Merge branch 'feature/runner-per-group' into 'master'

Shared CI runners for groups

See merge request gitlab-org/gitlab-ce!9646

app/controllers/projects/runners_controller.rb

@@ -52,6 +52,12 @@ class Projects::RunnersController < Projects::ApplicationController
     redirect_to project_settings_ci_cd_path(@project)
   end
 
+  def toggle_group_runners
+    project.toggle_ci_cd_settings!(:group_runners_enabled)
+
+    redirect_to project_settings_ci_cd_path(@project)
+  end
+
   protected
 
   def set_runner

app/controllers/projects/settings/ci_cd_controller.rb

@@ -67,10 +67,18 @@ module Projects
 
       def define_runners_variables
         @project_runners = @project.runners.ordered
-        @assignable_runners = current_user.ci_authorized_runners
-          .assignable_for(project).ordered.page(params[:page]).per(20)
+
+        @assignable_runners = current_user
+          .ci_authorized_runners
+          .assignable_for(project)
+          .ordered
+          .page(params[:page]).per(20)
+
         @shared_runners = ::Ci::Runner.shared.active
+
         @shared_runners_count = @shared_runners.count(:all)
+
+        @group_runners = ::Ci::Runner.belonging_to_parent_group_of_project(@project.id)
       end
 
       def define_secret_variables

app/models/ci/runner.rb

@@ -14,31 +14,49 @@ module Ci
     has_many :builds
     has_many :runner_projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
     has_many :projects, through: :runner_projects
+    has_many :runner_namespaces
+    has_many :groups, through: :runner_namespaces
 
     has_one :last_build, ->() { order('id DESC') }, class_name: 'Ci::Build'
 
     before_validation :set_default_values
 
-    scope :specific, ->() { where(is_shared: false) }
-    scope :shared, ->() { where(is_shared: true) }
-    scope :active, ->() { where(active: true) }
-    scope :paused, ->() { where(active: false) }
-    scope :online, ->() { where('contacted_at > ?', contact_time_deadline) }
-    scope :ordered, ->() { order(id: :desc) }
+    scope :specific, -> { where(is_shared: false) }
+    scope :shared, -> { where(is_shared: true) }
+    scope :active, -> { where(active: true) }
+    scope :paused, -> { where(active: false) }
+    scope :online, -> { where('contacted_at > ?', contact_time_deadline) }
+    scope :ordered, -> { order(id: :desc) }
 
-    scope :owned_or_shared, ->(project_id) do
-      joins('LEFT JOIN ci_runner_projects ON ci_runner_projects.runner_id = ci_runners.id')
-        .where("ci_runner_projects.project_id = :project_id OR ci_runners.is_shared = true", project_id: project_id)
+    scope :belonging_to_project, -> (project_id) {
+      joins(:runner_projects).where(ci_runner_projects: { project_id: project_id })
+    }
+
+    scope :belonging_to_parent_group_of_project, -> (project_id) {
+      project_groups = ::Group.joins(:projects).where(projects: { id: project_id })
+      hierarchy_groups = Gitlab::GroupHierarchy.new(project_groups).base_and_ancestors
+
+      joins(:groups).where(namespaces: { id: hierarchy_groups })
+    }
+
+    scope :owned_or_shared, -> (project_id) do
+      union = Gitlab::SQL::Union.new(
+        [belonging_to_project(project_id), belonging_to_parent_group_of_project(project_id), shared],
+        remove_duplicates: false
+      )
+      from("(#{union.to_sql}) ci_runners")
     end
 
     scope :assignable_for, ->(project) do
       # FIXME: That `to_sql` is needed to workaround a weird Rails bug.
       #        Without that, placeholders would miss one and couldn't match.
       where(locked: false)
-        .where.not("id IN (#{project.runners.select(:id).to_sql})").specific
+        .where.not("ci_runners.id IN (#{project.runners.select(:id).to_sql})")
+        .specific
     end
 
     validate :tag_constraints
+    validate :either_projects_or_group
     validates :access_level, presence: true
 
     acts_as_taggable
@@ -50,6 +68,12 @@ module Ci
       ref_protected: 1
     }
 
+    enum runner_type: {
+      instance_type: 1,
+      group_type: 2,
+      project_type: 3
+    }
+
     cached_attr_reader :version, :revision, :platform, :architecture, :contacted_at, :ip_address
 
     chronic_duration_attr :maximum_timeout_human_readable, :maximum_timeout
@@ -120,6 +144,14 @@ module Ci
       !shared?
     end
 
+    def assigned_to_group?
+      runner_namespaces.any?
+    end
+
+    def assigned_to_project?
+      runner_projects.any?
+    end
+
     def can_pick?(build)
       return false if self.ref_protected? && !build.protected?
 
@@ -174,6 +206,12 @@ module Ci
       end
     end
 
+    def pick_build!(build)
+      if can_pick?(build)
+        tick_runner_queue
+      end
+    end
+
     private
 
     def cleanup_runner_queue
@@ -205,7 +243,17 @@ module Ci
     end
 
     def assignable_for?(project_id)
-      is_shared? || projects.exists?(id: project_id)
+      self.class.owned_or_shared(project_id).where(id: self.id).any?
+    end
+
+    def either_projects_or_group
+      if groups.many?
+        errors.add(:runner, 'can only be assigned to one group')
+      end
+
+      if assigned_to_group? && assigned_to_project?
+        errors.add(:runner, 'can only be assigned either to projects or to a group')
+      end
     end
 
     def accepting_tags?(build)

app/models/ci/runner_namespace.rb

+module Ci
+  class RunnerNamespace < ActiveRecord::Base
+    extend Gitlab::Ci::Model
+
+    belongs_to :runner
+    belongs_to :namespace, class_name: '::Namespace'
+    belongs_to :group, class_name: '::Group', foreign_key: :namespace_id
+  end
+end

app/models/group.rb

@@ -9,6 +9,7 @@ class Group < Namespace
   include SelectForProjectAuthorization
   include LoadedInGroupList
   include GroupDescendant
+  include TokenAuthenticatable
 
   has_many :group_members, -> { where(requested_at: nil) }, dependent: :destroy, as: :source # rubocop:disable Cop/ActiveRecordDependent
   alias_method :members, :group_members
@@ -43,6 +44,8 @@ class Group < Namespace
 
   validates :two_factor_grace_period, presence: true, numericality: { greater_than_or_equal_to: 0 }
 
+  add_authentication_token_field :runners_token
+
   after_create :post_create_hook
   after_destroy :post_destroy_hook
   after_save :update_two_factor_requirement
@@ -294,6 +297,13 @@ class Group < Namespace
     refresh_members_authorized_projects(blocking: false)
   end
 
+  # each existing group needs to have a `runners_token`.
+  # we do this on read since migrating all existing groups is not a feasible
+  # solution.
+  def runners_token
+    ensure_runners_token!
+  end
+
   private
 
   def update_two_factor_requirement

app/models/namespace.rb

@@ -21,6 +21,9 @@ class Namespace < ActiveRecord::Base
   has_many :projects, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
   has_many :project_statistics
 
+  has_many :runner_namespaces, class_name: 'Ci::RunnerNamespace'
+  has_many :runners, through: :runner_namespaces, source: :runner, class_name: 'Ci::Runner'
+
   # This should _not_ be `inverse_of: :namespace`, because that would also set
   # `user.namespace` when this user creates a group with themselves as `owner`.
   belongs_to :owner, class_name: "User"

app/models/project.rb

@@ -230,13 +230,11 @@ class Project < ActiveRecord::Base
   has_many :project_deploy_tokens
   has_many :deploy_tokens, through: :project_deploy_tokens
 
-  has_many :active_runners, -> { active }, through: :runner_projects, source: :runner, class_name: 'Ci::Runner'
-
   has_one :auto_devops, class_name: 'ProjectAutoDevops'
   has_many :custom_attributes, class_name: 'ProjectCustomAttribute'
 
   has_many :project_badges, class_name: 'ProjectBadge'
-  has_one :ci_cd_settings, class_name: 'ProjectCiCdSetting'
+  has_one :ci_cd_settings, class_name: 'ProjectCiCdSetting', inverse_of: :project, autosave: true
 
   accepts_nested_attributes_for :variables, allow_destroy: true
   accepts_nested_attributes_for :project_feature, update_only: true
@@ -247,6 +245,7 @@ class Project < ActiveRecord::Base
   delegate :members, to: :team, prefix: true
   delegate :add_user, :add_users, to: :team
   delegate :add_guest, :add_reporter, :add_developer, :add_master, :add_role, to: :team
+  delegate :group_runners_enabled, :group_runners_enabled=, :group_runners_enabled?, to: :ci_cd_settings
 
   # Validations
   validates :creator, presence: true, on: :create
@@ -332,6 +331,11 @@ class Project < ActiveRecord::Base
   scope :with_issues_available_for_user, ->(current_user) { with_feature_available_for_user(:issues, current_user) }
   scope :with_merge_requests_enabled, -> { with_feature_enabled(:merge_requests) }
 
+  scope :with_group_runners_enabled, -> do
+    joins(:ci_cd_settings)
+    .where(project_ci_cd_settings: { group_runners_enabled: true })
+  end
+
   enum auto_cancel_pending_pipelines: { disabled: 0, enabled: 1 }
 
   chronic_duration_attr :build_timeout_human_readable, :build_timeout, default: 3600
@@ -1301,12 +1305,17 @@ class Project < ActiveRecord::Base
     @shared_runners ||= shared_runners_available? ? Ci::Runner.shared : Ci::Runner.none
   end
 
-  def active_shared_runners
-    @active_shared_runners ||= shared_runners.active
+  def group_runners
+    @group_runners ||= group_runners_enabled? ? Ci::Runner.belonging_to_parent_group_of_project(self.id) : Ci::Runner.none
+  end
+
+  def all_runners
+    union = Gitlab::SQL::Union.new([runners, group_runners, shared_runners])
+    Ci::Runner.from("(#{union.to_sql}) ci_runners")
   end
 
   def any_runners?(&block)
-    active_runners.any?(&block) || active_shared_runners.any?(&block)
+    all_runners.active.any?(&block)
   end
 
   def valid_runners_token?(token)
@@ -1874,6 +1883,10 @@ class Project < ActiveRecord::Base
     []
   end
 
+  def toggle_ci_cd_settings!(settings_attribute)
+    ci_cd_settings.toggle!(settings_attribute)
+  end
+
   def gitlab_deploy_token
     @gitlab_deploy_token ||= deploy_tokens.gitlab_deploy_token
   end

app/models/project_ci_cd_setting.rb

 class ProjectCiCdSetting < ActiveRecord::Base
-  belongs_to :project
+  belongs_to :project, inverse_of: :ci_cd_settings
 
   # The version of the schema that first introduced this model/table.
   MINIMUM_SCHEMA_VERSION = 20180403035759

app/services/ci/register_job_service.rb

@@ -17,8 +17,10 @@ module Ci
       builds =
         if runner.shared?
           builds_for_shared_runner
+        elsif runner.group_type?
+          builds_for_group_runner
         else
-          builds_for_specific_runner
+          builds_for_project_runner
         end
 
       valid = true
@@ -75,15 +77,24 @@ module Ci
         .joins('LEFT JOIN project_features ON ci_builds.project_id = project_features.project_id')
         .where('project_features.builds_access_level IS NULL or project_features.builds_access_level > 0').
 
-        # Implement fair scheduling
-        # this returns builds that are ordered by number of running builds
-        # we prefer projects that don't use shared runners at all
-        joins("LEFT JOIN (#{running_builds_for_shared_runners.to_sql}) AS project_builds ON ci_builds.project_id=project_builds.project_id")
+      # Implement fair scheduling
+      # this returns builds that are ordered by number of running builds
+      # we prefer projects that don't use shared runners at all
+      joins("LEFT JOIN (#{running_builds_for_shared_runners.to_sql}) AS project_builds ON ci_builds.project_id=project_builds.project_id")
         .order('COALESCE(project_builds.running_builds, 0) ASC', 'ci_builds.id ASC')
     end
 
-    def builds_for_specific_runner
-      new_builds.where(project: runner.projects.without_deleted.with_builds_enabled).order('created_at ASC')
+    def builds_for_project_runner
+      new_builds.where(project: runner.projects.without_deleted.with_builds_enabled).order('id ASC')
+    end
+
+    def builds_for_group_runner
+      hierarchy_groups = Gitlab::GroupHierarchy.new(runner.groups).base_and_descendants
+      projects = Project.where(namespace_id: hierarchy_groups)
+        .with_group_runners_enabled
+        .with_builds_enabled
+        .without_deleted
+      new_builds.where(project: projects).order('id ASC')
     end
 
     def running_builds_for_shared_runners
@@ -97,10 +108,6 @@ module Ci
       builds
     end
 
-    def shared_runner_build_limits_feature_enabled?
-      ENV['DISABLE_SHARED_RUNNER_BUILD_MINUTES_LIMIT'].to_s != 'true'
-    end
-
     def register_failure
       failed_attempt_counter.increment
       attempt_counter.increment

app/services/ci/update_build_queue_service.rb

 module Ci
   class UpdateBuildQueueService
     def execute(build)
-      build.project.runners.each do |runner|
-        if runner.can_pick?(build)
-          runner.tick_runner_queue
-        end
-      end
+      tick_for(build, build.project.all_runners)
+    end
 
-      return unless build.project.shared_runners_enabled?
+    private
 
-      Ci::Runner.shared.each do |runner|
-        if runner.can_pick?(build)
-          runner.tick_runner_queue
-        end
+    def tick_for(build, runners)
+      runners.each do |runner|
+        runner.pick_build!(build)
       end
     end
   end

app/views/admin/runners/_runner.html.haml

@@ -2,6 +2,8 @@
   %td
     - if runner.shared?
       %span.label.label-success shared
+    - elsif runner.group_type?
+      %span.label.label-success group
     - else
       %span.label.label-info specific
     - if runner.locked?
@@ -19,7 +21,7 @@
   %td
     = runner.ip_address
   %td
-    - if runner.shared?
+    - if runner.shared? || runner.group_type?
       n/a
     - else
       = runner.projects.count(:all)

app/views/admin/runners/index.html.haml

@@ -16,6 +16,9 @@
         %li
           %span.label.label-success shared
           \- Runner runs jobs from all unassigned projects
+        %li
+          %span.label.label-success group
+          \- Runner runs jobs from all unassigned projects in its group
         %li
           %span.label.label-info specific
           \- Runner runs jobs from assigned projects

app/views/admin/runners/show.html.haml

@@ -19,6 +19,9 @@
     %p
       If you want Runners to build only specific projects, enable them in the table below.
       Keep in mind that this is a one way transition.
+- elsif @runner.group_type?
+  .bs-callout.bs-callout-success
+    %h4 This runner will process jobs from all projects in its group and subgroups
 - else
   .bs-callout.bs-callout-info
     %h4 This Runner will process jobs only from ASSIGNED projects

app/views/projects/runners/_group_runners.html.haml

+%h3 Group Runners
+
+.bs-callout.bs-callout-warning
+  GitLab Group Runners can execute code for all the projects in this group.
+  They can be managed using the #{link_to 'Runners API', help_page_path('api/runners.md')}.
+
+  - if @project.group
+    %hr
+    - if @project.group_runners_enabled?
+      = link_to toggle_group_runners_project_runners_path(@project), class: 'btn btn-warning', method: :post do
+        Disable group Runners
+    - else
+      = link_to toggle_group_runners_project_runners_path(@project), class: 'btn btn-success', method: :post do
+        Enable group Runners
+      for this project
+
+- if !@project.group
+  This project does not belong to a group and can therefore not make use of group Runners.
+
+- elsif @group_runners.empty?
+  This group does not provide any group Runners yet.
+
+  - if can?(current_user, :admin_pipeline, @project.group)
+    = render partial: 'ci/runner/how_to_setup_runner',
+             locals: { registration_token: @project.group.runners_token, type: 'group' }
+  - else
+    Ask your group master to setup a group Runner.
+
+- else
+  %h4.underlined-title Available group Runners : #{@group_runners.count}
+  %ul.bordered-list
+    = render partial: 'projects/runners/runner', collection: @group_runners, as: :runner

app/views/projects/runners/_index.html.haml

@@ -23,3 +23,7 @@
     = render 'projects/runners/specific_runners'
   .col-sm-6
     = render 'projects/runners/shared_runners'
+.row
+  .col-sm-6
+  .col-sm-6
+    = render 'projects/runners/group_runners'

app/views/projects/runners/_runner.html.haml

@@ -26,7 +26,7 @@
         - else
           - runner_project = @project.runner_projects.find_by(runner_id: runner)
           = link_to 'Disable for this project', project_runner_project_path(@project, runner_project), data: { confirm: "Are you sure?" }, method: :delete, class: 'btn btn-danger btn-sm'
-      - elsif runner.specific?
+      - elsif !(runner.is_shared? || runner.group_type?) # We can simplify this to `runner.project_type?` when migrating #runner_type is complete
         = form_for [@project.namespace.becomes(Namespace), @project, @project.runner_projects.new] do |f|
           = f.hidden_field :runner_id, value: runner.id
           = f.submit 'Enable for this project', class: 'btn btn-sm'

changelogs/unreleased/feature-runner-per-group.yml

+---
+title: Allow group masters to configure runners for groups
+merge_request: 9646
+author: Alexis Reigel
+type: added

config/routes/project.rb

@@ -409,6 +409,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
 
         collection do
           post :toggle_shared_runners
+          post :toggle_group_runners
         end
       end
 

db/migrate/20170301101006_add_ci_runner_namespaces.rb

+class AddCiRunnerNamespaces < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    create_table :ci_runner_namespaces do |t|
+      t.integer :runner_id
+      t.integer :namespace_id
+
+      t.index [:runner_id, :namespace_id], unique: true
+      t.index :namespace_id
+      t.foreign_key :ci_runners, column: :runner_id, on_delete: :cascade
+      t.foreign_key :namespaces, column: :namespace_id, on_delete: :cascade
+    end
+  end
+end

db/migrate/20170906133745_add_runners_token_to_groups.rb

+class AddRunnersTokenToGroups < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :namespaces, :runners_token, :string
+  end
+end

db/migrate/20180430101916_add_runner_type_to_ci_runners.rb

+class AddRunnerTypeToCiRunners < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    add_column :ci_runners, :runner_type, :smallint
+  end
+end

db/migrate/20180503150427_add_index_to_namespaces_runners_token.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIndexToNamespacesRunnersToken < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :namespaces, :runners_token, unique: true
+  end
+
+  def down
+    if index_exists?(:namespaces, :runners_token, unique: true)
+      remove_index :namespaces, :runners_token
+    end
+  end
+end

db/post_migrate/20180430143705_backfill_runner_type_for_ci_runners_post_migrate.rb

+class BackfillRunnerTypeForCiRunnersPostMigrate < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  INSTANCE_RUNNER_TYPE = 1
+  PROJECT_RUNNER_TYPE = 3
+
+  disable_ddl_transaction!
+
+  def up
+    update_column_in_batches(:ci_runners, :runner_type, INSTANCE_RUNNER_TYPE) do |table, query|
+      query.where(table[:is_shared].eq(true)).where(table[:runner_type].eq(nil))
+    end
+
+    update_column_in_batches(:ci_runners, :runner_type, PROJECT_RUNNER_TYPE) do |table, query|
+      query.where(table[:is_shared].eq(false)).where(table[:runner_type].eq(nil))
+    end
+  end
+
+  def down
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180425131009) do
+ActiveRecord::Schema.define(version: 20180503150427) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -444,6 +444,14 @@ ActiveRecord::Schema.define(version: 20180425131009) do
   add_index "ci_pipelines", ["status"], name: "index_ci_pipelines_on_status", using: :btree
   add_index "ci_pipelines", ["user_id"], name: "index_ci_pipelines_on_user_id", using: :btree
 
+  create_table "ci_runner_namespaces", force: :cascade do |t|
+    t.integer "runner_id"
+    t.integer "namespace_id"
+  end
+
+  add_index "ci_runner_namespaces", ["namespace_id"], name: "index_ci_runner_namespaces_on_namespace_id", using: :btree
+  add_index "ci_runner_namespaces", ["runner_id", "namespace_id"], name: "index_ci_runner_namespaces_on_runner_id_and_namespace_id", unique: true, using: :btree
+
   create_table "ci_runner_projects", force: :cascade do |t|
     t.integer "runner_id", null: false
     t.datetime "created_at"
@@ -472,6 +480,7 @@ ActiveRecord::Schema.define(version: 20180425131009) do
     t.integer "access_level", default: 0, null: false
     t.string "ip_address"
     t.integer "maximum_timeout"
+    t.integer "runner_type", limit: 2
   end
 
   add_index "ci_runners", ["contacted_at"], name: "index_ci_runners_on_contacted_at", using: :btree
@@ -1261,6 +1270,7 @@ ActiveRecord::Schema.define(version: 20180425131009) do
     t.boolean "require_two_factor_authentication", default: false, null: false
     t.integer "two_factor_grace_period", default: 48, null: false
     t.integer "cached_markdown_version"
+    t.string "runners_token"
   end
 
   add_index "namespaces", ["created_at"], name: "index_namespaces_on_created_at", using: :btree
@@ -1271,6 +1281,7 @@ ActiveRecord::Schema.define(version: 20180425131009) do
   add_index "namespaces", ["path"], name: "index_namespaces_on_path", using: :btree
   add_index "namespaces", ["path"], name: "index_namespaces_on_path_trigram", using: :gin, opclasses: {"path"=>"gin_trgm_ops"}
   add_index "namespaces", ["require_two_factor_authentication"], name: "index_namespaces_on_require_two_factor_authentication", using: :btree
+  add_index "namespaces", ["runners_token"], name: "index_namespaces_on_runners_token", unique: true, using: :btree
   add_index "namespaces", ["type"], name: "index_namespaces_on_type", using: :btree
 
   create_table "notes", force: :cascade do |t|
@@ -2087,6 +2098,8 @@ ActiveRecord::Schema.define(version: 20180425131009) do
   add_foreign_key "ci_pipelines", "ci_pipeline_schedules", column: "pipeline_schedule_id", name: "fk_3d34ab2e06", on_delete: :nullify
   add_foreign_key "ci_pipelines", "ci_pipelines", column: "auto_canceled_by_id", name: "fk_262d4c2d19", on_delete: :nullify
   add_foreign_key "ci_pipelines", "projects", name: "fk_86635dbd80", on_delete: :cascade
+  add_foreign_key "ci_runner_namespaces", "ci_runners", column: "runner_id", on_delete: :cascade
+  add_foreign_key "ci_runner_namespaces", "namespaces", on_delete: :cascade
   add_foreign_key "ci_runner_projects", "projects", name: "fk_4478a6f1e4", on_delete: :cascade
   add_foreign_key "ci_stages", "ci_pipelines", column: "pipeline_id", name: "fk_fb57e6cc56", on_delete: :cascade
   add_foreign_key "ci_stages", "projects", name: "fk_2360681d1d", on_delete: :cascade

lib/api/entities.rb

@@ -242,13 +242,18 @@ module API
       expose :requested_at
     end
 
-    class Group < Grape::Entity
-      expose :id, :name, :path, :description, :visibility
+    class BasicGroupDetails < Grape::Entity
+      expose :id
+      expose :web_url
+      expose :name
+    end
+
+    class Group < BasicGroupDetails
+      expose :path, :description, :visibility
       expose :lfs_enabled?, as: :lfs_enabled
       expose :avatar_url do |group, options|
         group.avatar_url(only_path: false)
       end
-      expose :web_url
       expose :request_access_enabled
       expose :full_name, :full_path
 
@@ -984,6 +989,13 @@ module API
           options[:current_user].authorized_projects.where(id: runner.projects)
         end
       end
+      expose :groups, with: Entities::BasicGroupDetails do |runner, options|
+        if options[:current_user].admin?
+          runner.groups
+        else
+          options[:current_user].authorized_groups.where(id: runner.groups)
+        end
+      end
     end
 
     class RunnerRegistrationDetails < Grape::Entity

lib/api/runner.rb

@@ -23,10 +23,13 @@ module API
         runner =
           if runner_registration_token_valid?
             # Create shared runner. Requires admin access
-            Ci::Runner.create(attributes.merge(is_shared: true))
+            Ci::Runner.create(attributes.merge(is_shared: true, runner_type: :instance_type))
           elsif project = Project.find_by(runners_token: params[:token])
-            # Create a specific runner for project.
-            project.runners.create(attributes)
+            # Create a specific runner for the project
+            project.runners.create(attributes.merge(runner_type: :project_type))
+          elsif group = Group.find_by(runners_token: params[:token])
+            # Create a specific runner for the group
+            group.runners.create(attributes.merge(runner_type: :group_type))
           end
 
         break forbidden! unless runner

spec/controllers/projects/settings/ci_cd_controller_spec.rb

@@ -17,6 +17,23 @@ describe Projects::Settings::CiCdController do
       expect(response).to have_gitlab_http_status(200)
       expect(response).to render_template(:show)
     end
+
+    context 'with group runners' do
+      let(:group_runner) { create(:ci_runner) }
+      let(:parent_group) { create(:group) }
+      let(:group) { create(:group, runners: [group_runner], parent: parent_group) }
+      let(:other_project) { create(:project, group: group) }
+      let!(:project_runner) { create(:ci_runner, projects: [other_project]) }
+      let!(:shared_runner) { create(:ci_runner, :shared) }
+
+      it 'sets assignable project runners only' do
+        group.add_master(user)
+
+        get :show, namespace_id: project.namespace, project_id: project
+
+        expect(assigns(:assignable_runners)).to eq [project_runner]
+      end
+    end
   end
 
   describe '#reset_cache' do

spec/factories/projects.rb

@@ -15,14 +15,18 @@ FactoryBot.define do
     namespace
     creator { group ? create(:user) : namespace&.owner }
 
-    # Nest Project Feature attributes
     transient do
+      # Nest Project Feature attributes
       wiki_access_level ProjectFeature::ENABLED
       builds_access_level ProjectFeature::ENABLED
       snippets_access_level ProjectFeature::ENABLED
       issues_access_level ProjectFeature::ENABLED
       merge_requests_access_level ProjectFeature::ENABLED
       repository_access_level ProjectFeature::ENABLED
+
+      # we can't assign the delegated `#ci_cd_settings` attributes directly, as the
+      # `#ci_cd_settings` relation needs to be created first
+      group_runners_enabled nil
     end
 
     after(:create) do |project, evaluator|
@@ -47,6 +51,9 @@ FactoryBot.define do
       end
 
       project.group&.refresh_members_authorized_projects
+
+      # assign the delegated `#ci_cd_settings` attributes after create
+      project.reload.group_runners_enabled = evaluator.group_runners_enabled unless evaluator.group_runners_enabled.nil?
     end
 
     trait :public do

spec/features/admin/admin_runners_spec.rb

@@ -59,6 +59,47 @@ describe "Admin Runners" do
         expect(page).to have_text 'No runners found'
       end
     end
+
+    context 'group runner' do
+      let(:group) { create(:group) }
+      let!(:runner) { create(:ci_runner, groups: [group], runner_type: :group_type) }
+
+      it 'shows the label and does not show the project count' do
+        visit admin_runners_path
+
+        within "#runner_#{runner.id}" do
+          expect(page).to have_selector '.label', text: 'group'
+          expect(page).to have_text 'n/a'
+        end
+      end
+    end
+
+    context 'shared runner' do
+      it 'shows the label and does not show the project count' do
+        runner = create :ci_runner, :shared
+
+        visit admin_runners_path
+
+        within "#runner_#{runner.id}" do
+          expect(page).to have_selector '.label', text: 'shared'
+          expect(page).to have_text 'n/a'
+        end
+      end
+    end
+
+    context 'specific runner' do
+      it 'shows the label and the project count' do
+        project = create :project
+        runner = create :ci_runner, projects: [project]
+
+        visit admin_runners_path
+
+        within "#runner_#{runner.id}" do
+          expect(page).to have_selector '.label', text: 'specific'
+          expect(page).to have_text '1'
+        end
+      end
+    end
   end
 
   describe "Runner show page" do

spec/features/runners_spec.rb

@@ -181,4 +181,84 @@ feature 'Runners' do
       expect(page.find('.shared-runners-description')).to have_content('Disable shared Runners')
     end
   end
+
+  context 'group runners' do
+    background do
+      project.add_master(user)
+    end
+
+    given(:group) { create :group }
+
+    context 'as project and group master' do
+      background do
+        group.add_master(user)
+      end
+
+      context 'project with a group but no group runner' do
+        given(:project) { create :project, group: group }
+
+        scenario 'group runners are not available' do
+          visit runners_path(project)
+
+          expect(page).to have_content 'This group does not provide any group Runners yet.'
+
+          expect(page).to have_content 'Setup a group Runner manually'
+          expect(page).not_to have_content 'Ask your group master to setup a group Runner.'
+        end
+      end
+    end
+
+    context 'as project master' do
+      context 'project without a group' do
+        given(:project) { create :project }
+
+        scenario 'group runners are not available' do
+          visit runners_path(project)
+
+          expect(page).to have_content 'This project does not belong to a group and can therefore not make use of group Runners.'
+        end
+      end
+
+      context 'project with a group but no group runner' do
+        given(:group) { create :group }
+        given(:project) { create :project, group: group }
+
+        scenario 'group runners are not available' do
+          visit runners_path(project)
+
+          expect(page).to have_content 'This group does not provide any group Runners yet.'
+
+          expect(page).not_to have_content 'Setup a group Runner manually'
+          expect(page).to have_content 'Ask your group master to setup a group Runner.'
+        end
+      end
+
+      context 'project with a group and a group runner' do
+        given(:group) { create :group }
+        given(:project) { create :project, group: group }
+        given!(:ci_runner) { create :ci_runner, groups: [group], description: 'group-runner' }
+
+        scenario 'group runners are available' do
+          visit runners_path(project)
+
+          expect(page).to have_content 'Available group Runners : 1'
+          expect(page).to have_content 'group-runner'
+        end
+
+        scenario 'group runners may be disabled for a project' do
+          visit runners_path(project)
+
+          click_on 'Disable group Runners'
+
+          expect(page).to have_content 'Enable group Runners'
+          expect(project.reload.group_runners_enabled).to be false
+
+          click_on 'Enable group Runners'
+
+          expect(page).to have_content 'Disable group Runners'
+          expect(project.reload.group_runners_enabled).to be true
+        end
+      end
+    end
+  end
 end

spec/lib/gitlab/import_export/all_models.yml

@@ -258,7 +258,6 @@ project:
 - builds
 - runner_projects
 - runners
-- active_runners
 - variables
 - triggers
 - pipeline_schedules
@@ -286,6 +285,7 @@ project:
 - internal_ids
 - project_deploy_tokens
 - deploy_tokens
+- settings
 - ci_cd_settings
 award_emoji:
 - awardable

spec/models/ci/runner_spec.rb

@@ -19,6 +19,63 @@ describe Ci::Runner do
         end
       end
     end
+
+    context 'either_projects_or_group' do
+      let(:group) { create(:group) }
+
+      it 'disallows assigning to a group if already assigned to a group' do
+        runner = create(:ci_runner, groups: [group])
+
+        runner.groups << build(:group)
+
+        expect(runner).not_to be_valid
+        expect(runner.errors.full_messages).to eq ['Runner can only be assigned to one group']
+      end
+
+      it 'disallows assigning to a group if already assigned to a project' do
+        project = create(:project)
+        runner = create(:ci_runner, projects: [project])
+
+        runner.groups << build(:group)
+
+        expect(runner).not_to be_valid
+        expect(runner.errors.full_messages).to eq ['Runner can only be assigned either to projects or to a group']
+      end
+
+      it 'disallows assigning to a project if already assigned to a group' do
+        runner = create(:ci_runner, groups: [group])
+
+        runner.projects << build(:project)
+
+        expect(runner).not_to be_valid
+        expect(runner.errors.full_messages).to eq ['Runner can only be assigned either to projects or to a group']
+      end
+
+      it 'allows assigning to a group if not assigned to a group nor a project' do
+        runner = create(:ci_runner)
+
+        runner.groups << build(:group)
+
+        expect(runner).to be_valid
+      end
+
+      it 'allows assigning to a project if not assigned to a group nor a project' do
+        runner = create(:ci_runner)
+
+        runner.projects << build(:project)
+
+        expect(runner).to be_valid
+      end
+
+      it 'allows assigning to a project if already assigned to a project' do
+        project = create(:project)
+        runner = create(:ci_runner, projects: [project])
+
+        runner.projects << build(:project)
+
+        expect(runner).to be_valid
+      end
+    end
   end
 
   describe '#access_level' do
@@ -49,6 +106,80 @@ describe Ci::Runner do
     end
   end
 
+  describe '.shared' do
+    let(:group) { create(:group) }
+    let(:project) { create(:project) }
+
+    it 'returns the shared group runner' do
+      runner = create(:ci_runner, :shared, groups: [group])
+
+      expect(described_class.shared).to eq [runner]
+    end
+
+    it 'returns the shared project runner' do
+      runner = create(:ci_runner, :shared, projects: [project])
+
+      expect(described_class.shared).to eq [runner]
+    end
+  end
+
+  describe '.belonging_to_project' do
+    it 'returns the specific project runner' do
+      # own
+      specific_project = create(:project)
+      specific_runner = create(:ci_runner, :specific, projects: [specific_project])
+
+      # other
+      other_project = create(:project)
+      create(:ci_runner, :specific, projects: [other_project])
+
+      expect(described_class.belonging_to_project(specific_project.id)).to eq [specific_runner]
+    end
+  end
+
+  describe '.belonging_to_parent_group_of_project' do
+    let(:project) { create(:project, group: group) }
+    let(:group) { create(:group) }
+    let(:runner) { create(:ci_runner, :specific, groups: [group]) }
+    let!(:unrelated_group) { create(:group) }
+    let!(:unrelated_project) { create(:project, group: unrelated_group) }
+    let!(:unrelated_runner) { create(:ci_runner, :specific, groups: [unrelated_group]) }
+
+    it 'returns the specific group runner' do
+      expect(described_class.belonging_to_parent_group_of_project(project.id)).to contain_exactly(runner)
+    end
+
+    context 'with a parent group with a runner', :nested_groups do
+      let(:runner) { create(:ci_runner, :specific, groups: [parent_group]) }
+      let(:project) { create(:project, group: group) }
+      let(:group) { create(:group, parent: parent_group) }
+      let(:parent_group) { create(:group) }
+
+      it 'returns the group runner from the parent group' do
+        expect(described_class.belonging_to_parent_group_of_project(project.id)).to contain_exactly(runner)
+      end
+    end
+  end
+
+  describe '.owned_or_shared' do
+    it 'returns a globally shared, a project specific and a group specific runner' do
+      # group specific
+      group = create(:group)
+      project = create(:project, group: group)
+      group_runner = create(:ci_runner, :specific, groups: [group])
+
+      # project specific
+      project_runner = create(:ci_runner, :specific, projects: [project])
+
+      # globally shared
+      shared_runner = create(:ci_runner, :shared)
+
+      expect(described_class.owned_or_shared(project.id)).to contain_exactly(
+        group_runner, project_runner, shared_runner
+      )
+    end
+  end
+
   describe '#display_name' do
     it 'returns the description if it has a value' do
       runner = FactoryBot.build(:ci_runner, description: 'Linux/Ruby-1.9.3-p448')
@@ -163,7 +294,9 @@ describe Ci::Runner do
   describe '#can_pick?' do
     let(:pipeline) { create(:ci_pipeline) }
     let(:build) { create(:ci_build, pipeline: pipeline) }
-    let(:runner) { create(:ci_runner) }
+    let(:runner) { create(:ci_runner, tag_list: tag_list, run_untagged: run_untagged) }
+    let(:tag_list) { [] }
+    let(:run_untagged) { true }
 
     subject { runner.can_pick?(build) }
 
@@ -171,6 +304,13 @@ describe Ci::Runner do
       build.project.runners << runner
     end
 
+    context 'a different runner' do
+      it 'cannot handle builds' do
+        other_runner = create(:ci_runner)
+        expect(other_runner.can_pick?(build)).to be_falsey
+      end
+    end
+
     context 'when runner does not have tags' do
       it 'can handle builds without tags' do
         expect(runner.can_pick?(build)).to be_truthy
@@ -184,9 +324,7 @@ describe Ci::Runner do
     end
 
     context 'when runner has tags' do
-      before do
-        runner.tag_list = %w(bb cc)
-      end
+      let(:tag_list) { %w(bb cc) }
 
       shared_examples 'tagged build picker' do
         it 'can handle build with matching tags' do
@@ -211,9 +349,7 @@ describe Ci::Runner do
       end
 
       context 'when runner cannot pick untagged jobs' do
-        before do
-          runner.run_untagged = false
-        end
+        let(:run_untagged) { false }
 
         it 'cannot handle builds without tags' do
           expect(runner.can_pick?(build)).to be_falsey
@@ -224,8 +360,9 @@ describe Ci::Runner do
     end
 
     context 'when runner is shared' do
+      let(:runner) { create(:ci_runner, :shared) }
+
       before do
-        runner.is_shared = true
         build.project.runners = []
       end
 
@@ -234,9 +371,7 @@ describe Ci::Runner do
       end
 
       context 'when runner is locked' do
-        before do
-          runner.locked = true
-        end
+        let(:runner) { create(:ci_runner, :shared, locked: true) }
 
         it 'can handle builds' do
           expect(runner.can_pick?(build)).to be_truthy
@@ -260,6 +395,17 @@ describe Ci::Runner do
           expect(runner.can_pick?(build)).to be_falsey
         end
       end
+
+      context 'when runner is assigned to a group' do
+        before do
+          build.project.runners = []
+          runner.groups << create(:group, projects: [build.project])
+        end
+
+        it 'can handle builds' do
+          expect(runner.can_pick?(build)).to be_truthy
+        end
+      end
     end
 
     context 'when access_level of runner is not_protected' do
@@ -583,4 +729,76 @@ describe Ci::Runner do
       expect(described_class.search(runner.description.upcase)).to eq([runner])
     end
   end
+
+  describe '#assigned_to_group?' do
+    subject { runner.assigned_to_group? }
+
+    context 'when project runner' do
+      let(:runner) { create(:ci_runner, description: 'Project runner', projects: [project]) }
+      let(:project) { create(:project) }
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when shared runner' do
+      let(:runner) { create(:ci_runner, :shared, description: 'Shared runner') }
+
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when group runner' do
+      let(:group) { create(:group) }
+      let(:runner) { create(:ci_runner, description: 'Group runner', groups: [group]) }
+
+      it { is_expected.to be_truthy }
+    end
+  end
+
+  describe '#assigned_to_project?' do
+    subject { runner.assigned_to_project? }
+
+    context 'when group runner' do
+      let(:runner) { create(:ci_runner, description: 'Group runner', groups: [group]) }
+      let(:group) { create(:group) }
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when shared runner' do
+      let(:runner) { create(:ci_runner, :shared, description: 'Shared runner') }
+      it { is_expected.to be_falsey }
+    end
+
+    context 'when project runner' do
+      let(:runner) { create(:ci_runner, description: 'Group runner', projects: [project]) }
+      let(:project) { create(:project) }
+
+      it { is_expected.to be_truthy }
+    end
+  end
+
+  describe '#pick_build!' do
+    context 'runner can pick the build' do
+      it 'calls #tick_runner_queue' do
+        ci_build = build(:ci_build)
+        runner = build(:ci_runner)
+        allow(runner).to receive(:can_pick?).with(ci_build).and_return(true)
+
+        expect(runner).to receive(:tick_runner_queue)
+
+        runner.pick_build!(ci_build)
+      end
+    end
+
+    context 'runner cannot pick the build' do
+      it 'does not call #tick_runner_queue' do
+        ci_build = build(:ci_build)
+        runner = build(:ci_runner)
+        allow(runner).to receive(:can_pick?).with(ci_build).and_return(false)
+
+        expect(runner).not_to receive(:tick_runner_queue)
+
+        runner.pick_build!(ci_build)
+      end
+    end
+  end
 end

spec/models/project_spec.rb

@@ -63,7 +63,6 @@ describe Project do
     it { is_expected.to have_many(:build_trace_section_names)}
     it { is_expected.to have_many(:runner_projects) }
     it { is_expected.to have_many(:runners) }
-    it { is_expected.to have_many(:active_runners) }
     it { is_expected.to have_many(:variables) }
     it { is_expected.to have_many(:triggers) }
     it { is_expected.to have_many(:pages_domains) }
@@ -1139,45 +1138,106 @@ describe Project do
     end
   end
 
-  describe '#any_runners' do
-    let(:project) { create(:project, shared_runners_enabled: shared_runners_enabled) }
-    let(:specific_runner) { create(:ci_runner) }
-    let(:shared_runner) { create(:ci_runner, :shared) }
+  describe '#any_runners?' do
+    context 'shared runners' do
+      let(:project) { create :project, shared_runners_enabled: shared_runners_enabled }
+      let(:specific_runner) { create :ci_runner }
+      let(:shared_runner) { create :ci_runner, :shared }
 
-    context 'for shared runners disabled' do
-      let(:shared_runners_enabled) { false }
+      context 'for shared runners disabled' do
+        let(:shared_runners_enabled) { false }
 
-      it 'has no runners available' do
-        expect(project.any_runners?).to be_falsey
-      end
+        it 'has no runners available' do
+          expect(project.any_runners?).to be_falsey
+        end
 
-      it 'has a specific runner' do
-        project.runners << specific_runner
-        expect(project.any_runners?).to be_truthy
-      end
+        it 'has a specific runner' do
+          project.runners << specific_runner
+
+          expect(project.any_runners?).to be_truthy
+        end
+
+        it 'has a shared runner, but they are prohibited to use' do
+          shared_runner
+
+          expect(project.any_runners?).to be_falsey
+        end
+
+        it 'checks the presence of specific runner' do
+          project.runners << specific_runner
+
+          expect(project.any_runners? { |runner| runner == specific_runner }).to be_truthy
+        end
 
-      it 'has a shared runner, but they are prohibited to use' do
-        shared_runner
-        expect(project.any_runners?).to be_falsey
+        it 'returns false if match cannot be found' do
+          project.runners << specific_runner
+
+          expect(project.any_runners? { false }).to be_falsey
+        end
       end
 
-      it 'checks the presence of specific runner' do
-        project.runners << specific_runner
-        expect(project.any_runners? { |runner| runner == specific_runner }).to be_truthy
+      context 'for shared runners enabled' do
+        let(:shared_runners_enabled) { true }
+
+        it 'has a shared runner' do
+          shared_runner
+
+          expect(project.any_runners?).to be_truthy
+        end
+
+        it 'checks the presence of shared runner' do
+          shared_runner
+
+          expect(project.any_runners? { |runner| runner == shared_runner }).to be_truthy
+        end
+
+        it 'returns false if match cannot be found' do
+          shared_runner
+
+          expect(project.any_runners? { false }).to be_falsey
+        end
       end
     end
 
-    context 'for shared runners enabled' do
-      let(:shared_runners_enabled) { true }
+    context 'group runners' do
+      let(:project) { create :project, group_runners_enabled: group_runners_enabled }
+      let(:group) { create :group, projects: [project] }
+      let(:group_runner) { create :ci_runner, groups: [group] }
+
+      context 'for group runners disabled' do
+        let(:group_runners_enabled) { false }
+
+        it 'has no runners available' do
+          expect(project.any_runners?).to be_falsey
+        end
+
+        it 'has a group runner, but they are prohibited to use' do
+          group_runner
 
-      it 'has a shared runner' do
-        shared_runner
-        expect(project.any_runners?).to be_truthy
+          expect(project.any_runners?).to be_falsey
+        end
       end
 
-      it 'checks the presence of shared runner' do
-        shared_runner
-        expect(project.any_runners? { |runner| runner == shared_runner }).to be_truthy
+      context 'for group runners enabled' do
+        let(:group_runners_enabled) { true }
+
+        it 'has a group runner' do
+          group_runner
+
+          expect(project.any_runners?).to be_truthy
+        end
+
+        it 'checks the presence of group runner' do
+          group_runner
+
+          expect(project.any_runners? { |runner| runner == group_runner }).to be_truthy
+        end
+
+        it 'returns false if match cannot be found' do
+          group_runner
+
+          expect(project.any_runners? { false }).to be_falsey
+        end
       end
     end
   end
@@ -3541,6 +3601,18 @@ describe Project do
     end
   end
 
+  describe '#toggle_ci_cd_settings!' do
+    it 'toggles the value on #settings' do
+      project = create(:project, group_runners_enabled: false)
+
+      expect(project.group_runners_enabled).to be false
+
+      project.toggle_ci_cd_settings!(:group_runners_enabled)
+
+      expect(project.group_runners_enabled).to be true
+    end
+  end
+
   describe '#gitlab_deploy_token' do
     let(:project) { create(:project) }
 

spec/requests/api/runner_spec.rb

@@ -40,18 +40,36 @@ describe API::Runner do
           expect(json_response['token']).to eq(runner.token)
           expect(runner.run_untagged).to be true
           expect(runner.token).not_to eq(registration_token)
+          expect(runner).to be_instance_type
         end
 
         context 'when project token is used' do
           let(:project) { create(:project) }
 
-          it 'creates runner' do
+          it 'creates project runner' do
             post api('/runners'), token: project.runners_token
 
             expect(response).to have_gitlab_http_status 201
             expect(project.runners.size).to eq(1)
-            expect(Ci::Runner.first.token).not_to eq(registration_token)
-            expect(Ci::Runner.first.token).not_to eq(project.runners_token)
+            runner = Ci::Runner.first
+            expect(runner.token).not_to eq(registration_token)
+            expect(runner.token).not_to eq(project.runners_token)
+            expect(runner).to be_project_type
+          end
+        end
+
+        context 'when group token is used' do
+          let(:group) { create(:group) }
+
+          it 'creates a group runner' do
+            post api('/runners'), token: group.runners_token
+
+            expect(response).to have_http_status 201
+            expect(group.runners.size).to eq(1)
+            runner = Ci::Runner.first
+            expect(runner.token).not_to eq(registration_token)
+            expect(runner.token).not_to eq(group.runners_token)
+            expect(runner).to be_group_type
           end
         end
       end

spec/serializers/pipeline_serializer_spec.rb

@@ -118,7 +118,7 @@ describe PipelineSerializer do
         it 'verifies number of queries', :request_store do
           recorded = ActiveRecord::QueryRecorder.new { subject }
 
-          expect(recorded.count).to be_within(1).of(36)
+          expect(recorded.count).to be_within(1).of(44)
           expect(recorded.cached_count).to eq(0)
         end
       end

spec/services/ci/register_job_service_spec.rb

@@ -2,11 +2,13 @@ require 'spec_helper'
 
 module Ci
   describe RegisterJobService do
-    let!(:project) { FactoryBot.create :project, shared_runners_enabled: false }
-    let!(:pipeline) { FactoryBot.create :ci_pipeline, project: project }
-    let!(:pending_job) { FactoryBot.create :ci_build, pipeline: pipeline }
-    let!(:shared_runner) { FactoryBot.create(:ci_runner, is_shared: true) }
-    let!(:specific_runner) { FactoryBot.create(:ci_runner, is_shared: false) }
+    set(:group) { create(:group) }
+    set(:project) { create(:project, group: group, shared_runners_enabled: false, group_runners_enabled: false) }
+    set(:pipeline) { create(:ci_pipeline, project: project) }
+    let!(:shared_runner) { create(:ci_runner, is_shared: true) }
+    let!(:specific_runner) { create(:ci_runner, is_shared: false) }
+    let!(:group_runner) { create(:ci_runner, groups: [group], runner_type: :group_type) }
+    let!(:pending_job) { create(:ci_build, pipeline: pipeline) }
 
     before do
       specific_runner.assign_to(project)
@@ -150,7 +152,7 @@ module Ci
 
       context 'disallow when builds are disabled' do
         before do
-          project.update(shared_runners_enabled: true)
+          project.update(shared_runners_enabled: true, group_runners_enabled: true)
           project.project_feature.update_attribute(:builds_access_level, ProjectFeature::DISABLED)
         end
 
@@ -160,13 +162,90 @@ module Ci
           it { expect(build).to be_nil }
         end
 
-        context 'and uses specific runner' do
+        context 'and uses group runner' do
+          let(:build) { execute(group_runner) }
+
+          it { expect(build).to be_nil }
+        end
+
+        context 'and uses project runner' do
           let(:build) { execute(specific_runner) }
 
           it { expect(build).to be_nil }
         end
       end
 
+      context 'allow group runners' do
+        before do
+          project.update!(group_runners_enabled: true)
+        end
+
+        context 'for multiple builds' do
+          let!(:project2) { create :project, group_runners_enabled: true, group: group }
+          let!(:pipeline2) { create :ci_pipeline, project: project2 }
+          let!(:project3) { create :project, group_runners_enabled: true, group: group }
+          let!(:pipeline3) { create :ci_pipeline, project: project3 }
+
+          let!(:build1_project1) { pending_job }
+          let!(:build2_project1) { create :ci_build, pipeline: pipeline }
+          let!(:build3_project1) { create :ci_build, pipeline: pipeline }
+          let!(:build1_project2) { create :ci_build, pipeline: pipeline2 }
+          let!(:build2_project2) { create :ci_build, pipeline: pipeline2 }
+          let!(:build1_project3) { create :ci_build, pipeline: pipeline3 }
+
+          # these shouldn't influence the scheduling
+          let!(:unrelated_group) { create :group }
+          let!(:unrelated_project) { create :project, group_runners_enabled: true, group: unrelated_group }
+          let!(:unrelated_pipeline) { create :ci_pipeline, project: unrelated_project }
+          let!(:build1_unrelated_project) { create :ci_build, pipeline: unrelated_pipeline }
+          let!(:unrelated_group_runner) { create :ci_runner, groups: [unrelated_group] }
+
+          it 'does not consider builds from other group runners' do
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 6
+            execute(group_runner)
+
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 5
+            execute(group_runner)
+
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 4
+            execute(group_runner)
+
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 3
+            execute(group_runner)
+
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 2
+            execute(group_runner)
+
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 1
+            execute(group_runner)
+
+            expect(described_class.new(group_runner).send(:builds_for_group_runner).count).to eq 0
+            expect(execute(group_runner)).to be_nil
+          end
+        end
+
+        context 'group runner' do
+          let(:build) { execute(group_runner) }
+
+          it { expect(build).to be_kind_of(Build) }
+          it { expect(build).to be_valid }
+          it { expect(build).to be_running }
+          it { expect(build.runner).to eq(group_runner) }
+        end
+      end
+
+      context 'disallow group runners' do
+        before do
+          project.update!(group_runners_enabled: false)
+        end
+
+        context 'group runner' do
+          let(:build) { execute(group_runner) }
+
+          it { expect(build).to be_nil }
+        end
+      end
+
       context 'when first build is stalled' do
         before do
           pending_job.update(lock_version: 0)
@@ -178,7 +257,7 @@ module Ci
           let!(:other_build) { create :ci_build, pipeline: pipeline }
 
           before do
-            allow_any_instance_of(Ci::RegisterJobService).to receive(:builds_for_specific_runner)
+            allow_any_instance_of(Ci::RegisterJobService).to receive(:builds_for_project_runner)
               .and_return(Ci::Build.where(id: [pending_job, other_build]))
           end
 
@@ -190,7 +269,7 @@ module Ci
 
         context 'when single build is in queue' do
           before do
-            allow_any_instance_of(Ci::RegisterJobService).to receive(:builds_for_specific_runner)
+            allow_any_instance_of(Ci::RegisterJobService).to receive(:builds_for_project_runner)
               .and_return(Ci::Build.where(id: pending_job))
           end
 
@@ -201,7 +280,7 @@ module Ci
 
         context 'when there is no build in queue' do
           before do
-            allow_any_instance_of(Ci::RegisterJobService).to receive(:builds_for_specific_runner)
+            allow_any_instance_of(Ci::RegisterJobService).to receive(:builds_for_project_runner)
               .and_return(Ci::Build.none)
           end
 

spec/services/ci/update_build_queue_service_spec.rb

@@ -8,21 +8,19 @@ describe Ci::UpdateBuildQueueService do
   context 'when updating specific runners' do
     let(:runner) { create(:ci_runner) }
 
-    context 'when there are runner that can pick build' do
+    context 'when there is a runner that can pick build' do
       before do
         build.project.runners << runner
       end
 
       it 'ticks runner queue value' do
-        expect { subject.execute(build) }
-          .to change { runner.ensure_runner_queue_value }
+        expect { subject.execute(build) }.to change { runner.ensure_runner_queue_value }
       end
     end
 
-    context 'when there are no runners that can pick build' do
+    context 'when there is no runner that can pick build' do
       it 'does not tick runner queue value' do
-        expect { subject.execute(build) }
-          .not_to change { runner.ensure_runner_queue_value }
+        expect { subject.execute(build) }.not_to change { runner.ensure_runner_queue_value }
       end
     end
   end
@@ -30,21 +28,61 @@ describe Ci::UpdateBuildQueueService do
   context 'when updating shared runners' do
     let(:runner) { create(:ci_runner, :shared) }
 
-    context 'when there are runner that can pick build' do
+    context 'when there is no runner that can pick build' do
       it 'ticks runner queue value' do
-        expect { subject.execute(build) }
-          .to change { runner.ensure_runner_queue_value }
+        expect { subject.execute(build) }.to change { runner.ensure_runner_queue_value }
       end
     end
 
-    context 'when there are no runners that can pick build' do
+    context 'when there is no runner that can pick build due to tag mismatch' do
       before do
         build.tag_list = [:docker]
       end
 
       it 'does not tick runner queue value' do
-        expect { subject.execute(build) }
-          .not_to change { runner.ensure_runner_queue_value }
+        expect { subject.execute(build) }.not_to change { runner.ensure_runner_queue_value }
+      end
+    end
+
+    context 'when there is no runner that can pick build due to being disabled on project' do
+      before do
+        build.project.shared_runners_enabled = false
+      end
+
+      it 'does not tick runner queue value' do
+        expect { subject.execute(build) }.not_to change { runner.ensure_runner_queue_value }
+      end
+    end
+  end
+
+  context 'when updating group runners' do
+    let(:group) { create :group }
+    let(:project) { create :project, group: group }
+    let(:runner) { create :ci_runner, groups: [group] }
+
+    context 'when there is a runner that can pick build' do
+      it 'ticks runner queue value' do
+        expect { subject.execute(build) }.to change { runner.ensure_runner_queue_value }
+      end
+    end
+
+    context 'when there is no runner that can pick build due to tag mismatch' do
+      before do
+        build.tag_list = [:docker]
+      end
+
+      it 'does not tick runner queue value' do
+        expect { subject.execute(build) }.not_to change { runner.ensure_runner_queue_value }
+      end
+    end
+
+    context 'when there is no runner that can pick build due to being disabled on project' do
+      before do
+        build.project.group_runners_enabled = false
+      end
+
+      it 'does not tick runner queue value' do
+        expect { subject.execute(build) }.not_to change { runner.ensure_runner_queue_value }
       end
     end
   end