05eb811aa1
* np/pack: add the capability for index-pack to read from a stream index-pack: compare only the first 20-bytes of the key. git-repack: repo.usedeltabaseoffset pack-objects: document --delta-base-offset option allow delta data reuse even if base object is a preferred base zap a debug remnant let the GIT native protocol use offsets to delta base when possible make pack data reuse compatible with both delta types make git-pack-objects able to create deltas with offset to base teach git-index-pack about deltas with offset to base teach git-unpack-objects about deltas with offset to base introduce delta objects with offset to base
144 lines
4.6 KiB
Plaintext
144 lines
4.6 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] [--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] < 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 set of objects
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between two repositories, and also is an archival format which
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is efficient to access. The packed archive format (.pack) is
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designed to be unpackable without having anything else, but for
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random access, accompanied with the pack index file (.idx).
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'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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Placing both 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 such an archive.
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In a packed archive, an object is either stored as a compressed
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whole, or as a difference from some other object. The latter is
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often called a delta.
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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>-<SHA1>.{pack,idx} files. <SHA1> is a hash
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of object names (currently in random order so it does
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not have any useful meaning) to make the resulting
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filename reasonably unique, and 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 gitlink:git-rev-list[1] with `--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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--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 `$GIT_DIR/refs` are specified to be
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included.
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--window=[N], --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 both --window and --depth is 10.
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--incremental::
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This flag causes an object already in a pack ignored
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even if it appears in the standard input.
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--local::
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This flag is similar to `--incremental`; instead of
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ignoring all packed objects, it only ignores objects
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that are packed and not in the local object store
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(i.e. borrowed from an alternate).
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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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-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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--delta-base-offset::
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A packed archive can express base object of a delta as
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either 20-byte object name or as an offset in the
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stream, but older version of git does not 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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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org>
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Documentation
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-------------
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Documentation by Junio C Hamano
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See Also
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--------
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gitlink:git-rev-list[1]
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gitlink:git-repack[1]
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gitlink:git-prune-packed[1]
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GIT
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---
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Part of the gitlink:git[7] suite
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