mirror of
https://github.com/git/git.git
synced 2024-11-27 20:14:30 +08:00
7e82388024
In commit 07e7dbf0d (gc: default aggressive depth to 50, 2016-08-11),
the default aggressive depth of git-gc has been changed to 50. While
git-config(1) has been updated to represent the new default value,
git-gc(1) still mentions the old value. This patch fixes it.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
187 lines
6.7 KiB
Plaintext
187 lines
6.7 KiB
Plaintext
git-gc(1)
|
|
=========
|
|
|
|
NAME
|
|
----
|
|
git-gc - Cleanup unnecessary files and optimize the local repository
|
|
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'git gc' [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune] [--force]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
Runs a number of housekeeping tasks within the current repository,
|
|
such as compressing file revisions (to reduce disk space and increase
|
|
performance) and removing unreachable objects which may have been
|
|
created from prior invocations of 'git add'.
|
|
|
|
Users are encouraged to run this task on a regular basis within
|
|
each repository to maintain good disk space utilization and good
|
|
operating performance.
|
|
|
|
Some git commands may automatically run 'git gc'; see the `--auto` 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:
|
|
|
|
----------------------
|
|
$ git config --global gc.auto 0
|
|
----------------------
|
|
|
|
OPTIONS
|
|
-------
|
|
|
|
--aggressive::
|
|
Usually 'git gc' runs very quickly while providing good disk
|
|
space utilization and performance. This option will cause
|
|
'git gc' 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.
|
|
|
|
--auto::
|
|
With this option, 'git gc' checks whether any housekeeping is
|
|
required; if not, it exits without performing any work.
|
|
Some git commands run `git gc --auto` 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. If the number of loose objects
|
|
exceeds the value of the `gc.auto` configuration variable, then
|
|
all loose objects are combined into a single pack using
|
|
`git repack -d -l`. Setting the value of `gc.auto` to 0
|
|
disables automatic packing of loose objects.
|
|
+
|
|
If the number of packs exceeds the value of `gc.autoPackLimit`,
|
|
then existing packs (except those marked with a `.keep` file)
|
|
are consolidated into a single pack by using the `-A` option of
|
|
'git repack'. Setting `gc.autoPackLimit` to 0 disables
|
|
automatic consolidation of packs.
|
|
|
|
--prune=<date>::
|
|
Prune loose objects older than date (default is 2 weeks ago,
|
|
overridable by the config variable `gc.pruneExpire`).
|
|
--prune=all 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.
|
|
|
|
--no-prune::
|
|
Do not prune any loose objects.
|
|
|
|
--quiet::
|
|
Suppress all progress reports.
|
|
|
|
--force::
|
|
Force `git gc` to run even if there may be another `git gc`
|
|
instance running on this repository.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
The optional configuration variable `gc.reflogExpire` 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 '90 days' or '3 months'.
|
|
It defaults to '90 days'.
|
|
|
|
The optional configuration variable `gc.reflogExpireUnreachable`
|
|
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 `git commit --amend` or `git rebase` 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 '30 days'.
|
|
|
|
The above two configuration variables can be given to a pattern. For
|
|
example, this sets non-default expiry values only to remote-tracking
|
|
branches:
|
|
|
|
------------
|
|
[gc "refs/remotes/*"]
|
|
reflogExpire = never
|
|
reflogExpireUnreachable = 3 days
|
|
------------
|
|
|
|
The optional configuration variable `gc.rerereResolved` indicates
|
|
how long records of conflicted merge you resolved earlier are
|
|
kept. This defaults to 60 days.
|
|
|
|
The optional configuration variable `gc.rerereUnresolved` indicates
|
|
how long records of conflicted merge you have not resolved are
|
|
kept. This defaults to 15 days.
|
|
|
|
The optional configuration variable `gc.packRefs` determines if
|
|
'git gc' runs 'git pack-refs'. 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.
|
|
|
|
The optional configuration variable `gc.aggressiveWindow` 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 linkgit:git-repack[1] for
|
|
more details. This defaults to 250.
|
|
|
|
Similarly, the optional configuration variable `gc.aggressiveDepth`
|
|
controls --depth option in linkgit:git-repack[1]. This defaults to 50.
|
|
|
|
The optional configuration variable `gc.pruneExpire` controls how old
|
|
the unreferenced loose objects have to be before they are pruned. The
|
|
default is "2 weeks ago".
|
|
|
|
|
|
Notes
|
|
-----
|
|
|
|
'git gc' 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 'git filter-branch' 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.
|
|
|
|
On the other hand, when 'git gc' 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:
|
|
|
|
. Any object with modification time newer than the `--prune` date is kept,
|
|
along with everything reachable from it.
|
|
|
|
. 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.
|
|
|
|
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 'git config gc.auto 0'.
|
|
|
|
HOOKS
|
|
-----
|
|
|
|
The 'git gc --auto' command will run the 'pre-auto-gc' hook. See
|
|
linkgit:githooks[5] for more information.
|
|
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkgit:git-prune[1]
|
|
linkgit:git-reflog[1]
|
|
linkgit:git-repack[1]
|
|
linkgit:git-rerere[1]
|
|
|
|
GIT
|
|
---
|
|
Part of the linkgit:git[1] suite
|