6 git-submodule - Initialize, update or inspect submodules
12 'git submodule' [--quiet] add [-b branch] [--] <repository> <path>
13 'git submodule' [--quiet] status [--cached] [--] [<path>...]
14 'git submodule' [--quiet] init [--] [<path>...]
15 'git submodule' [--quiet] update [--init] [--] [<path>...]
16 'git submodule' [--quiet] summary [--summary-limit <n>] [commit] [--] [<path>...]
21 Submodules allow foreign repositories to be embedded within
22 a dedicated subdirectory of the source tree, always pointed
23 at a particular commit.
25 They are not to be confused with remotes, which are meant mainly
26 for branches of the same project; submodules are meant for
27 different projects you would like to make part of your source tree,
28 while the history of the two projects still stays completely
29 independent and you cannot modify the contents of the submodule
30 from within the main project.
31 If you want to merge the project histories and want to treat the
32 aggregated whole as a single project from then on, you may want to
33 add a remote for the other project and use the 'subtree' merge strategy,
34 instead of treating the other project as a submodule. Directories
35 that come from both projects can be cloned and checked out as a whole
36 if you choose to go that route.
38 Submodules are composed from a so-called `gitlink` tree entry
39 in the main repository that refers to a particular commit object
40 within the inner repository that is completely separate.
41 A record in the `.gitmodules` file at the root of the source
42 tree assigns a logical name to the submodule and describes
43 the default URL the submodule shall be cloned from.
44 The logical name can be used for overriding this URL within your
45 local repository configuration (see 'submodule init').
47 This command will manage the tree entries and contents of the
48 gitmodules file for you, as well as inspect the status of your
49 submodules and update them.
50 When adding a new submodule to the tree, the 'add' subcommand
51 is to be used. However, when pulling a tree containing submodules,
52 these will not be checked out by default;
53 the 'init' and 'update' subcommands will maintain submodules
54 checked out and at appropriate revision in your working tree.
55 You can briefly inspect the up-to-date status of your submodules
56 using the 'status' subcommand and get a detailed overview of the
57 difference between the index and checkouts using the 'summary'
64 Add the given repository as a submodule at the given path
65 to the changeset to be committed next to the current
66 project: the current project is termed termed the "superproject".
68 This requires two arguments: <repository> and <path>.
70 <repository> is the URL of the new submodule's origin repository.
71 This may be either an absolute URL, or (if it begins with ./
72 or ../), the location relative to the superproject's origin
75 <path> is the relative location for the cloned submodule to
76 exist in the superproject. If <path> does not exist, then the
77 submodule is created by cloning from the named URL. If <path> does
78 exist and is already a valid git repository, then this is added
79 to the changeset without cloning. This second form is provided
80 to ease creating a new submodule from scratch, and presumes
81 the user will later push the submodule to the given URL.
83 In either case, the given URL is recorded into .gitmodules for
84 use by subsequent users cloning the superproject. If the URL is
85 given relative to the superproject's repository, the presumption
86 is the superproject and submodule repositories will be kept
87 together in the same relative location, and only the
88 superproject's URL need be provided: git-submodule will correctly
89 locate the submodule using the relative URL in .gitmodules.
92 Show the status of the submodules. This will print the SHA-1 of the
93 currently checked out commit for each submodule, along with the
94 submodule path and the output of 'git-describe' for the
95 SHA-1. Each SHA-1 will be prefixed with `-` if the submodule is not
96 initialized and `+` if the currently checked out submodule commit
97 does not match the SHA-1 found in the index of the containing
98 repository. This command is the default command for 'git-submodule'.
101 Initialize the submodules, i.e. register each submodule name
102 and url found in .gitmodules into .git/config.
103 The key used in .git/config is `submodule.$name.url`.
104 This command does not alter existing information in .git/config.
105 You can then customize the submodule clone URLs in .git/config
106 for your local setup and proceed to 'git submodule update';
107 you can also just use 'git submodule update --init' without
108 the explicit 'init' step if you do not intend to customize
109 any submodule locations.
112 Update the registered submodules, i.e. clone missing submodules and
113 checkout the commit specified in the index of the containing repository.
114 This will make the submodules HEAD be detached.
116 If the submodule is not yet initialized, and you just want to use the
117 setting as stored in .gitmodules, you can automatically initialize the
118 submodule with the --init option.
121 Show commit summary between the given commit (defaults to HEAD) and
122 working tree/index. For a submodule in question, a series of commits
123 in the submodule between the given super project commit and the
124 index or working tree (switched by --cached) are shown.
130 Only print error messages.
134 Branch of repository to add as submodule.
137 This option is only valid for status and summary commands. These
138 commands typically use the commit found in the submodule HEAD, but
139 with this option, the commit stored in the index is used instead.
143 This option is only valid for the summary command.
144 Limit the summary size (number of commits shown in total).
145 Giving 0 will disable the summary; a negative number means unlimited
146 (the default). This limit only applies to modified submodules. The
147 size is always limited to 1 for added/deleted/typechanged submodules.
150 Path to submodule(s). When specified this will restrict the command
151 to only operate on the submodules found at the specified paths.
152 (This argument is required with add).
156 When initializing submodules, a .gitmodules file in the top-level directory
157 of the containing repository is used to find the url of each submodule.
158 This file should be formatted in the same way as `$GIT_DIR/config`. The key
159 to each submodule url is "submodule.$name.url". See linkgit:gitmodules[5]
165 Written by Lars Hjemli <hjemli@gmail.com>
169 Part of the linkgit:git[1] suite