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# GitLab Shell
## GitLab Shell handles git SSH sessions for GitLab
GitLab Shell handles git SSH sessions for GitLab and modifies the list of authorized keys.
GitLab Shell is not a Unix shell nor a replacement for Bash or Zsh.
When you access the GitLab server over SSH then GitLab Shell will:
1. Limits you to predefined git commands (git push, git pull).
1. Call the GitLab Rails API to check if you are authorized, and what Gitaly server your repository is on
1. Copy data back and forth between the SSH client and the Gitaly server
If you access a GitLab server over HTTP(S) you end up in [gitlab-workhorse](https://gitlab.com/gitlab-org/gitlab-workhorse).
An overview of the four cases described above:
1. git pull over SSH -> gitlab-shell -> API call to gitlab-rails (Authorization) -> accept or decline -> establish Gitaly session
1. git push over SSH -> gitlab-shell (git command is not executed yet) -> establish Gitaly session -> (in Gitaly) gitlab-shell pre-receive hook -> API call to gitlab-rails (authorization) -> accept or decline push
## Code status
[](https://gitlab.com/gitlab-org/gitlab-shell/-/pipelines?ref=main)
[](https://gitlab.com/gitlab-org/gitlab-shell/-/pipelines?ref=main)
[](https://codeclimate.com/github/gitlabhq/gitlab-shell)
## Requirements
GitLab Shell is written in Go, and needs a Go compiler to build. It still requires
Ruby to build and test, but not to run.
Download and install the current version of Go from https://golang.org/dl/
## Setup
make setup
## Check
Checks if GitLab API access and redis via internal API can be reached:
make check
## Testing
Run tests:
bundle install
make test
Run gofmt:
make verify
Run both test and verify (the default Makefile target):
bundle install
make validate
## Git LFS remark
Starting with GitLab 8.12, GitLab supports Git LFS authentication through SSH.
## Releasing a new version
GitLab Shell is versioned by git tags, and the version used by the Rails
application is stored in
[`GITLAB_SHELL_VERSION`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/GITLAB_SHELL_VERSION).
For each version, there is a raw version and a tag version:
- The **raw version** is the version number. For instance, `15.2.8`.
- The **tag version** is the raw version prefixed with `v`. For instance, `v15.2.8`.
To release a new version of GitLab Shell and have that version available to the
Rails application:
1. Create a merge request to update the [`CHANGELOG`](CHANGELOG) with the
**tag version** and the [`VERSION`](VERSION) file with the **raw version**.
2. Ask a maintainer to review and merge the merge request. If you're already a
maintainer, second maintainer review is not required.
3. Add a new git tag with the **tag version**.
4. Update `GITLAB_SHELL_VERSION` in the Rails application to the **raw
version**. (Note: this can be done as a separate MR to that, or in and MR
that will make use of the latest GitLab Shell changes.)
## Contributing
See [CONTRIBUTING.md](./CONTRIBUTING.md).
## License
See [LICENSE](./LICENSE).
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