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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.
+---
+
+# Pull Mirroring Implementation
+
+For more details, refer to the official documentation: [GitLab Pull Mirroring Documentation](../../../user/project/repository/mirror/pull.md).
+
+## Stage 1: `UpdateAllMirrorsWorker` - Fetch Eligible Projects for Pull Mirroring
+
+### Eligibility Criteria for Projects
+
+A project must meet the following criteria to be eligible for pull mirroring:
+
+- The project has a pull mirroring configuration.
+- The project belongs to a premium or ultimate namespace.
+- The project is not archived.
+- The project is not deleted.
+- The project has an import status of `empty`, `finished`, or `failed`.
+- The `next_execution_timestamp` is not in the future.
+
+The [`UpdateAllMirrorsWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/update_all_mirrors_worker.rb) queries for all projects that meet the eligibility criteria and schedules them in batches.
+
+For each eligible project, it schedules a [`ProjectImportScheduleWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/project_import_schedule_worker.rb) with the project's ID.
+
+## Stage 2: `ProjectImportScheduleWorker` - Pre-verification
+
+The [`ProjectImportScheduleWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/project_import_schedule_worker.rb) performs several checks before scheduling the pull mirroring process:
+
+- Verifies if the project still exists.
+- Changes the project’s import status to `scheduled`.
+- Marks the project as `failed` if it is no longer eligible for pull mirroring.
+
+The `project.import_state.schedule` call triggers a series of actions, ultimately scheduling the [`RepositoryUpdateMirrorWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/repository_update_mirror_worker.rb):
+
+1. [`import_state.schedule`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/project_import_schedule_worker.rb#L29)
+1. [`ProjectImportState#after_transition`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/app/models/project_import_state.rb#L49-58)
+1. [`EE::Project#add_import_job`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/models/ee/project.rb#L778)
+1. [`RepositoryUpdateMirrorWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/repository_update_mirror_worker.rb#L3)
+
+## Stage 3: `RepositoryUpdateMirrorWorker` - Start Processing
+
+The [`RepositoryUpdateMirrorWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/repository_update_mirror_worker.rb) is responsible for starting the pull mirroring process:
+
+- It changes the project’s import status from `scheduled` to `started`.
+- It invokes the [`Projects::UpdateMirrorService`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/services/projects/update_mirror_service.rb) to perform the actual mirroring operations.
+
+## Stage 4: `Projects::UpdateMirrorService` - Processing
+
+The [`Projects::UpdateMirrorService`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/services/projects/update_mirror_service.rb) performs the core operations of pull mirroring:
+
+1. Verifies that the pull mirror configuration is correct and that the user has sufficient permissions.
+1. Requests Gitaly to execute a `git fetch` via the [`FetchRemoteRequest`](https://gitlab-org.gitlab.io/gitaly/#gitaly.FetchRemoteRequest).
+1. Creates any missing tags locally and removes tags that no longer exist remotely.
+1. Imports new LFS (Large File Storage) objects.
+1. Creates new branches that are missing locally.
+1. Performs housekeeping tasks (e.g., cleaning up stale data).
+
+## Stage 5: `RepositoryUpdateMirrorWorker` - Finalization
+
+After the mirroring process is completed, the [`RepositoryUpdateMirrorWorker`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/ee/app/workers/repository_update_mirror_worker.rb) finalizes the process:
+
+- It changes the project’s import status from `started` to `finished`.
+- If any errors occur during the process, it changes the import status from `started` to `failed` and attaches an error message to the [`ProjectImportState`](https://gitlab.com/gitlab-org/gitlab/-/blob/f77763345e35c7c4c6a4320f1bd1633a392e3e7c/app/models/project_import_state.rb).
+
+## Execution graph
+
+```mermaid
+flowchart TB
+
+DB[(Database)]
+
+DB -- 1.regularly fetch mirrors to update --> UpdateAllMirrorsWorker
+UpdateAllMirrorsWorker --> DB
+UpdateAllMirrorsWorker -- 2.schedule workers for each project --> import_worker("ProjectImportScheduleWorker: start one per project")
+import_worker -- 3.verify mirror state and change status to scheduled  --> import(" ProjectImportState#add_import_job")
+import -- 4.scheduled status triggers a new worker --> RepositoryUpdateMirrorWorker
+RepositoryUpdateMirrorWorker -- 5.set status to started and start processing --> Projects::UpdateMirrorService#execute
+Projects::UpdateMirrorService#execute --> final("6.set status to finished or failed")
+```