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/20180713092803_create_user_statuses.rb

@@ -6,6 +6,7 @@ class CreateUserStatuses < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :user_statuses, id: false, primary_key: :user_id do |t|
       t.references :user,
                    foreign_key: { on_delete: :cascade },
@@ -16,5 +17,6 @@ def change
       t.string :message, limit: 100
       t.string :message_html
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180814153625_add_commit_email_to_users.rb

@@ -28,6 +28,6 @@ class AddCommitEmailToUsers < ActiveRecord::Migration[4.2]
   # disable_ddl_transaction!
 
   def change
-    add_column :users, :commit_email, :string
+    add_column :users, :commit_email, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180831164908_add_identifier_to_prometheus_metric.rb

@@ -6,6 +6,6 @@ class AddIdentifierToPrometheusMetric < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :prometheus_metrics, :identifier, :string
+    add_column :prometheus_metrics, :identifier, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180910115836_add_attr_encrypted_columns_to_web_hook.rb

@@ -6,10 +6,12 @@ class AddAttrEncryptedColumnsToWebHook < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column :web_hooks, :encrypted_token, :string
     add_column :web_hooks, :encrypted_token_iv, :string
 
     add_column :web_hooks, :encrypted_url, :string
     add_column :web_hooks, :encrypted_url_iv, :string
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180910153412_add_token_digest_to_personal_access_tokens.rb

@@ -8,7 +8,7 @@ class AddTokenDigestToPersonalAccessTokens < ActiveRecord::Migration[4.2]
   def up
     change_column :personal_access_tokens, :token, :string, null: true
 
-    add_column :personal_access_tokens, :token_digest, :string
+    add_column :personal_access_tokens, :token_digest, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 
   def down

db/migrate/20180912111628_add_knative_application.rb

@@ -6,6 +6,7 @@ class AddKnativeApplication < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table "clusters_applications_knative" do |t|
       t.references :cluster, null: false, unique: true, foreign_key: { on_delete: :cascade }
 
@@ -16,5 +17,6 @@ def change
       t.string "hostname"
       t.text "status_reason"
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181009190428_create_clusters_kubernetes_namespaces.rb

@@ -5,6 +5,7 @@ class CreateClustersKubernetesNamespaces < ActiveRecord::Migration[4.2]
   INDEX_NAME = 'kubernetes_namespaces_cluster_and_namespace'
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :clusters_kubernetes_namespaces, id: :bigserial do |t|
       t.references :cluster, null: false, index: true, foreign_key: { on_delete: :cascade }
       t.references :project, index: true, foreign_key: { on_delete: :nullify }
@@ -20,5 +21,6 @@ def change
 
       t.index [:cluster_id, :namespace], name: INDEX_NAME, unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181019032400_add_shards_table.rb

@@ -5,7 +5,7 @@ class AddShardsTable < ActiveRecord::Migration[4.2]
 
   def change
     create_table :shards do |t|
-      t.string :name, null: false, index: { unique: true }
+      t.string :name, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
     end
   end
 end

db/migrate/20181019032408_add_repositories_table.rb

@@ -6,7 +6,7 @@ class AddRepositoriesTable < ActiveRecord::Migration[4.2]
   def change
     create_table :repositories, id: :bigserial do |t|
       t.references :shard, null: false, index: true, foreign_key: { on_delete: :restrict }
-      t.string :disk_path, null: false, index: { unique: true }
+      t.string :disk_path, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
     end
 
     add_column :projects, :pool_repository_id, :bigint

db/migrate/20181025115728_add_private_commit_email_hostname_to_application_settings.rb

@@ -6,6 +6,6 @@ class AddPrivateCommitEmailHostnameToApplicationSettings < ActiveRecord::Migrati
   DOWNTIME = false
 
   def change
-    add_column(:application_settings, :commit_email_hostname, :string, null: true)
+    add_column(:application_settings, :commit_email_hostname, :string, null: true) # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181031190559_drop_gcp_clusters_table.rb

@@ -10,6 +10,7 @@ def up
   end
 
   def down
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :gcp_clusters do |t|
       # Order columns by best align scheme
       t.references :project, null: false, index: { unique: true }, foreign_key: { on_delete: :cascade }
@@ -49,5 +50,6 @@ def down
       t.text :encrypted_gcp_token
       t.string :encrypted_gcp_token_iv
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181101191341_create_clusters_applications_cert_manager.rb

@@ -6,6 +6,7 @@ class CreateClustersApplicationsCertManager < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :clusters_applications_cert_managers do |t|
       t.references :cluster, null: false, index: false, foreign_key: { on_delete: :cascade }
       t.integer :status, null: false
@@ -15,5 +16,6 @@ def change
       t.text :status_reason
       t.index :cluster_id, unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181115140140_add_encrypted_runners_token_to_settings.rb

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

db/migrate/20181116050532_knative_external_ip.rb

@@ -9,6 +9,6 @@ class KnativeExternalIp < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :clusters_applications_knative, :external_ip, :string
+    add_column :clusters_applications_knative, :external_ip, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181116141415_add_encrypted_runners_token_to_namespaces.rb

@@ -6,6 +6,6 @@ class AddEncryptedRunnersTokenToNamespaces < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :namespaces, :runners_token_encrypted, :string
+    add_column :namespaces, :runners_token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181116141504_add_encrypted_runners_token_to_projects.rb

@@ -6,6 +6,6 @@ class AddEncryptedRunnersTokenToProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :projects, :runners_token_encrypted, :string
+    add_column :projects, :runners_token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181120151656_add_token_encrypted_to_ci_runners.rb

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

db/migrate/20181122160027_create_project_repositories.rb

@@ -11,7 +11,7 @@ class CreateProjectRepositories < ActiveRecord::Migration[5.0]
   def change
     create_table :project_repositories, id: :bigserial do |t|
       t.references :shard, null: false, index: true, foreign_key: { on_delete: :restrict }
-      t.string :disk_path, null: false, index: { unique: true }
+      t.string :disk_path, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
       t.references :project, null: false, index: { unique: true }, foreign_key: { on_delete: :cascade }
     end
   end

db/migrate/20181123144235_create_suggestions.rb

@@ -8,7 +8,7 @@ def change
       t.references :note, foreign_key: { on_delete: :cascade }, null: false
       t.integer :relative_order, null: false, limit: 2
       t.boolean :applied, null: false, default: false
-      t.string :commit_id
+      t.string :commit_id # rubocop:disable Migration/AddLimitToStringColumns
       t.text :from_content, null: false
       t.text :to_content, null: false
 

db/migrate/20181128123704_add_state_to_pool_repository.rb

@@ -9,7 +9,7 @@ class AddStateToPoolRepository < ActiveRecord::Migration[5.0]
   # the transactions don't have to be disabled
   # rubocop: disable Migration/AddConcurrentForeignKey, Migration/AddIndex
   def change
-    add_column(:pool_repositories, :state, :string, null: true)
+    add_column(:pool_repositories, :state, :string, null: true) # rubocop:disable Migration/AddLimitToStringColumns
 
     add_column :pool_repositories, :source_project_id, :integer
     add_index :pool_repositories, :source_project_id, unique: true