2006-12-27 07:17:59 +00:00
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git-gc(1)
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=========
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NAME
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----
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git-gc - Cleanup unnecessary files and optimize the local repository
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SYNOPSIS
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--------
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gc: call "prune --expire 2.weeks.ago" by default
The only reason we did not call "prune" in git-gc was that it is an
inherently dangerous operation: if there is a commit going on, you will
prune loose objects that were just created, and are, in fact, needed by the
commit object just about to be created.
Since it is dangerous, we told users so. That led to many users not even
daring to run it when it was actually safe. Besides, they are users, and
should not have to remember such details as when to call git-gc with
--prune, or to call git-prune directly.
Of course, the consequence was that "git gc --auto" gets triggered much
more often than we would like, since unreferenced loose objects (such as
left-overs from a rebase or a reset --hard) were never pruned.
Alas, git-prune recently learnt the option --expire <minimum-age>, which
makes it a much safer operation. This allows us to call prune from git-gc,
with a grace period of 2 weeks for the unreferenced loose objects (this
value was determined in a discussion on the git list as a safe one).
If you want to override this grace period, just set the config variable
gc.pruneExpire to a different value; an example would be
[gc]
pruneExpire = 6.months.ago
or even "never", if you feel really paranoid.
Note that this new behaviour makes "--prune" be a no-op.
While adding a test to t5304-prune.sh (since it really tests the implicit
call to "prune"), also the original test for "prune --expire" was moved
there from t1410-reflog.sh, where it did not belong.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2008-03-12 20:55:47 +00:00
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'git-gc' [--aggressive] [--auto] [--quiet]
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2006-12-27 07:17:59 +00:00
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DESCRIPTION
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-----------
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Runs a number of housekeeping tasks within the current repository,
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such as compressing file revisions (to reduce disk space and increase
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performance) and removing unreachable objects which may have been
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2007-12-29 06:20:38 +00:00
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created from prior invocations of linkgit:git-add[1].
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2006-12-27 07:17:59 +00:00
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Users are encouraged to run this task on a regular basis within
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each repository to maintain good disk space utilization and good
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2008-03-19 21:06:11 +00:00
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operating performance.
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Some git commands may automatically run `git-gc`; see the `--auto` flag
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below for details. If you know what you're doing and all you want is to
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disable this behavior permanently without further considerations, just do:
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----------------------
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$ git config --global gc.auto 0
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----------------------
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2006-12-27 07:17:59 +00:00
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2007-01-22 07:28:28 +00:00
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OPTIONS
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-------
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2007-05-09 19:48:39 +00:00
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--aggressive::
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Usually 'git-gc' runs very quickly while providing good disk
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2007-05-31 23:00:48 +00:00
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space utilization and performance. This option will cause
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git-gc to more aggressively optimize the repository at the expense
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2007-05-09 19:48:39 +00:00
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of taking much more time. The effects of this optimization are
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2007-05-31 23:00:48 +00:00
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persistent, so this option only needs to be used occasionally; every
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2007-05-09 19:48:39 +00:00
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few hundred changesets or so.
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2007-09-17 07:39:52 +00:00
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--auto::
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2007-10-19 02:05:10 +00:00
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With this option, `git gc` checks whether any housekeeping is
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required; if not, it exits without performing any work.
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Some git commands run `git gc --auto` after performing
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operations that could create many loose objects.
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+
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Housekeeping is required if there are too many loose objects or
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too many packs in the repository. If the number of loose objects
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exceeds the value of the `gc.auto` configuration variable, then
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all loose objects are combined into a single pack using
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`git-repack -d -l`. Setting the value of `gc.auto` to 0
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disables automatic packing of loose objects.
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+
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If the number of packs exceeds the value of `gc.autopacklimit`,
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then existing packs (except those marked with a `.keep` file)
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are consolidated into a single pack by using the `-A` option of
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`git-repack`. Setting `gc.autopacklimit` to 0 disables
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automatic consolidation of packs.
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2007-01-22 07:28:28 +00:00
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2008-02-29 21:53:39 +00:00
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--quiet::
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Suppress all progress reports.
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2006-12-27 07:17:59 +00:00
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Configuration
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-------------
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The optional configuration variable 'gc.reflogExpire' can be
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set to indicate how long historical entries within each branch's
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reflog should remain available in this repository. The setting is
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expressed as a length of time, for example '90 days' or '3 months'.
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It defaults to '90 days'.
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The optional configuration variable 'gc.reflogExpireUnreachable'
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can be set to indicate how long historical reflog entries which
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are not part of the current branch should remain available in
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this repository. These types of entries are generally created as
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a result of using `git commit \--amend` or `git rebase` and are the
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2007-01-17 15:32:41 +00:00
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commits prior to the amend or rebase occurring. Since these changes
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2006-12-27 07:17:59 +00:00
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are not part of the current project most users will want to expire
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them sooner. This option defaults to '30 days'.
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The optional configuration variable 'gc.rerereresolved' indicates
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how long records of conflicted merge you resolved earlier are
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kept. This defaults to 60 days.
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The optional configuration variable 'gc.rerereunresolved' indicates
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how long records of conflicted merge you have not resolved are
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kept. This defaults to 15 days.
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2007-02-13 13:01:42 +00:00
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The optional configuration variable 'gc.packrefs' determines if
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2008-01-09 16:05:16 +00:00
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`git gc` runs `git-pack-refs`. This can be set to "nobare" to enable
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it within all non-bare repos or it can be set to a boolean value.
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This defaults to true.
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2006-12-27 07:17:59 +00:00
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2007-05-09 19:48:39 +00:00
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The optional configuration variable 'gc.aggressiveWindow' controls how
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much time is spent optimizing the delta compression of the objects in
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the repository when the --aggressive option is specified. The larger
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the value, the more time is spent optimizing the delta compression. See
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2007-12-29 06:20:38 +00:00
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the documentation for the --window' option in linkgit:git-repack[1] for
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2007-05-09 19:48:39 +00:00
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more details. This defaults to 10.
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gc: call "prune --expire 2.weeks.ago" by default
The only reason we did not call "prune" in git-gc was that it is an
inherently dangerous operation: if there is a commit going on, you will
prune loose objects that were just created, and are, in fact, needed by the
commit object just about to be created.
Since it is dangerous, we told users so. That led to many users not even
daring to run it when it was actually safe. Besides, they are users, and
should not have to remember such details as when to call git-gc with
--prune, or to call git-prune directly.
Of course, the consequence was that "git gc --auto" gets triggered much
more often than we would like, since unreferenced loose objects (such as
left-overs from a rebase or a reset --hard) were never pruned.
Alas, git-prune recently learnt the option --expire <minimum-age>, which
makes it a much safer operation. This allows us to call prune from git-gc,
with a grace period of 2 weeks for the unreferenced loose objects (this
value was determined in a discussion on the git list as a safe one).
If you want to override this grace period, just set the config variable
gc.pruneExpire to a different value; an example would be
[gc]
pruneExpire = 6.months.ago
or even "never", if you feel really paranoid.
Note that this new behaviour makes "--prune" be a no-op.
While adding a test to t5304-prune.sh (since it really tests the implicit
call to "prune"), also the original test for "prune --expire" was moved
there from t1410-reflog.sh, where it did not belong.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2008-03-12 20:55:47 +00:00
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The optional configuration variable 'gc.pruneExpire' controls how old
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the unreferenced loose objects have to be before they are pruned. The
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default is "2 weeks ago".
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2008-04-24 01:28:36 +00:00
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Notes
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-----
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git-gc tries very hard to be safe about the garbage it collects. In
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particular, it will keep not only objects referenced by your current set
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of branches and tags, but also objects referenced by the index, remote
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tracking branches, refs saved by linkgit:git-filter-branch[1] in
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refs/original/, or reflogs (which may references commits in branches
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that were later amended or rewound).
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If you are expecting some objects to be collected and they aren't, check
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all of those locations and decide whether it makes sense in your case to
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remove those references.
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2006-12-27 07:17:59 +00:00
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See Also
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--------
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2007-12-29 06:20:38 +00:00
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linkgit:git-prune[1]
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linkgit:git-reflog[1]
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linkgit:git-repack[1]
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linkgit:git-rerere[1]
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2006-12-27 07:17:59 +00:00
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Author
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------
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Written by Shawn O. Pearce <spearce@spearce.org>
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GIT
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---
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2007-12-29 06:20:38 +00:00
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Part of the linkgit:git[7] suite
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