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NAME

       git-submodule - Initialize, update or inspect submodules

SYNOPSIS

       git submodule [--quiet] add [-b branch] [-f|--force]
                     [--reference <repository>] [--] <repository> [<path>]
       git submodule [--quiet] status [--cached] [--recursive] [--] [<path>...]
       git submodule [--quiet] init [--] [<path>...]
       git submodule [--quiet] update [--init] [-N|--no-fetch] [--rebase]
                     [--reference <repository>] [--merge] [--recursive] [--] [<path>...]
       git submodule [--quiet] summary [--cached|--files] [(-n|--summary-limit) <n>]
                     [commit] [--] [<path>...]
       git submodule [--quiet] foreach [--recursive] <command>
       git submodule [--quiet] sync [--] [<path>...]

DESCRIPTION

       Submodules allow foreign repositories to be embedded within a dedicated subdirectory of
       the source tree, always pointed at a particular commit.

       They are not to be confused with remotes, which are meant mainly for branches of the same
       project; submodules are meant for different projects you would like to make part of your
       source tree, while the history of the two projects still stays completely independent and
       you cannot modify the contents of the submodule from within the main project. If you want
       to merge the project histories and want to treat the aggregated whole as a single project
       from then on, you may want to add a remote for the other project and use the subtree merge
       strategy, instead of treating the other project as a submodule. Directories that come from
       both projects can be cloned and checked out as a whole if you choose to go that route.

       Submodules are composed from a so-called gitlink tree entry in the main repository that
       refers to a particular commit object within the inner repository that is completely
       separate. A record in the .gitmodules file at the root of the source tree assigns a
       logical name to the submodule and describes the default URL the submodule shall be cloned
       from. The logical name can be used for overriding this URL within your local repository
       configuration (see submodule init).

       This command will manage the tree entries and contents of the gitmodules file for you, as
       well as inspect the status of your submodules and update them. When adding a new submodule
       to the tree, the add subcommand is to be used. However, when pulling a tree containing
       submodules, these will not be checked out by default; the init and update subcommands will
       maintain submodules checked out and at appropriate revision in your working tree. You can
       briefly inspect the up-to-date status of your submodules using the status subcommand and
       get a detailed overview of the difference between the index and checkouts using the
       summary subcommand.

COMMANDS

       add
           Add the given repository as a submodule at the given path to the changeset to be
           committed next to the current project: the current project is termed the
           "superproject".

           This requires at least one argument: <repository>. The optional argument <path> is the
           relative location for the cloned submodule to exist in the superproject. If <path> is
           not given, the "humanish" part of the source repository is used ("repo" for
           "/path/to/repo.git" and "foo" for "host.xz:foo/.git").

           <repository> is the URL of the new submodule’s origin repository. This may be either
           an absolute URL, or (if it begins with ./ or ../), the location relative to the
           superproject’s origin repository (Please note that to specify a repository foo.git
           which is located right next to a superproject bar.git, you’ll have to use ../foo.git
           instead of ./foo.git - as one might expect when following the rules for relative URLs
           - because the evaluation of relative URLs in Git is identical to that of relative
           directories). If the superproject doesn’t have an origin configured the superproject
           is its own authoritative upstream and the current working directory is used instead.

           <path> is the relative location for the cloned submodule to exist in the superproject.
           If <path> does not exist, then the submodule is created by cloning from the named URL.
           If <path> does exist and is already a valid git repository, then this is added to the
           changeset without cloning. This second form is provided to ease creating a new
           submodule from scratch, and presumes the user will later push the submodule to the
           given URL.

           In either case, the given URL is recorded into .gitmodules for use by subsequent users
           cloning the superproject. If the URL is given relative to the superproject’s
           repository, the presumption is the superproject and submodule repositories will be
           kept together in the same relative location, and only the superproject’s URL needs to
           be provided: git-submodule will correctly locate the submodule using the relative URL
           in .gitmodules.

       status
           Show the status of the submodules. This will print the SHA-1 of the currently checked
           out commit for each submodule, along with the submodule path and the output of git
           describe for the SHA-1. Each SHA-1 will be prefixed with - if the submodule is not
           initialized, + if the currently checked out submodule commit does not match the SHA-1
           found in the index of the containing repository and U if the submodule has merge
           conflicts. This command is the default command for git submodule.

           If --recursive is specified, this command will recurse into nested submodules, and
           show their status as well.

           If you are only interested in changes of the currently initialized submodules with
           respect to the commit recorded in the index or the HEAD, git-status(1) and git-diff(1)
           will provide that information too (and can also report changes to a submodule’s work
           tree).

       init
           Initialize the submodules, i.e. register each submodule name and url found in
           .gitmodules into .git/config. It will also copy the value of submodule.$name.update
           into .git/config. The key used in .git/config is submodule.$name.url. This command
           does not alter existing information in .git/config. You can then customize the
           submodule clone URLs in .git/config for your local setup and proceed to git submodule
           update; you can also just use git submodule update --init without the explicit init
           step if you do not intend to customize any submodule locations.

       update
           Update the registered submodules, i.e. clone missing submodules and checkout the
           commit specified in the index of the containing repository. This will make the
           submodules HEAD be detached unless --rebase or --merge is specified or the key
           submodule.$name.update is set to rebase, merge or none.

           If the submodule is not yet initialized, and you just want to use the setting as
           stored in .gitmodules, you can automatically initialize the submodule with the --init
           option.

           If --recursive is specified, this command will recurse into the registered submodules,
           and update any nested submodules within.

           If the configuration key submodule.$name.update is set to none the submodule with name
           $name will not be updated by default. This can be overriden by adding --checkout to
           the command.

       summary
           Show commit summary between the given commit (defaults to HEAD) and working
           tree/index. For a submodule in question, a series of commits in the submodule between
           the given super project commit and the index or working tree (switched by --cached)
           are shown. If the option --files is given, show the series of commits in the submodule
           between the index of the super project and the working tree of the submodule (this
           option doesn’t allow to use the --cached option or to provide an explicit commit).

           Using the --submodule=log option with git-diff(1) will provide that information too.

       foreach
           Evaluates an arbitrary shell command in each checked out submodule. The command has
           access to the variables $name, $path, $sha1 and $toplevel: $name is the name of the
           relevant submodule section in .gitmodules, $path is the name of the submodule
           directory relative to the superproject, $sha1 is the commit as recorded in the
           superproject, and $toplevel is the absolute path to the top-level of the superproject.
           Any submodules defined in the superproject but not checked out are ignored by this
           command. Unless given --quiet, foreach prints the name of each submodule before
           evaluating the command. If --recursive is given, submodules are traversed recursively
           (i.e. the given shell command is evaluated in nested submodules as well). A non-zero
           return from the command in any submodule causes the processing to terminate. This can
           be overridden by adding || : to the end of the command.

           As an example, git submodule foreach 'echo $path `git rev-parse HEAD`' will show the
           path and currently checked out commit for each submodule.

       sync
           Synchronizes submodules' remote URL configuration setting to the value specified in
           .gitmodules. It will only affect those submodules which already have an url entry in
           .git/config (that is the case when they are initialized or freshly added). This is
           useful when submodule URLs change upstream and you need to update your local
           repositories accordingly.

           "git submodule sync" synchronizes all submodules while "git submodule sync -- A"
           synchronizes submodule "A" only.

OPTIONS

       -q, --quiet
           Only print error messages.

       -b, --branch
           Branch of repository to add as submodule.

       -f, --force
           This option is only valid for add and update commands. When running add, allow adding
           an otherwise ignored submodule path. When running update, throw away local changes in
           submodules when switching to a different commit.

       --cached
           This option is only valid for status and summary commands. These commands typically
           use the commit found in the submodule HEAD, but with this option, the commit stored in
           the index is used instead.

       --files
           This option is only valid for the summary command. This command compares the commit in
           the index with that in the submodule HEAD when this option is used.

       -n, --summary-limit
           This option is only valid for the summary command. Limit the summary size (number of
           commits shown in total). Giving 0 will disable the summary; a negative number means
           unlimited (the default). This limit only applies to modified submodules. The size is
           always limited to 1 for added/deleted/typechanged submodules.

       -N, --no-fetch
           This option is only valid for the update command. Don’t fetch new objects from the
           remote site.

       --merge
           This option is only valid for the update command. Merge the commit recorded in the
           superproject into the current branch of the submodule. If this option is given, the
           submodule’s HEAD will not be detached. If a merge failure prevents this process, you
           will have to resolve the resulting conflicts within the submodule with the usual
           conflict resolution tools. If the key submodule.$name.update is set to merge, this
           option is implicit.

       --rebase
           This option is only valid for the update command. Rebase the current branch onto the
           commit recorded in the superproject. If this option is given, the submodule’s HEAD
           will not be detached. If a merge failure prevents this process, you will have to
           resolve these failures with git-rebase(1). If the key submodule.$name.update is set to
           rebase, this option is implicit.

       --init
           This option is only valid for the update command. Initialize all submodules for which
           "git submodule init" has not been called so far before updating.

       --reference <repository>
           This option is only valid for add and update commands. These commands sometimes need
           to clone a remote repository. In this case, this option will be passed to the git-
           clone(1) command.

           NOTE: Do not use this option unless you have read the note for git-clone(1)'s
           --reference and --shared options carefully.

       --recursive
           This option is only valid for foreach, update and status commands. Traverse submodules
           recursively. The operation is performed not only in the submodules of the current
           repo, but also in any nested submodules inside those submodules (and so on).

       <path>...
           Paths to submodule(s). When specified this will restrict the command to only operate
           on the submodules found at the specified paths. (This argument is required with add).

FILES

       When initializing submodules, a .gitmodules file in the top-level directory of the
       containing repository is used to find the url of each submodule. This file should be
       formatted in the same way as $GIT_DIR/config. The key to each submodule url is
       "submodule.$name.url". See gitmodules(5) for details.

GIT

       Part of the git(1) suite