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---
stage: Create
group: Source Code
info: Any user with at least the Maintainer role can merge updates to this content. For details, see https://docs.gitlab.com/ee/development/development_processes.html#development-guidelines-review.
---
# Source Code Management
The Source Code Management team is responsible for all backend aspects of the product categories
that fall under the [Source Code group](https://about.gitlab.com/handbook/product/categories/#source-code-group)
of the [Create stage](https://about.gitlab.com/handbook/product/categories/#create-stage)
of the [DevOps lifecycle](https://about.gitlab.com/handbook/product/categories/#devops-stages).
The Source Code Management team interfaces with the Gitaly and Code Review teams and works across three codebases: Workhorse, GitLab Shell and GitLab Rails.
## Source Code Features Reference
Features owned by the Source Code Management group are listed on the
[Features by Group Page](https://about.gitlab.com/handbook/product/categories/features/#createsource-code-group).
### Code Owners
Source Code Management shares ownership of Code Owners with the Code Review group.
- [Feature homepage](../../../user/project/codeowners/index.md)
- [Developer Reference](../../code_owners/index.md)
### Approval Rules
- [Approval Rules](../../merge_request_concepts/approval_rules.md)
### Protected Branches
Details about Protected Branches models can be found in the [Code Owners](../../code_owners/index.md#related-models) technical reference page.
### Repositories
- [Project Repository Storage Moves](../../repository_storage_moves/index.md)
### Project Templates
- [Custom group-level project templates development guidelines](../../project_templates/index.md)
### Git LFS
- [Git LFS Development guidelines](../../lfs.md)
## Technical Stack
## GitLab Rails
### Gitaly touch points
[Gitaly](../../../administration/gitaly/index.md) provides high-level RPC access to Git repositories.
It is present in every GitLab installation and coordinates Git repository storage and retrieval.
Gitaly implements a client-server architecture with Gitaly as the server and Gitaly clients, also
known as _Gitaly consumers_, including:
- GitLab Rails
- GitLab Shell
- GitLab Workhorse
Gitaly Rails provides API endpoints that are counterparts of Gitaly RPCs. For more information, read [Gitaly touch points](gitaly_touch_points.md).
### Annotated Rails Source Code
The `:source_code_management` annotation indicates which code belongs to the Source Code Management
group in the Rails codebase. The annotated objects are presented on
[this page](https://gitlab-com.gitlab.io/gl-infra/platform/stage-groups-index/source-code.html) along
with the [Error Budgets dashboards](https://dashboards.gitlab.net/d/stage-groups-source_code/stage-groups3a-source-code3a-group-dashboard?orgId=1).
## GitLab Workhorse
[GitLab Workhorse](../../workhorse/index.md) is a smart reverse proxy for GitLab. It handles "large" HTTP
requests such as file downloads, file uploads, `git push`, `git pull` and `git` archive downloads.
Workhorse itself is not a feature, but there are several features in GitLab
that would not work efficiently without Workhorse.
## GitLab Shell
GitLab Shell handles Git SSH sessions for GitLab and modifies the list of authorized keys.
For more information, refer to the [GitLab Shell documentation](../../gitlab_shell/index.md).
To learn about the reasoning behind our creation of `gitlab-sshd`, read the blog post
[Why we implemented our own SSHD solution](https://about.gitlab.com/blog/2022/08/17/why-we-have-implemented-our-own-sshd-solution-on-gitlab-sass/).
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