Add name_regex_keep to ContainerExpirationPolicy

Add new column to container_expiration_policies to
specify tags to retain within a policy.

changelogs/unreleased/207267-retain-image-policy.yml

+---
+title: Add name_regex_keep to container_expiration_policies
+merge_request: 29618
+author:
+type: added

db/migrate/20200415192656_add_name_regex_keep_to_container_expiration_policies.rb

+# frozen_string_literal: true
+
+class AddNameRegexKeepToContainerExpirationPolicies < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  CONSTRAINT_NAME = 'container_expiration_policies_name_regex_keep'
+
+  def up
+    add_column(:container_expiration_policies, :name_regex_keep, :text)
+    add_text_limit(:container_expiration_policies, :name_regex_keep, 255, constraint_name: CONSTRAINT_NAME)
+  end
+
+  def down
+    remove_check_constraint(:container_expiration_policies, CONSTRAINT_NAME)
+    remove_column(:container_expiration_policies, :name_regex_keep)
+  end
+end

db/structure.sql

@@ -1867,7 +1867,9 @@ CREATE TABLE public.container_expiration_policies (
     cadence character varying(12) DEFAULT '7d'::character varying NOT NULL,
     older_than character varying(12),
     keep_n integer,
-    enabled boolean DEFAULT true NOT NULL
+    enabled boolean DEFAULT true NOT NULL,
+    name_regex_keep text,
+    CONSTRAINT container_expiration_policies_name_regex_keep CHECK ((char_length(name_regex_keep) <= 255))
 );
 
 CREATE TABLE public.container_repositories (
@@ -13188,5 +13190,6 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200415160722
 20200415161021
 20200415161206
+20200415192656
 \.
 

lib/api/entities/container_expiration_policy.rb

@@ -8,6 +8,7 @@ module API
       expose :keep_n
       expose :older_than
       expose :name_regex
+      expose :name_regex_keep
       expose :next_run_at
     end
   end

lib/api/helpers/projects_helpers.rb

@@ -85,6 +85,7 @@ module API
         optional :keep_n, type: String, desc: 'Container expiration policy number of images to keep'
         optional :older_than, type: String, desc: 'Container expiration policy remove images older than value'
         optional :name_regex, type: String, desc: 'Container expiration policy regex for image removal'
+        optional :name_regex_keep, type: String, desc: 'Container expiration policy regex for image retention'
         optional :enabled, type: Boolean, desc: 'Flag indication if container expiration policy is enabled'
       end
 

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -812,6 +812,7 @@ ContainerExpirationPolicy:
 - next_run_at
 - project_id
 - name_regex
+- name_regex_keep
 - cadence
 - older_than
 - keep_n

spec/requests/api/projects_spec.rb

@@ -2414,7 +2414,8 @@ describe API::Projects do
         project_param = {
           container_expiration_policy_attributes: {
             cadence: '1month',
-            keep_n: 1
+            keep_n: 1,
+            name_regex_keep: 'foo.*'
           }
         }
 
@@ -2424,6 +2425,7 @@ describe API::Projects do
 
         expect(json_response['container_expiration_policy']['cadence']).to eq('1month')
         expect(json_response['container_expiration_policy']['keep_n']).to eq(1)
+        expect(json_response['container_expiration_policy']['name_regex_keep']).to eq('foo.*')
       end
     end