98 lines
5 KiB
Markdown
98 lines
5 KiB
Markdown
---
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type: reference, dev
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stage: Create
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group: Editor
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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description: "GitLab's development guidelines for Wikis"
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---
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# Wikis development guide **(FREE)**
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/227027) in GitLab 13.5.
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## Overview
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The wiki functionality in GitLab is based on [Gollum 4.x](https://github.com/gollum/gollum/).
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It's used in [Gitaly's](gitaly.md) Ruby service, and accessed from the Rails app through Gitaly RPC calls.
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Wikis use Git repositories as storage backend, and can be accessed through:
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- The [Web UI](../user/project/wiki/index.md)
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- The [REST API](../api/wikis.md)
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- [Git itself](../user/project/wiki/index.md#create-or-edit-wiki-pages-locally)
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[Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2214) in GitLab 13.5, wikis are also available
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for groups, in addition to projects.
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## Involved Gems
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Some notable gems that are used for wikis are:
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| Component | Description | Gem name | GitLab project | Upstream project |
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|:--------------|:-----------------------------------------------|:-------------------------------|:--------------------------------------------------------------------------------------------------------|:--------------------------------------------------------------------|
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| `gitlab` | Markup renderer, depends on various other gems | `gitlab-markup` | [`gitlab-org/gitlab-markup`](https://gitlab.com/gitlab-org/gitlab-markup) | [`github/markup`](https://github.com/github/markup) |
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| `gitaly-ruby` | Main Gollum library | `gitlab-gollum-lib` | [`gitlab-org/gollum-lib`](https://gitlab.com/gitlab-org/gollum-lib) | [`gollum/gollum-lib`](https://github.com/gollum/gollum-lib) |
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| | Gollum Git adapter for Rugged | `gitlab-gollum-rugged_adapter` | [`gitlab-org/gitlab-gollum-rugged_adapter`](https://gitlab.com/gitlab-org/gitlab-gollum-rugged_adapter) | [`gollum/rugged_adapter`](https://github.com/gollum/rugged_adapter) |
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| | Rugged (also used in Gitaly itself) | `rugged` | - | [`libgit2/rugged`](https://github.com/libgit2/rugged) |
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### Notes on Gollum
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We only use Gollum as a storage abstraction layer, to handle the mapping between wiki page slugs and files in the repository.
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When rendering wiki pages, we don't use Gollum at all and instead go through a
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[custom Banzai pipeline](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/banzai/pipeline/wiki_pipeline.rb).
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This adds some [wiki-specific markup](../user/markdown.md#wiki-specific-markdown), such as Gollum's `[[link]]` syntax.
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Because we do not make use of most of Gollum's features, we plan to move away from it entirely at some point.
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[See this epic](https://gitlab.com/groups/gitlab-org/-/epics/2381) for reference.
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## Model classes
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The `Wiki` class is the main abstraction around a wiki repository, it needs to be initialized
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with a container which can be either a `Project` or `Group`:
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```mermaid
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classDiagram
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Wiki --> ProjectWiki
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Wiki --> GroupWiki
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class Wiki {
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#container
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#repository
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}
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class ProjectWiki {
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#project → #container
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}
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class GroupWiki {
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#group → #container
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}
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```
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Some models wrap similar classes from Gitaly and Gollum:
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| Rails Model | Gitaly Class | Gollum |
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|:------------|:--------------------------------------------------------|:---------------|
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| `Wiki` | `Gitlab::Git::Wiki` | `Gollum::Wiki` |
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| `WikiPage` | `Gitlab::Git::WikiPage`, `Gitlab::Git::WikiPageVersion` | `Gollum::Page` |
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| | `Gitlab::Git::WikiFile` | `Gollum::File` |
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Only some data is persisted in the database:
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| Model | Description |
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|:----------------------|:-----------------------------------------|
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| `WikiPage::Meta` | Metadata for wiki pages |
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| `WikiPage::Slug` | Current and previous slugs of wiki pages |
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| `ProjectRepository` | Gitaly storage data for project wikis |
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| `GroupWikiRepository` | Gitaly storage data for group wikis |
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## Attachments
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The web UI uploads attachments through the REST API, which stores the files as commits in the wiki repository.
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Prior to GitLab 11.3 attachments were stored outside of the repository, [see this issue](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/33475).
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## Related topics
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- [Gollum installation instructions](https://github.com/gollum/gollum/wiki/Installation)
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