Use hook for setting Pipeline config_source

app/models/ci/pipeline.rb

@@ -38,6 +38,7 @@ module Ci
     validates :status, presence: { unless: :importing? }
     validate :valid_commit_sha, unless: :importing?
 
+    after_initialize :set_config_source, if: :new_record?
     after_create :keep_around_commits, unless: :importing?
 
     enum source: {
@@ -318,9 +319,16 @@ module Ci
       builds.latest.failed_but_allowed.any?
     end
 
-    def detect_ci_yaml_file
-      ci_yaml_from_repo&.tap { self.repository_source! } ||
-        implied_ci_yaml_file&.tap { self.auto_devops_source! }
+    def set_config_source
+      self.config_source =
+        if project
+          case
+          when ci_yaml_from_repo then :repository_source
+          when implied_ci_yaml_file then :auto_devops_source
+          end
+        else
+          :unknown_source
+        end
     end
 
     def config_processor
@@ -350,11 +358,10 @@ module Ci
       return @ci_yaml_file if defined?(@ci_yaml_file)
 
       @ci_yaml_file =
-        case config_source
-        when "repository_source", "unknown_source"
-          ci_yaml_from_repo
-        when "auto_devops_source"
+        if auto_devops_source?
           implied_ci_yaml_file
+        else
+          ci_yaml_from_repo
         end
 
       if @ci_yaml_file

app/models/project.rb

@@ -469,10 +469,10 @@ class Project < ActiveRecord::Base
   end
 
   def auto_devops_enabled?
-    if auto_devops && auto_devops.enabled.present?
-      auto_devops.enabled?
-    else
+    if auto_devops&.enabled.nil?
       current_application_settings.auto_devops_enabled?
+    else
+      auto_devops.enabled?
     end
   end
 
@@ -1389,15 +1389,20 @@ class Project < ActiveRecord::Base
   end
 
   def predefined_variables
-    [
+    variables = [
       { key: 'CI_PROJECT_ID', value: id.to_s, public: true },
       { key: 'CI_PROJECT_NAME', value: path, public: true },
       { key: 'CI_PROJECT_PATH', value: full_path, public: true },
       { key: 'CI_PROJECT_PATH_SLUG', value: full_path_slug, public: true },
       { key: 'CI_PROJECT_NAMESPACE', value: namespace.full_path, public: true },
-      { key: 'CI_PROJECT_URL', value: web_url, public: true },
-      { key: 'AUTO_DEVOPS_DOMAIN', value: auto_devops.domain, public: true }
+      { key: 'CI_PROJECT_URL', value: web_url, public: true }
     ]
+
+    if auto_devops_enabled? && auto_devops&.domain
+      variables << { key: 'AUTO_DEVOPS_DOMAIN', value: auto_devops.domain, public: true }
+    end
+
+    variables
   end
 
   def container_registry_variables

app/models/project_auto_devops.rb

 class ProjectAutoDevops < ActiveRecord::Base
   belongs_to :project
 
-  validates :domain, presence: true, if: :enabled?
+  validates :domain, presence: true, hostname: { allow_numeric_hostname: true }, if: :enabled?
 end

app/serializers/pipeline_entity.rb

@@ -16,7 +16,7 @@ class PipelineEntity < Grape::Entity
   expose :flags do
     expose :latest?, as: :latest
     expose :stuck?, as: :stuck
-    expose :auto_devops?, as: :auto_devops
+    expose :auto_devops_source?, as: :auto_devops
     expose :has_yaml_errors?, as: :yaml_errors
     expose :can_retry?, as: :retryable
     expose :can_cancel?, as: :cancelable

app/services/ci/create_pipeline_service.rb

@@ -67,11 +67,11 @@ module Ci
         return error('Commit not found')
       end
 
-      unless pipeline.detect_ci_yaml_file
+      unless pipeline.config_processor
+        unless pipeline.ci_yaml_file
           return error("Missing #{pipeline.ci_yaml_file_path} file")
         end
 
-      unless pipeline.config_processor
         return error(pipeline.yaml_errors, save: save_on_errors)
       end
 

spec/services/ci/create_pipeline_service_spec.rb

 require 'spec_helper'
 
 describe Ci::CreatePipelineService do
-  let(:project) { create(:project, :repository) }
+  set(:project) { create(:project, :repository) }
   let(:user) { create(:admin) }
   let(:ref_name) { 'refs/heads/master' }