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| <head> | |
| <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" /> | |
| <meta name="generator" content="AsciiDoc 8.6.10" /> | |
| <title>git-gc(1)</title> | |
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| h1, h2, h3, h4, h5, h6, | |
| div.title, caption.title, | |
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| #toctitle, | |
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| /* DEPRECATED: Pre version 8.2.7 verse style literal block. */ | |
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| span.olive-background { background: olive; } | |
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| div.unbreakable { page-break-inside: avoid; } | |
| /* | |
| * xhtml11 specific | |
| * | |
| * */ | |
| div.tableblock { | |
| margin-top: 1.0em; | |
| margin-bottom: 1.5em; | |
| } | |
| div.tableblock > table { | |
| border: 3px solid #527bbd; | |
| } | |
| thead, p.table.header { | |
| font-weight: bold; | |
| color: #527bbd; | |
| } | |
| p.table { | |
| margin-top: 0; | |
| } | |
| /* Because the table frame attribute is overriden by CSS in most browsers. */ | |
| div.tableblock > table[frame="void"] { | |
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| div.tableblock > table[frame="hsides"] { | |
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| div.tableblock > table[frame="vsides"] { | |
| border-top-style: none; | |
| border-bottom-style: none; | |
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| /* | |
| * html5 specific | |
| * | |
| * */ | |
| table.tableblock { | |
| margin-top: 1.0em; | |
| margin-bottom: 1.5em; | |
| } | |
| thead, p.tableblock.header { | |
| font-weight: bold; | |
| color: #527bbd; | |
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| border-style: solid; | |
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| border-collapse: collapse; | |
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| border-width: 1px; | |
| padding: 4px; | |
| border-style: solid; | |
| border-color: #527bbd; | |
| } | |
| table.tableblock.frame-topbot { | |
| border-left-style: hidden; | |
| border-right-style: hidden; | |
| } | |
| table.tableblock.frame-sides { | |
| border-top-style: hidden; | |
| border-bottom-style: hidden; | |
| } | |
| table.tableblock.frame-none { | |
| border-style: hidden; | |
| } | |
| th.tableblock.halign-left, td.tableblock.halign-left { | |
| text-align: left; | |
| } | |
| th.tableblock.halign-center, td.tableblock.halign-center { | |
| text-align: center; | |
| } | |
| th.tableblock.halign-right, td.tableblock.halign-right { | |
| text-align: right; | |
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| th.tableblock.valign-top, td.tableblock.valign-top { | |
| vertical-align: top; | |
| } | |
| th.tableblock.valign-middle, td.tableblock.valign-middle { | |
| vertical-align: middle; | |
| } | |
| th.tableblock.valign-bottom, td.tableblock.valign-bottom { | |
| vertical-align: bottom; | |
| } | |
| /* | |
| * manpage specific | |
| * | |
| * */ | |
| body.manpage h1 { | |
| padding-top: 0.5em; | |
| padding-bottom: 0.5em; | |
| border-top: 2px solid silver; | |
| border-bottom: 2px solid silver; | |
| } | |
| body.manpage h2 { | |
| border-style: none; | |
| } | |
| body.manpage div.sectionbody { | |
| margin-left: 3em; | |
| } | |
| @media print { | |
| body.manpage div#toc { display: none; } | |
| } | |
| </style> | |
| <script type="text/javascript"> | |
| /*<+'])'); | |
| // 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") { | |
| result[result.length] = new TocEntry(i, getText(i), mo[1]-1); | |
| } | |
| iterate(i); | |
| } | |
| } | |
| } | |
| 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; | |
| for (i = 0; i < toc.childNodes.length; i++) { | |
| var entry = toc.childNodes[i]; | |
| if (entry.nodeName.toLowerCase() == 'div' | |
| && entry.getAttribute("class") | |
| && entry.getAttribute("class").match(/^toclevel/)) | |
| tocEntriesToRemove.push(entry); | |
| } | |
| for (i = 0; i < tocEntriesToRemove.length; i++) { | |
| toc.removeChild(tocEntriesToRemove[i]); | |
| } | |
| // Rebuild TOC entries. | |
| var entries = tocEntries(document.getElementById("content"), toclevels); | |
| for (var i = 0; i < entries.length; ++i) { | |
| var entry = entries[i]; | |
| if (entry.element.id == "") | |
| entry.element.id = "_toc_" + i; | |
| var a = document.createElement("a"); | |
| 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> | |
| git-gc(1) Manual Page | |
| </h1> | |
| <h2>NAME</h2> | |
| <div class="sectionbody"> | |
| <p>git-gc - | |
| Cleanup unnecessary files and optimize the local repository | |
| </p> | |
| </div> | |
| </div> | |
| <div id="content"> | |
| <div class="sect1"> | |
| <h2 id="_synopsis">SYNOPSIS</h2> | |
| <div class="sectionbody"> | |
| <div class="verseblock"> | |
| <pre class="content"><em>git gc</em> [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune] [--force] [--keep-largest-pack]</pre> | |
| <div class="attribution"> | |
| </div></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_description">DESCRIPTION</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>Runs a number of housekeeping tasks within the current repository, | |
| such as compressing file revisions (to reduce disk space and increase | |
| performance), removing unreachable objects which may have been | |
| created from prior invocations of <em>git add</em>, packing refs, pruning | |
| reflog, rerere metadata or stale working trees. May also update ancillary | |
| indexes such as the commit-graph.</p></div> | |
| <div class="paragraph"><p>Users are encouraged to run this task on a regular basis within | |
| each repository to maintain good disk space utilization and good | |
| operating performance.</p></div> | |
| <div class="paragraph"><p>Some git commands may automatically run <em>git gc</em>; see the <code>--auto</code> flag | |
| below for details. If you know what you’re doing and all you want is to | |
| disable this behavior permanently without further considerations, just do:</p></div> | |
| <div class="listingblock"> | |
| <div class="content"> | |
| <pre><code>$ git config --global gc.auto 0</code></pre> | |
| </div></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_options">OPTIONS</h2> | |
| <div class="sectionbody"> | |
| <div class="dlist"><dl> | |
| <dt class="hdlist1"> | |
| --aggressive | |
| </dt> | |
| <dd> | |
| <p> | |
| Usually <em>git gc</em> runs very quickly while providing good disk | |
| space utilization and performance. This option will cause | |
| <em>git gc</em> to more aggressively optimize the repository at the expense | |
| of taking much more time. The effects of this optimization are | |
| persistent, so this option only needs to be used occasionally; every | |
| few hundred changesets or so. | |
| </p> | |
| </dd> | |
| <dt class="hdlist1"> | |
| --auto | |
| </dt> | |
| <dd> | |
| <p> | |
| With this option, <em>git gc</em> checks whether any housekeeping is | |
| required; if not, it exits without performing any work. | |
| Some git commands run <code>git gc --auto</code> after performing | |
| operations that could create many loose objects. Housekeeping | |
| is required if there are too many loose objects or too many | |
| packs in the repository. | |
| </p> | |
| <div class="paragraph"><p>If the number of loose objects exceeds the value of the <code>gc.auto</code> | |
| configuration variable, then all loose objects are combined into a | |
| single pack using <code>git repack -d -l</code>. Setting the value of <code>gc.auto</code> | |
| to 0 disables automatic packing of loose objects.</p></div> | |
| <div class="paragraph"><p>If the number of packs exceeds the value of <code>gc.autoPackLimit</code>, | |
| then existing packs (except those marked with a <code>.keep</code> file | |
| or over <code>gc.bigPackThreshold</code> limit) | |
| are consolidated into a single pack by using the <code>-A</code> option of | |
| <em>git repack</em>. | |
| If the amount of memory is estimated not enough for <code>git repack</code> to | |
| run smoothly and <code>gc.bigPackThreshold</code> is not set, the largest | |
| pack will also be excluded (this is the equivalent of running <code>git gc</code> | |
| with <code>--keep-base-pack</code>). | |
| Setting <code>gc.autoPackLimit</code> to 0 disables automatic consolidation of | |
| packs.</p></div> | |
| <div class="paragraph"><p>If houskeeping is required due to many loose objects or packs, all | |
| other housekeeping tasks (e.g. rerere, working trees, reflog…) will | |
| be performed as well.</p></div> | |
| </dd> | |
| <dt class="hdlist1"> | |
| --prune=<date> | |
| </dt> | |
| <dd> | |
| <p> | |
| Prune loose objects older than date (default is 2 weeks ago, | |
| overridable by the config variable <code>gc.pruneExpire</code>). | |
| --prune=now prunes loose objects regardless of their age and | |
| increases the risk of corruption if another process is writing to | |
| the repository concurrently; see "NOTES" below. --prune is on by | |
| default. | |
| </p> | |
| </dd> | |
| <dt class="hdlist1"> | |
| --no-prune | |
| </dt> | |
| <dd> | |
| <p> | |
| Do not prune any loose objects. | |
| </p> | |
| </dd> | |
| <dt class="hdlist1"> | |
| --quiet | |
| </dt> | |
| <dd> | |
| <p> | |
| Suppress all progress reports. | |
| </p> | |
| </dd> | |
| <dt class="hdlist1"> | |
| --force | |
| </dt> | |
| <dd> | |
| <p> | |
| Force <code>git gc</code> to run even if there may be another <code>git gc</code> | |
| instance running on this repository. | |
| </p> | |
| </dd> | |
| <dt class="hdlist1"> | |
| --keep-largest-pack | |
| </dt> | |
| <dd> | |
| <p> | |
| All packs except the largest pack and those marked with a | |
| <code>.keep</code> files are consolidated into a single pack. When this | |
| option is used, <code>gc.bigPackThreshold</code> is ignored. | |
| </p> | |
| </dd> | |
| </dl></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_configuration">CONFIGURATION</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.reflogExpire</code> can be | |
| set to indicate how long historical entries within each branch’s | |
| reflog should remain available in this repository. The setting is | |
| expressed as a length of time, for example <em>90 days</em> or <em>3 months</em>. | |
| It defaults to <em>90 days</em>.</p></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.reflogExpireUnreachable</code> | |
| can be set to indicate how long historical reflog entries which | |
| are not part of the current branch should remain available in | |
| this repository. These types of entries are generally created as | |
| a result of using <code>git commit --amend</code> or <code>git rebase</code> and are the | |
| commits prior to the amend or rebase occurring. Since these changes | |
| are not part of the current project most users will want to expire | |
| them sooner. This option defaults to <em>30 days</em>.</p></div> | |
| <div class="paragraph"><p>The above two configuration variables can be given to a pattern. For | |
| example, this sets non-default expiry values only to remote-tracking | |
| branches:</p></div> | |
| <div class="listingblock"> | |
| <div class="content"> | |
| <pre><code>[gc "refs/remotes/*"] | |
| reflogExpire = never | |
| reflogExpireUnreachable = 3 days</code></pre> | |
| </div></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.rerereResolved</code> indicates | |
| how long records of conflicted merge you resolved earlier are | |
| kept. This defaults to 60 days.</p></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.rerereUnresolved</code> indicates | |
| how long records of conflicted merge you have not resolved are | |
| kept. This defaults to 15 days.</p></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.packRefs</code> determines if | |
| <em>git gc</em> runs <em>git pack-refs</em>. This can be set to "notbare" to enable | |
| it within all non-bare repos or it can be set to a boolean value. | |
| This defaults to true.</p></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.writeCommitGraph</code> determines if | |
| <em>git gc</em> should run <em>git commit-graph write</em>. This can be set to a | |
| boolean value. This defaults to false.</p></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.aggressiveWindow</code> controls how | |
| much time is spent optimizing the delta compression of the objects in | |
| the repository when the --aggressive option is specified. The larger | |
| the value, the more time is spent optimizing the delta compression. See | |
| the documentation for the --window option in <a href="git-repack.html">git-repack(1)</a> for | |
| more details. This defaults to 250.</p></div> | |
| <div class="paragraph"><p>Similarly, the optional configuration variable <code>gc.aggressiveDepth</code> | |
| controls --depth option in <a href="git-repack.html">git-repack(1)</a>. This defaults to 50.</p></div> | |
| <div class="paragraph"><p>The optional configuration variable <code>gc.pruneExpire</code> controls how old | |
| the unreferenced loose objects have to be before they are pruned. The | |
| default is "2 weeks ago".</p></div> | |
| <div class="paragraph"><p>Optional configuration variable <code>gc.worktreePruneExpire</code> controls how | |
| old a stale working tree should be before <code>git worktree prune</code> deletes | |
| it. Default is "3 months ago".</p></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_notes">NOTES</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p><em>git gc</em> tries very hard not to delete objects that are referenced | |
| anywhere in your repository. In | |
| particular, it will keep not only objects referenced by your current set | |
| of branches and tags, but also objects referenced by the index, | |
| remote-tracking branches, refs saved by <em>git filter-branch</em> in | |
| refs/original/, or reflogs (which may reference commits in branches | |
| that were later amended or rewound). | |
| If you are expecting some objects to be deleted and they aren’t, check | |
| all of those locations and decide whether it makes sense in your case to | |
| remove those references.</p></div> | |
| <div class="paragraph"><p>On the other hand, when <em>git gc</em> runs concurrently with another process, | |
| there is a risk of it deleting an object that the other process is using | |
| but hasn’t created a reference to. This may just cause the other process | |
| to fail or may corrupt the repository if the other process later adds a | |
| reference to the deleted object. Git has two features that significantly | |
| mitigate this problem:</p></div> | |
| <div class="olist arabic"><ol class="arabic"> | |
| <li> | |
| <p> | |
| Any object with modification time newer than the <code>--prune</code> date is kept, | |
| along with everything reachable from it. | |
| </p> | |
| </li> | |
| <li> | |
| <p> | |
| Most operations that add an object to the database update the | |
| modification time of the object if it is already present so that #1 | |
| applies. | |
| </p> | |
| </li> | |
| </ol></div> | |
| <div class="paragraph"><p>However, these features fall short of a complete solution, so users who | |
| run commands concurrently have to live with some risk of corruption (which | |
| seems to be low in practice) unless they turn off automatic garbage | |
| collection with <em>git config gc.auto 0</em>.</p></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_hooks">HOOKS</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p>The <em>git gc --auto</em> command will run the <em>pre-auto-gc</em> hook. See | |
| <a href="githooks.html">githooks(5)</a> for more information.</p></div> | |
| </div> | |
| </div> | |
| <div class="sect1"> | |
| <h2 id="_see_also">SEE ALSO</h2> | |
| <div class="sectionbody"> | |
| <div class="paragraph"><p><a href="git-prune.html">git-prune(1)</a> | |
| <a href="git-reflog.html">git-reflog(1)</a> | |
| <a href="git-repack.html">git-repack(1)</a> | |
| <a href="git-rerere.html">git-rerere(1)</a></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 | |
| 2019-03-11 18:02:43 JST | |
| </div> | |
| </div> | |
| </body> | |
| </html> |