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gitlab-org--gitlab-foss/doc/ci/git_submodules.md

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Using Git submodules with GitLab CI/CD

Use Git submodules to keep a Git repository as a subdirectory of another Git repository. You can clone another repository into your project and keep your commits separate.

Configure the .gitmodules file

When you use Git submodules, your project should have a file named .gitmodules. You might need to modify it to work in a GitLab CI/CD job.

For example, your .gitmodules configuration might look like the following if:

  • Your project is located at https://gitlab.com/secret-group/my-project.
  • Your project depends on https://gitlab.com/group/project, which you want to include as a submodule.
  • You check out your sources with an SSH address like git@gitlab.com:secret-group/my-project.git.
[submodule "project"]
  path = project
  url = ../../group/project.git

When your submodule is on the same GitLab server, you should use relative URLs in your .gitmodules file. Then you can clone with HTTPS in all your CI/CD jobs. You can also use SSH for all your local checkouts.

The above configuration instructs Git to automatically deduce the URL to use when cloning sources. Git uses the same configuration for both HTTPS and SSH. GitLab CI/CD uses HTTPS for cloning your sources, and you can continue to use SSH to clone locally.

For submodules not located on the same GitLab server, use the full URL:

[submodule "project-x"]
  path = project-x
  url = https://gitserver.com/group/project-x.git

Use Git submodules in CI/CD jobs

To make submodules work correctly in CI/CD jobs:

  1. Make sure you use relative URLs for submodules located in the same GitLab server.

  2. You can set the GIT_SUBMODULE_STRATEGY variable to either normal or recursive to tell the runner to fetch your submodules before the job:

    variables:
  GIT_SUBMODULE_STRATEGY: recursive