1500 lines
39 KiB
HTML
1500 lines
39 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-index(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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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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}
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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 {
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vertical-align: middle;
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}
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th.tableblock.valign-bottom, td.tableblock.valign-bottom {
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vertical-align: bottom;
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}
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/*
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* manpage specific
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*
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* */
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body.manpage h1 {
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padding-top: 0.5em;
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padding-bottom: 0.5em;
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border-top: 2px solid silver;
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border-bottom: 2px solid silver;
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}
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body.manpage h2 {
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border-style: none;
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}
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body.manpage div.sectionbody {
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margin-left: 3em;
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}
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@media print {
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body.manpage div#toc { display: none; }
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}
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</style>
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<script type="text/javascript">
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/*<+'])');
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// Function that scans the DOM tree for header elements (the DOM2
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// nodeIterator API would be a better technique but not supported by all
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// browsers).
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var iterate = function (el) {
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for (var i = el.firstChild; i != null; i = i.nextSibling) {
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if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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var mo = re.exec(i.tagName);
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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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}
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iterate(i);
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}
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}
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}
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iterate(el);
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return result;
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}
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var toc = document.getElementById("toc");
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if (!toc) {
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return;
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}
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// Delete existing TOC entries in case we're reloading the TOC.
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var tocEntriesToRemove = [];
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var i;
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for (i = 0; i < toc.childNodes.length; i++) {
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var entry = toc.childNodes[i];
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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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}
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for (i = 0; i < tocEntriesToRemove.length; i++) {
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toc.removeChild(tocEntriesToRemove[i]);
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}
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// Rebuild TOC entries.
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var entries = tocEntries(document.getElementById("content"), toclevels);
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for (var i = 0; i < entries.length; ++i) {
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var entry = entries[i];
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if (entry.element.id == "")
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entry.element.id = "_toc_" + i;
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var a = document.createElement("a");
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a.href = "#" + entry.element.id;
|
|
a.appendChild(document.createTextNode(entry.text));
|
|
var div = document.createElement("div");
|
|
div.appendChild(a);
|
|
div.className = "toclevel" + entry.toclevel;
|
|
toc.appendChild(div);
|
|
}
|
|
if (entries.length == 0)
|
|
toc.parentNode.removeChild(toc);
|
|
},
|
|
|
|
|
|
/////////////////////////////////////////////////////////////////////
|
|
// Footnotes generator
|
|
/////////////////////////////////////////////////////////////////////
|
|
|
|
/* Based on footnote generation code from:
|
|
* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
|
|
*/
|
|
|
|
footnotes: function () {
|
|
// Delete existing footnote entries in case we're reloading the footnodes.
|
|
var i;
|
|
var noteholder = document.getElementById("footnotes");
|
|
if (!noteholder) {
|
|
return;
|
|
}
|
|
var entriesToRemove = [];
|
|
for (i = 0; i < noteholder.childNodes.length; i++) {
|
|
var entry = noteholder.childNodes[i];
|
|
if (entry.nodeName.toLowerCase() == 'div' && entry.getAttribute("class") == "footnote")
|
|
entriesToRemove.push(entry);
|
|
}
|
|
for (i = 0; i < entriesToRemove.length; i++) {
|
|
noteholder.removeChild(entriesToRemove[i]);
|
|
}
|
|
|
|
// Rebuild footnote entries.
|
|
var cont = document.getElementById("content");
|
|
var spans = cont.getElementsByTagName("span");
|
|
var refs = {};
|
|
var n = 0;
|
|
for (i=0; i<spans.length; i++) {
|
|
if (spans[i].className == "footnote") {
|
|
n++;
|
|
var note = spans[i].getAttribute("data-note");
|
|
if (!note) {
|
|
// Use [\s\S] in place of . so multi-line matches work.
|
|
// Because JavaScript has no s (dotall) regex flag.
|
|
note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
|
|
spans[i].innerHTML =
|
|
"[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
|
|
"' title='View footnote' class='footnote'>" + n + "</a>]";
|
|
spans[i].setAttribute("data-note", note);
|
|
}
|
|
noteholder.innerHTML +=
|
|
"<div class='footnote' id='_footnote_" + n + "'>" +
|
|
"<a href='#_footnoteref_" + n + "' title='Return to text'>" +
|
|
n + "</a>. " + note + "</div>";
|
|
var id =spans[i].getAttribute("id");
|
|
if (id != null) refs["#"+id] = n;
|
|
}
|
|
}
|
|
if (n == 0)
|
|
noteholder.parentNode.removeChild(noteholder);
|
|
else {
|
|
// Process footnoterefs.
|
|
for (i=0; i<spans.length; i++) {
|
|
if (spans[i].className == "footnoteref") {
|
|
var href = spans[i].getElementsByTagName("a")[0].getAttribute("href");
|
|
href = href.match(/#.*/)[0]; // Because IE return full URL.
|
|
n = refs[href];
|
|
spans[i].innerHTML =
|
|
"[<a href='#_footnote_" + n +
|
|
"' title='View footnote' class='footnote'>" + n + "</a>]";
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
install: function(toclevels) {
|
|
var timerId;
|
|
|
|
function reinstall() {
|
|
asciidoc.footnotes();
|
|
if (toclevels) {
|
|
asciidoc.toc(toclevels);
|
|
}
|
|
}
|
|
|
|
function reinstallAndRemoveTimer() {
|
|
clearInterval(timerId);
|
|
reinstall();
|
|
}
|
|
|
|
timerId = setInterval(reinstall, 500);
|
|
if (document.addEventListener)
|
|
document.addEventListener("DOMContentLoaded", reinstallAndRemoveTimer, false);
|
|
else
|
|
window.onload = reinstallAndRemoveTimer;
|
|
}
|
|
|
|
}
|
|
asciidoc.install();
|
|
/*]]>*/
|
|
</script>
|
|
</head>
|
|
<body class="manpage">
|
|
<div id="header">
|
|
<h1>
|
|
gitformat-index(5) Manual Page
|
|
</h1>
|
|
<h2>NAME</h2>
|
|
<div class="sectionbody">
|
|
<p>gitformat-index -
|
|
Git index 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/index</pre>
|
|
<div class="attribution">
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_description">DESCRIPTION</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Git index format</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_the_git_index_file_has_the_following_format">The Git index file has the following format</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>All binary numbers are in network byte order.
|
|
In a repository using the traditional SHA-1, checksums and object IDs
|
|
(object names) mentioned below are all computed using SHA-1. Similarly,
|
|
in SHA-256 repositories, these values are computed using SHA-256.
|
|
Version 2 is described here unless stated otherwise.</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
A 12-byte header consisting of
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>4-byte signature:
|
|
The signature is { 'D', 'I', 'R', 'C' } (stands for "dircache")</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>4-byte version number:
|
|
The current supported versions are 2, 3 and 4.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit number of index entries.</code></pre>
|
|
</div></div>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
A number of sorted index entries (see below).
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Extensions
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Extensions are identified by signature. Optional extensions can
|
|
be ignored if Git does not understand them.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>4-byte extension signature. If the first byte is 'A'..'Z' the
|
|
extension is optional and can be ignored.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit size of the extension</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Extension data</code></pre>
|
|
</div></div>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Hash checksum over the content of the index file before this checksum.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_index_entry">Index entry</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Index entries are sorted in ascending order on the name field,
|
|
interpreted as a string of unsigned bytes (i.e. memcmp() order, no
|
|
localization, no special casing of directory separator '/'). Entries
|
|
with the same name are sorted by their stage field.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>An index entry typically represents a file. However, if sparse-checkout
|
|
is enabled in cone mode (`core.sparseCheckoutCone` is enabled) and the
|
|
`extensions.sparseIndex` extension is enabled, then the index may
|
|
contain entries for directories outside of the sparse-checkout definition.
|
|
These entries have mode `040000`, include the `SKIP_WORKTREE` bit, and
|
|
the path ends in a directory separator.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit ctime seconds, the last time a file's metadata changed
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit ctime nanosecond fractions
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit mtime seconds, the last time a file's data changed
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit mtime nanosecond fractions
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit dev
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit ino
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit mode, split into (high to low bits)</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>16-bit unused, must be zero</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>4-bit object type
|
|
valid values in binary are 1000 (regular file), 1010 (symbolic link)
|
|
and 1110 (gitlink)</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>3-bit unused, must be zero</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>9-bit unix permission. Only 0755 and 0644 are valid for regular files.
|
|
Symbolic links and gitlinks have value 0 in this field.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit uid
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit gid
|
|
this is stat(2) data</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>32-bit file size
|
|
This is the on-disk size from stat(2), truncated to 32-bit.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Object name for the represented object</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>A 16-bit 'flags' field split into (high to low bits)</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-bit assume-valid flag</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-bit extended flag (must be zero in version 2)</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>2-bit stage (during merge)</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>12-bit name length if the length is less than 0xFFF; otherwise 0xFFF
|
|
is stored in this field.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>(Version 3 or later) A 16-bit field, only applicable if the
|
|
"extended flag" above is 1, split into (high to low bits).</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-bit reserved for future</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-bit skip-worktree flag (used by sparse checkout)</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-bit intent-to-add flag (used by "git add -N")</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>13-bit unused, must be zero</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Entry path name (variable length) relative to top level directory
|
|
(without leading slash). '/' is used as path separator. The special
|
|
path components ".", ".." and ".git" (without quotes) are disallowed.
|
|
Trailing slash is also disallowed.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The exact encoding is undefined, but the '.' and '/' characters
|
|
are encoded in 7-bit ASCII and the encoding cannot contain a NUL
|
|
byte (iow, this is a UNIX pathname).</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>(Version 4) In version 4, the entry path name is prefix-compressed
|
|
relative to the path name for the previous entry (the very first
|
|
entry is encoded as if the path name for the previous entry is an
|
|
empty string). At the beginning of an entry, an integer N in the
|
|
variable width encoding (the same encoding as the offset is encoded
|
|
for OFS_DELTA pack entries; see linkgit:gitformat-pack[5]) is stored, followed
|
|
by a NUL-terminated string S. Removing N bytes from the end of the
|
|
path name for the previous entry, and replacing it with the string S
|
|
yields the path name for this entry.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>1-8 nul bytes as necessary to pad the entry to a multiple of eight bytes
|
|
while keeping the name NUL-terminated.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>(Version 4) In version 4, the padding after the pathname does not
|
|
exist.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Interpretation of index entries in split index mode is completely
|
|
different. See below for details.</code></pre>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_extensions">Extensions</h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="_cache_tree">Cache tree</h3>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Since the index does not record entries for directories, the cache
|
|
entries cannot describe tree objects that already exist in the object
|
|
database for regions of the index that are unchanged from an existing
|
|
commit. The cache tree extension stores a recursive tree structure that
|
|
describes the trees that already exist and completely match sections of
|
|
the cache entries. This speeds up tree object generation from the index
|
|
for a new commit by only computing the trees that are "new" to that
|
|
commit. It also assists when comparing the index to another tree, such
|
|
as `HEAD^{tree}`, since sections of the index can be skipped when a tree
|
|
comparison demonstrates equality.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The recursive tree structure uses nodes that store a number of cache
|
|
entries, a list of subnodes, and an object ID (OID). The OID references
|
|
the existing tree for that node, if it is known to exist. The subnodes
|
|
correspond to subdirectories that themselves have cache tree nodes. The
|
|
number of cache entries corresponds to the number of cache entries in
|
|
the index that describe paths within that tree's directory.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The extension tracks the full directory structure in the cache tree
|
|
extension, but this is generally smaller than the full cache entry list.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>When a path is updated in index, Git invalidates all nodes of the
|
|
recursive cache tree corresponding to the parent directories of that
|
|
path. We store these tree nodes as being "invalid" by using "-1" as the
|
|
number of cache entries. Invalid nodes still store a span of index
|
|
entries, allowing Git to focus its efforts when reconstructing a full
|
|
cache tree.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The signature for this extension is { 'T', 'R', 'E', 'E' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>A series of entries fill the entire extension; each of which
|
|
consists of:</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
NUL-terminated path component (relative to its parent directory);
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
ASCII decimal number of entries in the index that is covered by the
|
|
tree this entry represents (entry_count);
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
A space (ASCII 32);
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
ASCII decimal number that represents the number of subtrees this
|
|
tree has;
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
A newline (ASCII 10); and
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Object name for the object that would result from writing this span
|
|
of index as a tree.
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>An entry can be in an invalidated state and is represented by having
|
|
a negative number in the entry_count field. In this case, there is no
|
|
object name and the next entry starts immediately after the newline.
|
|
When writing an invalid entry, -1 should always be used as entry_count.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The entries are written out in the top-down, depth-first order. The
|
|
first entry represents the root level of the repository, followed by the
|
|
first subtree--let's call this A--of the root level (with its name
|
|
relative to the root level), followed by the first subtree of A (with
|
|
its name relative to A), and so on. The specified number of subtrees
|
|
indicates when the current level of the recursive stack is complete.</code></pre>
|
|
</div></div>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_resolve_undo">Resolve undo</h3>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>A conflict is represented in the index as a set of higher stage entries.
|
|
When a conflict is resolved (e.g. with "git add path"), these higher
|
|
stage entries will be removed and a stage-0 entry with proper resolution
|
|
is added.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>When these higher stage entries are removed, they are saved in the
|
|
resolve undo extension, so that conflicts can be recreated (e.g. with
|
|
"git checkout -m"), in case users want to redo a conflict resolution
|
|
from scratch.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The signature for this extension is { 'R', 'E', 'U', 'C' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>A series of entries fill the entire extension; each of which
|
|
consists of:</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
NUL-terminated pathname the entry describes (relative to the root of
|
|
the repository, i.e. full pathname);
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Three NUL-terminated ASCII octal numbers, entry mode of entries in
|
|
stage 1 to 3 (a missing stage is represented by "0" in this field);
|
|
and
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
At most three object names of the entry in stages from 1 to 3
|
|
(nothing is written for a missing stage).
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_split_index">Split index</h3>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>In split index mode, the majority of index entries could be stored
|
|
in a separate file. This extension records the changes to be made on
|
|
top of that to produce the final index.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The signature for this extension is { 'l', 'i', 'n', 'k' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The extension consists of:</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
Hash of the shared index file. The shared index file path
|
|
is $GIT_DIR/sharedindex.<hash>. If all bits are zero, the
|
|
index does not require a shared index file.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An ewah-encoded delete bitmap, each bit represents an entry in the
|
|
shared index. If a bit is set, its corresponding entry in the
|
|
shared index will be removed from the final index. Note, because
|
|
a delete operation changes index entry positions, but we do need
|
|
original positions in replace phase, it’s best to just mark
|
|
entries for removal, then do a mass deletion after replacement.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An ewah-encoded replace bitmap, each bit represents an entry in
|
|
the shared index. If a bit is set, its corresponding entry in the
|
|
shared index will be replaced with an entry in this index
|
|
file. All replaced entries are stored in sorted order in this
|
|
index. The first "1" bit in the replace bitmap corresponds to the
|
|
first index entry, the second "1" bit to the second entry and so
|
|
on. Replaced entries may have empty path names to save space.
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The remaining index entries after replaced ones will be added to the
|
|
final index. These added entries are also sorted by entry name then
|
|
stage.</code></pre>
|
|
</div></div>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_untracked_cache">Untracked cache</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Untracked cache saves the untracked file list and necessary data to
|
|
verify the cache. The signature for this extension is { 'U', 'N',
|
|
'T', 'R' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The extension starts with</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
A sequence of NUL-terminated strings, preceded by the size of the
|
|
sequence in variable width encoding. Each string describes the
|
|
environment where the cache can be used.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Stat data of $GIT_DIR/info/exclude. See "Index entry" section from
|
|
ctime field until "file size".
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Stat data of core.excludesFile
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
32-bit dir_flags (see struct dir_struct)
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Hash of $GIT_DIR/info/exclude. A null hash means the file
|
|
does not exist.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Hash of core.excludesFile. A null hash means the file does
|
|
not exist.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
NUL-terminated string of per-dir exclude file name. This usually
|
|
is ".gitignore".
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The number of following directory blocks, variable width
|
|
encoding. If this number is zero, the extension ends here with a
|
|
following NUL.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
A number of directory blocks in depth-first-search order, each
|
|
consists of
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The number of untracked entries, variable width encoding.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The number of sub-directory blocks, variable width encoding.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
The directory name terminated by NUL.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
A number of untracked file/dir names terminated by NUL.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
<div class="paragraph"><p>The remaining data of each directory block is grouped by type:</p></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
An ewah bitmap, the n-th bit marks whether the n-th directory has
|
|
valid untracked cache entries.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An ewah bitmap, the n-th bit records "check-only" bit of
|
|
read_directory_recursive() for the n-th directory.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An ewah bitmap, the n-th bit indicates whether hash and stat data
|
|
is valid for the n-th directory and exists in the next data.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An array of stat data. The n-th data corresponds with the n-th
|
|
"one" bit in the previous ewah bitmap.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An array of hashes. The n-th hash corresponds with the n-th "one" bit
|
|
in the previous ewah bitmap.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
One NUL.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_file_system_monitor_cache">File System Monitor cache</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The file system monitor cache tracks files for which the core.fsmonitor
|
|
hook has told us about changes. The signature for this extension is
|
|
{ 'F', 'S', 'M', 'N' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The extension starts with</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
32-bit version number: the current supported versions are 1 and 2.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
(Version 1)
|
|
64-bit time: the extension data reflects all changes through the given
|
|
time which is stored as the nanoseconds elapsed since midnight,
|
|
January 1, 1970.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
(Version 2)
|
|
A null terminated string: an opaque token defined by the file system
|
|
monitor application. The extension data reflects all changes relative
|
|
to that token.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
32-bit bitmap size: the size of the CE_FSMONITOR_VALID bitmap.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
An ewah bitmap, the n-th bit indicates whether the n-th index entry
|
|
is not CE_FSMONITOR_VALID.
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_end_of_index_entry">End of Index Entry</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The End of Index Entry (EOIE) is used to locate the end of the variable
|
|
length index entries and the beginning of the extensions. Code can take
|
|
advantage of this to quickly locate the index extensions without having
|
|
to parse through all of the index entries.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Because it must be able to be loaded before the variable length cache
|
|
entries and other index extensions, this extension must be written last.
|
|
The signature for this extension is { 'E', 'O', 'I', 'E' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The extension consists of:</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
32-bit offset to the end of the index entries
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
Hash over the extension types and their sizes (but not
|
|
their contents). E.g. if we have "TREE" extension that is N-bytes
|
|
long, "REUC" extension that is M-bytes long, followed by "EOIE",
|
|
then the hash would be:
|
|
</p>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>Hash("TREE" + <binary-representation-of-N> +
|
|
"REUC" + <binary-representation-of-M>)</code></pre>
|
|
</div></div>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_index_entry_offset_table">Index Entry Offset Table</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The Index Entry Offset Table (IEOT) is used to help address the CPU
|
|
cost of loading the index by enabling multi-threading the process of
|
|
converting cache entries from the on-disk format to the in-memory format.
|
|
The signature for this extension is { 'I', 'E', 'O', 'T' }.</code></pre>
|
|
</div></div>
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>The extension consists of:</code></pre>
|
|
</div></div>
|
|
<div class="ulist"><ul>
|
|
<li>
|
|
<p>
|
|
32-bit version (currently 1)
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
A number of index offset entries each consisting of:
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
32-bit offset from the beginning of the file to the first cache entry
|
|
in this block of entries.
|
|
</p>
|
|
</li>
|
|
<li>
|
|
<p>
|
|
32-bit count of cache entries in this block
|
|
</p>
|
|
</li>
|
|
</ul></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_sparse_directory_entries">Sparse Directory Entries</h2>
|
|
<div class="sectionbody">
|
|
<div class="literalblock">
|
|
<div class="content">
|
|
<pre><code>When using sparse-checkout in cone mode, some entire directories within
|
|
the index can be summarized by pointing to a tree object instead of the
|
|
entire expanded list of paths within that tree. An index containing such
|
|
entries is a "sparse index". Index format versions 4 and less were not
|
|
implemented with such entries in mind. Thus, for these versions, an
|
|
index containing sparse directory entries will include this extension
|
|
with signature { 's', 'd', 'i', 'r' }. Like the split-index extension,
|
|
tools should avoid interacting with a sparse index unless they understand
|
|
this extension.</code></pre>
|
|
</div></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
|
|
2025-08-18 02:18:23 CEST
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|