243 lines
9.2 KiB
Plaintext
243 lines
9.2 KiB
Plaintext
git-pack-objects(1)
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===================
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NAME
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----
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git-pack-objects - Create a packed archive of objects
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SYNOPSIS
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--------
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[verse]
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'git pack-objects' [-q | --progress | --all-progress] [--all-progress-implied]
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[--no-reuse-delta] [--delta-base-offset] [--non-empty]
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[--local] [--incremental] [--window=<n>] [--depth=<n>]
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[--revs [--unpacked | --all]] [--stdout | base-name]
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[--shallow] [--keep-true-parents] < object-list
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DESCRIPTION
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-----------
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Reads list of objects from the standard input, and writes a packed
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archive with specified base-name, or to the standard output.
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A packed archive is an efficient way to transfer a set of objects
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between two repositories as well as an access efficient archival
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format. In a packed archive, an object is either stored as a
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compressed whole or as a difference from some other object.
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The latter is often called a delta.
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The packed archive format (.pack) is designed to be self-contained
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so that it can be unpacked without any further information. Therefore,
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each object that a delta depends upon must be present within the pack.
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A pack index file (.idx) is generated for fast, random access to the
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objects in the pack. Placing both the index file (.idx) and the packed
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archive (.pack) in the pack/ subdirectory of $GIT_OBJECT_DIRECTORY (or
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any of the directories on $GIT_ALTERNATE_OBJECT_DIRECTORIES)
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enables Git to read from the pack archive.
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The 'git unpack-objects' command can read the packed archive and
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expand the objects contained in the pack into "one-file
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one-object" format; this is typically done by the smart-pull
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commands when a pack is created on-the-fly for efficient network
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transport by their peers.
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OPTIONS
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-------
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base-name::
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Write into a pair of files (.pack and .idx), using
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<base-name> to determine the name of the created file.
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When this option is used, the two files are written in
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<base-name>-<SHA-1>.{pack,idx} files. <SHA-1> is a hash
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based on the pack content and is written to the standard
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output of the command.
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--stdout::
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Write the pack contents (what would have been written to
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.pack file) out to the standard output.
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--revs::
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Read the revision arguments from the standard input, instead of
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individual object names. The revision arguments are processed
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the same way as 'git rev-list' with the `--objects` flag
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uses its `commit` arguments to build the list of objects it
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outputs. The objects on the resulting list are packed.
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Besides revisions, `--not` or `--shallow <SHA-1>` lines are
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also accepted.
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--unpacked::
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This implies `--revs`. When processing the list of
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revision arguments read from the standard input, limit
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the objects packed to those that are not already packed.
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--all::
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This implies `--revs`. In addition to the list of
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revision arguments read from the standard input, pretend
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as if all refs under `refs/` are specified to be
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included.
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--include-tag::
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Include unasked-for annotated tags if the object they
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reference was included in the resulting packfile. This
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can be useful to send new tags to native Git clients.
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--window=<n>::
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--depth=<n>::
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These two options affect how the objects contained in
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the pack are stored using delta compression. The
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objects are first internally sorted by type, size and
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optionally names and compared against the other objects
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within --window to see if using delta compression saves
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space. --depth limits the maximum delta depth; making
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it too deep affects the performance on the unpacker
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side, because delta data needs to be applied that many
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times to get to the necessary object.
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The default value for --window is 10 and --depth is 50.
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--window-memory=<n>::
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This option provides an additional limit on top of `--window`;
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the window size will dynamically scale down so as to not take
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up more than '<n>' bytes in memory. This is useful in
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repositories with a mix of large and small objects to not run
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out of memory with a large window, but still be able to take
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advantage of the large window for the smaller objects. The
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size can be suffixed with "k", "m", or "g".
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`--window-memory=0` makes memory usage unlimited. The default
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is taken from the `pack.windowMemory` configuration variable.
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--max-pack-size=<n>::
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Maximum size of each output pack file. The size can be suffixed with
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"k", "m", or "g". The minimum size allowed is limited to 1 MiB.
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If specified, multiple packfiles may be created, which also
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prevents the creation of a bitmap index.
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The default is unlimited, unless the config variable
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`pack.packSizeLimit` is set.
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--honor-pack-keep::
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This flag causes an object already in a local pack that
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has a .keep file to be ignored, even if it would have
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otherwise been packed.
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--incremental::
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This flag causes an object already in a pack to be ignored
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even if it would have otherwise been packed.
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--local::
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This flag causes an object that is borrowed from an alternate
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object store to be ignored even if it would have otherwise been
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packed.
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--non-empty::
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Only create a packed archive if it would contain at
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least one object.
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--progress::
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Progress status is reported on the standard error stream
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by default when it is attached to a terminal, unless -q
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is specified. This flag forces progress status even if
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the standard error stream is not directed to a terminal.
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--all-progress::
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When --stdout is specified then progress report is
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displayed during the object count and compression phases
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but inhibited during the write-out phase. The reason is
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that in some cases the output stream is directly linked
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to another command which may wish to display progress
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status of its own as it processes incoming pack data.
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This flag is like --progress except that it forces progress
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report for the write-out phase as well even if --stdout is
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used.
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--all-progress-implied::
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This is used to imply --all-progress whenever progress display
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is activated. Unlike --all-progress this flag doesn't actually
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force any progress display by itself.
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-q::
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This flag makes the command not to report its progress
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on the standard error stream.
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--no-reuse-delta::
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When creating a packed archive in a repository that
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has existing packs, the command reuses existing deltas.
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This sometimes results in a slightly suboptimal pack.
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This flag tells the command not to reuse existing deltas
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but compute them from scratch.
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--no-reuse-object::
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This flag tells the command not to reuse existing object data at all,
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including non deltified object, forcing recompression of everything.
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This implies --no-reuse-delta. Useful only in the obscure case where
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wholesale enforcement of a different compression level on the
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packed data is desired.
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--compression=<n>::
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Specifies compression level for newly-compressed data in the
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generated pack. If not specified, pack compression level is
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determined first by pack.compression, then by core.compression,
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and defaults to -1, the zlib default, if neither is set.
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Add --no-reuse-object if you want to force a uniform compression
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level on all data no matter the source.
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--thin::
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Create a "thin" pack by omitting the common objects between a
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sender and a receiver in order to reduce network transfer. This
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option only makes sense in conjunction with --stdout.
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+
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Note: A thin pack violates the packed archive format by omitting
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required objects and is thus unusable by Git without making it
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self-contained. Use `git index-pack --fix-thin`
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(see linkgit:git-index-pack[1]) to restore the self-contained property.
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--shallow::
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Optimize a pack that will be provided to a client with a shallow
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repository. This option, combined with --thin, can result in a
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smaller pack at the cost of speed.
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--delta-base-offset::
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A packed archive can express the base object of a delta as
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either a 20-byte object name or as an offset in the
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stream, but ancient versions of Git don't understand the
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latter. By default, 'git pack-objects' only uses the
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former format for better compatibility. This option
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allows the command to use the latter format for
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compactness. Depending on the average delta chain
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length, this option typically shrinks the resulting
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packfile by 3-5 per-cent.
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+
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Note: Porcelain commands such as `git gc` (see linkgit:git-gc[1]),
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`git repack` (see linkgit:git-repack[1]) pass this option by default
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in modern Git when they put objects in your repository into pack files.
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So does `git bundle` (see linkgit:git-bundle[1]) when it creates a bundle.
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--threads=<n>::
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Specifies the number of threads to spawn when searching for best
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delta matches. This requires that pack-objects be compiled with
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pthreads otherwise this option is ignored with a warning.
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This is meant to reduce packing time on multiprocessor machines.
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The required amount of memory for the delta search window is
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however multiplied by the number of threads.
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Specifying 0 will cause Git to auto-detect the number of CPU's
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and set the number of threads accordingly.
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--index-version=<version>[,<offset>]::
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This is intended to be used by the test suite only. It allows
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to force the version for the generated pack index, and to force
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64-bit index entries on objects located above the given offset.
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--keep-true-parents::
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With this option, parents that are hidden by grafts are packed
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nevertheless.
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SEE ALSO
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--------
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linkgit:git-rev-list[1]
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linkgit:git-repack[1]
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linkgit:git-prune-packed[1]
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GIT
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---
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Part of the linkgit:git[1] suite
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