Gecko [ edgpens.lpkmn.gov.my ]

Name	Size	Permission
howto	[ DIR ]	drwxrwxrwx
technical	[ DIR ]	drwxrwxrwx
MyFirstContribution.html	101.54 KB	-rw-rw-rw-
MyFirstObjectWalk.html	72.23 KB	-rw-rw-rw-
SubmittingPatches.html	63.36 KB	-rw-rw-rw-
ToolsForGit.html	32.1 KB	-rw-rw-rw-
docbook-xsl.css	4.45 KB	-rw-rw-rw-
everyday.html	29.84 KB	-rw-rw-rw-
git-add.html	50.6 KB	-rw-rw-rw-
git-am.html	42.42 KB	-rw-rw-rw-
git-annotate.html	40.26 KB	-rw-rw-rw-
git-apply.html	44.28 KB	-rw-rw-rw-
git-archive.html	41.15 KB	-rw-rw-rw-
git-bash.html	34.89 KB	-rw-rw-rw-
git-bisect-lk2009.html	92.39 KB	-rw-rw-rw-
git-bisect.html	52.17 KB	-rw-rw-rw-
git-blame.html	51.15 KB	-rw-rw-rw-
git-branch.html	51.74 KB	-rw-rw-rw-
git-bugreport.html	32.14 KB	-rw-rw-rw-
git-bundle.html	45.7 KB	-rw-rw-rw-
git-cat-file.html	47.64 KB	-rw-rw-rw-
git-check-attr.html	34.93 KB	-rw-rw-rw-
git-check-ignore.html	35.68 KB	-rw-rw-rw-
git-check-mailmap.html	31.67 KB	-rw-rw-rw-
git-check-ref-format.html	36.54 KB	-rw-rw-rw-
git-checkout-index.html	37.72 KB	-rw-rw-rw-
git-checkout.html	59.77 KB	-rw-rw-rw-
git-cherry-pick.html	42.18 KB	-rw-rw-rw-
git-cherry.html	35.1 KB	-rw-rw-rw-
git-citool.html	30.53 KB	-rw-rw-rw-
git-clean.html	35.76 KB	-rw-rw-rw-
git-clone.html	52.58 KB	-rw-rw-rw-
git-column.html	32.85 KB	-rw-rw-rw-
git-commit-graph.html	36.99 KB	-rw-rw-rw-
git-commit-tree.html	39.13 KB	-rw-rw-rw-
git-commit.html	65.26 KB	-rw-rw-rw-
git-config.html	367.82 KB	-rw-rw-rw-
git-count-objects.html	31.79 KB	-rw-rw-rw-
git-credential-cache--daemon.h...	31.06 KB	-rw-rw-rw-
git-credential-cache.html	32.78 KB	-rw-rw-rw-
git-credential-store.html	34.74 KB	-rw-rw-rw-
git-credential.html	37.47 KB	-rw-rw-rw-
git-daemon.html	46.12 KB	-rw-rw-rw-
git-describe.html	40.33 KB	-rw-rw-rw-
git-diff-files.html	86.05 KB	-rw-rw-rw-
git-diff-index.html	91.17 KB	-rw-rw-rw-
git-diff-tree.html	117.23 KB	-rw-rw-rw-
git-diff.html	95.61 KB	-rw-rw-rw-
git-difftool.html	37.25 KB	-rw-rw-rw-
git-fast-export.html	43.41 KB	-rw-rw-rw-
git-fast-import.html	111.36 KB	-rw-rw-rw-
git-fetch-pack.html	35.51 KB	-rw-rw-rw-
git-fetch.html	75.8 KB	-rw-rw-rw-
git-filter-branch.html	65.54 KB	-rw-rw-rw-
git-fmt-merge-msg.html	33.93 KB	-rw-rw-rw-
git-for-each-ref.html	50.37 KB	-rw-rw-rw-
git-for-each-repo.html	32.12 KB	-rw-rw-rw-
git-format-patch.html	88 KB	-rw-rw-rw-
git-fsck-objects.html	30.29 KB	-rw-rw-rw-
git-fsck.html	41.54 KB	-rw-rw-rw-
git-fsmonitor--daemon.html	32.83 KB	-rw-rw-rw-
git-gc.html	45.33 KB	-rw-rw-rw-
git-get-tar-commit-id.html	30.72 KB	-rw-rw-rw-
git-grep.html	46.16 KB	-rw-rw-rw-
git-gui.html	34.8 KB	-rw-rw-rw-
git-hash-object.html	32.4 KB	-rw-rw-rw-
git-help.html	39.51 KB	-rw-rw-rw-
git-hook.html	31.37 KB	-rw-rw-rw-
git-http-backend.html	43.25 KB	-rw-rw-rw-
git-http-fetch.html	32.29 KB	-rw-rw-rw-
git-http-push.html	34.02 KB	-rw-rw-rw-
git-imap-send.html	37.59 KB	-rw-rw-rw-
git-index-pack.html	36.71 KB	-rw-rw-rw-
git-init-db.html	30.34 KB	-rw-rw-rw-
git-init.html	38.32 KB	-rw-rw-rw-
git-instaweb.html	33.23 KB	-rw-rw-rw-
git-interpret-trailers.html	50.23 KB	-rw-rw-rw-
git-log.html	169.99 KB	-rw-rw-rw-
git-ls-files.html	41.98 KB	-rw-rw-rw-
git-ls-remote.html	35.17 KB	-rw-rw-rw-
git-ls-tree.html	37.84 KB	-rw-rw-rw-
git-mailinfo.html	35.02 KB	-rw-rw-rw-
git-mailsplit.html	31.95 KB	-rw-rw-rw-
git-maintenance.html	52.57 KB	-rw-rw-rw-
git-merge-base.html	40.83 KB	-rw-rw-rw-
git-merge-file.html	34.2 KB	-rw-rw-rw-
git-merge-index.html	33.18 KB	-rw-rw-rw-
git-merge-one-file.html	30.3 KB	-rw-rw-rw-
git-merge-tree.html	30.72 KB	-rw-rw-rw-
git-merge.html	78.28 KB	-rw-rw-rw-
git-mergetool--lib.html	31.87 KB	-rw-rw-rw-
git-mergetool.html	50.4 KB	-rw-rw-rw-
git-mktag.html	32.6 KB	-rw-rw-rw-
git-mktree.html	31.25 KB	-rw-rw-rw-
git-multi-pack-index.html	35.81 KB	-rw-rw-rw-
git-mv.html	32.81 KB	-rw-rw-rw-
git-name-rev.html	34.27 KB	-rw-rw-rw-
git-notes.html	49.29 KB	-rw-rw-rw-
git-p4.html	67.74 KB	-rw-rw-rw-
git-pack-objects.html	53.28 KB	-rw-rw-rw-
git-pack-redundant.html	31.61 KB	-rw-rw-rw-
git-pack-refs.html	32.54 KB	-rw-rw-rw-
git-patch-id.html	32.58 KB	-rw-rw-rw-
git-prune-packed.html	31.36 KB	-rw-rw-rw-
git-prune.html	33.06 KB	-rw-rw-rw-
git-pull.html	85.03 KB	-rw-rw-rw-
git-push.html	76.99 KB	-rw-rw-rw-
git-quiltimport.html	32.19 KB	-rw-rw-rw-
git-range-diff.html	43.82 KB	-rw-rw-rw-
git-read-tree.html	50.85 KB	-rw-rw-rw-
git-rebase.html	103.48 KB	-rw-rw-rw-
git-receive-pack.html	42.71 KB	-rw-rw-rw-
git-reflog.html	36.09 KB	-rw-rw-rw-
git-remote-ext.html	35.34 KB	-rw-rw-rw-
git-remote-fd.html	32.28 KB	-rw-rw-rw-
git-remote-helpers.html	29.82 KB	-rw-rw-rw-
git-remote.html	42.5 KB	-rw-rw-rw-
git-repack.html	41.93 KB	-rw-rw-rw-
git-replace.html	37.28 KB	-rw-rw-rw-
git-request-pull.html	33.02 KB	-rw-rw-rw-
git-rerere.html	39.71 KB	-rw-rw-rw-
git-reset.html	56.54 KB	-rw-rw-rw-
git-restore.html	39.97 KB	-rw-rw-rw-
git-rev-list.html	118.22 KB	-rw-rw-rw-
git-rev-parse.html	72.3 KB	-rw-rw-rw-
git-revert.html	37.42 KB	-rw-rw-rw-
git-rm.html	39.86 KB	-rw-rw-rw-
git-send-email.html	57.84 KB	-rw-rw-rw-
git-send-pack.html	36.87 KB	-rw-rw-rw-
git-sh-i18n--envsubst.html	31.05 KB	-rw-rw-rw-
git-sh-i18n.html	31.39 KB	-rw-rw-rw-
git-sh-setup.html	33.75 KB	-rw-rw-rw-
git-shell.html	34.17 KB	-rw-rw-rw-
git-shortlog.html	71.45 KB	-rw-rw-rw-
git-show-branch.html	38.33 KB	-rw-rw-rw-
git-show-index.html	32.2 KB	-rw-rw-rw-
git-show-ref.html	37.47 KB	-rw-rw-rw-
git-show.html	112.74 KB	-rw-rw-rw-
git-sparse-checkout.html	54.09 KB	-rw-rw-rw-
git-stage.html	30.24 KB	-rw-rw-rw-
git-stash.html	48.68 KB	-rw-rw-rw-
git-status.html	53.31 KB	-rw-rw-rw-
git-stripspace.html	32.76 KB	-rw-rw-rw-
git-submodule.html	55.69 KB	-rw-rw-rw-
git-subtree.html	47.96 KB	-rw-rw-rw-
git-svn.html	89.33 KB	-rw-rw-rw-
git-switch.html	41.98 KB	-rw-rw-rw-
git-symbolic-ref.html	32.69 KB	-rw-rw-rw-
git-tag.html	49.74 KB	-rw-rw-rw-
git-tools.html	30.05 KB	-rw-rw-rw-
git-unpack-file.html	30.51 KB	-rw-rw-rw-
git-unpack-objects.html	31.57 KB	-rw-rw-rw-
git-update-index.html	60.6 KB	-rw-rw-rw-
git-update-ref.html	38.35 KB	-rw-rw-rw-
git-update-server-info.html	30.84 KB	-rw-rw-rw-
git-upload-archive.html	32.58 KB	-rw-rw-rw-
git-upload-pack.html	32.47 KB	-rw-rw-rw-
git-var.html	32.49 KB	-rw-rw-rw-
git-verify-commit.html	30.76 KB	-rw-rw-rw-
git-verify-pack.html	31.71 KB	-rw-rw-rw-
git-verify-tag.html	30.75 KB	-rw-rw-rw-
git-version.html	30.66 KB	-rw-rw-rw-
git-web--browse.html	35.06 KB	-rw-rw-rw-
git-whatchanged.html	31.39 KB	-rw-rw-rw-
git-worktree.html	56.98 KB	-rw-rw-rw-
git-write-tree.html	31.25 KB	-rw-rw-rw-
git.html	106.92 KB	-rw-rw-rw-
gitattributes.html	92.19 KB	-rw-rw-rw-
gitcli.html	42 KB	-rw-rw-rw-
gitcore-tutorial.html	111 KB	-rw-rw-rw-
gitcredentials.html	43.44 KB	-rw-rw-rw-
gitcvs-migration.html	39.85 KB	-rw-rw-rw-
gitdiffcore.html	46.2 KB	-rw-rw-rw-
giteveryday.html	50.37 KB	-rw-rw-rw-
gitfaq.html	56.09 KB	-rw-rw-rw-
gitglossary.html	67.99 KB	-rw-rw-rw-
githooks.html	65.99 KB	-rw-rw-rw-
gitignore.html	40.59 KB	-rw-rw-rw-
gitk.html	40.38 KB	-rw-rw-rw-
gitmailmap.html	35.57 KB	-rw-rw-rw-
gitmodules.html	36.43 KB	-rw-rw-rw-
gitnamespaces.html	34.91 KB	-rw-rw-rw-
gitremote-helpers.html	58.26 KB	-rw-rw-rw-
gitrepository-layout.html	50.05 KB	-rw-rw-rw-
gitrevisions.html	51.97 KB	-rw-rw-rw-
gitsubmodules.html	44.09 KB	-rw-rw-rw-
gittutorial-2.html	46.96 KB	-rw-rw-rw-
gittutorial.html	57.55 KB	-rw-rw-rw-
gitweb.conf.html	80.7 KB	-rw-rw-rw-
gitweb.html	63.57 KB	-rw-rw-rw-
gitworkflows.html	52.47 KB	-rw-rw-rw-
howto-index.html	35.7 KB	-rw-rw-rw-
index.html	106.92 KB	-rw-rw-rw-
user-manual.html	261.1 KB	-rw-rw-rw-

Code Editor : git-maintenance.html

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<title>git-maintenance(1)</title>
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<body class="manpage">
<div id="header">
<h1>git-maintenance(1) Manual Page</h1>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>git-maintenance - Run tasks to optimize Git repository data</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 maintenance</em> run [&lt;options&gt;]
<em>git maintenance</em> start [--scheduler=&lt;scheduler&gt;]
<em>git maintenance</em> (stop|register|unregister)</pre>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Run tasks to optimize Git repository data, speeding up other Git commands
and reducing storage requirements for the repository.</p>
</div>
<div class="paragraph">
<p>Git commands that add repository data, such as <code>git add</code> or <code>git fetch</code>,
are optimized for a responsive user experience. These commands do not take
time to optimize the Git data, since such optimizations scale with the full
size of the repository while these user commands each perform a relatively
small action.</p>
</div>
<div class="paragraph">
<p>The <code>git maintenance</code> command provides flexibility for how to optimize the
Git repository.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_subcommands">SUBCOMMANDS</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">run</dt>
<dd>
<p>Run one or more maintenance tasks. If one or more <code>--task</code> options
are specified, then those tasks are run in that order. Otherwise,
the tasks are determined by which <code>maintenance.&lt;task&gt;.enabled</code>
config options are true. By default, only <code>maintenance.gc.enabled</code>
is true.</p>
</dd>
<dt class="hdlist1">start</dt>
<dd>
<p>Start running maintenance on the current repository. This performs
the same config updates as the <code>register</code> subcommand, then updates
the background scheduler to run <code>git maintenance run --scheduled</code>
on an hourly basis.</p>
</dd>
<dt class="hdlist1">stop</dt>
<dd>
<p>Halt the background maintenance schedule. The current repository
is not removed from the list of maintained repositories, in case
the background maintenance is restarted later.</p>
</dd>
<dt class="hdlist1">register</dt>
<dd>
<p>Initialize Git config values so any scheduled maintenance will
start running on this repository. This adds the repository to the
<code>maintenance.repo</code> config variable in the current user&#8217;s global
config and enables some recommended configuration values for
<code>maintenance.&lt;task&gt;.schedule</code>. The tasks that are enabled are safe
for running in the background without disrupting foreground
processes.</p>
<div class="paragraph">
<p>The <code>register</code> subcommand will also set the <code>maintenance.strategy</code> config
value to <code>incremental</code>, if this value is not previously set. The
<code>incremental</code> strategy uses the following schedule for each maintenance
task:</p>
</div>
<div class="openblock">
<div class="content">
<div class="ulist">
<ul>
<li>
<p><code>gc</code>: disabled.</p>
</li>
<li>
<p><code>commit-graph</code>: hourly.</p>
</li>
<li>
<p><code>prefetch</code>: hourly.</p>
</li>
<li>
<p><code>loose-objects</code>: daily.</p>
</li>
<li>
<p><code>incremental-repack</code>: daily.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="paragraph">
<p><code>git maintenance register</code> will also disable foreground maintenance by
setting <code>maintenance.auto = false</code> in the current repository. This config
setting will remain after a <code>git maintenance unregister</code> command.</p>
</div>
</dd>
<dt class="hdlist1">unregister</dt>
<dd>
<p>Remove the current repository from background maintenance. This
only removes the repository from the configured list. It does not
stop the background maintenance processes from running.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_tasks">TASKS</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">commit-graph</dt>
<dd>
<p>The <code>commit-graph</code> job updates the <code>commit-graph</code> files incrementally,
then verifies that the written data is correct. The incremental
write is safe to run alongside concurrent Git processes since it
will not expire <code>.graph</code> files that were in the previous
<code>commit-graph-chain</code> file. They will be deleted by a later run based
on the expiration delay.</p>
</dd>
<dt class="hdlist1">prefetch</dt>
<dd>
<p>The <code>prefetch</code> task updates the object directory with the latest
objects from all registered remotes. For each remote, a <code>git fetch</code>
command is run. The configured refspec is modified to place all
requested refs within <code>refs/prefetch/</code>. Also, tags are not updated.</p>
<div class="paragraph">
<p>This is done to avoid disrupting the remote-tracking branches. The end users
expect these refs to stay unmoved unless they initiate a fetch.  With prefetch
task, however, the objects necessary to complete a later real fetch would
already be obtained, so the real fetch would go faster.  In the ideal case,
it will just become an update to a bunch of remote-tracking branches without
any object transfer.</p>
</div>
</dd>
<dt class="hdlist1">gc</dt>
<dd>
<p>Clean up unnecessary files and optimize the local repository. "GC"
stands for "garbage collection," but this task performs many
smaller tasks. This task can be expensive for large repositories,
as it repacks all Git objects into a single pack-file. It can also
be disruptive in some situations, as it deletes stale data. See
<a href="git-gc.html">git-gc(1)</a> for more details on garbage collection in Git.</p>
</dd>
<dt class="hdlist1">loose-objects</dt>
<dd>
<p>The <code>loose-objects</code> job cleans up loose objects and places them into
pack-files. In order to prevent race conditions with concurrent Git
commands, it follows a two-step process. First, it deletes any loose
objects that already exist in a pack-file; concurrent Git processes
will examine the pack-file for the object data instead of the loose
object. Second, it creates a new pack-file (starting with "loose-")
containing a batch of loose objects. The batch size is limited to 50
thousand objects to prevent the job from taking too long on a
repository with many loose objects. The <code>gc</code> task writes unreachable
objects as loose objects to be cleaned up by a later step only if
they are not re-added to a pack-file; for this reason it is not
advisable to enable both the <code>loose-objects</code> and <code>gc</code> tasks at the
same time.</p>
</dd>
<dt class="hdlist1">incremental-repack</dt>
<dd>
<p>The <code>incremental-repack</code> job repacks the object directory
using the <code>multi-pack-index</code> feature. In order to prevent race
conditions with concurrent Git commands, it follows a two-step
process. First, it calls <code>git multi-pack-index expire</code> to delete
pack-files unreferenced by the <code>multi-pack-index</code> file. Second, it
calls <code>git multi-pack-index repack</code> to select several small
pack-files and repack them into a bigger one, and then update the
<code>multi-pack-index</code> entries that refer to the small pack-files to
refer to the new pack-file. This prepares those small pack-files
for deletion upon the next run of <code>git multi-pack-index expire</code>.
The selection of the small pack-files is such that the expected
size of the big pack-file is at least the batch size; see the
<code>--batch-size</code> option for the <code>repack</code> subcommand in
<a href="git-multi-pack-index.html">git-multi-pack-index(1)</a>. The default batch-size is zero,
which is a special case that attempts to repack all pack-files
into a single pack-file.</p>
</dd>
<dt class="hdlist1">pack-refs</dt>
<dd>
<p>The <code>pack-refs</code> task collects the loose reference files and
collects them into a single file. This speeds up operations that
need to iterate across many references. See <a href="git-pack-refs.html">git-pack-refs(1)</a>
for more information.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">--auto</dt>
<dd>
<p>When combined with the <code>run</code> subcommand, run maintenance tasks
only if certain thresholds are met. For example, the <code>gc</code> task
runs when the number of loose objects exceeds the number stored
in the <code>gc.auto</code> config setting, or when the number of pack-files
exceeds the <code>gc.autoPackLimit</code> config setting. Not compatible with
the <code>--schedule</code> option.</p>
</dd>
<dt class="hdlist1">--schedule</dt>
<dd>
<p>When combined with the <code>run</code> subcommand, run maintenance tasks
only if certain time conditions are met, as specified by the
<code>maintenance.&lt;task&gt;.schedule</code> config value for each <code>&lt;task&gt;</code>.
This config value specifies a number of seconds since the last
time that task ran, according to the <code>maintenance.&lt;task&gt;.lastRun</code>
config value. The tasks that are tested are those provided by
the <code>--task=&lt;task&gt;</code> option(s) or those with
<code>maintenance.&lt;task&gt;.enabled</code> set to true.</p>
</dd>
<dt class="hdlist1">--quiet</dt>
<dd>
<p>Do not report progress or other information over <code>stderr</code>.</p>
</dd>
<dt class="hdlist1">--task=&lt;task&gt;</dt>
<dd>
<p>If this option is specified one or more times, then only run the
specified tasks in the specified order. If no <code>--task=&lt;task&gt;</code>
arguments are specified, then only the tasks with
<code>maintenance.&lt;task&gt;.enabled</code> configured as <code>true</code> are considered.
See the <em>TASKS</em> section for the list of accepted <code>&lt;task&gt;</code> values.</p>
</dd>
<dt class="hdlist1">--scheduler=auto|crontab|systemd-timer|launchctl|schtasks</dt>
<dd>
<p>When combined with the <code>start</code> subcommand, specify the scheduler
for running the hourly, daily and weekly executions of
<code>git maintenance run</code>.
Possible values for <code>&lt;scheduler&gt;</code> are <code>auto</code>, <code>crontab</code>
(POSIX), <code>systemd-timer</code> (Linux), <code>launchctl</code> (macOS), and
<code>schtasks</code> (Windows). When <code>auto</code> is specified, the
appropriate platform-specific scheduler is used; on Linux,
<code>systemd-timer</code> is used if available, otherwise
<code>crontab</code>. Default is <code>auto</code>.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_troubleshooting">TROUBLESHOOTING</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>git maintenance</code> command is designed to simplify the repository
maintenance patterns while minimizing user wait time during Git commands.
A variety of configuration options are available to allow customizing this
process. The default maintenance options focus on operations that complete
quickly, even on large repositories.</p>
</div>
<div class="paragraph">
<p>Users may find some cases where scheduled maintenance tasks do not run as
frequently as intended. Each <code>git maintenance run</code> command takes a lock on
the repository&#8217;s object database, and this prevents other concurrent
<code>git maintenance run</code> commands from running on the same repository. Without
this safeguard, competing processes could leave the repository in an
unpredictable state.</p>
</div>
<div class="paragraph">
<p>The background maintenance schedule runs <code>git maintenance run</code> processes
on an hourly basis. Each run executes the "hourly" tasks. At midnight,
that process also executes the "daily" tasks. At midnight on the first day
of the week, that process also executes the "weekly" tasks. A single
process iterates over each registered repository, performing the scheduled
tasks for that frequency. Depending on the number of registered
repositories and their sizes, this process may take longer than an hour.
In this case, multiple <code>git maintenance run</code> commands may run on the same
repository at the same time, colliding on the object database lock. This
results in one of the two tasks not running.</p>
</div>
<div class="paragraph">
<p>If you find that some maintenance windows are taking longer than one hour
to complete, then consider reducing the complexity of your maintenance
tasks. For example, the <code>gc</code> task is much slower than the
<code>incremental-repack</code> task. However, this comes at a cost of a slightly
larger object database. Consider moving more expensive tasks to be run
less frequently.</p>
</div>
<div class="paragraph">
<p>Expert users may consider scheduling their own maintenance tasks using a
different schedule than is available through <code>git maintenance start</code> and
Git configuration options. These users should be aware of the object
database lock and how concurrent <code>git maintenance run</code> commands behave.
Further, the <code>git gc</code> command should not be combined with
<code>git maintenance run</code> commands. <code>git gc</code> modifies the object database
but does not take the lock in the same way as <code>git maintenance run</code>. If
possible, use <code>git maintenance run --task=gc</code> instead of <code>git gc</code>.</p>
</div>
<div class="paragraph">
<p>The following sections describe the mechanisms put in place to run
background maintenance by <code>git maintenance start</code> and how to customize
them.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_background_maintenance_on_posix_systems">BACKGROUND MAINTENANCE ON POSIX SYSTEMS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The standard mechanism for scheduling background tasks on POSIX systems
is cron(8). This tool executes commands based on a given schedule. The
current list of user-scheduled tasks can be found by running <code>crontab -l</code>.
The schedule written by <code>git maintenance start</code> is similar to this:</p>
</div>
<div class="listingblock">
<div class="content">
<pre># BEGIN GIT MAINTENANCE SCHEDULE
# The following schedule was created by Git
# Any edits made in this region might be
# replaced in the future by a Git command.

0 1-23 * * * "/&lt;path&gt;/git" --exec-path="/&lt;path&gt;" for-each-repo --config=maintenance.repo maintenance run --schedule=hourly
0 0 * * 1-6 "/&lt;path&gt;/git" --exec-path="/&lt;path&gt;" for-each-repo --config=maintenance.repo maintenance run --schedule=daily
0 0 * * 0 "/&lt;path&gt;/git" --exec-path="/&lt;path&gt;" for-each-repo --config=maintenance.repo maintenance run --schedule=weekly

# END GIT MAINTENANCE SCHEDULE</pre>
</div>
</div>
<div class="paragraph">
<p>The comments are used as a region to mark the schedule as written by Git.
Any modifications within this region will be completely deleted by
<code>git maintenance stop</code> or overwritten by <code>git maintenance start</code>.</p>
</div>
<div class="paragraph">
<p>The <code>crontab</code> entry specifies the full path of the <code>git</code> executable to
ensure that the executed <code>git</code> command is the same one with which
<code>git maintenance start</code> was issued independent of <code>PATH</code>. If the same user
runs <code>git maintenance start</code> with multiple Git executables, then only the
latest executable is used.</p>
</div>
<div class="paragraph">
<p>These commands use <code>git for-each-repo --config=maintenance.repo</code> to run
<code>git maintenance run --schedule=&lt;frequency&gt;</code> on each repository listed in
the multi-valued <code>maintenance.repo</code> config option. These are typically
loaded from the user-specific global config. The <code>git maintenance</code> process
then determines which maintenance tasks are configured to run on each
repository with each <code>&lt;frequency&gt;</code> using the <code>maintenance.&lt;task&gt;.schedule</code>
config options. These values are loaded from the global or repository
config values.</p>
</div>
<div class="paragraph">
<p>If the config values are insufficient to achieve your desired background
maintenance schedule, then you can create your own schedule. If you run
<code>crontab -e</code>, then an editor will load with your user-specific <code>cron</code>
schedule. In that editor, you can add your own schedule lines. You could
start by adapting the default schedule listed earlier, or you could read
the crontab(5) documentation for advanced scheduling techniques. Please
do use the full path and <code>--exec-path</code> techniques from the default
schedule to ensure you are executing the correct binaries in your
schedule.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_background_maintenance_on_linux_systemd_systems">BACKGROUND MAINTENANCE ON LINUX SYSTEMD SYSTEMS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>While Linux supports <code>cron</code>, depending on the distribution, <code>cron</code> may
be an optional package not necessarily installed. On modern Linux
distributions, systemd timers are superseding it.</p>
</div>
<div class="paragraph">
<p>If user systemd timers are available, they will be used as a replacement
of <code>cron</code>.</p>
</div>
<div class="paragraph">
<p>In this case, <code>git maintenance start</code> will create user systemd timer units
and start the timers. The current list of user-scheduled tasks can be found
by running <code>systemctl --user list-timers</code>. The timers written by <code>git
maintenance start</code> are similar to this:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ systemctl --user list-timers
NEXT                         LEFT          LAST                         PASSED     UNIT                         ACTIVATES
Thu 2021-04-29 19:00:00 CEST 42min left    Thu 2021-04-29 18:00:11 CEST 17min ago  git-maintenance@hourly.timer git-maintenance@hourly.service
Fri 2021-04-30 00:00:00 CEST 5h 42min left Thu 2021-04-29 00:00:11 CEST 18h ago    git-maintenance@daily.timer  git-maintenance@daily.service
Mon 2021-05-03 00:00:00 CEST 3 days left   Mon 2021-04-26 00:00:11 CEST 3 days ago git-maintenance@weekly.timer git-maintenance@weekly.service</pre>
</div>
</div>
<div class="paragraph">
<p>One timer is registered for each <code>--schedule=&lt;frequency&gt;</code> option.</p>
</div>
<div class="paragraph">
<p>The definition of the systemd units can be inspected in the following files:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>~/.config/systemd/user/git-maintenance@.timer
~/.config/systemd/user/git-maintenance@.service
~/.config/systemd/user/timers.target.wants/git-maintenance@hourly.timer
~/.config/systemd/user/timers.target.wants/git-maintenance@daily.timer
~/.config/systemd/user/timers.target.wants/git-maintenance@weekly.timer</pre>
</div>
</div>
<div class="paragraph">
<p><code>git maintenance start</code> will overwrite these files and start the timer
again with <code>systemctl --user</code>, so any customization should be done by
creating a drop-in file, i.e. a <code>.conf</code> suffixed file in the
<code>~/.config/systemd/user/git-maintenance@.service.d</code> directory.</p>
</div>
<div class="paragraph">
<p><code>git maintenance stop</code> will stop the user systemd timers and delete
the above mentioned files.</p>
</div>
<div class="paragraph">
<p>For more details, see <code>systemd.timer(5)</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_background_maintenance_on_macos_systems">BACKGROUND MAINTENANCE ON MACOS SYSTEMS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>While macOS technically supports <code>cron</code>, using <code>crontab -e</code> requires
elevated privileges and the executed process does not have a full user
context. Without a full user context, Git and its credential helpers
cannot access stored credentials, so some maintenance tasks are not
functional.</p>
</div>
<div class="paragraph">
<p>Instead, <code>git maintenance start</code> interacts with the <code>launchctl</code> tool,
which is the recommended way to schedule timed jobs in macOS. Scheduling
maintenance through <code>git maintenance (start|stop)</code> requires some
<code>launchctl</code> features available only in macOS 10.11 or later.</p>
</div>
<div class="paragraph">
<p>Your user-specific scheduled tasks are stored as XML-formatted <code>.plist</code>
files in <code>~/Library/LaunchAgents/</code>. You can see the currently-registered
tasks using the following command:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ ls ~/Library/LaunchAgents/org.git-scm.git*
org.git-scm.git.daily.plist
org.git-scm.git.hourly.plist
org.git-scm.git.weekly.plist</pre>
</div>
</div>
<div class="paragraph">
<p>One task is registered for each <code>--schedule=&lt;frequency&gt;</code> option. To
inspect how the XML format describes each schedule, open one of these
<code>.plist</code> files in an editor and inspect the <code>&lt;array&gt;</code> element following
the <code>&lt;key&gt;StartCalendarInterval&lt;/key&gt;</code> element.</p>
</div>
<div class="paragraph">
<p><code>git maintenance start</code> will overwrite these files and register the
tasks again with <code>launchctl</code>, so any customizations should be done by
creating your own <code>.plist</code> files with distinct names. Similarly, the
<code>git maintenance stop</code> command will unregister the tasks with <code>launchctl</code>
and delete the <code>.plist</code> files.</p>
</div>
<div class="paragraph">
<p>To create more advanced customizations to your background tasks, see
launchctl.plist(5) for more information.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_background_maintenance_on_windows_systems">BACKGROUND MAINTENANCE ON WINDOWS SYSTEMS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Windows does not support <code>cron</code> and instead has its own system for
scheduling background tasks. The <code>git maintenance start</code> command uses
the <code>schtasks</code> command to submit tasks to this system. You can inspect
all background tasks using the Task Scheduler application. The tasks
added by Git have names of the form <code>Git Maintenance (&lt;frequency&gt;)</code>.
The Task Scheduler GUI has ways to inspect these tasks, but you can also
export the tasks to XML files and view the details there.</p>
</div>
<div class="paragraph">
<p>Note that since Git is a console application, these background tasks
create a console window visible to the current user. This can be changed
manually by selecting the "Run whether user is logged in or not" option
in Task Scheduler. This change requires a password input, which is why
<code>git maintenance start</code> does not select it by default.</p>
</div>
<div class="paragraph">
<p>If you want to customize the background tasks, please rename the tasks
so future calls to <code>git maintenance (start|stop)</code> do not overwrite your
custom tasks.</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>
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