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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
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tree24e09d9f84dec336720cf393e156089ca2835791 /Documentation/git-repack.txt
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Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+git-repack(1)
+=============
+
+NAME
+----
+git-repack - Pack unpacked objects in a repository
+
+
+SYNOPSIS
+--------
+[verse]
+'git repack' [-a] [-A] [-d] [-f] [-F] [-l] [-n] [-q] [-b] [-m] [--window=<n>] [--depth=<n>] [--threads=<n>] [--keep-pack=<pack-name>] [--write-midx]
+
+DESCRIPTION
+-----------
+
+This command is used to combine all objects that do not currently
+reside in a "pack", into a pack. It can also be used to re-organize
+existing packs into a single, more efficient pack.
+
+A pack is a collection of objects, individually compressed, with
+delta compression applied, stored in a single file, with an
+associated index file.
+
+Packs are used to reduce the load on mirror systems, backup
+engines, disk storage, etc.
+
+OPTIONS
+-------
+
+-a::
+ Instead of incrementally packing the unpacked objects,
+ pack everything referenced into a single pack.
+ Especially useful when packing a repository that is used
+ for private development. Use
+ with `-d`. This will clean up the objects that `git prune`
+ leaves behind, but `git fsck --full --dangling` shows as
+ dangling.
++
+Note that users fetching over dumb protocols will have to fetch the
+whole new pack in order to get any contained object, no matter how many
+other objects in that pack they already have locally.
++
+Promisor packfiles are repacked separately: if there are packfiles that
+have an associated ".promisor" file, these packfiles will be repacked
+into another separate pack, and an empty ".promisor" file corresponding
+to the new separate pack will be written.
+
+-A::
+ Same as `-a`, unless `-d` is used. Then any unreachable
+ objects in a previous pack become loose, unpacked objects,
+ instead of being left in the old pack. Unreachable objects
+ are never intentionally added to a pack, even when repacking.
+ This option prevents unreachable objects from being immediately
+ deleted by way of being left in the old pack and then
+ removed. Instead, the loose unreachable objects
+ will be pruned according to normal expiry rules
+ with the next 'git gc' invocation. See linkgit:git-gc[1].
+
+-d::
+ After packing, if the newly created packs make some
+ existing packs redundant, remove the redundant packs.
+ Also run 'git prune-packed' to remove redundant
+ loose object files.
+
+--cruft::
+ Same as `-a`, unless `-d` is used. Then any unreachable objects
+ are packed into a separate cruft pack. Unreachable objects can
+ be pruned using the normal expiry rules with the next `git gc`
+ invocation (see linkgit:git-gc[1]). Incompatible with `-k`.
+
+--cruft-expiration=<approxidate>::
+ Expire unreachable objects older than `<approxidate>`
+ immediately instead of waiting for the next `git gc` invocation.
+ Only useful with `--cruft -d`.
+
+--expire-to=<dir>::
+ Write a cruft pack containing pruned objects (if any) to the
+ directory `<dir>`. This option is useful for keeping a copy of
+ any pruned objects in a separate directory as a backup. Only
+ useful with `--cruft -d`.
+
+-l::
+ Pass the `--local` option to 'git pack-objects'. See
+ linkgit:git-pack-objects[1].
+
+-f::
+ Pass the `--no-reuse-delta` option to `git-pack-objects`, see
+ linkgit:git-pack-objects[1].
+
+-F::
+ Pass the `--no-reuse-object` option to `git-pack-objects`, see
+ linkgit:git-pack-objects[1].
+
+-q::
+--quiet::
+ Show no progress over the standard error stream and pass the `-q`
+ option to 'git pack-objects'. See linkgit:git-pack-objects[1].
+
+-n::
+ Do not update the server information with
+ 'git update-server-info'. This option skips
+ updating local catalog files needed to publish
+ this repository (or a direct copy of it)
+ over HTTP or FTP. See linkgit:git-update-server-info[1].
+
+--window=<n>::
+--depth=<n>::
+ These two options affect how the objects contained in the pack are
+ stored using delta compression. The objects are first internally
+ sorted by type, size and optionally names and compared against the
+ other objects within `--window` to see if using delta compression saves
+ space. `--depth` limits the maximum delta depth; making it too deep
+ affects the performance on the unpacker side, because delta data needs
+ to be applied that many times to get to the necessary object.
++
+The default value for --window is 10 and --depth is 50. The maximum
+depth is 4095.
+
+--threads=<n>::
+ This option is passed through to `git pack-objects`.
+
+--window-memory=<n>::
+ This option provides an additional limit on top of `--window`;
+ the window size will dynamically scale down so as to not take
+ up more than '<n>' bytes in memory. This is useful in
+ repositories with a mix of large and small objects to not run
+ out of memory with a large window, but still be able to take
+ advantage of the large window for the smaller objects. The
+ size can be suffixed with "k", "m", or "g".
+ `--window-memory=0` makes memory usage unlimited. The default
+ is taken from the `pack.windowMemory` configuration variable.
+ Note that the actual memory usage will be the limit multiplied
+ by the number of threads used by linkgit:git-pack-objects[1].
+
+--max-pack-size=<n>::
+ Maximum size of each output pack file. The size can be suffixed with
+ "k", "m", or "g". The minimum size allowed is limited to 1 MiB.
+ If specified, multiple packfiles may be created, which also
+ prevents the creation of a bitmap index.
+ The default is unlimited, unless the config variable
+ `pack.packSizeLimit` is set. Note that this option may result in
+ a larger and slower repository; see the discussion in
+ `pack.packSizeLimit`.
+
+-b::
+--write-bitmap-index::
+ Write a reachability bitmap index as part of the repack. This
+ only makes sense when used with `-a`, `-A` or `-m`, as the bitmaps
+ must be able to refer to all reachable objects. This option
+ overrides the setting of `repack.writeBitmaps`. This option
+ has no effect if multiple packfiles are created, unless writing a
+ MIDX (in which case a multi-pack bitmap is created).
+
+--pack-kept-objects::
+ Include objects in `.keep` files when repacking. Note that we
+ still do not delete `.keep` packs after `pack-objects` finishes.
+ This means that we may duplicate objects, but this makes the
+ option safe to use when there are concurrent pushes or fetches.
+ This option is generally only useful if you are writing bitmaps
+ with `-b` or `repack.writeBitmaps`, as it ensures that the
+ bitmapped packfile has the necessary objects.
+
+--keep-pack=<pack-name>::
+ Exclude the given pack from repacking. This is the equivalent
+ of having `.keep` file on the pack. `<pack-name>` is the
+ pack file name without leading directory (e.g. `pack-123.pack`).
+ The option could be specified multiple times to keep multiple
+ packs.
+
+--unpack-unreachable=<when>::
+ When loosening unreachable objects, do not bother loosening any
+ objects older than `<when>`. This can be used to optimize out
+ the write of any objects that would be immediately pruned by
+ a follow-up `git prune`.
+
+-k::
+--keep-unreachable::
+ When used with `-ad`, any unreachable objects from existing
+ packs will be appended to the end of the packfile instead of
+ being removed. In addition, any unreachable loose objects will
+ be packed (and their loose counterparts removed).
+
+-i::
+--delta-islands::
+ Pass the `--delta-islands` option to `git-pack-objects`, see
+ linkgit:git-pack-objects[1].
+
+-g=<factor>::
+--geometric=<factor>::
+ Arrange resulting pack structure so that each successive pack
+ contains at least `<factor>` times the number of objects as the
+ next-largest pack.
++
+`git repack` ensures this by determining a "cut" of packfiles that need
+to be repacked into one in order to ensure a geometric progression. It
+picks the smallest set of packfiles such that as many of the larger
+packfiles (by count of objects contained in that pack) may be left
+intact.
++
+Unlike other repack modes, the set of objects to pack is determined
+uniquely by the set of packs being "rolled-up"; in other words, the
+packs determined to need to be combined in order to restore a geometric
+progression.
++
+When `--unpacked` is specified, loose objects are implicitly included in
+this "roll-up", without respect to their reachability. This is subject
+to change in the future. This option (implying a drastically different
+repack mode) is not guaranteed to work with all other combinations of
+option to `git repack`.
++
+When writing a multi-pack bitmap, `git repack` selects the largest resulting
+pack as the preferred pack for object selection by the MIDX (see
+linkgit:git-multi-pack-index[1]).
+
+-m::
+--write-midx::
+ Write a multi-pack index (see linkgit:git-multi-pack-index[1])
+ containing the non-redundant packs.
+
+CONFIGURATION
+-------------
+
+Various configuration variables affect packing, see
+linkgit:git-config[1] (search for "pack" and "delta").
+
+By default, the command passes `--delta-base-offset` option to
+'git pack-objects'; this typically results in slightly smaller packs,
+but the generated packs are incompatible with versions of Git older than
+version 1.4.4. If you need to share your repository with such ancient Git
+versions, either directly or via the dumb http protocol, then you
+need to set the configuration variable `repack.UseDeltaBaseOffset` to
+"false" and repack. Access from old Git versions over the native protocol
+is unaffected by this option as the conversion is performed on the fly
+as needed in that case.
+
+Delta compression is not used on objects larger than the
+`core.bigFileThreshold` configuration variable and on files with the
+attribute `delta` set to false.
+
+SEE ALSO
+--------
+linkgit:git-pack-objects[1]
+linkgit:git-prune-packed[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite