Improve config source handling code

app/models/ci/build.rb

@@ -217,6 +217,7 @@ module Ci
       variables += runner.predefined_variables if runner
       variables += project.container_registry_variables
       variables += project.deployment_variables if has_environment?
+      variables += project.auto_devops_variables
       variables += yaml_variables
       variables += user_variables
       variables += project.group.secret_variables_for(ref, project).map(&:to_runner_variable) if project.group

app/models/ci/pipeline.rb

@@ -325,15 +325,11 @@ module Ci
     end
 
     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
+      if ci_yaml_from_repo
+        self.config_source = :repository_source
+      elsif implied_ci_yaml_file
+        self.config_source = :auto_devops_source
+      end
     end
 
     def config_processor
@@ -461,12 +457,17 @@ module Ci
     private
 
     def ci_yaml_from_repo
+      return unless project
+      return unless sha
+
       project.repository.gitlab_ci_yml_for(sha, ci_yaml_file_path)
     rescue GRPC::NotFound, Rugged::ReferenceError, GRPC::Internal
       nil
     end
 
     def implied_ci_yaml_file
+      return unless project
+
       if project.auto_devops_enabled?
         Gitlab::Template::GitlabCiYmlTemplate.find('Auto-DevOps').content
       end

app/models/project.rb

@@ -1390,7 +1390,7 @@ 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 },
@@ -1398,12 +1398,6 @@ class Project < ActiveRecord::Base
       { key: 'CI_PROJECT_NAMESPACE', value: namespace.full_path, 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
@@ -1440,6 +1434,12 @@ class Project < ActiveRecord::Base
     deployment_service.predefined_variables
   end
 
+  def auto_devops_variables
+    return [] unless auto_devops_enabled?
+
+    auto_devops&.variables || []
+  end
+
   def append_or_update_attribute(name, value)
     old_values = public_send(name.to_s) # rubocop:disable GitlabSecurity/PublicSend
 

app/models/project_auto_devops.rb

@@ -2,4 +2,10 @@ class ProjectAutoDevops < ActiveRecord::Base
   belongs_to :project
 
   validates :domain, presence: true, hostname: { allow_numeric_hostname: true }, if: :enabled?
+
+  def variables
+    variables = []
+    variables << { key: 'AUTO_DEVOPS_DOMAIN', value: domain, public: true } if domain.present?
+    variables
+  end
 end

spec/models/ci/pipeline_spec.rb

@@ -832,10 +832,10 @@ describe Ci::Pipeline, :mailer do
   describe '#ci_yaml_file' do
     let(:implied_yml) { Gitlab::Template::GitlabCiYmlTemplate.find('Auto-DevOps').content }
 
-    before { pipeline.detect_ci_yaml_file }
-
     context 'the source is unknown' do
-      before { pipeline.unknown_source! }
+      before do
+        pipeline.unknown_source!
+      end
 
       it 'returns the configuration if found' do
         allow(pipeline.project.repository).to receive(:gitlab_ci_yml_for)
@@ -854,7 +854,9 @@ describe Ci::Pipeline, :mailer do
     end
 
     context 'the source is the repository' do
-      before { pipeline.repository_source! }
+      before do
+        pipeline.repository_source!
+      end
 
       it 'returns the configuration if found' do
         allow(pipeline.project.repository).to receive(:gitlab_ci_yml_for)
@@ -867,7 +869,9 @@ describe Ci::Pipeline, :mailer do
     end
 
     context 'when the source is auto_devops_source' do
-      before { pipeline.auto_devops_source! }
+      before do
+        pipeline.auto_devops_source!
+      end
 
       it 'finds the implied config' do
         allow_any_instance_of(ApplicationSetting)