Add group wiki model

- Refactor existing `ProjectWiki` into `Wiki`, and add new child classes
  `ProjectWiki` and `GroupWiki`.
- Rename `project` to `container` in the wiki classes.
- Add `HasWiki` concern for use in `Project` and `Group`.
- Add `@groups` prefix in `Storage::Hashed`.
- Refactor existing specs into shared examples.

.rubocop_todo.yml

@@ -475,7 +475,6 @@ Style/MixinUsage:
 Style/MultilineIfModifier:
   Exclude:
     - 'app/helpers/snippets_helper.rb'
-    - 'app/models/project_wiki.rb'
     - 'app/services/ci/process_pipeline_service.rb'
     - 'lib/api/commit_statuses.rb'
 

app/models/concerns/has_repository.rb

@@ -9,7 +9,6 @@
 # needs any special behavior.
 module HasRepository
   extend ActiveSupport::Concern
-  include AfterCommitQueue
   include Referable
   include Gitlab::ShellAdapter
   include Gitlab::Utils::StrongMemoize

app/models/concerns/has_wiki.rb

+# frozen_string_literal: true
+
+module HasWiki
+  extend ActiveSupport::Concern
+
+  included do
+    validate :check_wiki_path_conflict
+  end
+
+  def create_wiki
+    wiki.wiki
+    true
+  rescue Wiki::CouldNotCreateWikiError
+    errors.add(:base, _('Failed to create wiki'))
+    false
+  end
+
+  def wiki
+    strong_memoize(:wiki) do
+      Wiki.for_container(self, self.owner)
+    end
+  end
+
+  def wiki_repository_exists?
+    wiki.repository_exists?
+  end
+
+  def after_wiki_activity
+    true
+  end
+
+  private
+
+  def check_wiki_path_conflict
+    return if path.blank?
+
+    path_to_check = path.ends_with?('.wiki') ? path.chomp('.wiki') : "#{path}.wiki"
+
+    if Project.in_namespace(parent_id).where(path: path_to_check).exists? ||
+        GroupsFinder.new(nil, parent: parent_id).execute.where(path: path_to_check).exists?
+      errors.add(:name, _('has already been taken'))
+    end
+  end
+end

app/models/concerns/storage/legacy_project_wiki.rb

-# frozen_string_literal: true
-
-module Storage
-  module LegacyProjectWiki
-    extend ActiveSupport::Concern
-
-    def disk_path
-      project.disk_path + '.wiki'
-    end
-  end
-end

app/models/group.rb

@@ -15,6 +15,7 @@ class Group < Namespace
   include WithUploads
   include Gitlab::Utils::StrongMemoize
   include GroupAPICompatibility
+  include HasWiki
 
   ACCESS_REQUEST_APPROVERS_TO_BE_NOTIFIED_LIMIT = 10
 

app/models/group_wiki.rb

+# frozen_string_literal: true
+
+class GroupWiki < Wiki
+  alias_method :group, :container
+
+  override :storage
+  def storage
+    @storage ||= Storage::Hashed.new(container, prefix: Storage::Hashed::GROUP_REPOSITORY_PATH_PREFIX)
+  end
+
+  override :repository_storage
+  def repository_storage
+    # TODO: Add table to track storage
+    # https://gitlab.com/gitlab-org/gitlab/-/issues/207865
+    'default'
+  end
+
+  override :hashed_storage?
+  def hashed_storage?
+    true
+  end
+
+  override :disk_path
+  def disk_path(*args, &block)
+    storage.disk_path + '.wiki'
+  end
+end

app/models/project.rb

@@ -3,6 +3,7 @@
 require 'carrierwave/orm/activerecord'
 
 class Project < ApplicationRecord
+  extend ::Gitlab::Utils::Override
   include Gitlab::ConfigHelper
   include Gitlab::VisibilityLevel
   include AccessRequestable
@@ -18,6 +19,7 @@ class Project < ApplicationRecord
   include SelectForProjectAuthorization
   include Presentable
   include HasRepository
+  include HasWiki
   include Routable
   include GroupDescendant
   include Gitlab::SQL::Pattern
@@ -386,7 +388,6 @@ class Project < ApplicationRecord
   validate :check_repository_path_availability, on: :update, if: ->(project) { project.renamed? }
   validate :visibility_level_allowed_by_group, if: :should_validate_visibility_level?
   validate :visibility_level_allowed_as_fork, if: :should_validate_visibility_level?
-  validate :check_wiki_path_conflict
   validate :validate_pages_https_only, if: -> { changes.has_key?(:pages_https_only) }
   validates :repository_storage,
     presence: true,
@@ -1051,16 +1052,6 @@ class Project < ApplicationRecord
     self.errors.add(:visibility_level, _("%{level_name} is not allowed since the fork source project has lower visibility.") % { level_name: level_name })
   end
 
-  def check_wiki_path_conflict
-    return if path.blank?
-
-    path_to_check = path.ends_with?('.wiki') ? path.chomp('.wiki') : "#{path}.wiki"
-
-    if Project.where(namespace_id: namespace_id, path: path_to_check).exists?
-      errors.add(:name, _('has already been taken'))
-    end
-  end
-
   def pages_https_only
     return false unless Gitlab.config.pages.external_https
 
@@ -1560,10 +1551,6 @@ class Project < ApplicationRecord
     create_repository(force: true) unless repository_exists?
   end
 
-  def wiki_repository_exists?
-    wiki.repository_exists?
-  end
-
   # update visibility_level of forks
   def update_forks_visibility_level
     return if unlink_forks_upon_visibility_decrease_enabled?
@@ -1577,20 +1564,6 @@ class Project < ApplicationRecord
     end
   end
 
-  def create_wiki
-    ProjectWiki.new(self, self.owner).wiki
-    true
-  rescue ProjectWiki::CouldNotCreateWikiError
-    errors.add(:base, _('Failed create wiki'))
-    false
-  end
-
-  def wiki
-    strong_memoize(:wiki) do
-      ProjectWiki.new(self, self.owner)
-    end
-  end
-
   def allowed_to_share_with_group?
     !namespace.share_with_group_lock
   end
@@ -2420,6 +2393,11 @@ class Project < ApplicationRecord
     jira_imports.last
   end
 
+  override :after_wiki_activity
+  def after_wiki_activity
+    touch(:last_activity_at, :last_repository_updated_at)
+  end
+
   private
 
   def find_service(services, name)

app/models/project_wiki.rb

 # frozen_string_literal: true
 
-class ProjectWiki
-  include Storage::LegacyProjectWiki
-  include Gitlab::Utils::StrongMemoize
+class ProjectWiki < Wiki
+  alias_method :project, :container
 
-  MARKUPS = {
-    'Markdown' => :markdown,
-    'RDoc'     => :rdoc,
-    'AsciiDoc' => :asciidoc,
-    'Org'      => :org
-  }.freeze unless defined?(MARKUPS)
+  # Project wikis are tied to the main project storage
+  delegate :storage, :repository_storage, :hashed_storage?, to: :container
 
-  CouldNotCreateWikiError = Class.new(StandardError)
-  SIDEBAR = '_sidebar'
-
-  TITLE_ORDER = 'title'
-  CREATED_AT_ORDER = 'created_at'
-  DIRECTION_DESC = 'desc'
-  DIRECTION_ASC = 'asc'
-
-  attr_reader :project, :user
-
-  # Returns a string describing what went wrong after
-  # an operation fails.
-  attr_reader :error_message
-
-  def initialize(project, user = nil)
-    @project = project
-    @user = user
-  end
-
-  delegate :repository_storage, :hashed_storage?, to: :project
-
-  def path
-    @project.path + '.wiki'
-  end
-
-  def full_path
-    @project.full_path + '.wiki'
-  end
-  alias_method :id, :full_path
-
-  # @deprecated use full_path when you need it for an URL route or disk_path when you want to point to the filesystem
-  alias_method :path_with_namespace, :full_path
-
-  def web_url(only_path: nil)
-    Gitlab::UrlBuilder.build(self, only_path: only_path)
-  end
-
-  def url_to_repo
-    ssh_url_to_repo
-  end
-
-  def ssh_url_to_repo
-    Gitlab::RepositoryUrlBuilder.build(repository.full_path, protocol: :ssh)
-  end
-
-  def http_url_to_repo
-    Gitlab::RepositoryUrlBuilder.build(repository.full_path, protocol: :http)
-  end
-
-  def wiki_base_path
-    [Gitlab.config.gitlab.relative_url_root, '/', @project.full_path, '/-', '/wikis'].join('')
-  end
-
-  # Returns the Gitlab::Git::Wiki object.
-  def wiki
-    strong_memoize(:wiki) do
-      repository.create_if_not_exists
-      raise CouldNotCreateWikiError unless repository_exists?
-
-      Gitlab::Git::Wiki.new(repository.raw)
-    end
-  rescue => err
-    Gitlab::ErrorTracking.track_exception(err, project_wiki: { project_id: project.id, full_path: full_path, disk_path: disk_path })
-    raise CouldNotCreateWikiError
-  end
-
-  def repository_exists?
-    !!repository.exists?
-  end
-
-  def has_home_page?
-    !!find_page('home')
-  end
-
-  def empty?
-    list_pages(limit: 1).empty?
-  end
-
-  def exists?
-    !empty?
-  end
-
-  # Lists wiki pages of the repository.
-  #
-  # limit - max number of pages returned by the method.
-  # sort - criterion by which the pages are sorted.
-  # direction - order of the sorted pages.
-  # load_content - option, which specifies whether the content inside the page
-  #                will be loaded.
-  #
-  # Returns an Array of GitLab WikiPage instances or an
-  # empty Array if this Wiki has no pages.
-  def list_pages(limit: 0, sort: nil, direction: DIRECTION_ASC, load_content: false)
-    wiki.list_pages(
-      limit: limit,
-      sort: sort,
-      direction_desc: direction == DIRECTION_DESC,
-      load_content: load_content
-    ).map do |page|
-      WikiPage.new(self, page)
-    end
-  end
-
-  # Finds a page within the repository based on a tile
-  # or slug.
-  #
-  # title - The human readable or parameterized title of
-  #         the page.
-  #
-  # Returns an initialized WikiPage instance or nil
-  def find_page(title, version = nil)
-    page_title, page_dir = page_title_and_dir(title)
-
-    if page = wiki.page(title: page_title, version: version, dir: page_dir)
-      WikiPage.new(self, page)
-    end
-  end
-
-  def find_sidebar(version = nil)
-    find_page(SIDEBAR, version)
-  end
-
-  def find_file(name, version = nil)
-    wiki.file(name, version)
-  end
-
-  def create_page(title, content, format = :markdown, message = nil)
-    commit = commit_details(:created, message, title)
-
-    wiki.write_page(title, format.to_sym, content, commit)
-
-    update_project_activity
-  rescue Gitlab::Git::Wiki::DuplicatePageError => e
-    @error_message = "Duplicate page: #{e.message}"
-    false
-  end
-
-  def update_page(page, content:, title: nil, format: :markdown, message: nil)
-    commit = commit_details(:updated, message, page.title)
-
-    wiki.update_page(page.path, title || page.name, format.to_sym, content, commit)
-
-    update_project_activity
-  end
-
-  def delete_page(page, message = nil)
-    return unless page
-
-    wiki.delete_page(page.path, commit_details(:deleted, message, page.title))
-
-    update_project_activity
-  end
-
-  def page_title_and_dir(title)
-    return unless title
-
-    title_array = title.split("/")
-    title = title_array.pop
-    [title, title_array.join("/")]
-  end
-
-  def repository
-    @repository ||= Repository.new(full_path, @project, shard: repository_storage, disk_path: disk_path, repo_type: Gitlab::GlRepository::WIKI)
-  end
-
-  def default_branch
-    wiki.class.default_ref
-  end
-
-  def ensure_repository
-    raise CouldNotCreateWikiError unless wiki.repository_exists?
-  end
-
-  def hook_attrs
-    {
-      web_url: web_url,
-      git_ssh_url: ssh_url_to_repo,
-      git_http_url: http_url_to_repo,
-      path_with_namespace: full_path,
-      default_branch: default_branch
-    }
-  end
-
-  private
-
-  def commit_details(action, message = nil, title = nil)
-    commit_message = message.presence || default_message(action, title)
-    git_user = Gitlab::Git::User.from_gitlab(user)
-
-    Gitlab::Git::Wiki::CommitDetails.new(user.id,
-                                         git_user.username,
-                                         git_user.name,
-                                         git_user.email,
-                                         commit_message)
-  end
-
-  def default_message(action, title)
-    "#{user.username} #{action} page: #{title}"
-  end
-
-  def update_project_activity
-    @project.touch(:last_activity_at, :last_repository_updated_at)
+  override :disk_path
+  def disk_path(*args, &block)
+    container.disk_path + '.wiki'
   end
 end
 
+# TODO: Remove this once we implement ES support for group wikis.
+# https://gitlab.com/gitlab-org/gitlab/-/issues/207889
 ProjectWiki.prepend_if_ee('EE::ProjectWiki')

app/models/snippet.rb

@@ -15,6 +15,7 @@ class Snippet < ApplicationRecord
   include FromUnion
   include IgnorableColumns
   include HasRepository
+  include AfterCommitQueue
   extend ::Gitlab::Utils::Override
 
   MAX_FILE_COUNT = 1

app/models/storage/hashed.rb

@@ -6,6 +6,7 @@ module Storage
     delegate :gitlab_shell, :repository_storage, to: :container
 
     REPOSITORY_PATH_PREFIX = '@hashed'
+    GROUP_REPOSITORY_PATH_PREFIX = '@groups'
     SNIPPET_REPOSITORY_PATH_PREFIX = '@snippets'
     POOL_PATH_PREFIX = '@pools'
 

app/models/wiki.rb

+# frozen_string_literal: true
+
+class Wiki
+  extend ::Gitlab::Utils::Override
+  include HasRepository
+  include Gitlab::Utils::StrongMemoize
+
+  MARKUPS = { # rubocop:disable Style/MultilineIfModifier
+    'Markdown' => :markdown,
+    'RDoc'     => :rdoc,
+    'AsciiDoc' => :asciidoc,
+    'Org'      => :org
+  }.freeze unless defined?(MARKUPS)
+
+  CouldNotCreateWikiError = Class.new(StandardError)
+
+  HOMEPAGE = 'home'
+  SIDEBAR = '_sidebar'
+
+  TITLE_ORDER = 'title'
+  CREATED_AT_ORDER = 'created_at'
+  DIRECTION_DESC = 'desc'
+  DIRECTION_ASC = 'asc'
+
+  attr_reader :container, :user
+
+  # Returns a string describing what went wrong after
+  # an operation fails.
+  attr_reader :error_message
+
+  def self.for_container(container, user = nil)
+    "#{container.class.name}Wiki".constantize.new(container, user)
+  end
+
+  def initialize(container, user = nil)
+    @container = container
+    @user = user
+  end
+
+  def path
+    container.path + '.wiki'
+  end
+
+  # Returns the Gitlab::Git::Wiki object.
+  def wiki
+    strong_memoize(:wiki) do
+      repository.create_if_not_exists
+      raise CouldNotCreateWikiError unless repository_exists?
+
+      Gitlab::Git::Wiki.new(repository.raw)
+    end
+  rescue => err
+    Gitlab::ErrorTracking.track_exception(err, wiki: {
+      container_type: container.class.name,
+      container_id: container.id,
+      full_path: full_path,
+      disk_path: disk_path
+    })
+
+    raise CouldNotCreateWikiError
+  end
+
+  def has_home_page?
+    !!find_page(HOMEPAGE)
+  end
+
+  def empty?
+    list_pages(limit: 1).empty?
+  end
+
+  def exists?
+    !empty?
+  end
+
+  # Lists wiki pages of the repository.
+  #
+  # limit - max number of pages returned by the method.
+  # sort - criterion by which the pages are sorted.
+  # direction - order of the sorted pages.
+  # load_content - option, which specifies whether the content inside the page
+  #                will be loaded.
+  #
+  # Returns an Array of GitLab WikiPage instances or an
+  # empty Array if this Wiki has no pages.
+  def list_pages(limit: 0, sort: nil, direction: DIRECTION_ASC, load_content: false)
+    wiki.list_pages(
+      limit: limit,
+      sort: sort,
+      direction_desc: direction == DIRECTION_DESC,
+      load_content: load_content
+    ).map do |page|
+      WikiPage.new(self, page)
+    end
+  end
+
+  # Finds a page within the repository based on a tile
+  # or slug.
+  #
+  # title - The human readable or parameterized title of
+  #         the page.
+  #
+  # Returns an initialized WikiPage instance or nil
+  def find_page(title, version = nil)
+    page_title, page_dir = page_title_and_dir(title)
+
+    if page = wiki.page(title: page_title, version: version, dir: page_dir)
+      WikiPage.new(self, page)
+    end
+  end
+
+  def find_sidebar(version = nil)
+    find_page(SIDEBAR, version)
+  end
+
+  def find_file(name, version = nil)
+    wiki.file(name, version)
+  end
+
+  def create_page(title, content, format = :markdown, message = nil)
+    commit = commit_details(:created, message, title)
+
+    wiki.write_page(title, format.to_sym, content, commit)
+
+    update_container_activity
+  rescue Gitlab::Git::Wiki::DuplicatePageError => e
+    @error_message = "Duplicate page: #{e.message}"
+    false
+  end
+
+  def update_page(page, content:, title: nil, format: :markdown, message: nil)
+    commit = commit_details(:updated, message, page.title)
+
+    wiki.update_page(page.path, title || page.name, format.to_sym, content, commit)
+
+    update_container_activity
+  end
+
+  def delete_page(page, message = nil)
+    return unless page
+
+    wiki.delete_page(page.path, commit_details(:deleted, message, page.title))
+
+    update_container_activity
+  end
+
+  def page_title_and_dir(title)
+    return unless title
+
+    title_array = title.split("/")
+    title = title_array.pop
+    [title, title_array.join("/")]
+  end
+
+  def ensure_repository
+    raise CouldNotCreateWikiError unless wiki.repository_exists?
+  end
+
+  def hook_attrs
+    {
+      web_url: web_url,
+      git_ssh_url: ssh_url_to_repo,
+      git_http_url: http_url_to_repo,
+      path_with_namespace: full_path,
+      default_branch: default_branch
+    }
+  end
+
+  override :repository
+  def repository
+    @repository ||= Repository.new(full_path, container, shard: repository_storage, disk_path: disk_path, repo_type: Gitlab::GlRepository::WIKI)
+  end
+
+  def repository_storage
+    raise NotImplementedError
+  end
+
+  def hashed_storage?
+    raise NotImplementedError
+  end
+
+  override :full_path
+  def full_path
+    container.full_path + '.wiki'
+  end
+  alias_method :id, :full_path
+
+  # @deprecated use full_path when you need it for an URL route or disk_path when you want to point to the filesystem
+  alias_method :path_with_namespace, :full_path
+
+  override :default_branch
+  def default_branch
+    wiki.class.default_ref
+  end
+
+  def wiki_base_path
+    Gitlab.config.gitlab.relative_url_root + web_url(only_path: true).sub(%r{/#{Wiki::HOMEPAGE}\z}, '')
+  end
+
+  private
+
+  def commit_details(action, message = nil, title = nil)
+    commit_message = message.presence || default_message(action, title)
+    git_user = Gitlab::Git::User.from_gitlab(user)
+
+    Gitlab::Git::Wiki::CommitDetails.new(user.id,
+                                         git_user.username,
+                                         git_user.name,
+                                         git_user.email,
+                                         commit_message)
+  end
+
+  def default_message(action, title)
+    "#{user.username} #{action} page: #{title}"
+  end
+
+  def update_container_activity
+    container.after_wiki_activity
+  end
+end
+
+Wiki.prepend_if_ee('EE::Wiki')

app/models/wiki_page.rb

@@ -26,7 +26,7 @@ class WikiPage
   def eql?(other)
     return false unless other.present? && other.is_a?(self.class)
 
-    slug == other.slug && wiki.project == other.wiki.project
+    slug == other.slug && wiki.container == other.wiki.container
   end
 
   alias_method :==, :eql?
@@ -66,9 +66,9 @@ class WikiPage
   validates :content, presence: true
   validate :validate_path_limits, if: :title_changed?
 
-  # The GitLab ProjectWiki instance.
+  # The GitLab Wiki instance.
   attr_reader :wiki
-  delegate :project, to: :wiki
+  delegate :container, to: :wiki
 
   # The raw Gitlab::Git::WikiPage instance.
   attr_reader :page
@@ -83,7 +83,7 @@ class WikiPage
 
   # Construct a new WikiPage
   #
-  # @param [ProjectWiki] wiki
+  # @param [Wiki] wiki
   # @param [Gitlab::Git::WikiPage] page
   def initialize(wiki, page = nil)
     @wiki       = wiki
@@ -195,7 +195,7 @@ class WikiPage
   #       :content - The raw markup content.
   #       :format  - Optional symbol representing the
   #                  content format. Can be any type
-  #                  listed in the ProjectWiki::MARKUPS
+  #                  listed in the Wiki::MARKUPS
   #                  Hash.
   #       :message - Optional commit message to set on
   #                  the new page.
@@ -215,7 +215,7 @@ class WikiPage
   # attrs - Hash of attributes to be updated on the page.
   #        :content         - The raw markup content to replace the existing.
   #        :format          - Optional symbol representing the content format.
-  #                           See ProjectWiki::MARKUPS Hash for available formats.
+  #                           See Wiki::MARKUPS Hash for available formats.
   #        :message         - Optional commit message to set on the new version.
   #        :last_commit_sha - Optional last commit sha to validate the page unchanged.
   #        :title           - The Title (optionally including dir) to replace existing title
@@ -261,6 +261,7 @@ class WikiPage
   # Relative path to the partial to be used when rendering collections
   # of this object.
   def to_partial_path
+    # TODO: Move into shared/ with https://gitlab.com/gitlab-org/gitlab/-/issues/196054
     'projects/wikis/wiki_page'
   end
 
@@ -303,7 +304,7 @@ class WikiPage
   end
 
   def update_front_matter(attrs)
-    return unless Gitlab::WikiPages::FrontMatterParser.enabled?(project)
+    return unless Gitlab::WikiPages::FrontMatterParser.enabled?(container)
     return unless attrs.has_key?(:front_matter)
 
     fm_yaml = serialize_front_matter(attrs[:front_matter])
@@ -314,7 +315,7 @@ class WikiPage
 
   def parsed_content
     strong_memoize(:parsed_content) do
-      Gitlab::WikiPages::FrontMatterParser.new(raw_content, project).parse
+      Gitlab::WikiPages::FrontMatterParser.new(raw_content, container).parse
     end
   end
 

app/policies/wiki_page_policy.rb

 # frozen_string_literal: true
 
 class WikiPagePolicy < BasePolicy
-  delegate { @subject.wiki.project }
+  delegate { @subject.wiki.container }
 
   rule { can?(:read_wiki) }.enable :read_wiki_page
 end

ee/app/models/ee/project_wiki.rb

@@ -3,22 +3,11 @@
 module EE
   module ProjectWiki
     extend ActiveSupport::Concern
-    extend ::Gitlab::Utils::Override
 
     prepended do
+      # TODO: Move this into EE::Wiki once we implement ES support for group wikis.
+      # https://gitlab.com/gitlab-org/gitlab/-/issues/207889
       include Elastic::WikiRepositoriesSearch
     end
-
-    # No need to have a Kerberos Web url. Kerberos URL will be used only to
-    # clone
-    def kerberos_url_to_repo
-      [::Gitlab.config.build_gitlab_kerberos_url, '/', full_path, '.git'].join('')
-    end
-
-    def path_to_repo
-      @path_to_repo ||=
-        File.join(::Gitlab.config.repositories.storages[project.repository_storage].legacy_disk_path,
-                  "#{disk_path}.git")
-    end
   end
 end

ee/app/models/ee/wiki.rb

+# frozen_string_literal: true
+
+module EE
+  module Wiki
+    extend ActiveSupport::Concern
+
+    # No need to have a Kerberos Web url. Kerberos URL will be used only to
+    # clone
+    def kerberos_url_to_repo
+      [::Gitlab.config.build_gitlab_kerberos_url, '/', full_path, '.git'].join('')
+    end
+  end
+end

ee/spec/models/ee/group_wiki_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GroupWiki do
+  it_behaves_like 'EE wiki model' do
+    let(:wiki_container) { create(:group, :wiki_repo) }
+
+    before do
+      wiki_container.add_owner(user)
+    end
+
+    it 'does not use Elasticsearch' do
+      expect(subject).not_to be_a(Elastic::WikiRepositoriesSearch)
+    end
+  end
+end

ee/spec/models/ee/project_wiki_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ProjectWiki do
+  it_behaves_like 'EE wiki model' do
+    let(:wiki_container) { create(:project, :wiki_repo, namespace: user.namespace) }
+
+    it 'uses Elasticsearch' do
+      expect(subject).to be_a(Elastic::WikiRepositoriesSearch)
+    end
+  end
+end

ee/spec/models/project_wiki_spec.rb → ee/spec/support/shared_examples/models/wiki_shared_examples.rb

 # frozen_string_literal: true
 
-require "spec_helper"
+RSpec.shared_examples_for 'EE wiki model' do
+  let_it_be(:user) { create(:user) }
+  let(:wiki) { described_class.for_container(wiki_container, user) }
 
-describe ProjectWiki do
-  let(:user) { create(:user, :commit_email) }
-  let(:project) { create(:project, :wiki_repo, namespace: user.namespace) }
-  let(:project_wiki) { described_class.new(project, user) }
+  subject { wiki }
 
-  subject { project_wiki }
-
-  describe "#kerberos_url_to_repo" do
+  describe '#kerberos_url_to_repo' do
     it 'returns valid kerberos url for this repo' do
       gitlab_kerberos_url = Gitlab.config.build_gitlab_kerberos_url
       repo_kerberos_url = "#{gitlab_kerberos_url}/#{subject.full_path}.git"

lib/gitlab/url_builder.rb

@@ -34,8 +34,8 @@ module Gitlab
           snippet_url(object, **options)
         when User
           instance.user_url(object, **options)
-        when ProjectWiki
-          instance.project_wiki_url(object.project, :home, **options)
+        when Wiki
+          wiki_url(object, **options)
         when WikiPage
           instance.project_wiki_url(object.wiki.project, object.slug, **options)
         else
@@ -70,6 +70,19 @@ module Gitlab
           instance.gitlab_snippet_url(snippet, **options)
         end
       end
+
+      def wiki_url(object, **options)
+        case object.container
+        when Project
+          instance.project_wiki_url(object.container, Wiki::HOMEPAGE, **options)
+        when Group
+          # TODO: Use the new route for group wikis once we add it.
+          # https://gitlab.com/gitlab-org/gitlab/-/issues/211360
+          instance.group_canonical_url(object.container, **options) + "/-/wikis/#{Wiki::HOMEPAGE}"
+        else
+          raise NotImplementedError.new("No URL builder defined for #{object.inspect}")
+        end
+      end
     end
   end
 end

locale/gitlab.pot

@@ -8663,9 +8663,6 @@ msgstr ""
 msgid "Failed Jobs"
 msgstr ""
 
-msgid "Failed create wiki"
-msgstr ""
-
 msgid "Failed to add a Zoom meeting"
 msgstr ""
 
@@ -8705,6 +8702,9 @@ msgstr ""
 msgid "Failed to create resources"
 msgstr ""
 
+msgid "Failed to create wiki"
+msgstr ""
+
 msgid "Failed to delete board. Please try again."
 msgstr ""
 

spec/factories/events.rb

@@ -25,11 +25,11 @@ FactoryBot.define do
 
     factory :wiki_page_event do
       action { Event::CREATED }
-      project { @overrides[:wiki_page]&.project || create(:project, :wiki_repo) }
+      project { @overrides[:wiki_page]&.container || create(:project, :wiki_repo) }
       target { create(:wiki_page_meta, :for_wiki_page, wiki_page: wiki_page) }
 
       transient do
-        wiki_page { create(:wiki_page, project: project) }
+        wiki_page { create(:wiki_page, container: project) }
       end
     end
   end

spec/factories/groups.rb

@@ -51,5 +51,11 @@ FactoryBot.define do
     trait :owner_subgroup_creation_only do
       subgroup_creation_level { ::Gitlab::Access::OWNER_SUBGROUP_ACCESS}
     end
+
+    trait :wiki_repo do
+      after(:create) do |group|
+        raise 'Failed to create wiki repository!' unless group.create_wiki
+      end
+    end
   end
 end

spec/factories/project_wikis.rb

-# frozen_string_literal: true
-
-FactoryBot.define do
-  factory :project_wiki do
-    skip_create
-
-    association :project, :wiki_repo
-    user { project.creator }
-    initialize_with { new(project, user) }
-  end
-end

spec/factories/wiki_pages.rb

@@ -8,7 +8,8 @@ FactoryBot.define do
       title { generate(:wiki_page_title) }
       content { 'Content for wiki page' }
       format { 'markdown' }
-      project { create(:project) }
+      project { association(:project, :wiki_repo) }
+      container { project }
       attrs do
         {
           title: title,
@@ -19,7 +20,7 @@ FactoryBot.define do
     end
 
     page { OpenStruct.new(url_path: 'some-name') }
-    wiki { build(:project_wiki, project: project) }
+    wiki { association(:wiki, container: container) }
 
     initialize_with { new(wiki, page) }
 
@@ -32,8 +33,6 @@ FactoryBot.define do
     end
 
     trait :with_real_page do
-      project { create(:project, :repository) }
-
       page do
         wiki.create_page(title, content)
         page_title, page_dir = wiki.page_title_and_dir(title)
@@ -48,10 +47,10 @@ FactoryBot.define do
 
     trait :for_wiki_page do
       transient do
-        wiki_page { create(:wiki_page, project: project) }
+        wiki_page { create(:wiki_page, container: project) }
       end
 
-      project { @overrides[:wiki_page]&.project || create(:project) }
+      project { @overrides[:wiki_page]&.container || create(:project) }
       title { wiki_page.title }
 
       initialize_with do

spec/factories/wikis.rb

+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :wiki do
+    transient do
+      container { association(:project, :wiki_repo) }
+      user { association(:user) }
+    end
+
+    initialize_with { Wiki.for_container(container, user) }
+    skip_create
+
+    factory :project_wiki do
+      transient do
+        project { association(:project, :wiki_repo) }
+      end
+
+      container { project }
+    end
+
+    factory :group_wiki do
+      container { association(:group, :wiki_repo) }
+    end
+  end
+end

spec/helpers/events_helper_spec.rb

@@ -3,6 +3,8 @@
 require 'spec_helper'
 
 describe EventsHelper do
+  include Gitlab::Routing
+
   describe '#event_commit_title' do
     let(:message) { 'foo & bar ' + 'A' * 70 + '\n' + 'B' * 80 }
 

spec/lib/banzai/pipeline/wiki_pipeline_spec.rb

@@ -59,8 +59,8 @@ describe Banzai::Pipeline::WikiPipeline do
     let(:project_wiki) { ProjectWiki.new(project, double(:user)) }
     let(:page) { build(:wiki_page, wiki: project_wiki, page: OpenStruct.new(url_path: 'nested/twice/start-page')) }
 
-    { "when GitLab is hosted at a root URL" => '/',
-      "when GitLab is hosted at a relative URL" => '/nested/relative/gitlab' }.each do |test_name, relative_url_root|
+    { 'when GitLab is hosted at a root URL' => '',
+      'when GitLab is hosted at a relative URL' => '/nested/relative/gitlab' }.each do |test_name, relative_url_root|
       context test_name do
         before do
           allow(Gitlab.config.gitlab).to receive(:relative_url_root).and_return(relative_url_root)

spec/lib/gitlab/git_access_wiki_spec.rb

@@ -52,14 +52,10 @@ describe Gitlab::GitAccessWiki do
       end
 
       context 'when the wiki repository does not exist' do
-        it 'returns not found' do
-          wiki_repo = project.wiki.repository
-          Gitlab::GitalyClient::StorageSettings.allow_disk_access do
-            FileUtils.rm_rf(wiki_repo.path)
-          end
+        let(:project) { create(:project) }
 
-          # Sanity check for rm_rf
-          expect(wiki_repo.exists?).to eq(false)
+        it 'returns not found' do
+          expect(project.wiki_repository_exists?).to eq(false)
 
           expect { subject }.to raise_error(Gitlab::GitAccess::NotFoundError, 'A repository for this project does not exist yet.')
         end

spec/lib/gitlab/repository_url_builder_spec.rb

@@ -9,7 +9,8 @@ describe Gitlab::RepositoryUrlBuilder do
     where(:factory, :path_generator) do
       :project          | ->(project) { project.full_path }
       :project_snippet  | ->(snippet) { "#{snippet.project.full_path}/snippets/#{snippet.id}" }
-      :project_wiki     | ->(wiki)    { "#{wiki.project.full_path}.wiki" }
+      :project_wiki     | ->(wiki)    { "#{wiki.container.full_path}.wiki" }
+      :group_wiki       | ->(wiki)    { "#{wiki.container.full_path}.wiki" }
 
       :personal_snippet | ->(snippet) { "snippets/#{snippet.id}" }
     end

spec/lib/gitlab/url_builder_spec.rb

@@ -23,11 +23,12 @@ describe Gitlab::UrlBuilder do
       :merge_request     | ->(merge_request) { "/#{merge_request.project.full_path}/-/merge_requests/#{merge_request.iid}" }
       :project_milestone | ->(milestone)     { "/#{milestone.project.full_path}/-/milestones/#{milestone.iid}" }
       :project_snippet   | ->(snippet)       { "/#{snippet.project.full_path}/snippets/#{snippet.id}" }
-      :project_wiki      | ->(wiki)          { "/#{wiki.project.full_path}/-/wikis/home" }
+      :project_wiki      | ->(wiki)          { "/#{wiki.container.full_path}/-/wikis/home" }
       :ci_build          | ->(build)         { "/#{build.project.full_path}/-/jobs/#{build.id}" }
 
       :group             | ->(group)         { "/groups/#{group.full_path}" }
       :group_milestone   | ->(milestone)     { "/groups/#{milestone.group.full_path}/-/milestones/#{milestone.iid}" }
+      :group_wiki        | ->(wiki)          { "/groups/#{wiki.container.full_path}/-/wikis/home" }
 
       :user              | ->(user)          { "/#{user.full_path}" }
       :personal_snippet  | ->(snippet)       { "/snippets/#{snippet.id}" }

spec/models/group_spec.rb

@@ -25,6 +25,11 @@ describe Group do
     it { is_expected.to have_many(:clusters).class_name('Clusters::Cluster') }
     it { is_expected.to have_many(:container_repositories) }
 
+    it_behaves_like 'model with wiki' do
+      let(:container) { create(:group, :nested, :wiki_repo) }
+      let(:container_without_wiki) { create(:group, :nested) }
+    end
+
     describe '#members & #requesters' do
       let(:requester) { create(:user) }
       let(:developer) { create(:user) }

spec/models/group_wiki_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GroupWiki do
+  it_behaves_like 'wiki model' do
+    let(:wiki_container) { create(:group, :wiki_repo) }
+    let(:wiki_container_without_repo) { create(:group) }
+
+    before do
+      wiki_container.add_owner(user)
+    end
+
+    describe '#storage' do
+      it 'uses the group repository prefix' do
+        expect(subject.storage.base_dir).to start_with('@groups/')
+      end
+    end
+
+    describe '#repository_storage' do
+      it 'returns the default storage' do
+        expect(subject.repository_storage).to eq('default')
+      end
+    end
+
+    describe '#hashed_storage?' do
+      it 'returns true' do
+        expect(subject.hashed_storage?).to be(true)
+      end
+    end
+
+    describe '#disk_path' do
+      it 'returns the repository storage path' do
+        expect(subject.disk_path).to eq("#{subject.storage.disk_path}.wiki")
+      end
+    end
+  end
+end

spec/models/personal_snippet_spec.rb

@@ -22,5 +22,6 @@ describe PersonalSnippet do
     let(:stubbed_container) { build_stubbed(:personal_snippet) }
     let(:expected_full_path) { "@snippets/#{container.id}" }
     let(:expected_web_url_path) { "snippets/#{container.id}" }
+    let(:expected_repo_url_path) { expected_web_url_path }
   end
 end

spec/models/project_snippet_spec.rb

@@ -38,5 +38,6 @@ describe ProjectSnippet do
     let(:stubbed_container) { build_stubbed(:project_snippet) }
     let(:expected_full_path) { "#{container.project.full_path}/@snippets/#{container.id}" }
     let(:expected_web_url_path) { "#{container.project.full_path}/snippets/#{container.id}" }
+    let(:expected_repo_url_path) { expected_web_url_path }
   end
 end

spec/models/project_spec.rb

@@ -118,6 +118,11 @@ describe Project do
       let(:expected_full_path) { "#{container.namespace.full_path}/somewhere" }
     end
 
+    it_behaves_like 'model with wiki' do
+      let(:container) { create(:project, :wiki_repo) }
+      let(:container_without_wiki) { create(:project) }
+    end
+
     it 'has an inverse relationship with merge requests' do
       expect(described_class.reflect_on_association(:merge_requests).has_inverse?).to eq(:target_project)
     end
@@ -263,27 +268,6 @@ describe Project do
       create(:project)
     end
 
-    describe 'wiki path conflict' do
-      context "when the new path has been used by the wiki of other Project" do
-        it 'has an error on the name attribute' do
-          new_project = build_stubbed(:project, namespace_id: project.namespace_id, path: "#{project.path}.wiki")
-
-          expect(new_project).not_to be_valid
-          expect(new_project.errors[:name].first).to eq(_('has already been taken'))
-        end
-      end
-
-      context "when the new wiki path has been used by the path of other Project" do
-        it 'has an error on the name attribute' do
-          project_with_wiki_suffix = create(:project, path: 'foo.wiki')
-          new_project = build_stubbed(:project, namespace_id: project_with_wiki_suffix.namespace_id, path: 'foo')
-
-          expect(new_project).not_to be_valid
-          expect(new_project.errors[:name].first).to eq(_('has already been taken'))
-        end
-      end
-    end
-
     context 'repository storages inclusion' do
       let(:project2) { build(:project, repository_storage: 'missing') }
 
@@ -4728,20 +4712,6 @@ describe Project do
     end
   end
 
-  describe '#wiki_repository_exists?' do
-    it 'returns true when the wiki repository exists' do
-      project = create(:project, :wiki_repo)
-
-      expect(project.wiki_repository_exists?).to eq(true)
-    end
-
-    it 'returns false when the wiki repository does not exist' do
-      project = create(:project)
-
-      expect(project.wiki_repository_exists?).to eq(false)
-    end
-  end
-
   describe '#write_repository_config' do
     let_it_be(:project) { create(:project, :repository) }
 

spec/models/wiki_page_spec.rb

@@ -3,9 +3,9 @@
 require "spec_helper"
 
 describe WikiPage do
-  let(:project) { create(:project, :wiki_repo) }
-  let(:user) { project.owner }
-  let(:wiki) { ProjectWiki.new(project, user) }
+  let_it_be(:user) { create(:user) }
+  let(:container) { create(:project, :wiki_repo) }
+  let(:wiki) { Wiki.for_container(container, user) }
 
   let(:new_page) do
     described_class.new(wiki).tap do |page|
@@ -24,9 +24,9 @@ describe WikiPage do
     stub_feature_flags(Gitlab::WikiPages::FrontMatterParser::FEATURE_FLAG => false)
   end
 
-  def enable_front_matter_for_project
+  def enable_front_matter_for(thing)
     stub_feature_flags(Gitlab::WikiPages::FrontMatterParser::FEATURE_FLAG => {
-      thing: project,
+      thing: thing,
       enabled: true
     })
   end
@@ -114,7 +114,8 @@ describe WikiPage do
 
   describe '#front_matter' do
     let_it_be(:project) { create(:project) }
-    let(:wiki_page) { create(:wiki_page, project: project, content: content) }
+    let(:container) { project }
+    let(:wiki_page) { create(:wiki_page, container: container, content: content) }
 
     shared_examples 'a page without front-matter' do
       it { expect(wiki_page).to have_attributes(front_matter: {}, content: content) }
@@ -153,12 +154,20 @@ describe WikiPage do
 
         it_behaves_like 'a page without front-matter'
 
-        context 'but enabled for the project' do
+        context 'but enabled for the container' do
           before do
-            enable_front_matter_for_project
+            enable_front_matter_for(container)
           end
 
-          it_behaves_like 'a page with front-matter'
+          context 'with a project container' do
+            it_behaves_like 'a page with front-matter'
+          end
+
+          context 'with a group container' do
+            let(:container) { create(:group) }
+
+            it_behaves_like 'a page with front-matter'
+          end
         end
       end
     end
@@ -514,12 +523,20 @@ describe WikiPage do
             expect([subject, page]).to all(have_attributes(front_matter: be_empty, content: content))
           end
 
-          context 'but it is enabled for the project' do
+          context 'but it is enabled for the container' do
             before do
-              enable_front_matter_for_project
+              enable_front_matter_for(container)
             end
 
-            it_behaves_like 'able to update front-matter'
+            context 'with a project container' do
+              it_behaves_like 'able to update front-matter'
+            end
+
+            context 'with a group container' do
+              let(:container) { create(:group) }
+
+              it_behaves_like 'able to update front-matter'
+            end
           end
         end
 
@@ -812,23 +829,32 @@ describe WikiPage do
       other_page = create(:wiki_page)
 
       expect(subject.slug).not_to eq(other_page.slug)
-      expect(subject.project).not_to eq(other_page.project)
+      expect(subject.container).not_to eq(other_page.container)
       expect(subject).not_to eq(other_page)
     end
 
-    it 'returns false for page with different slug on same project' do
-      other_page = create(:wiki_page, project: subject.project)
+    it 'returns false for page with different slug on same container' do
+      other_page = create(:wiki_page, container: subject.container)
 
       expect(subject.slug).not_to eq(other_page.slug)
-      expect(subject.project).to eq(other_page.project)
+      expect(subject.container).to eq(other_page.container)
       expect(subject).not_to eq(other_page)
     end
 
-    it 'returns false for page with the same slug on a different project' do
+    it 'returns false for page with the same slug on a different container of the same type' do
       other_page = create(:wiki_page, title: existing_page.slug)
 
       expect(subject.slug).to eq(other_page.slug)
-      expect(subject.project).not_to eq(other_page.project)
+      expect(subject.container).not_to eq(other_page.container)
+      expect(subject).not_to eq(other_page)
+    end
+
+    it 'returns false for page with the same slug on a different container type' do
+      group = create(:group, name: container.name)
+      other_page = create(:wiki_page, title: existing_page.slug, container: group)
+
+      expect(subject.slug).to eq(other_page.slug)
+      expect(subject.container).not_to eq(other_page.container)
       expect(subject).not_to eq(other_page)
     end
   end

spec/support/shared_examples/models/concerns/has_repository_shared_examples.rb

@@ -5,6 +5,7 @@ RSpec.shared_examples 'model with repository' do
   let(:stubbed_container) { raise NotImplementedError }
   let(:expected_full_path) { raise NotImplementedError }
   let(:expected_web_url_path) { expected_full_path }
+  let(:expected_repo_url_path) { expected_full_path }
 
   describe '#commits_by' do
     let(:commits) { container.repository.commits('HEAD', limit: 3).commits }
@@ -53,19 +54,19 @@ RSpec.shared_examples 'model with repository' do
 
   describe '#url_to_repo' do
     it 'returns the SSH URL to the repository' do
-      expect(container.url_to_repo).to eq("#{Gitlab.config.gitlab_shell.ssh_path_prefix}#{expected_web_url_path}.git")
+      expect(container.url_to_repo).to eq(container.ssh_url_to_repo)
     end
   end
 
   describe '#ssh_url_to_repo' do
     it 'returns the SSH URL to the repository' do
-      expect(container.ssh_url_to_repo).to eq(container.url_to_repo)
+      expect(container.ssh_url_to_repo).to eq("#{Gitlab.config.gitlab_shell.ssh_path_prefix}#{expected_repo_url_path}.git")
     end
   end
 
   describe '#http_url_to_repo' do
     it 'returns the HTTP URL to the repository' do
-      expect(container.http_url_to_repo).to eq("#{Gitlab.config.gitlab.url}/#{expected_web_url_path}.git")
+      expect(container.http_url_to_repo).to eq("#{Gitlab.config.gitlab.url}/#{expected_repo_url_path}.git")
     end
   end
 
@@ -95,12 +96,8 @@ RSpec.shared_examples 'model with repository' do
     end
 
     context 'when the repo exists' do
-      it { expect(container.empty_repo?).to be(false) }
-
-      it 'returns true when repository is empty' do
-        allow(container.repository).to receive(:empty?).and_return(true)
-
-        expect(container.empty_repo?).to be(true)
+      it 'returns the empty state of the repository' do
+        expect(container.empty_repo?).to be(container.repository.empty?)
       end
     end
   end
@@ -146,15 +143,14 @@ RSpec.shared_examples 'model with repository' do
     end
 
     it 'picks storage from ApplicationSetting' do
-      expect_next_instance_of(ApplicationSetting) do |instance|
-        expect(instance).to receive(:pick_repository_storage).and_return('picked')
-      end
+      expect(Gitlab::CurrentSettings).to receive(:pick_repository_storage).and_return('picked')
 
       expect(subject).to eq('picked')
     end
 
     it 'picks from the latest available storage', :request_store do
       stub_env('IN_MEMORY_APPLICATION_SETTINGS', 'false')
+      Gitlab::CurrentSettings.expire_current_application_settings
       Gitlab::CurrentSettings.current_application_settings
 
       settings = ApplicationSetting.last

spec/support/shared_examples/models/concerns/has_wiki_shared_examples.rb

+# frozen_string_literal: true
+
+RSpec.shared_examples 'model with wiki' do
+  describe '#create_wiki' do
+    it 'returns true if the wiki repository already exists' do
+      expect(container.wiki_repository_exists?).to be(true)
+      expect(container.create_wiki).to be(true)
+    end
+
+    it 'returns true if the wiki repository was created' do
+      expect(container_without_wiki.wiki_repository_exists?).to be(false)
+      expect(container_without_wiki.create_wiki).to be(true)
+      expect(container_without_wiki.wiki_repository_exists?).to be(true)
+    end
+
+    context 'when the repository cannot be created' do
+      before do
+        expect(container.wiki).to receive(:wiki) { raise Wiki::CouldNotCreateWikiError }
+      end
+
+      it 'returns false and adds a validation error' do
+        expect(container.create_wiki).to be(false)
+        expect(container.errors[:base]).to contain_exactly('Failed to create wiki')
+      end
+    end
+  end
+
+  describe '#wiki_repository_exists?' do
+    it 'returns true when the wiki repository exists' do
+      expect(container.wiki_repository_exists?).to eq(true)
+    end
+
+    it 'returns false when the wiki repository does not exist' do
+      expect(container_without_wiki.wiki_repository_exists?).to eq(false)
+    end
+  end
+
+  describe 'wiki path conflict' do
+    context 'when the new path has been used by the wiki of other Project' do
+      it 'has an error on the name attribute' do
+        create(:project, namespace: container.parent, path: 'existing')
+        container.path = 'existing.wiki'
+
+        expect(container).not_to be_valid
+        expect(container.errors[:name].first).to eq(_('has already been taken'))
+      end
+    end
+
+    context 'when the new wiki path has been used by the path of other Project' do
+      it 'has an error on the name attribute' do
+        create(:project, namespace: container.parent, path: 'existing.wiki')
+        container.path = 'existing'
+
+        expect(container).not_to be_valid
+        expect(container.errors[:name].first).to eq(_('has already been taken'))
+      end
+    end
+
+    context 'when the new path has been used by the wiki of other Group' do
+      it 'has an error on the name attribute' do
+        create(:group, parent: container.parent, path: 'existing')
+        container.path = 'existing.wiki'
+
+        expect(container).not_to be_valid
+        expect(container.errors[:name].first).to eq(_('has already been taken'))
+      end
+    end
+
+    context 'when the new wiki path has been used by the path of other Group' do
+      it 'has an error on the name attribute' do
+        create(:group, parent: container.parent, path: 'existing.wiki')
+        container.path = 'existing'
+
+        expect(container).not_to be_valid
+        expect(container.errors[:name].first).to eq(_('has already been taken'))
+      end
+    end
+  end
+end