Adds cop to enforce string limits on migrations

This cop will analyze migrations that add columns with string, and
report an offense if the string has no limit enforced

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/64505

db/migrate/20171230123729_init_schema.rb

@@ -5,6 +5,7 @@
 # rubocop:disable Metrics/AbcSize
 # rubocop:disable Migration/AddConcurrentForeignKey
 # rubocop:disable Style/WordArray
+# rubocop:disable Migration/AddLimitToStringColumns
 class InitSchema < ActiveRecord::Migration[4.2]
   DOWNTIME = false
@@ -1852,3 +1853,4 @@ class InitSchema < ActiveRecord::Migration[4.2]
     raise ActiveRecord::IrreversibleMigration, "The initial migration is not revertable"
   end
 end
+# rubocop:enable Migration/AddLimitToStringColumns

db/migrate/20180101160629_create_prometheus_metrics.rb

@@ -4,6 +4,7 @@ class CreatePrometheusMetrics < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :prometheus_metrics do |t|
       t.references :project, index: true, foreign_key: { on_delete: :cascade }, null: false
       t.string :title, null: false
@@ -14,5 +15,6 @@ class CreatePrometheusMetrics < ActiveRecord::Migration[4.2]
       t.integer :group, null: false, index: true
       t.timestamps_with_timezone null: false
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180122162010_add_auto_devops_domain_to_application_settings.rb

@@ -8,6 +8,6 @@ class AddAutoDevopsDomainToApplicationSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
-    add_column :application_settings, :auto_devops_domain, :string
+    add_column :application_settings, :auto_devops_domain, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180129193323_add_uploads_builder_context.rb

@@ -8,7 +8,9 @@ class AddUploadsBuilderContext < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column :uploads, :mount_point, :string
     add_column :uploads, :secret, :string
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180212030105_add_external_ip_to_clusters_applications_ingress.rb

@@ -4,6 +4,6 @@ class AddExternalIpToClustersApplicationsIngress < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
-    add_column :clusters_applications_ingress, :external_ip, :string
+    add_column :clusters_applications_ingress, :external_ip, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180214093516_create_badges.rb

@@ -2,6 +2,7 @@ class CreateBadges < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :badges do |t|
       t.string     :link_url, null: false
       t.string     :image_url, null: false
@@ -11,6 +12,7 @@ class CreateBadges < ActiveRecord::Migration[4.2]
       t.timestamps_with_timezone null: false
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
     # rubocop:disable Migration/AddConcurrentForeignKey
     add_foreign_key :badges, :namespaces, column: :group_id, on_delete: :cascade

db/migrate/20180214155405_create_clusters_applications_runners.rb

@@ -13,7 +13,7 @@ class CreateClustersApplicationsRunners < ActiveRecord::Migration[4.2]
       t.index :cluster_id, unique: true
       t.integer :status, null: false
       t.timestamps_with_timezone null: false
-      t.string :version, null: false
+      t.string :version, null: false # rubocop:disable Migration/AddLimitToStringColumns
       t.text :status_reason
     end

db/migrate/20180216120000_add_pages_domain_verification.rb

@@ -3,6 +3,6 @@ class AddPagesDomainVerification < ActiveRecord::Migration[4.2]
   def change
     add_column :pages_domains, :verified_at, :datetime_with_timezone
-    add_column :pages_domains, :verification_code, :string
+    add_column :pages_domains, :verification_code, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180222043024_add_ip_address_to_runner.rb

@@ -4,6 +4,6 @@ class AddIpAddressToRunner < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
-    add_column :ci_runners, :ip_address, :string
+    add_column :ci_runners, :ip_address, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180308125206_add_user_internal_regex_to_application_setting.rb

@@ -4,7 +4,7 @@ class AddUserInternalRegexToApplicationSetting < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def up
-    add_column :application_settings, :user_default_internal_regex, :string, null: true
+    add_column :application_settings, :user_default_internal_regex, :string, null: true # rubocop:disable Migration/AddLimitToStringColumns
   end
   def down

db/migrate/20180315160435_add_external_auth_mutual_tls_fields_to_project_settings.rb

@@ -2,6 +2,7 @@ class AddExternalAuthMutualTlsFieldsToProjectSettings < ActiveRecord::Migration[
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column :application_settings,
                :external_auth_client_cert, :text
     add_column :application_settings,
@@ -12,5 +13,6 @@ class AddExternalAuthMutualTlsFieldsToProjectSettings < ActiveRecord::Migration[
                :encrypted_external_auth_client_key_pass, :string
     add_column :application_settings,
                :encrypted_external_auth_client_key_pass_iv, :string
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180319190020_create_deploy_tokens.rb

@@ -2,6 +2,7 @@ class CreateDeployTokens < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :deploy_tokens do |t|
       t.boolean :revoked, default: false
       t.boolean :read_repository, null: false, default: false
@@ -15,5 +16,6 @@ class CreateDeployTokens < ActiveRecord::Migration[4.2]
       t.index [:token, :expires_at, :id], where: "(revoked IS FALSE)"
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180502122856_create_project_mirror_data.rb

@@ -3,6 +3,7 @@ class CreateProjectMirrorData < ActiveRecord::Migration[4.2]
   DOWNTIME = false
+  # rubocop:disable Migration/AddLimitToStringColumns
   def up
     if table_exists?(:project_mirror_data)
       add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status)
@@ -17,6 +18,7 @@ class CreateProjectMirrorData < ActiveRecord::Migration[4.2]
       end
     end
   end
+  # rubocop:enable Migration/AddLimitToStringColumns
   def down
     remove_column :project_mirror_data, :status

db/migrate/20180503131624_create_remote_mirrors.rb

@@ -5,6 +5,7 @@ class CreateRemoteMirrors < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
+  # rubocop:disable Migration/AddLimitToStringColumns
   def up
     return if table_exists?(:remote_mirrors)
@@ -27,6 +28,7 @@ class CreateRemoteMirrors < ActiveRecord::Migration[4.2]
       t.timestamps null: false
     end
   end
+  # rubocop:enable Migration/AddLimitToStringColumns
   def down
     # ee/db/migrate/20160321161032_create_remote_mirrors_ee.rb will remove the table

db/migrate/20180503175053_ensure_missing_columns_to_project_mirror_data.rb

@@ -4,8 +4,8 @@ class EnsureMissingColumnsToProjectMirrorData < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def up
-    add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status)
-    add_column :project_mirror_data, :jid, :string unless column_exists?(:project_mirror_data, :jid)
+    add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status) # rubocop:disable Migration/AddLimitToStringColumns
+    add_column :project_mirror_data, :jid, :string unless column_exists?(:project_mirror_data, :jid) # rubocop:disable Migration/AddLimitToStringColumns
     add_column :project_mirror_data, :last_error, :text unless column_exists?(:project_mirror_data, :last_error)
   end

db/migrate/20180511131058_create_clusters_applications_jupyter.rb

@@ -7,17 +7,19 @@ class CreateClustersApplicationsJupyter < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :clusters_applications_jupyter do |t|
       t.references :cluster, null: false, unique: true, foreign_key: { on_delete: :cascade }
       t.references :oauth_application, foreign_key: { on_delete: :nullify }
       t.integer :status, null: false
-      t.string :version, null: false
-      t.string :hostname
+      t.string :version, null: false # rubocop:disable Migration/AddLimitToStringColumns
+      t.string :hostname # rubocop:disable Migration/AddLimitToStringColumns
       t.timestamps_with_timezone null: false
       t.text :status_reason
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180515121227_create_notes_diff_files.rb

@@ -4,6 +4,7 @@ class CreateNotesDiffFiles < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :note_diff_files do |t|
       t.references :diff_note, references: :notes, null: false, index: { unique: true }
       t.text :diff, null: false
@@ -18,5 +19,6 @@ class CreateNotesDiffFiles < ActiveRecord::Migration[4.2]
     # rubocop:disable Migration/AddConcurrentForeignKey
     add_foreign_key :note_diff_files, :notes, column: :diff_note_id, on_delete: :cascade
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180529093006_ensure_remote_mirror_columns.rb

@@ -8,7 +8,7 @@ class EnsureRemoteMirrorColumns < ActiveRecord::Migration[4.2]
   def up
     # rubocop:disable Migration/Datetime
     add_column :remote_mirrors, :last_update_started_at, :datetime unless column_exists?(:remote_mirrors, :last_update_started_at)
-    add_column :remote_mirrors, :remote_name, :string unless column_exists?(:remote_mirrors, :remote_name)
+    add_column :remote_mirrors, :remote_name, :string unless column_exists?(:remote_mirrors, :remote_name) # rubocop:disable Migration/AddLimitToStringColumns
     unless column_exists?(:remote_mirrors, :only_protected_branches)
       add_column_with_default(:remote_mirrors,

db/migrate/20180531185349_add_repository_languages.rb

@@ -4,6 +4,7 @@ class AddRepositoryLanguages < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def up
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table(:programming_languages) do |t|
       t.string :name, null: false
       t.string :color, null: false
@@ -19,6 +20,7 @@ class AddRepositoryLanguages < ActiveRecord::Migration[4.2]
     add_index :programming_languages, :name, unique: true
     add_index :repository_languages, [:project_id, :programming_language_id],
       unique: true, name: "index_repository_languages_on_project_and_languages_id"
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
   def down

db/migrate/20180613081317_create_ci_builds_runner_session.rb

@@ -8,6 +8,7 @@ class CreateCiBuildsRunnerSession < ActiveRecord::Migration[4.2]
   DOWNTIME = false
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :ci_builds_runner_session, id: :bigserial do |t|
       t.integer :build_id, null: false
       t.string :url, null: false
@@ -17,5 +18,6 @@ class CreateCiBuildsRunnerSession < ActiveRecord::Migration[4.2]
       t.foreign_key :ci_builds, column: :build_id, on_delete: :cascade
       t.index :build_id, unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end