git-pack-objects man page on SmartOS

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       git-pack-objects - Create a packed archive of objects

       git pack-objects [-q | --progress | --all-progress] [--all-progress-implied]
	       [--no-reuse-delta] [--delta-base-offset] [--non-empty]
	       [--local] [--incremental] [--window=<n>] [--depth=<n>]
	       [--revs [--unpacked | --all]] [--stdout | base-name]
	       [--keep-true-parents] < object-list

       Reads list of objects from the standard input, and writes a packed
       archive with specified base-name, or to the standard output.

       A packed archive is an efficient way to transfer a set of objects
       between two repositories as well as an access efficient archival
       format. In a packed archive, an object is either stored as a compressed
       whole or as a difference from some other object. The latter is often
       called a delta.

       The packed archive format (.pack) is designed to be self-contained so
       that it can be unpacked without any further information. Therefore,
       each object that a delta depends upon must be present within the pack.

       A pack index file (.idx) is generated for fast, random access to the
       objects in the pack. Placing both the index file (.idx) and the packed
       archive (.pack) in the pack/ subdirectory of $GIT_OBJECT_DIRECTORY (or
       any of the directories on $GIT_ALTERNATE_OBJECT_DIRECTORIES) enables
       Git to read from the pack archive.

       The git unpack-objects command can read the packed archive and expand
       the objects contained in the pack into "one-file one-object" format;
       this is typically done by the smart-pull commands when a pack is
       created on-the-fly for efficient network transport by their peers.

	   Write into a pair of files (.pack and .idx), using <base-name> to
	   determine the name of the created file. When this option is used,
	   the two files are written in <base-name>-<SHA-1>.{pack,idx} files.
	   <SHA-1> is a hash based on the pack content and is written to the
	   standard output of the command.

	   Write the pack contents (what would have been written to .pack
	   file) out to the standard output.

	   Read the revision arguments from the standard input, instead of
	   individual object names. The revision arguments are processed the
	   same way as git rev-list with the --objects flag uses its commit
	   arguments to build the list of objects it outputs. The objects on
	   the resulting list are packed.

	   This implies --revs. When processing the list of revision arguments
	   read from the standard input, limit the objects packed to those
	   that are not already packed.

	   This implies --revs. In addition to the list of revision arguments
	   read from the standard input, pretend as if all refs under refs/
	   are specified to be included.

	   Include unasked-for annotated tags if the object they reference was
	   included in the resulting packfile. This can be useful to send new
	   tags to native Git clients.

       --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.

	   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, which is the

	   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. The default
	   is unlimited, unless the config variable pack.packSizeLimit is set.

	   This flag causes an object already in a local pack that has a .keep
	   file to be ignored, even if it would have otherwise been packed.

	   This flag causes an object already in a pack to be ignored even if
	   it would have otherwise been packed.

	   This flag causes an object that is borrowed from an alternate
	   object store to be ignored even if it would have otherwise been

	   Only create a packed archive if it would contain at least one

	   Progress status is reported on the standard error stream by default
	   when it is attached to a terminal, unless -q is specified. This
	   flag forces progress status even if the standard error stream is
	   not directed to a terminal.

	   When --stdout is specified then progress report is displayed during
	   the object count and compression phases but inhibited during the
	   write-out phase. The reason is that in some cases the output stream
	   is directly linked to another command which may wish to display
	   progress status of its own as it processes incoming pack data. This
	   flag is like --progress except that it forces progress report for
	   the write-out phase as well even if --stdout is used.

	   This is used to imply --all-progress whenever progress display is
	   activated. Unlike --all-progress this flag doesn’t actually force
	   any progress display by itself.

	   This flag makes the command not to report its progress on the
	   standard error stream.

	   When creating a packed archive in a repository that has existing
	   packs, the command reuses existing deltas. This sometimes results
	   in a slightly suboptimal pack. This flag tells the command not to
	   reuse existing deltas but compute them from scratch.

	   This flag tells the command not to reuse existing object data at
	   all, including non deltified object, forcing recompression of
	   everything. This implies --no-reuse-delta. Useful only in the
	   obscure case where wholesale enforcement of a different compression
	   level on the packed data is desired.

	   Specifies compression level for newly-compressed data in the
	   generated pack. If not specified, pack compression level is
	   determined first by pack.compression, then by core.compression, and
	   defaults to -1, the zlib default, if neither is set. Add
	   --no-reuse-object if you want to force a uniform compression level
	   on all data no matter the source.

	   Create a "thin" pack by omitting the common objects between a
	   sender and a receiver in order to reduce network transfer. This
	   option only makes sense in conjunction with --stdout.

	   Note: A thin pack violates the packed archive format by omitting
	   required objects and is thus unusable by Git without making it
	   self-contained. Use git index-pack --fix-thin (see git-index-
	   pack(1)) to restore the self-contained property.

	   A packed archive can express the base object of a delta as either a
	   20-byte object name or as an offset in the stream, but ancient
	   versions of Git don’t understand the latter. By default, git
	   pack-objects only uses the former format for better compatibility.
	   This option allows the command to use the latter format for
	   compactness. Depending on the average delta chain length, this
	   option typically shrinks the resulting packfile by 3-5 per-cent.

	   Note: Porcelain commands such as git gc (see git-gc(1)), git repack
	   (see git-repack(1)) pass this option by default in modern Git when
	   they put objects in your repository into pack files. So does git
	   bundle (see git-bundle(1)) when it creates a bundle.

	   Specifies the number of threads to spawn when searching for best
	   delta matches. This requires that pack-objects be compiled with
	   pthreads otherwise this option is ignored with a warning. This is
	   meant to reduce packing time on multiprocessor machines. The
	   required amount of memory for the delta search window is however
	   multiplied by the number of threads. Specifying 0 will cause Git to
	   auto-detect the number of CPU’s and set the number of threads

	   This is intended to be used by the test suite only. It allows to
	   force the version for the generated pack index, and to force 64-bit
	   index entries on objects located above the given offset.

	   With this option, parents that are hidden by grafts are packed

       git-rev-list(1) git-repack(1) git-prune-packed(1)

       Part of the git(1) suite

Git 1.9.0			  04/22/2014		   GIT-PACK-OBJECTS(1)

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