, <em>T</em>}) [Optional]</h4>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
It starts with header consisting of three unsigned 32-bit integers:
|
|
</p>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
Version of the hash algorithm being used. We currently support
|
|
value 2 which corresponds to the 32-bit version of the murmur3 hash
|
|
implemented exactly as described in
|
|
<a href="https://en.wikipedia.org/wiki/MurmurHash#Algorithm">https://en.wikipedia.org/wiki/MurmurHash#Algorithm</a> and the double
|
|
hashing technique using seed values 0x293ae76f and 0x7e646e2 as
|
|
described in <a href="https://doi.org/10.1007/978-3-540-30494-4_26">https://doi.org/10.1007/978-3-540-30494-4_26</a> "Bloom Filters
|
|
in Probabilistic Verification". Version 1 Bloom filters have a bug that appears
|
|
when char is signed and the repository has path names that have characters >=
|
|
0x80; Git supports reading and writing them, but this ability will be removed
|
|
in a future version of Git.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The number of times a path is hashed and hence the number of bit positions
|
|
that cumulatively determine whether a file is present in the commit.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The minimum number of bits <em>b</em> per entry in the Bloom filter. If the filter
|
|
contains <em>n</em> entries, then the filter size is the minimum number of 64-bit
|
|
words that contain n*b bits.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The rest of the chunk is the concatenation of all the computed Bloom
|
|
filters for the commits in lexicographic order.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Note: Commits with no changes or more than 512 changes have Bloom filters
|
|
of length one, with either all bits set to zero or one respectively.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The BDAT chunk is present if and only if BIDX is present.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_base_graphs_list_id_em_b_em_em_a_em_em_s_em_em_e_em_optional">Base Graphs List (ID: {<em>B</em>, <em>A</em>, <em>S</em>, <em>E</em>}) [Optional]</h4>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>This list of H-byte hashes describe a set of B commit-graph files that
|
|
form a commit-graph chain. The graph position for the ith commit in this
|
|
file's OID Lookup chunk is equal to i plus the number of commits in all
|
|
base graphs. If B is non-zero, this chunk must exist.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_trailer">TRAILER:</h3>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>H-byte HASH-checksum of all of the above.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_historical_notes">Historical Notes:</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The Generation Data (GDA2) and Generation Data Overflow (GDO2) chunks have
|
|
the number <em>2</em> in their chunk IDs because a previous version of Git wrote
|
|
possibly erroneous data in these chunks with the IDs "GDAT" and "GDOV". By
|
|
changing the IDs, newer versions of Git will silently ignore those older
|
|
chunks and write the new information without trusting the incorrect data.</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
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2025-08-18 02:18:23 CEST
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