NAME

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

SYNOPSIS

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

DESCRIPTION

       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.

OPTIONS

       -v
           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 .pack).

       --stdin
           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-thin
           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.

       --keep
           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.

       --keep=<msg>
           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.

       --index-version=<version>[,<offset>]
           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.

       --strict
           Die, if the pack contains broken objects or links.

       --check-self-contained-and-connected
           Die if the pack contains broken links. For internal use only.

       --fsck-objects
           Die if the pack contains broken objects. For internal use only.

       --threads=<n>
           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.

       --max-input-size=<size>
           Die, if the pack is larger than <size>.

NOTE

       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.

GIT

       Part of the git(1) suite