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Updated: Wednesday, July 27, 2022

git-index-pack (1)


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


git index-pack [-v] [-o <index-file>] [--[no-]rev-index] <pack-file>
git index-pack --stdin [--fix-thin] [--keep] [-v] [-o <index-file>]
[--[no-]rev-index] [<pack-file>]


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

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

       git index-pack [-v] [-o <index-file>] [--[no-]rev-index] <pack-file>
       git index-pack --stdin [--fix-thin] [--keep] [-v] [-o <index-file>]
                         [--[no-]rev-index] [<pack-file>]

       Reads a packed archive (.pack) from the specified file, and builds a
       pack index file (.idx) for it. Optionally writes a reverse-index (.rev)
       for the specified pack. 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, generate a reverse index (a .rev file)
           corresponding to the given pack. If --verify is given, ensure that
           the existing reverse index is correct. Takes precedence over

           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.

           For internal use only.

           Set the title of the progress bar. The title is "Receiving objects"
           by default and "Indexing objects" when --stdin is specified.

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

           For internal use only.

           Die if the pack contains broken objects. If the pack contains a
           tree pointing to a .gitmodules blob that does not exist, prints the
           hash of that blob (for the caller to check) after the hash that
           goes into the name of the pack/idx file (see "Notes").

           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 threads.

           Die, if the pack is larger than <size>.

           Specify the given object format (hash algorithm) for the pack. The
           valid values are sha1 and (if enabled) sha256. The default is the
           algorithm for the current repository (set by
           extensions.objectFormat), or sha1 if no value is set or outside a

           This option cannot be used with --stdin.

           THIS OPTION IS EXPERIMENTAL! SHA-256 support is experimental and
           still in an early stage. A SHA-256 repository will in general not
           be able to share work with "regular" SHA-1 repositories. It should
           be assumed that, e.g., Git internal file formats in relation to
           SHA-256 repositories may change in backwards-incompatible ways.
           Only use --object-format=sha256 for testing purposes.

           Before committing the pack-index, create a .promisor file for this
           pack. Particularly helpful when writing a promisor pack with
           --fix-thin since the name of the pack is not final until the pack
           has been fully written. If a <message> is provided, then that
           content will be written to the .promisor file for future reference.
           See partial clone[1] for more information.

       Once the index has been created, the hash that goes into the name of
       the pack/idx file 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

        1. partial clone

Git 2.36.0                        04/17/2022                 GIT-INDEX-PACK(1)