git/Documentation/git-submodule.adoc

git-submodule(1)
================

NAME
----
git-submodule - Initialize, update or inspect submodules


SYNOPSIS
--------
[synopsis]
git submodule [--quiet] [--cached]
git submodule [--quiet] add [<options>] [--] <repository> [<path>]
git submodule [--quiet] status [--cached] [--recursive] [--] [<path>...]
git submodule [--quiet] init [--] [<path>...]
git submodule [--quiet] deinit [-f|--force] (--all|[--] <path>...)
git submodule [--quiet] update [<options>] [--] [<path>...]
git submodule [--quiet] set-branch [<options>] [--] <path>
git submodule [--quiet] set-url [--] <path> <newurl>
git submodule [--quiet] summary [<options>] [--] [<path>...]
git submodule [--quiet] foreach [--recursive] <command>
git submodule [--quiet] sync [--recursive] [--] [<path>...]
git submodule [--quiet] absorbgitdirs [--] [<path>...]


DESCRIPTION
-----------
Inspects, updates and manages submodules.

For more information about submodules, see linkgit:gitsubmodules[7].

COMMANDS
--------
With no arguments, shows the status of existing submodules.  Several
subcommands are available to perform operations on the submodules.

`add [-b <branch>] [-f | --force] [--name <name>] [--reference <repository>] [--ref-format <format>] [--depth <depth>] [--] <repository> [<path>]`::
	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".
+
_<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 default remote
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).
+
The default remote is the remote of the remote-tracking branch
of the current branch. If no such remote-tracking branch exists or
the HEAD is detached, "origin" is assumed to be the default remote.
If the superproject doesn't have a default remote configured
the superproject is its own authoritative upstream and the current
working directory is used instead.
+
The optional argument _<path>_ is the relative location for the cloned
submodule to exist in the superproject. If _<path>_ is not given, the
canonical part of the source repository is used (`repo` for
`/path/to/repo.git` and `foo` for `host.xz:foo/.git`). If _<path>_
exists and is already a valid Git repository, then it is staged
for commit without cloning. The _<path>_ is also used as the submodule's
logical name in its configuration entries unless `--name <name>` is used
to specify a logical name.
+
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`.
+
If `--ref-format <format>`  is specified, the ref storage format of newly
cloned submodules will be set accordingly.

`status [--cached] [--recursive] [--] [<path>...]`::
	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 possibly 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.
+
If `--cached` is specified, this command will instead print the SHA-1
recorded in the superproject for each 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,
linkgit:git-status[1] and linkgit:git-diff[1] will provide that information
too (and can also report changes to a submodule's work tree).

`init [--] [<path>...]`::
	Initialize the submodules recorded in the index (which were
	added and committed elsewhere) by setting `submodule.$name.url`
	in `.git/config`, using the same setting from `.gitmodules` as
	a template. If the URL is relative, it will be resolved using
	the default remote. If there is no default remote, the current
	repository will be assumed to be upstream.
+
Optional _<path>_ arguments limit which submodules will be initialized.
If no path is specified and submodule.active has been configured, submodules
configured to be active will be initialized, otherwise all submodules are
initialized.
+
It will also copy the value of `submodule.$name.update`, if present in
the `.gitmodules` file, to `.git/config`, but (1) this command does not
alter existing information in `.git/config`, and (2) `submodule.$name.update`
that is set to a custom command is *not* copied for security reasons.
+
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.
+
See the add subcommand for the definition of default remote.

`deinit [-f | --force] (--all|[--] <path>...)`::
	Unregister the given submodules, i.e. remove the whole
	`submodule.$name` section from .git/config together with their work
	tree. Further calls to `git submodule update`, `git submodule foreach`
	and `git submodule sync` will skip any unregistered submodules until
	they are initialized again, so use this command if you don't want to
	have a local checkout of the submodule in your working tree anymore.
+
When the command is run without pathspec, it errors out,
instead of deinit-ing everything, to prevent mistakes.
+
If `--force` is specified, the submodule's working tree will
be removed even if it contains local modifications.
+
If you really want to remove a submodule from the repository and commit
that use linkgit:git-rm[1] instead. See linkgit:gitsubmodules[7] for removal
options.

`update [--init] [--remote] [-N | --no-fetch] [--[no-]recommend-shallow] [-f | --force] [--checkout | --rebase | --merge] [--reference <repository>] [--ref-format <format>] [--depth <depth>] [--recursive] [--jobs <n>] [--[no-]single-branch] [--filter <filter-spec>] [--] [<path>...]`::
+
--
Update the registered submodules to match what the superproject
expects by cloning missing submodules, fetching missing commits
in submodules and updating the working tree of
the submodules. The "updating" can be done in several ways depending
on command line options and the value of `submodule.<name>.update`
configuration variable. The command line option takes precedence over
the configuration variable. If neither is given, a `checkout` is performed.
(note: what is in `.gitmodules` file is irrelevant at this point;
see `git submodule init` above for how `.gitmodules` is used).
The `update` procedures supported both from the command line as well as
through the `submodule.<name>.update` configuration are:

`checkout`;; the commit recorded in the superproject will be
checked out in the submodule on a detached HEAD.
+
If `--force` is specified, the submodule will be checked out (using
`git checkout --force`), even if the commit specified
in the index of the containing repository already matches the commit
checked out in the submodule.

`rebase`;; the current branch of the submodule will be rebased
onto the commit recorded in the superproject.

`merge`;; the commit recorded in the superproject will be merged
into the current branch in the submodule.

The following update procedures have additional limitations:

`!<custom-command>`;; mechanism for running arbitrary commands with the
commit ID as an argument. Specifically, if the
`submodule.<name>.update` configuration variable is set to
`!<custom-command>`, the object name of the commit recorded in the
superproject for the submodule is appended to the _<custom-command>_
string and executed. Note that this mechanism is not supported in
the `.gitmodules` file or on the command line.

`none`;; the submodule is not updated. This update procedure is not
allowed on the command line.

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 `--ref-format <format>`  is specified, the ref storage format of newly
cloned submodules will be set accordingly.

If `--filter <filter-spec>` is specified, the given partial clone filter will be
applied to the submodule. See linkgit:git-rev-list[1] for details on filter
specifications.
--
`set-branch (-b|--branch) <branch> [--] <path>`::
`set-branch (-d|--default) [--] <path>`::
	Set the default remote tracking branch for the submodule. The
	`--branch` option allows the remote branch to be specified. The
	`--default` option removes the `submodule.<name>.branch` configuration
	key, which causes the tracking branch to default to the remote `HEAD`.

`set-url [--] <path> <newurl>`::
	Set the URL of the specified submodule to _<newurl>_. Then, it will
	automatically synchronize the submodule's new remote URL
	configuration.

`summary [--cached | --files] [(-n|--summary-limit) <n>] [commit] [--] [<path>...]`::
	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 linkgit:git-diff[1] will provide that
information too.

`foreach [--recursive] <command>`::
	Evaluate an arbitrary shell _<command>_ in each checked out submodule.
	The command has access to the variables `$name`, `$sm_path`, `$displaypath`,
	`$sha1` and `$toplevel`:
+
--
`$name`;; the name of the relevant submodule section in `.gitmodules`
`$sm_path`;; the path of the submodule as recorded in the immediate
	superproject
`$displaypath`;; the relative path from the
	current working directory to the submodules root directory
`$sha1`;; the commit as recorded in the immediate superproject
`$toplevel`;; the absolute path to the top-level of the immediate superproject.
--
+
Note that to avoid conflicts with `$PATH` on Windows, the `$path`
variable is now a deprecated synonym of `$sm_path` variable.
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, the command below will show the path and currently
checked out commit for each submodule:
+
--------------
git submodule foreach 'echo $sm_path `git rev-parse HEAD`'
--------------

`sync [--recursive] [--] [<path>...]`::
	Synchronize submodules' remote URL configuration setting
	to the value specified in `.gitmodules`. It will only affect those
	submodules which already have a 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.
+
If `--recursive` is specified, this command will recurse into the
registered submodules, and sync any nested submodules within.

`absorbgitdirs`::
	If a git directory of a submodule is inside the submodule,
	move the git directory of the submodule into its superproject's
	`$GIT_DIR/modules` path and then connect the git directory and
	its working directory by setting the `core.worktree` and adding
	a `.git` file pointing to the git directory embedded in the
	superprojects git directory.
+
A repository that was cloned independently and later added as a submodule or
old setups have the submodules git directory inside the submodule instead of
embedded into the superprojects git directory.
+
This command is recursive by default.

OPTIONS
-------
`-q`::
`--quiet`::
	Only print error messages.

`--progress`::
	Report progress status on the standard error stream
	by default when it is attached to a terminal, unless `-q`
	is specified. This flag forces progress status even if the
	standard error stream is not directed to a terminal. It is
	only valid for `add` and `update` commands.

`--all`::
	Unregister all submodules in the working tree. This option is only
	valid for the `deinit` command.

`-b <branch>`::
`--branch <branch>`::
	Branch of repository to add as submodule.
	The name of the branch is recorded as `submodule.<name>.branch` in
	`.gitmodules` for `update --remote`.  A special value of `.` is used to
	indicate that the name of the branch in the submodule should be the
	same name as the current branch in the current repository.  If the
	option is not specified, it defaults to the remote `HEAD`.

`-f`::
`--force`::
	Force the command to proceed, even if it would otherwise fail.
	This option is only valid for `add`, `deinit` and `update` commands.
`add`;; allow adding an otherwise ignored submodule path.
This option is also used to bypass a check that the submodule's name
is not already in use. By default, `git submodule add` will fail if
the proposed name (which is derived from the path) is already registered
for another submodule in the repository. Using `--force` allows the command
to proceed by automatically generating a unique name by appending a number
to the conflicting name (e.g., if a submodule named 'child' exists, it will
try 'child1', and so on).
`deinit`;; the submodule working trees will be removed even
if they contain local changes.
`update`;; (only effective with the checkout procedure),
throw away local changes in submodules when switching to a
different commit; and always run a checkout operation in the
submodule, even if the commit listed in the index of the
containing repository matches the commit checked out in the
submodule.

`--cached`::
	Use the index to determine the commit instead of the `HEAD`.
	This option is only valid for `status` and `summary` commands.

`--files`::
	Make the `summary` command compare the commit in the index with that in
	the submodule `HEAD`.

`-n <n>`::
`--summary-limit <n>`::
	Limit the `summary` size (number of commits shown in total) to _<n>_.
	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.

`--remote`::
	Instead of using the superproject's recorded SHA-1 to update the
	submodule, use the status of the submodule's remote-tracking branch.
	This option is only valid for the `update` command. The remote used
	is branch's remote (`branch.<name>.remote`), defaulting to `origin`.
	The remote branch used defaults to the remote `HEAD`, but the branch
	name may be overridden by setting the `submodule.<name>.branch`
	option in either `.gitmodules` or `.git/config` (with `.git/config`
	taking precedence).
+
This works for any of the supported update procedures (`--checkout`,
`--rebase`, etc.).  The only change is the source of the target SHA-1.
For example, `submodule update --remote --merge` will merge upstream
submodule changes into the submodules, while `submodule update
--merge` will merge superproject gitlink changes into the submodules.
+
In order to ensure a current tracking branch state, `update --remote`
fetches the submodule's remote repository before calculating the
SHA-1.  If you don't want to fetch, you should use `submodule update
--remote --no-fetch`.
+
Use this option to integrate changes from the upstream subproject with
your submodule's current `HEAD`.  Alternatively, you can run `git pull`
from the submodule, which is equivalent except for the remote branch
name: `update --remote` uses the default upstream repository and
`submodule.<name>.branch`, while `git pull` uses the submodule's
`branch.<name>.merge`.  Prefer `submodule.<name>.branch` if you want
to distribute the default upstream branch with the superproject and
`branch.<name>.merge` if you want a more native feel while working in
the submodule itself.

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

`--checkout`::
	This option is only valid for the `update` command.
	Checkout the commit recorded in the superproject on a detached `HEAD`
	in the submodule. This is the default behavior, the main use of
	this option is to override `submodule.<name>.update` when set to
	a value other than `checkout`.
	If the key `submodule.<name>.update` is either not explicitly set or
	set to `checkout`, this option is implicit.

`--merge`::
	Merge the commit recorded in the superproject into the current branch
	of the submodule. This option is only valid for the `update` command.
	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 linkgit:git-rebase[1].
	If the key `submodule.<name>.update` is set to `rebase`, this option is
	implicit.

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


`--name <name>`::
	Set the submodule's name to the given string instead of defaulting to its path. _<name>_
	must be valid as a directory name and may not end with a '/'.

`--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 linkgit:git-clone[1] command.
+
*NOTE*: Do *not* use this option unless you have read the note
for linkgit:git-clone[1]'s `--reference`, `--shared`, and `--dissociate`
options carefully.

`--dissociate`::
	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 linkgit:git-clone[1] command.
+
*NOTE*: see the NOTE above for the `--reference` option.

`--recursive`::
	Traverse submodules recursively. This option is only valid for `foreach`,
	`update`, `status` and `sync` commands. 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).

`--depth <depth>`::
	Create a 'shallow' clone with a history truncated to the _<depth>_ revisions.
	This option is valid for `add` and `update` commands. See linkgit:git-clone[1]

`--recommend-shallow`::
`--no-recommend-shallow`::
	This option is only valid for the `update` command.
	The initial clone of a submodule will use the recommended
	`submodule.<name>.shallow` as provided by the `.gitmodules` file
	by default. To ignore the suggestions use `--no-recommend-shallow`.

`-j <n>`::
`--jobs <n>`::
	Clone new submodules in parallel with _<n>_ jobs.
	This option is only valid for the `update` command.
	Defaults to the `submodule.fetchJobs` option.

`--single-branch`::
`--no-single-branch`::
	Clone only one branch during update: `HEAD` or one specified by `--branch`.
	This option is only valid for the `update` command.

`<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 linkgit:gitmodules[5]
for details.

SEE ALSO
--------
linkgit:gitsubmodules[7], linkgit:gitmodules[5].

GIT
---
Part of the linkgit:git[1] suite