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diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt new file mode 100644 index 0000000000..63aa694968 --- /dev/null +++ b/Documentation/git-submodule.txt @@ -0,0 +1,260 @@ +git-submodule(1) +================ + +NAME +---- +git-submodule - Initialize, update or inspect submodules + + +SYNOPSIS +-------- +[verse] +'git submodule' [--quiet] add [-b branch] + [--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] [--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. ++ +<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 and `+` if the currently checked out submodule commit + does not match the SHA-1 found in the index of the containing + repository. 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. + +init:: + Initialize the submodules, i.e. register each submodule name + and url found in .gitmodules 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` or `merge`. ++ +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. + +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). + +foreach:: + Evaluates an arbitrary shell command in each checked out submodule. + The command has access to the variables $name, $path and $sha1: + $name is the name of the relevant submodule section in .gitmodules, + $path is the name of the submodule directory relative to the + superproject, and $sha1 is the commit as recorded in 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 $path {backtick}git +rev-parse HEAD{backtick}'+ will show the path and currently checked out +commit for each submodule. + +sync:: + Synchronizes submodules' remote URL configuration setting + to the value specified in .gitmodules. This is useful when + submodule URLs change upstream and you need to update your local + repositories accordingly. ++ +"git submodule sync" synchronizes all submodules while +"git submodule sync -- A" synchronizes submodule "A" only. + +OPTIONS +------- +-q:: +--quiet:: + Only print error messages. + +-b:: +--branch:: + Branch of repository to add as submodule. + +--cached:: + This option is only valid for status and summary commands. These + commands typically use the commit found in the submodule HEAD, but + with this option, the commit stored in the index is used instead. + +--files:: + This option is only valid for the summary command. This command + compares the commit in the index with that in the submodule HEAD + when this option is used. + +-n:: +--summary-limit:: + This option is only valid for the summary command. + Limit the summary size (number of commits shown in total). + Giving 0 will disable the summary; a negative number means unlimited + (the default). This limit only applies to modified submodules. The + size is always limited to 1 for added/deleted/typechanged submodules. + +-N:: +--no-fetch:: + This option is only valid for the update command. + Don't fetch new objects from the remote site. + +--merge:: + This option is only valid for the update command. + Merge the commit recorded in the superproject into the current branch + of the submodule. If this option is given, the submodule's HEAD will + not be detached. If a merge failure prevents this process, you will + have to resolve the resulting conflicts within the submodule with the + usual conflict resolution tools. + If the key `submodule.$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 a merge failure prevents this process, you will have + to resolve these failures with linkgit:git-rebase[1]. + If the key `submodule.$name.update` is set to `rebase`, this option is + implicit. + +--reference <repository>:: + This option is only valid for add and update commands. These + commands sometimes need to clone a remote repository. In this case, + this option will be passed to the linkgit:git-clone[1] command. ++ +*NOTE*: Do *not* use this option unless you have read the note +for linkgit:git-clone[1]'s --reference and --shared options carefully. + +--recursive:: + This option is only valid for foreach, update and status commands. + Traverse submodules recursively. The operation is performed not + only in the submodules of the current repo, but also + in any nested submodules inside those submodules (and so on). + +<path>...:: + Paths to submodule(s). When specified this will restrict the command + to only operate on the submodules found at the specified paths. + (This argument is required with add). + +FILES +----- +When initializing submodules, a .gitmodules file in the top-level directory +of the containing repository is used to find the url of each submodule. +This file should be formatted in the same way as `$GIT_DIR/config`. The key +to each submodule url is "submodule.$name.url". See linkgit:gitmodules[5] +for details. + + +AUTHOR +------ +Written by Lars Hjemli <hjemli@gmail.com> + +GIT +--- +Part of the linkgit:git[1] suite |