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>] <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 .pack).

           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.

           Die if the pack contains broken objects. 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 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.

       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

Git 2.30.0                         12/28/2020                  GIT-INDEX-PACK(1)