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Linux 2.6 - man page for git-pack-objects (linux section 1)

GIT-PACK-OBJECTS(1)			    Git Manual			      GIT-PACK-OBJECTS(1)

       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 of the sorted object names to
	   make the resulting filename based on the pack content, and 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 default.

	   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

	   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 packed.

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

	   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

	   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

	   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 accordingly.

	   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 nevertheless.

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

       Part of the git(1) suite

Git				    01/14/2014			      GIT-PACK-OBJECTS(1)

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