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git-index-pack - Build pack index file for an existing packed archive


git index-pack [-v] [-o <index-file>] <pack-file>
git index-pack --stdin [--fix-thin] [--keep] [-v] [-o <index-file>]


Reads a packed archive (.pack) from the specified file, and builds a pack index file
(.idx) for it. The packed archive together with the pack index can then be placed in the
objects/pack/ directory of a Git repository.


Be verbose about what is going on, including progress status.

-o <index-file>
Write the generated pack index into the specified file. Without this option the name
of pack index file is constructed from the name of packed archive file by replacing
.pack with .idx (and the program fails if the name of packed archive does not end with

When this flag is provided, the pack is read from stdin instead and a copy is then
written to <pack-file>. If <pack-file> is not specified, the pack is written to
objects/pack/ directory of the current Git repository with a default name determined
from the pack content. If <pack-file> is not specified consider using --keep to
prevent a race condition between this process and git repack.

Fix a "thin" pack produced by git pack-objects --thin (see git-pack-objects(1) for
details) by adding the excluded objects the deltified objects are based on to the
pack. This option only makes sense in conjunction with --stdin.

Before moving the index into its final destination create an empty .keep file for the
associated pack file. This option is usually necessary with --stdin to prevent a
simultaneous git repack process from deleting the newly constructed pack and index
before refs can be updated to use objects contained in the pack.

Like --keep create a .keep file before moving the index into its final destination,
but rather than creating an empty file place <msg> followed by an LF into the .keep
file. The <msg> message can later be searched for within all .keep files to locate any
which have outlived their usefulness.

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.

Die, if the pack contains broken objects or links.

Die if the pack contains broken links. For internal use only.

Specifies the number of threads to spawn when resolving deltas. This requires that
index-pack 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 use maximum 3


Once the index has been created, the list of object names is sorted and the SHA-1 hash of
that list is printed to stdout. If --stdin was also used then this is prefixed by either
"pack\t", or "keep\t" if a new .keep file was successfully created. This is useful to
remove a .keep file used as a lock to prevent the race with git repack mentioned above.


Part of the git(1) suite

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