Add ContainerExpirationPolicy model and table

Migration to create container_expiration_policies
Add model with associations to project
Add helpers to provide drop down options for
container_expiration_policies
Autopopulate container_expiration_policy record
on project create

app/helpers/container_expiration_policies_helper.rb

+# frozen_string_literal: true
+
+module ContainerExpirationPoliciesHelper
+  def cadence_options
+    ContainerExpirationPolicy.cadence_options.map do |key, val|
+      { key: key.to_s, label: val }
+    end
+  end
+
+  def keep_n_options
+    ContainerExpirationPolicy.keep_n_options.map do |key, val|
+      { key: key, label: val }
+    end
+  end
+
+  def older_than_options
+    ContainerExpirationPolicy.older_than_options.map do |key, val|
+      { key: key.to_s, label: val }
+    end
+  end
+end

app/models/container_expiration_policy.rb

+# frozen_string_literal: true
+
+class ContainerExpirationPolicy < ApplicationRecord
+  belongs_to :project, inverse_of: :container_expiration_policy
+
+  validates :project, presence: true
+  validates :enabled, inclusion: { in: [true, false] }
+  validates :cadence, presence: true, inclusion: { in: ->(_) { self.cadence_options.stringify_keys } }
+  validates :older_than, inclusion: { in: ->(_) { self.older_than_options.stringify_keys } }, allow_nil: true
+  validates :keep_n, inclusion: { in: ->(_) { self.keep_n_options.keys } }, allow_nil: true
+
+  def self.keep_n_options
+    {
+      1 => _('%{tags} tag per image name') % { tags: 1 },
+      5 => _('%{tags} tags per image name') % { tags: 5 },
+      10 => _('%{tags} tags per image name') % { tags: 10 },
+      25 => _('%{tags} tags per image name') % { tags: 25 },
+      50 => _('%{tags} tags per image name') % { tags: 50 },
+      100 => _('%{tags} tags per image name') % { tags: 100 }
+    }
+  end
+
+  def self.cadence_options
+    {
+      '1d': _('Every day'),
+      '7d': _('Every week'),
+      '14d': _('Every two weeks'),
+      '1month': _('Every month'),
+      '3month': _('Every three months')
+    }
+  end
+
+  def self.older_than_options
+    {
+      '7d': _('%{days} days until tags are automatically removed') % { days: 7 },
+      '14d': _('%{days} days until tags are automatically removed') % { days: 14 },
+      '30d': _('%{days} days until tags are automatically removed') % { days: 30 },
+      '90d': _('%{days} days until tags are automatically removed') % { days: 90 }
+    }
+  end
+end

app/models/project.rb

@@ -97,8 +97,11 @@ class Project < ApplicationRecord
     unless: :ci_cd_settings,
     if: proc { ProjectCiCdSetting.available? }
 
+  after_create :create_container_expiration_policy,
+               unless: :container_expiration_policy
+
   after_create :create_pages_metadatum,
-    unless: :pages_metadatum
+               unless: :pages_metadatum
 
   after_create :set_timestamps_for_create
   after_update :update_forks_visibility_level
@@ -248,6 +251,7 @@ class Project < ApplicationRecord
   # which is not managed by the DB. Hence we're still using dependent: :destroy
   # here.
   has_many :container_repositories, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
+  has_one :container_expiration_policy, inverse_of: :project
 
   has_many :commit_statuses
   # The relation :all_pipelines is intended to be used when we want to get the
@@ -305,6 +309,7 @@ class Project < ApplicationRecord
   accepts_nested_attributes_for :import_data
   accepts_nested_attributes_for :auto_devops, update_only: true
   accepts_nested_attributes_for :ci_cd_settings, update_only: true
+  accepts_nested_attributes_for :container_expiration_policy, update_only: true
 
   accepts_nested_attributes_for :remote_mirrors,
                                 allow_destroy: true,

changelogs/unreleased/15398-mvc-container-registry-tag-expiration-policies.yml

+---
+title: Create container expiration policies for projects
+merge_request: 20412
+author:
+type: added

db/migrate/20191119231621_create_container_expiration_policies.rb

+# frozen_string_literal: true
+
+class CreateContainerExpirationPolicies < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def change
+    create_table :container_expiration_policies, id: false, primary_key: :project_id do |t|
+      t.timestamps_with_timezone null: false
+      t.datetime_with_timezone :next_run_at
+      t.references :project, primary_key: true, default: nil, index: false, foreign_key: { on_delete: :cascade }
+      t.string :name_regex, limit: 255
+      t.string :cadence, null: false, limit: 12, default: '7d'
+      t.string :older_than, limit: 12
+      t.integer :keep_n
+      t.boolean :enabled, null: false, default: false
+    end
+
+    add_index :container_expiration_policies, [:next_run_at, :enabled],
+              name: 'index_container_expiration_policies_on_next_run_at_and_enabled'
+  end
+end

db/schema.rb

@@ -1224,6 +1224,18 @@ ActiveRecord::Schema.define(version: 2019_12_06_122926) do
     t.index ["note_id"], name: "index_commit_user_mentions_on_note_id", unique: true
   end
 
+  create_table "container_expiration_policies", primary_key: "project_id", id: :bigint, default: nil, force: :cascade do |t|
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
+    t.datetime_with_timezone "next_run_at"
+    t.string "name_regex", limit: 255
+    t.string "cadence", limit: 12, default: "7d", null: false
+    t.string "older_than", limit: 12
+    t.integer "keep_n"
+    t.boolean "enabled", default: false, null: false
+    t.index ["next_run_at", "enabled"], name: "index_container_expiration_policies_on_next_run_at_and_enabled"
+  end
+
   create_table "container_repositories", id: :serial, force: :cascade do |t|
     t.integer "project_id", null: false
     t.string "name", null: false
@@ -4410,6 +4422,7 @@ ActiveRecord::Schema.define(version: 2019_12_06_122926) do
   add_foreign_key "clusters_kubernetes_namespaces", "environments", on_delete: :nullify
   add_foreign_key "clusters_kubernetes_namespaces", "projects", on_delete: :nullify
   add_foreign_key "commit_user_mentions", "notes", on_delete: :cascade
+  add_foreign_key "container_expiration_policies", "projects", on_delete: :cascade
   add_foreign_key "container_repositories", "projects"
   add_foreign_key "dependency_proxy_blobs", "namespaces", column: "group_id", on_delete: :cascade
   add_foreign_key "dependency_proxy_group_settings", "namespaces", column: "group_id", on_delete: :cascade

lib/gitlab/import_export/import_export.yml

@@ -73,6 +73,7 @@ tree:
     - :auto_devops
     - :triggers
     - :pipeline_schedules
+    - :container_expiration_policy
     - :services
     - protected_branches:
       - :merge_access_levels

locale/gitlab.pot

@@ -234,6 +234,9 @@ msgstr[1] ""
 msgid "%{count} related %{pluralized_subject}: %{links}"
 msgstr ""
 
+msgid "%{days} days until tags are automatically removed"
+msgstr ""
+
 msgid "%{description}- Sentry event: %{errorUrl}- First seen: %{firstSeen}- Last seen: %{lastSeen} %{countLabel}: %{count}%{userCountLabel}: %{userCount}"
 msgstr ""
 
@@ -380,6 +383,12 @@ msgstr[1] ""
 msgid "%{tabname} changed"
 msgstr ""
 
+msgid "%{tags} tag per image name"
+msgstr ""
+
+msgid "%{tags} tags per image name"
+msgstr ""
+
 msgid "%{tag}-evidence.json"
 msgstr ""
 
@@ -7056,12 +7065,27 @@ msgstr ""
 msgid "Every %{action} attempt has failed: %{job_error_message}. Please try again."
 msgstr ""
 
+msgid "Every day"
+msgstr ""
+
 msgid "Every day (at 4:00am)"
 msgstr ""
 
+msgid "Every month"
+msgstr ""
+
 msgid "Every month (on the 1st at 4:00am)"
 msgstr ""
 
+msgid "Every three months"
+msgstr ""
+
+msgid "Every two weeks"
+msgstr ""
+
+msgid "Every week"
+msgstr ""
+
 msgid "Every week (Sundays at 4:00am)"
 msgstr ""
 

spec/helpers/container_expiration_policies_helper_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ContainerExpirationPoliciesHelper do
+  describe '#keep_n_options' do
+    it 'returns keep_n options formatted for dropdown usage' do
+      expected_result = [
+        { key: 1, label: '1 tag per image name' },
+        { key: 5, label: '5 tags per image name' },
+        { key: 10, label: '10 tags per image name' },
+        { key: 25, label: '25 tags per image name' },
+        { key: 50, label: '50 tags per image name' },
+        { key: 100, label: '100 tags per image name' }
+      ]
+
+      expect(helper.keep_n_options).to eq(expected_result)
+    end
+  end
+
+  describe '#cadence_options' do
+    it 'returns cadence options formatted for dropdown usage' do
+      expected_result = [
+        { key: '1d', label: 'Every day' },
+        { key: '7d', label: 'Every week' },
+        { key: '14d', label: 'Every two weeks' },
+        { key: '1month', label: 'Every month' },
+        { key: '3month', label: 'Every three months' }
+      ]
+
+      expect(helper.cadence_options).to eq(expected_result)
+    end
+  end
+
+  describe '#older_than_options' do
+    it 'returns older_than options formatted for dropdown usage' do
+      expected_result = [
+        { key: '7d', label: '7 days until tags are automatically removed' },
+        { key: '14d', label: '14 days until tags are automatically removed' },
+        { key: '30d', label: '30 days until tags are automatically removed' },
+        { key: '90d', label: '90 days until tags are automatically removed' }
+      ]
+
+      expect(helper.older_than_options).to eq(expected_result)
+    end
+  end
+end

spec/lib/gitlab/import_export/all_models.yml

@@ -443,6 +443,7 @@ project:
 - downstream_project_subscriptions
 - service_desk_setting
 - import_failures
+- container_expiration_policy
 award_emoji:
 - awardable
 - user

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -773,3 +773,13 @@ ZoomMeeting:
 ServiceDeskSetting:
 - project_id
 - issue_template_key
+ContainerExpirationPolicy:
+- created_at
+- updated_at
+- next_run_at
+- project_id
+- name_regex
+- cadence
+- older_than
+- keep_n
+- enabled

spec/models/container_expiration_policy_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ContainerExpirationPolicy, type: :model do
+  describe 'relationships' do
+    it { is_expected.to belong_to(:project) }
+  end
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:project) }
+
+    describe '#enabled' do
+      it { is_expected.to allow_value(true).for(:enabled) }
+      it { is_expected.to allow_value(false).for(:enabled) }
+      it { is_expected.not_to allow_value(nil).for(:enabled) }
+    end
+
+    describe '#cadence' do
+      it { is_expected.to validate_presence_of(:cadence) }
+
+      it { is_expected.to allow_value('1d').for(:cadence) }
+      it { is_expected.to allow_value('1month').for(:cadence) }
+      it { is_expected.not_to allow_value('123asdf').for(:cadence) }
+      it { is_expected.not_to allow_value(nil).for(:cadence) }
+    end
+
+    describe '#older_than' do
+      it { is_expected.to allow_value('7d').for(:older_than) }
+      it { is_expected.to allow_value('14d').for(:older_than) }
+      it { is_expected.to allow_value(nil).for(:older_than) }
+      it { is_expected.not_to allow_value('123asdf').for(:older_than) }
+    end
+
+    describe '#keep_n' do
+      it { is_expected.to allow_value(10).for(:keep_n) }
+      it { is_expected.to allow_value(nil).for(:keep_n) }
+      it { is_expected.not_to allow_value('foo').for(:keep_n) }
+    end
+  end
+end

spec/models/project_spec.rb

@@ -62,6 +62,7 @@ describe Project do
     it { is_expected.to have_one(:external_wiki_service) }
     it { is_expected.to have_one(:project_feature) }
     it { is_expected.to have_one(:project_repository) }
+    it { is_expected.to have_one(:container_expiration_policy) }
     it { is_expected.to have_one(:statistics).class_name('ProjectStatistics') }
     it { is_expected.to have_one(:import_data).class_name('ProjectImportData') }
     it { is_expected.to have_one(:last_event).class_name('Event') }
@@ -137,6 +138,13 @@ describe Project do
         expect(project.ci_cd_settings).to be_persisted
       end
 
+      it 'automatically creates a container expiration policy row' do
+        project = create(:project)
+
+        expect(project.container_expiration_policy).to be_an_instance_of(ContainerExpirationPolicy)
+        expect(project.container_expiration_policy).to be_persisted
+      end
+
       it 'automatically creates a Pages metadata row' do
         project = create(:project)