NAME

       git-commit-graph - Write and verify Git commit-graph files

SYNOPSIS

       git commit-graph verify [--object-dir <dir>] [--shallow] [--[no-]progress]
       git commit-graph write [--object-dir <dir>] [--append]
                               [--split[=<strategy>]] [--reachable | --stdin-packs | --stdin-commits]
                               [--changed-paths] [--[no-]max-new-filters <n>] [--[no-]progress]
                               <split options>

DESCRIPTION

       Manage the serialized commit-graph file.

OPTIONS

       --object-dir
           Use given directory for the location of packfiles and commit-graph file. This parameter exists to
           specify the location of an alternate that only has the objects directory, not a full .git directory.
           The commit-graph file is expected to be in the <dir>/info directory and the packfiles are expected to
           be in <dir>/pack. If the directory could not be made into an absolute path, or does not match any
           known object directory, git commit-graph ...  will exit with non-zero status.

       --[no-]progress
           Turn progress on/off explicitly. If neither is specified, progress is shown if standard error is
           connected to a terminal.

COMMANDS

       write
           Write a commit-graph file based on the commits found in packfiles. If the config option
           core.commitGraph is disabled, then this command will output a warning, then return success without
           writing a commit-graph file.

           With the --stdin-packs option, generate the new commit graph by walking objects only in the specified
           pack-indexes. (Cannot be combined with --stdin-commits or --reachable.)

           With the --stdin-commits option, generate the new commit graph by walking commits starting at the
           commits specified in stdin as a list of OIDs in hex, one OID per line. OIDs that resolve to
           non-commits (either directly, or by peeling tags) are silently ignored. OIDs that are malformed, or
           do not exist generate an error. (Cannot be combined with --stdin-packs or --reachable.)

           With the --reachable option, generate the new commit graph by walking commits starting at all refs.
           (Cannot be combined with --stdin-commits or --stdin-packs.)

           With the --append option, include all commits that are present in the existing commit-graph file.

           With the --changed-paths option, compute and write information about the paths changed between a
           commit and its first parent. This operation can take a while on large repositories. It provides
           significant performance gains for getting history of a directory or a file with git log -- <path>. If
           this option is given, future commit-graph writes will automatically assume that this option was
           intended. Use --no-changed-paths to stop storing this data.

           With the --max-new-filters=<n> option, generate at most n new Bloom filters (if --changed-paths is
           specified). If n is -1, no limit is enforced. Only commits present in the new layer count against
           this limit. To retroactively compute Bloom filters over earlier layers, it is advised to use
           --split=replace. Overrides the commitGraph.maxNewFilters configuration.

           With the --split[=<strategy>] option, write the commit-graph as a chain of multiple commit-graph
           files stored in <dir>/info/commit-graphs. Commit-graph layers are merged based on the strategy and
           other splitting options. The new commits not already in the commit-graph are added in a new "tip"
           file. This file is merged with the existing file if the following merge conditions are met:

           •   If --split=no-merge is specified, a merge is never performed, and the remaining options are
               ignored.  --split=replace overwrites the existing chain with a new one. A bare --split defers to
               the remaining options. (Note that merging a chain of commit graphs replaces the existing chain
               with a length-1 chain where the first and only incremental holds the entire graph).

           •   If --size-multiple=<X> is not specified, let X equal 2. If the new tip file would have N commits
               and the previous tip has M commits and X times N is greater than M, instead merge the two files
               into a single file.

           •   If --max-commits=<M> is specified with M a positive integer, and the new tip file would have more
               than M commits, then instead merge the new tip with the previous tip.

               Finally, if --expire-time=<datetime> is not specified, let datetime be the current time. After
               writing the split commit-graph, delete all unused commit-graph whose modified times are older
               than datetime.

       verify
           Read the commit-graph file and verify its contents against the object database. Used to check for
           corrupted data.

           With the --shallow option, only check the tip commit-graph file in a chain of split commit-graphs.

EXAMPLES

       •   Write a commit-graph file for the packed commits in your local .git directory.

               $ git commit-graph write

       •   Write a commit-graph file, extending the current commit-graph file using commits in <pack-index>.

               $ echo <pack-index> | git commit-graph write --stdin-packs

       •   Write a commit-graph file containing all reachable commits.

               $ git show-ref -s | git commit-graph write --stdin-commits

       •   Write a commit-graph file containing all commits in the current commit-graph file along with those
           reachable from HEAD.

               $ git rev-parse HEAD | git commit-graph write --stdin-commits --append

CONFIGURATION

       Everything below this line in this section is selectively included from the git-config(1) documentation.
       The content is the same as what’s found there:

       commitGraph.generationVersion
           Specifies the type of generation number version to use when writing or reading the commit-graph file.
           If version 1 is specified, then the corrected commit dates will not be written or read. Defaults to
           2.

       commitGraph.maxNewFilters
           Specifies the default value for the --max-new-filters option of git commit-graph write (c.f., git-
           commit-graph(1)).

       commitGraph.readChangedPaths
           If true, then git will use the changed-path Bloom filters in the commit-graph file (if it exists, and
           they are present). Defaults to true. See git-commit-graph(1) for more information.

FILE FORMAT

       see gitformat-commit-graph(5).

GIT

       Part of the git(1) suite

Git 2.43.0                                         07/02/2025                                GIT-COMMIT-GRAPH(1)